Segfault in FFI::Struct#[] after GC.compact

[larskanis]

Original issue: cotag/http-parser#3 (comment)

I was able to trigger the segfault once with ffi-1.12.1. Unfortunately I didn't find a way to reproduce it reliably.

irb input and backtrace

lars@isa:~/comcard/ffi$  git:(master) 3M 12A irb -rirb -rpp -rffi
2.7.0 :001 > ^C
2.7.0 :001 > def new_settings
2.7.0 :002 >   settings = Class.new(FFI::Struct) do
2.7.0 :003 >     layout  :on_message_begin,    :ushort,
2.7.0 :004 >     :on_url,              :ushort,
2.7.0 :005 >     :on_status,           :ushort,
2.7.0 :006 >     :on_header_field,     :ushort,
2.7.0 :007 >     :on_header_value,     :ushort,
2.7.0 :008 >     :on_headers_complete, :ushort,
        2: from (irb):15:in `times'
        1: from (irb):15:in `block in irb_binding'
NameError (undefined local variable or method `a' for main:Object)
2.7.0 :017 > a=[]
2.7.0 :018 > 10000.times{ a<<"x".dup }; pp GC.verify_compaction_references[:moved]
{:T_NONE=>0,
 :T_OBJECT=>146,
 :T_CLASS=>184,
 :T_MODULE=>9,
 :T_FLOAT=>0,
 :T_STRING=>3912,
 :T_REGEXP=>50,
 :T_ARRAY=>473,
 :T_HASH=>36,
 :T_STRUCT=>5,
 :T_BIGNUM=>0,
 :T_FILE=>0,
 :T_DATA=>32,
 :T_MATCH=>0,
 :T_COMPLEX=>0,
 :T_RATIONAL=>0,
 16=>0,
 :T_NIL=>0,
 :T_TRUE=>0,
 :T_SYMBOL=>1,
 :T_UNDEF=>0,
 23=>0,
 24=>0,
 25=>0,
 :T_IMEMO=>2465,
 :T_NODE=>0,
 :T_ICLASS=>18,
 :T_ZOMBIE=>0,
 :T_MOVED=>0}
 => {:T_NONE=>0, :T_OBJECT=>146, :T_CLASS=>184, :T_MODULE=>9, :T_FLOAT=>0, :T_STRING=>3912, :T_REGEXP=>50, :T_ARRAY=>473, :T_HASH=>36, :T_STRUCT=>5, :T_BIGNUM=>0, :T_FILE=>0, :T_DATA=>32, :T_MATCH=>0, :T_COMPLEX=>0, :T_RATIONAL=>0, 16=>0, :T_NIL=>0, :T_TRUE=>0, :T_FALSE=>0, :T_SYMBOL=>1, :T_FIXNUM=>0, :T_UNDEF=>0, 23=>0, 24=>0, 25=>0, :T_IMEMO=>2465, :T_NODE=>0, :T_ICLASS=>18, :T_ZOMBIE=>0, :T_MOVED=>0}
2.7.0 :019 > s=new_settings.new
2.7.0 :020 > s[:on_body]
 => 0
2.7.0 :021 > 10000.times{ a<<"x".dup }; pp GC.verify_compaction_references[:moved]
{:T_NONE=>0,
 :T_OBJECT=>249,
 :T_CLASS=>70,
 :T_MODULE=>9,
 :T_FLOAT=>0,
 :T_STRING=>8207,
 :T_REGEXP=>50,
 :T_ARRAY=>439,
 :T_HASH=>26,
 :T_STRUCT=>5,
 :T_BIGNUM=>0,
 :T_FILE=>0,
 :T_DATA=>7,
 :T_MATCH=>0,
 :T_COMPLEX=>0,
 :T_RATIONAL=>0,
 16=>0,
 :T_NIL=>0,
 :T_FALSE=>0,
 :T_UNDEF=>0,
 23=>0,
 24=>0,
 25=>0,
 :T_IMEMO=>1385,
 :T_NODE=>0,
 :T_ICLASS=>9,
 :T_ZOMBIE=>0,
 :T_MOVED=>0}
 => {:T_NONE=>0, :T_OBJECT=>249, :T_CLASS=>70, :T_MODULE=>9, :T_FLOAT=>0, :T_STRING=>8207, :T_REGEXP=>50, :T_ARRAY=>439, :T_HASH=>26, :T_STRUCT=>5, :T_BIGNUM=>0, :T_FILE=>0, :T_DATA=>7, :T_MATCH=>0, :T_COMPLEX=>0, :T_RATIONAL=>0, 16=>0, :T_NIL=>0, :T_TRUE=>0, :T_FALSE=>0, :T_SYMBOL=>0, :T_FIXNUM=>0, :T_UNDEF=>0, 23=>0, 24=>0, 25=>0, :T_IMEMO=>1385, :T_NODE=>0, :T_ICLASS=>9, :T_ZOMBIE=>0, :T_MOVED=>0}
2.7.0 :022 > s[:on_body]
 => 0
2.7.0 :023 > 10000.times{ a<<"x".dup }; pp GC.verify_compaction_references[:moved]
{:T_NONE=>0,
 :T_OBJECT=>0,
 :T_CLASS=>0,
 :T_MODULE=>0,
 :T_FLOAT=>0,
 :T_STRING=>5733,
 :T_REGEXP=>0,
 :T_ARRAY=>53,
 :T_HASH=>0,
 :T_STRUCT=>26,
 :T_BIGNUM=>0,
 :T_FILE=>0,
 :T_DATA=>0,
 :T_MATCH=>0,
 :T_COMPLEX=>0,
 :T_RATIONAL=>0,
 16=>0,
 :T_NIL=>0,
 :T_TRUE=>0,
 :T_SYMBOL=>0,
 :T_UNDEF=>0,
 23=>0,
 24=>0,
 25=>0,
 :T_IMEMO=>0,
 :T_NODE=>0,
 :T_ICLASS=>0,
 :T_ZOMBIE=>0,
 :T_MOVED=>0}
 => {:T_NONE=>0, :T_OBJECT=>0, :T_CLASS=>0, :T_MODULE=>0, :T_FLOAT=>0, :T_STRING=>5733, :T_REGEXP=>0, :T_ARRAY=>53, :T_HASH=>0, :T_STRUCT=>26, :T_BIGNUM=>0, :T_FILE=>0, :T_DATA=>0, :T_MATCH=>0, :T_COMPLEX=>0, :T_RATIONAL=>0, 16=>0, :T_NIL=>0, :T_TRUE=>0, :T_FALSE=>0, :T_SYMBOL=>0, :T_FIXNUM=>0, :T_UNDEF=>0, 23=>0, 24=>0, 25=>0, :T_IMEMO=>0, :T_NODE=>0, :T_ICLASS=>0, :T_ZOMBIE=>0, :T_MOVED=>0}
2.7.0 :024 > s[:on_body]
 => 0
2.7.0 :025 > s=new_settings.new
2.7.0 :026 > 10000.times{ a<<"x".dup }; pp GC.verify_compaction_references[:moved]
{:T_NONE=>0,
 :T_OBJECT=>11,
 :T_CLASS=>90,
 :T_MODULE=>7,
 :T_FLOAT=>0,
 :T_STRING=>17750,
 :T_REGEXP=>18,
 :T_ARRAY=>99,
 :T_HASH=>8,
 :T_STRUCT=>1,
 :T_BIGNUM=>0,
 :T_FILE=>0,
 :T_DATA=>11,
 :T_MATCH=>0,
 :T_COMPLEX=>0,
 :T_RATIONAL=>0,
 16=>0,
 :T_NIL=>0,
 :T_SYMBOL=>0,
 :T_UNDEF=>0,
 23=>0,
 24=>0,
 25=>0,
 :T_IMEMO=>1283,
 :T_NODE=>0,
 :T_ICLASS=>11,
 :T_ZOMBIE=>0,
 :T_MOVED=>0}
 => {:T_NONE=>0, :T_OBJECT=>11, :T_CLASS=>90, :T_MODULE=>7, :T_FLOAT=>0, :T_STRING=>17750, :T_REGEXP=>18, :T_ARRAY=>99, :T_HASH=>8, :T_STRUCT=>1, :T_BIGNUM=>0, :T_FILE=>0, :T_DATA=>11, :T_MATCH=>0, :T_COMPLEX=>0, :T_RATIONAL=>0, 16=>0, :T_NIL=>0, :T_TRUE=>0, :T_FALSE=>0, :T_SYMBOL=>0, :T_FIXNUM=>0, :T_UNDEF=>0, 23=>0, 24=>0, 25=>0, :T_IMEMO=>1283, :T_NODE=>0, :T_ICLASS=>11, :T_ZOMBIE=>0, :T_MOVED=>0}
2.7.0 :027 > s[:on_body]
 => 0
2.7.0 :028 > 10000.times{ a<<"x".dup }; pp GC.verify_compaction_references[:moved]
{:T_NONE=>0,
 :T_OBJECT=>0,
 :T_CLASS=>0,
 :T_MODULE=>0,
 :T_FLOAT=>0,
 :T_STRING=>5322,
 :T_REGEXP=>0,
 :T_ARRAY=>0,
 :T_HASH=>0,
 :T_STRUCT=>0,
 :T_BIGNUM=>0,
 :T_FILE=>0,
 :T_DATA=>0,
 :T_MATCH=>0,
 :T_COMPLEX=>0,
 :T_RATIONAL=>0,
 16=>0,
 :T_NIL=>0,
 :T_TRUE=>0,
 23=>0,
 25=>0,
 :T_IMEMO=>0,
 :T_NODE=>0,
 :T_ICLASS=>0,
 :T_ZOMBIE=>0,
 :T_MOVED=>0}
 => {:T_NONE=>0, :T_OBJECT=>0, :T_CLASS=>0, :T_MODULE=>0, :T_FLOAT=>0, :T_STRING=>5322, :T_REGEXP=>0, :T_ARRAY=>0, :T_HASH=>0, :T_STRUCT=>0, :T_BIGNUM=>0, :T_FILE=>0, :T_DATA=>0, :T_MATCH=>0, :T_COMPLEX=>0, :T_RATIONAL=>0, 16=>0, :T_NIL=>0, :T_TRUE=>0, :T_FALSE=>0, :T_SYMBOL=>0, :T_FIXNUM=>0, :T_UNDEF=>0, 23=>0, 24=>0, 25=>0, :T_IMEMO=>0, :T_NODE=>0, :T_ICLASS=>0, :T_ZOMBIE=>0, :T_MOVED=>0}
2.7.0 :029 > s=new_settings.new
2.7.0 :030 > s[:on_body]
 => 0
2.7.0 :031 > 10000.times{ a<<"x".dup }; pp GC.verify_compaction_references[:moved]
{:T_NONE=>0,
 :T_OBJECT=>249,
 :T_CLASS=>54,
 :T_MODULE=>8,
 :T_FLOAT=>0,
 :T_STRING=>27545,
 :T_REGEXP=>50,
 :T_ARRAY=>411,
 :T_HASH=>24,
 :T_STRUCT=>5,
 :T_BIGNUM=>0,
 :T_FILE=>0,
 :T_DATA=>2,
 :T_MATCH=>0,
 :T_COMPLEX=>0,
 :T_RATIONAL=>0,
 16=>0,
 :T_NIL=>0,
 :T_TRUE=>0,
 :T_FALSE=>0,
 :T_SYMBOL=>0,
 :T_UNDEF=>0,
 25=>0,
 :T_NODE=>0,
 :T_ICLASS=>6,
 :T_ZOMBIE=>0,
 :T_MOVED=>0}
 => {:T_NONE=>0, :T_OBJECT=>249, :T_CLASS=>54, :T_MODULE=>8, :T_FLOAT=>0, :T_STRING=>27545, :T_REGEXP=>50, :T_ARRAY=>411, :T_HASH=>24, :T_STRUCT=>5, :T_BIGNUM=>0, :T_FILE=>0, :T_DATA=>2, :T_MATCH=>0, :T_COMPLEX=>0, :T_RATIONAL=>0, 16=>0, :T_NIL=>0, :T_TRUE=>0, :T_FALSE=>0, :T_SYMBOL=>0, :T_FIXNUM=>0, :T_UNDEF=>0, 23=>0, 24=>0, 25=>0, :T_IMEMO=>1037, :T_NODE=>0, :T_ICLASS=>6, :T_ZOMBIE=>0, :T_MOVED=>0}
2.7.0 :032 > s=new_settings.new
2.7.0 :033 > s=new_settings.new
2.7.0 :034 > s=new_settings.new
2.7.0 :035 > s[:on_body]
 => 0
2.7.0 :036 > 10000.times{ a<<"x".dup }; pp GC.verify_compaction_references[:moved]
{:T_NONE=>0,
 :T_OBJECT=>0,
 :T_CLASS=>0,
 :T_MODULE=>0,
 :T_FLOAT=>0,
 :T_STRING=>8529,
 :T_REGEXP=>0,
 :T_ARRAY=>0,
 :T_HASH=>0,
 :T_STRUCT=>0,
 :T_BIGNUM=>0,
 :T_FILE=>0,
 :T_DATA=>0,
 :T_MATCH=>0,
 :T_COMPLEX=>0,
 :T_RATIONAL=>0,
 16=>0,
 :T_NIL=>0,
 :T_TRUE=>0,
 :T_FALSE=>0,
 :T_SYMBOL=>0,
 :T_UNDEF=>0,
 24=>0,
 25=>0,
 :T_IMEMO=>0,
 :T_NODE=>0,
 :T_ICLASS=>0,
 :T_ZOMBIE=>0,
 :T_MOVED=>0}
 => {:T_NONE=>0, :T_OBJECT=>0, :T_CLASS=>0, :T_MODULE=>0, :T_FLOAT=>0, :T_STRING=>8529, :T_REGEXP=>0, :T_ARRAY=>0, :T_HASH=>0, :T_STRUCT=>0, :T_BIGNUM=>0, :T_FILE=>0, :T_DATA=>0, :T_MATCH=>0, :T_COMPLEX=>0, :T_RATIONAL=>0, 16=>0, :T_NIL=>0, :T_TRUE=>0, :T_FALSE=>0, :T_SYMBOL=>0, :T_FIXNUM=>0, :T_UNDEF=>0, 23=>0, 24=>0, 25=>0, :T_IMEMO=>0, :T_NODE=>0, :T_ICLASS=>0, :T_ZOMBIE=>0, :T_MOVED=>0}
2.7.0 :037 > s[:on_body]
 => 0
2.7.0 :038 > s=new_settings.new
2.7.0 :039 > s[:on_body]
 => 0
2.7.0 :040 > 10000.times{ a<<"x".dup }; pp GC.verify_compaction_references[:moved]
{:T_NONE=>0,
 :T_OBJECT=>0,
 :T_CLASS=>0,
 :T_MODULE=>0,
 :T_FLOAT=>0,
 :T_STRING=>10385,
 :T_REGEXP=>0,
 :T_ARRAY=>53,
 :T_HASH=>2,
 :T_STRUCT=>26,
 :T_BIGNUM=>0,
 :T_FILE=>0,
 :T_DATA=>0,
 :T_MATCH=>0,
 :T_COMPLEX=>0,
 :T_RATIONAL=>0,
 16=>0,
 :T_NIL=>0,
 :T_SYMBOL=>0,
 :T_FIXNUM=>0,
 :T_UNDEF=>0,
 23=>0,
 24=>0,
 25=>0,
 :T_IMEMO=>0,
 :T_NODE=>0,
 :T_ICLASS=>0,
 :T_ZOMBIE=>0,
 :T_MOVED=>0}
 => {:T_NONE=>0, :T_OBJECT=>0, :T_CLASS=>0, :T_MODULE=>0, :T_FLOAT=>0, :T_STRING=>10385, :T_REGEXP=>0, :T_ARRAY=>53, :T_HASH=>2, :T_STRUCT=>26, :T_BIGNUM=>0, :T_FILE=>0, :T_DATA=>0, :T_MATCH=>0, :T_COMPLEX=>0, :T_RATIONAL=>0, 16=>0, :T_NIL=>0, :T_TRUE=>0, :T_FALSE=>0, :T_SYMBOL=>0, :T_FIXNUM=>0, :T_UNDEF=>0, 23=>0, 24=>0, 25=>0, :T_IMEMO=>0, :T_NODE=>0, :T_ICLASS=>0, :T_ZOMBIE=>0, :T_MOVED=>0}
2.7.0 :041 > s[:on_body]
 => 0
2.7.0 :042 > 10000.times{ a<<"x".dup }; pp GC.verify_compaction_references[:moved]
{:T_NONE=>0,
 :T_OBJECT=>0,
 :T_CLASS=>0,
 :T_MODULE=>0,
 :T_FLOAT=>0,
 :T_STRING=>9997,
 :T_REGEXP=>0,
 :T_ARRAY=>55,
 :T_HASH=>2,
 :T_STRUCT=>26,
 :T_BIGNUM=>0,
 :T_FILE=>0,
 :T_DATA=>0,
 :T_MATCH=>0,
 :T_COMPLEX=>0,
 :T_RATIONAL=>0,
 16=>0,
 :T_TRUE=>0,
 :T_FALSE=>0,
 :T_SYMBOL=>0,
 :T_FIXNUM=>0,
 :T_UNDEF=>0,
 23=>0,
 24=>0,
 25=>0,
 :T_IMEMO=>0,
 :T_NODE=>0,
 :T_ICLASS=>0,
 :T_ZOMBIE=>0,
 :T_MOVED=>0}
 => {:T_NONE=>0, :T_OBJECT=>0, :T_CLASS=>0, :T_MODULE=>0, :T_FLOAT=>0, :T_STRING=>9997, :T_REGEXP=>0, :T_ARRAY=>55, :T_HASH=>2, :T_STRUCT=>26, :T_BIGNUM=>0, :T_FILE=>0, :T_DATA=>0, :T_MATCH=>0, :T_COMPLEX=>0, :T_RATIONAL=>0, 16=>0, :T_NIL=>0, :T_TRUE=>0, :T_FALSE=>0, :T_SYMBOL=>0, :T_FIXNUM=>0, :T_UNDEF=>0, 23=>0, 24=>0, 25=>0, :T_IMEMO=>0, :T_NODE=>0, :T_ICLASS=>0, :T_ZOMBIE=>0, :T_MOVED=>0}
2.7.0 :043 > s=new_settings.new
2.7.0 :044 > 10000.times{ a<<"x".dup }; pp GC.verify_compaction_references[:moved]
{:T_NONE=>0,
 :T_OBJECT=>0,
 :T_CLASS=>2,
 :T_MODULE=>0,
 :T_FLOAT=>0,
 :T_STRING=>10481,
 :T_REGEXP=>0,
 :T_ARRAY=>54,
 :T_HASH=>2,
 :T_STRUCT=>26,
 :T_BIGNUM=>0,
 :T_FILE=>0,
 :T_DATA=>10,
 :T_MATCH=>0,
 :T_COMPLEX=>0,
 :T_RATIONAL=>0,
 16=>0,
 :T_NIL=>0,
 :T_TRUE=>0,
 :T_FALSE=>0,
 :T_SYMBOL=>0,
 :T_FIXNUM=>0,
 :T_UNDEF=>0,
 23=>0,
 24=>0,
 25=>0,
 :T_IMEMO=>0,
 :T_NODE=>0,
 :T_ICLASS=>0,
 :T_ZOMBIE=>0,
 :T_MOVED=>0}
 => {:T_NONE=>0, :T_OBJECT=>0, :T_CLASS=>2, :T_MODULE=>0, :T_FLOAT=>0, :T_STRING=>10481, :T_REGEXP=>0, :T_ARRAY=>54, :T_HASH=>2, :T_STRUCT=>26, :T_BIGNUM=>0, :T_FILE=>0, :T_DATA=>10, :T_MATCH=>0, :T_COMPLEX=>0, :T_RATIONAL=>0, 16=>0, :T_NIL=>0, :T_TRUE=>0, :T_FALSE=>0, :T_SYMBOL=>0, :T_FIXNUM=>0, :T_UNDEF=>0, 23=>0, 24=>0, 25=>0, :T_IMEMO=>0, :T_NODE=>0, :T_ICLASS=>0, :T_ZOMBIE=>0, :T_MOVED=>0}
2.7.0 :045 > s[:on_body]
(irb):45: [BUG] Segmentation fault at 0x0000000000000028
ruby 2.7.0p0 (2019-12-25 revision 647ee6f091) [x86_64-linux]

-- Control frame information -----------------------------------------------
c:0022 p:---- s:0107 e:000106 CFUNC  :[]
c:0021 p:0006 s:0102 e:000101 EVAL   (irb):45 [FINISH]
c:0020 p:---- s:0099 e:000098 CFUNC  :eval
c:0019 p:0020 s:0091 e:000090 METHOD /home/lars/.rvm/rubies/ruby-2.7.0/lib/ruby/2.7.0/irb/workspace.rb:114
c:0018 p:0059 s:0083 e:000081 METHOD /home/lars/.rvm/rubies/ruby-2.7.0/lib/ruby/2.7.0/irb/context.rb:419
c:0017 p:0033 s:0074 e:000073 BLOCK  /home/lars/.rvm/rubies/ruby-2.7.0/lib/ruby/2.7.0/irb.rb:539
c:0016 p:0024 s:0071 e:000070 METHOD /home/lars/.rvm/rubies/ruby-2.7.0/lib/ruby/2.7.0/irb.rb:693
c:0015 p:0007 s:0065 e:000064 BLOCK  /home/lars/.rvm/rubies/ruby-2.7.0/lib/ruby/2.7.0/irb.rb:536
c:0014 p:0114 s:0060 e:000059 BLOCK  /home/lars/.rvm/rubies/ruby-2.7.0/lib/ruby/2.7.0/irb/ruby-lex.rb:150 [FINISH]
c:0013 p:---- s:0056 e:000055 CFUNC  :loop
c:0012 p:0005 s:0052 e:000051 BLOCK  /home/lars/.rvm/rubies/ruby-2.7.0/lib/ruby/2.7.0/irb/ruby-lex.rb:135 [FINISH]
c:0011 p:---- s:0049 e:000048 CFUNC  :catch
c:0010 p:0010 s:0044 e:000043 METHOD /home/lars/.rvm/rubies/ruby-2.7.0/lib/ruby/2.7.0/irb/ruby-lex.rb:134
c:0009 p:0046 s:0040 E:0013a8 METHOD /home/lars/.rvm/rubies/ruby-2.7.0/lib/ruby/2.7.0/irb.rb:535
c:0008 p:0004 s:0035 e:000034 BLOCK  /home/lars/.rvm/rubies/ruby-2.7.0/lib/ruby/2.7.0/irb.rb:470 [FINISH]
c:0007 p:---- s:0032 e:000031 CFUNC  :catch
c:0006 p:0057 s:0027 E:001de8 METHOD /home/lars/.rvm/rubies/ruby-2.7.0/lib/ruby/2.7.0/irb.rb:469
c:0005 p:0104 s:0022 e:000021 METHOD /home/lars/.rvm/rubies/ruby-2.7.0/lib/ruby/2.7.0/irb.rb:398
c:0004 p:0019 s:0016 e:000015 TOP    /home/lars/.rvm/rubies/ruby-2.7.0/lib/ruby/gems/2.7.0/gems/irb-1.2.1/exe/irb:11 [FINISH]
c:0003 p:---- s:0013 e:000012 CFUNC  :load
c:0002 p:0112 s:0008 E:000a30 EVAL   /home/lars/.rvm/rubies/ruby-2.7.0/bin/irb:23 [FINISH]
c:0001 p:0000 s:0003 E:0021f0 (none) [FINISH]

-- Ruby level backtrace information ----------------------------------------
/home/lars/.rvm/rubies/ruby-2.7.0/bin/irb:23:in `<main>'
/home/lars/.rvm/rubies/ruby-2.7.0/bin/irb:23:in `load'
/home/lars/.rvm/rubies/ruby-2.7.0/lib/ruby/gems/2.7.0/gems/irb-1.2.1/exe/irb:11:in `<top (required)>'
/home/lars/.rvm/rubies/ruby-2.7.0/lib/ruby/2.7.0/irb.rb:398:in `start'
/home/lars/.rvm/rubies/ruby-2.7.0/lib/ruby/2.7.0/irb.rb:469:in `run'
/home/lars/.rvm/rubies/ruby-2.7.0/lib/ruby/2.7.0/irb.rb:469:in `catch'
/home/lars/.rvm/rubies/ruby-2.7.0/lib/ruby/2.7.0/irb.rb:470:in `block in run'
/home/lars/.rvm/rubies/ruby-2.7.0/lib/ruby/2.7.0/irb.rb:535:in `eval_input'
/home/lars/.rvm/rubies/ruby-2.7.0/lib/ruby/2.7.0/irb/ruby-lex.rb:134:in `each_top_level_statement'
/home/lars/.rvm/rubies/ruby-2.7.0/lib/ruby/2.7.0/irb/ruby-lex.rb:134:in `catch'
/home/lars/.rvm/rubies/ruby-2.7.0/lib/ruby/2.7.0/irb/ruby-lex.rb:135:in `block in each_top_level_statement'
/home/lars/.rvm/rubies/ruby-2.7.0/lib/ruby/2.7.0/irb/ruby-lex.rb:135:in `loop'
/home/lars/.rvm/rubies/ruby-2.7.0/lib/ruby/2.7.0/irb/ruby-lex.rb:150:in `block (2 levels) in each_top_level_statement'
/home/lars/.rvm/rubies/ruby-2.7.0/lib/ruby/2.7.0/irb.rb:536:in `block in eval_input'
/home/lars/.rvm/rubies/ruby-2.7.0/lib/ruby/2.7.0/irb.rb:693:in `signal_status'
/home/lars/.rvm/rubies/ruby-2.7.0/lib/ruby/2.7.0/irb.rb:539:in `block (2 levels) in eval_input'
/home/lars/.rvm/rubies/ruby-2.7.0/lib/ruby/2.7.0/irb/context.rb:419:in `evaluate'
/home/lars/.rvm/rubies/ruby-2.7.0/lib/ruby/2.7.0/irb/workspace.rb:114:in `evaluate'
/home/lars/.rvm/rubies/ruby-2.7.0/lib/ruby/2.7.0/irb/workspace.rb:114:in `eval'
(irb):45:in `irb_binding'
(irb):45:in `[]'

-- Machine register context ------------------------------------------------
 RIP: 0x00007f102e8ce0b3 RBP: 0x00005624fffc43f0 RSP: 0x00007ffeeb2e88d0
 RAX: 0x0000000000000001 RBX: 0x00005624ffae75c0 RCX: 0x0000000000000002
 RDX: 0x00005624ffccb3d0 RDI: 0x0000000000000000 RSI: 0x0000000001b0f10c
  R8: 0x00005624ffae0360  R9: 0x000000000000001f R10: 0x0000000055550083
 R11: 0x0000000000000000 R12: 0x0000000001b0f10c R13: 0x00005624fffc42e0
 R14: 0x00005624ffae75c0 R15: 0x00005624ff16e200 EFL: 0x0000000000010202

-- C level backtrace information -------------------------------------------
/home/lars/.rvm/rubies/ruby-2.7.0/lib/libruby.so.2.7(rb_vm_bugreport+0x573) [0x7f1032c66a73] vm_dump.c:755
[0x7f1032a89dab]
/home/lars/.rvm/rubies/ruby-2.7.0/lib/libruby.so.2.7(sigsegv+0x4d) [0x7f1032bc37cd] signal.c:946
/lib/x86_64-linux-gnu/libc.so.6(0x7f10327e5470) [0x7f10327e5470]
/home/lars/.rvm/gems/ruby-2.7.0/gems/ffi-1.12.1/lib/ffi_c.so(struct_aref+0x73) [0x7f102e8ce0b3] Struct.c:317
[0x7f1032c3eb00]
[0x7f1032c53ffb]
[0x7f1032c4c20b]
[0x7f1032c52374]
/home/lars/.rvm/rubies/ruby-2.7.0/lib/libruby.so.2.7(rb_f_eval+0x179) [0x7f1032c55459] vm_eval.c:1646
[0x7f1032c3eb00]
[0x7f1032c4c20b]
[0x7f1032c52b64]
/home/lars/.rvm/rubies/ruby-2.7.0/lib/libruby.so.2.7(loop_i+0x2f7) [0x7f1032c55b57] vm.c:1044
/home/lars/.rvm/rubies/ruby-2.7.0/lib/libruby.so.2.7(rb_vrescue2+0xe4) [0x7f1032a91c34] eval.c:989
/home/lars/.rvm/rubies/ruby-2.7.0/lib/libruby.so.2.7(rb_rescue2+0x8e) [0x7f1032a91e4e] eval.c:966
[0x7f1032c3eb00]
[0x7f1032c53ffb]
[0x7f1032c4c2d1]
[0x7f1032c52374]
/home/lars/.rvm/rubies/ruby-2.7.0/lib/libruby.so.2.7(catch_i+0x2eb) [0x7f1032c5666b] vm.c:1044
/home/lars/.rvm/rubies/ruby-2.7.0/lib/libruby.so.2.7(vm_catch_protect+0xba) [0x7f1032c44d9a] vm_eval.c:2308
/home/lars/.rvm/rubies/ruby-2.7.0/lib/libruby.so.2.7(rb_catch_obj+0x30) [0x7f1032c44eb0] vm_eval.c:2334
[0x7f1032c3eb00]
[0x7f1032c53ffb]
[0x7f1032c4c2d1]
[0x7f1032c52374]
/home/lars/.rvm/rubies/ruby-2.7.0/lib/libruby.so.2.7(catch_i+0x2eb) [0x7f1032c5666b] vm.c:1044
/home/lars/.rvm/rubies/ruby-2.7.0/lib/libruby.so.2.7(vm_catch_protect+0xba) [0x7f1032c44d9a] vm_eval.c:2308
/home/lars/.rvm/rubies/ruby-2.7.0/lib/libruby.so.2.7(rb_catch_obj+0x30) [0x7f1032c44eb0] vm_eval.c:2334
[0x7f1032c3eb00]
[0x7f1032c53ffb]
[0x7f1032c4c2d1]
[0x7f1032c52b64]
[0x7f1032aea413]
[0x7f1032c3eb00]
[0x7f1032c53ffb]
[0x7f1032c4c20b]
[0x7f1032c52b64]
/home/lars/.rvm/rubies/ruby-2.7.0/lib/libruby.so.2.7(rb_ec_exec_node+0xc1) [0x7f1032a8e8e1] eval.c:277
/home/lars/.rvm/rubies/ruby-2.7.0/lib/libruby.so.2.7(ruby_run_node+0x4e) [0x7f1032a941fe] eval.c:335
/home/lars/.rvm/rubies/ruby-2.7.0/bin/ruby(main+0x5f) [0x5624fc7f417f] ./main.c:50

-- Other runtime information -----------------------------------------------

* Loaded script: irb

* Loaded features:

    0 enumerator.so
    1 thread.rb
    2 rational.so
    3 complex.so
    4 ruby2_keywords.rb
    5 /home/lars/.rvm/rubies/ruby-2.7.0/lib/ruby/2.7.0/x86_64-linux/enc/encdb.so
    6 /home/lars/.rvm/rubies/ruby-2.7.0/lib/ruby/2.7.0/x86_64-linux/enc/trans/transdb.so
    7 /home/lars/.rvm/rubies/ruby-2.7.0/lib/ruby/2.7.0/x86_64-linux/rbconfig.rb
    8 /home/lars/.rvm/rubies/ruby-2.7.0/lib/ruby/2.7.0/rubygems/compatibility.rb
    9 /home/lars/.rvm/rubies/ruby-2.7.0/lib/ruby/2.7.0/rubygems/defaults.rb
   10 /home/lars/.rvm/rubies/ruby-2.7.0/lib/ruby/2.7.0/rubygems/deprecate.rb
   11 /home/lars/.rvm/rubies/ruby-2.7.0/lib/ruby/2.7.0/rubygems/errors.rb
   12 /home/lars/.rvm/rubies/ruby-2.7.0/lib/ruby/2.7.0/rubygems/version.rb
   13 /home/lars/.rvm/rubies/ruby-2.7.0/lib/ruby/2.7.0/rubygems/requirement.rb
   14 /home/lars/.rvm/rubies/ruby-2.7.0/lib/ruby/2.7.0/rubygems/platform.rb
   15 /home/lars/.rvm/rubies/ruby-2.7.0/lib/ruby/2.7.0/rubygems/basic_specification.rb
   16 /home/lars/.rvm/rubies/ruby-2.7.0/lib/ruby/2.7.0/rubygems/stub_specification.rb
   17 /home/lars/.rvm/rubies/ruby-2.7.0/lib/ruby/2.7.0/rubygems/util.rb
   18 /home/lars/.rvm/rubies/ruby-2.7.0/lib/ruby/2.7.0/rubygems/text.rb
   19 /home/lars/.rvm/rubies/ruby-2.7.0/lib/ruby/2.7.0/rubygems/user_interaction.rb
   20 /home/lars/.rvm/rubies/ruby-2.7.0/lib/ruby/2.7.0/rubygems/specification_policy.rb
   21 /home/lars/.rvm/rubies/ruby-2.7.0/lib/ruby/2.7.0/rubygems/util/list.rb
   22 /home/lars/.rvm/rubies/ruby-2.7.0/lib/ruby/2.7.0/rubygems/specification.rb
   23 /home/lars/.rvm/rubies/ruby-2.7.0/lib/ruby/2.7.0/rubygems/exceptions.rb
   24 /home/lars/.rvm/rubies/ruby-2.7.0/lib/ruby/2.7.0/rubygems/bundler_version_finder.rb
   25 /home/lars/.rvm/rubies/ruby-2.7.0/lib/ruby/2.7.0/rubygems/dependency.rb
   26 /home/lars/.rvm/rubies/ruby-2.7.0/lib/ruby/2.7.0/rubygems/core_ext/kernel_gem.rb
   27 /home/lars/.rvm/rubies/ruby-2.7.0/lib/ruby/2.7.0/x86_64-linux/monitor.so
   28 /home/lars/.rvm/rubies/ruby-2.7.0/lib/ruby/2.7.0/monitor.rb
   29 /home/lars/.rvm/rubies/ruby-2.7.0/lib/ruby/2.7.0/rubygems/core_ext/kernel_require.rb
   30 /home/lars/.rvm/rubies/ruby-2.7.0/lib/ruby/2.7.0/rubygems/core_ext/kernel_warn.rb
   31 /home/lars/.rvm/rubies/ruby-2.7.0/lib/ruby/2.7.0/rubygems.rb
   32 /home/lars/.rvm/rubies/ruby-2.7.0/lib/ruby/2.7.0/rubygems/path_support.rb
   33 /home/lars/.rvm/rubies/ruby-2.7.0/lib/ruby/2.7.0/did_you_mean/version.rb
   34 /home/lars/.rvm/rubies/ruby-2.7.0/lib/ruby/2.7.0/did_you_mean/core_ext/name_error.rb
   35 /home/lars/.rvm/rubies/ruby-2.7.0/lib/ruby/2.7.0/did_you_mean/levenshtein.rb
   36 /home/lars/.rvm/rubies/ruby-2.7.0/lib/ruby/2.7.0/did_you_mean/jaro_winkler.rb
   37 /home/lars/.rvm/rubies/ruby-2.7.0/lib/ruby/2.7.0/did_you_mean/spell_checker.rb
   38 /home/lars/.rvm/rubies/ruby-2.7.0/lib/ruby/2.7.0/did_you_mean/spell_checkers/name_error_checkers/class_name_checker.rb
   39 /home/lars/.rvm/rubies/ruby-2.7.0/lib/ruby/2.7.0/did_you_mean/spell_checkers/name_error_checkers/variable_name_checker.rb
   40 /home/lars/.rvm/rubies/ruby-2.7.0/lib/ruby/2.7.0/did_you_mean/spell_checkers/name_error_checkers.rb
   41 /home/lars/.rvm/rubies/ruby-2.7.0/lib/ruby/2.7.0/did_you_mean/spell_checkers/method_name_checker.rb
   42 /home/lars/.rvm/rubies/ruby-2.7.0/lib/ruby/2.7.0/did_you_mean/spell_checkers/key_error_checker.rb
   43 /home/lars/.rvm/rubies/ruby-2.7.0/lib/ruby/2.7.0/did_you_mean/spell_checkers/null_checker.rb
   44 /home/lars/.rvm/rubies/ruby-2.7.0/lib/ruby/2.7.0/did_you_mean/formatters/plain_formatter.rb
   45 /home/lars/.rvm/rubies/ruby-2.7.0/lib/ruby/2.7.0/did_you_mean/tree_spell_checker.rb
   46 /home/lars/.rvm/rubies/ruby-2.7.0/lib/ruby/2.7.0/did_you_mean.rb
   47 /home/lars/.rvm/rubies/ruby-2.7.0/lib/ruby/2.7.0/tsort.rb
   48 /home/lars/.rvm/rubies/ruby-2.7.0/lib/ruby/2.7.0/rubygems/request_set/gem_dependency_api.rb
   49 /home/lars/.rvm/rubies/ruby-2.7.0/lib/ruby/2.7.0/rubygems/request_set/lockfile/parser.rb
   50 /home/lars/.rvm/rubies/ruby-2.7.0/lib/ruby/2.7.0/rubygems/request_set/lockfile/tokenizer.rb
   51 /home/lars/.rvm/rubies/ruby-2.7.0/lib/ruby/2.7.0/rubygems/request_set/lockfile.rb
   52 /home/lars/.rvm/rubies/ruby-2.7.0/lib/ruby/2.7.0/rubygems/request_set.rb
   53 /home/lars/.rvm/rubies/ruby-2.7.0/lib/ruby/2.7.0/rubygems/resolver/molinillo/lib/molinillo/gem_metadata.rb
   54 /home/lars/.rvm/rubies/ruby-2.7.0/lib/ruby/2.7.0/rubygems/resolver/molinillo/lib/molinillo/errors.rb
   55 /home/lars/.rvm/rubies/ruby-2.7.0/lib/ruby/2.7.0/set.rb
   56 /home/lars/.rvm/rubies/ruby-2.7.0/lib/ruby/2.7.0/rubygems/resolver/molinillo/lib/molinillo/dependency_graph/action.rb
   57 /home/lars/.rvm/rubies/ruby-2.7.0/lib/ruby/2.7.0/rubygems/resolver/molinillo/lib/molinillo/dependency_graph/add_edge_no_circular.rb
   58 /home/lars/.rvm/rubies/ruby-2.7.0/lib/ruby/2.7.0/rubygems/resolver/molinillo/lib/molinillo/dependency_graph/add_vertex.rb
   59 /home/lars/.rvm/rubies/ruby-2.7.0/lib/ruby/2.7.0/rubygems/resolver/molinillo/lib/molinillo/dependency_graph/delete_edge.rb
   60 /home/lars/.rvm/rubies/ruby-2.7.0/lib/ruby/2.7.0/rubygems/resolver/molinillo/lib/molinillo/dependency_graph/detach_vertex_named.rb
   61 /home/lars/.rvm/rubies/ruby-2.7.0/lib/ruby/2.7.0/rubygems/resolver/molinillo/lib/molinillo/dependency_graph/set_payload.rb
   62 /home/lars/.rvm/rubies/ruby-2.7.0/lib/ruby/2.7.0/rubygems/resolver/molinillo/lib/molinillo/dependency_graph/tag.rb
   63 /home/lars/.rvm/rubies/ruby-2.7.0/lib/ruby/2.7.0/rubygems/resolver/molinillo/lib/molinillo/dependency_graph/log.rb
   64 /home/lars/.rvm/rubies/ruby-2.7.0/lib/ruby/2.7.0/rubygems/resolver/molinillo/lib/molinillo/dependency_graph/vertex.rb
   65 /home/lars/.rvm/rubies/ruby-2.7.0/lib/ruby/2.7.0/rubygems/resolver/molinillo/lib/molinillo/dependency_graph.rb
   66 /home/lars/.rvm/rubies/ruby-2.7.0/lib/ruby/2.7.0/rubygems/resolver/molinillo/lib/molinillo/state.rb
   67 /home/lars/.rvm/rubies/ruby-2.7.0/lib/ruby/2.7.0/rubygems/resolver/molinillo/lib/molinillo/modules/specification_provider.rb
   68 /home/lars/.rvm/rubies/ruby-2.7.0/lib/ruby/2.7.0/rubygems/resolver/molinillo/lib/molinillo/delegates/resolution_state.rb
   69 /home/lars/.rvm/rubies/ruby-2.7.0/lib/ruby/2.7.0/rubygems/resolver/molinillo/lib/molinillo/delegates/specification_provider.rb
   70 /home/lars/.rvm/rubies/ruby-2.7.0/lib/ruby/2.7.0/rubygems/resolver/molinillo/lib/molinillo/resolution.rb
   71 /home/lars/.rvm/rubies/ruby-2.7.0/lib/ruby/2.7.0/rubygems/resolver/molinillo/lib/molinillo/resolver.rb
   72 /home/lars/.rvm/rubies/ruby-2.7.0/lib/ruby/2.7.0/rubygems/resolver/molinillo/lib/molinillo/modules/ui.rb
   73 /home/lars/.rvm/rubies/ruby-2.7.0/lib/ruby/2.7.0/rubygems/resolver/molinillo/lib/molinillo.rb
   74 /home/lars/.rvm/rubies/ruby-2.7.0/lib/ruby/2.7.0/rubygems/resolver/molinillo.rb
   75 /home/lars/.rvm/rubies/ruby-2.7.0/lib/ruby/2.7.0/rubygems/resolver/activation_request.rb
   76 /home/lars/.rvm/rubies/ruby-2.7.0/lib/ruby/2.7.0/rubygems/resolver/conflict.rb
   77 /home/lars/.rvm/rubies/ruby-2.7.0/lib/ruby/2.7.0/rubygems/resolver/dependency_request.rb
   78 /home/lars/.rvm/rubies/ruby-2.7.0/lib/ruby/2.7.0/rubygems/resolver/requirement_list.rb
   79 /home/lars/.rvm/rubies/ruby-2.7.0/lib/ruby/2.7.0/rubygems/resolver/stats.rb
   80 /home/lars/.rvm/rubies/ruby-2.7.0/lib/ruby/2.7.0/rubygems/resolver/set.rb
   81 /home/lars/.rvm/rubies/ruby-2.7.0/lib/ruby/2.7.0/rubygems/resolver/api_set.rb
   82 /home/lars/.rvm/rubies/ruby-2.7.0/lib/ruby/2.7.0/rubygems/resolver/composed_set.rb
   83 /home/lars/.rvm/rubies/ruby-2.7.0/lib/ruby/2.7.0/rubygems/resolver/best_set.rb
   84 /home/lars/.rvm/rubies/ruby-2.7.0/lib/ruby/2.7.0/rubygems/resolver/current_set.rb
   85 /home/lars/.rvm/rubies/ruby-2.7.0/lib/ruby/2.7.0/rubygems/resolver/git_set.rb
   86 /home/lars/.rvm/rubies/ruby-2.7.0/lib/ruby/2.7.0/rubygems/resolver/index_set.rb
   87 /home/lars/.rvm/rubies/ruby-2.7.0/lib/ruby/2.7.0/rubygems/resolver/installer_set.rb
   88 /home/lars/.rvm/rubies/ruby-2.7.0/lib/ruby/2.7.0/rubygems/resolver/lock_set.rb
   89 /home/lars/.rvm/rubies/ruby-2.7.0/lib/ruby/2.7.0/rubygems/resolver/vendor_set.rb
   90 /home/lars/.rvm/rubies/ruby-2.7.0/lib/ruby/2.7.0/rubygems/resolver/source_set.rb
   91 /home/lars/.rvm/rubies/ruby-2.7.0/lib/ruby/2.7.0/rubygems/resolver/specification.rb
   92 /home/lars/.rvm/rubies/ruby-2.7.0/lib/ruby/2.7.0/rubygems/resolver/spec_specification.rb
   93 /home/lars/.rvm/rubies/ruby-2.7.0/lib/ruby/2.7.0/rubygems/resolver/api_specification.rb
   94 /home/lars/.rvm/rubies/ruby-2.7.0/lib/ruby/2.7.0/rubygems/resolver/git_specification.rb
   95 /home/lars/.rvm/rubies/ruby-2.7.0/lib/ruby/2.7.0/rubygems/resolver/index_specification.rb
   96 /home/lars/.rvm/rubies/ruby-2.7.0/lib/ruby/2.7.0/rubygems/resolver/installed_specification.rb
   97 /home/lars/.rvm/rubies/ruby-2.7.0/lib/ruby/2.7.0/rubygems/resolver/local_specification.rb
   98 /home/lars/.rvm/rubies/ruby-2.7.0/lib/ruby/2.7.0/rubygems/resolver/lock_specification.rb
   99 /home/lars/.rvm/rubies/ruby-2.7.0/lib/ruby/2.7.0/rubygems/resolver/vendor_specification.rb
  100 /home/lars/.rvm/rubies/ruby-2.7.0/lib/ruby/2.7.0/rubygems/resolver.rb
  101 /home/lars/.rvm/rubies/ruby-2.7.0/lib/ruby/2.7.0/uri/version.rb
  102 /home/lars/.rvm/rubies/ruby-2.7.0/lib/ruby/2.7.0/uri/rfc2396_parser.rb
  103 /home/lars/.rvm/rubies/ruby-2.7.0/lib/ruby/2.7.0/uri/rfc3986_parser.rb
  104 /home/lars/.rvm/rubies/ruby-2.7.0/lib/ruby/2.7.0/uri/common.rb
  105 /home/lars/.rvm/rubies/ruby-2.7.0/lib/ruby/2.7.0/uri/generic.rb
  106 /home/lars/.rvm/rubies/ruby-2.7.0/lib/ruby/2.7.0/uri/file.rb
  107 /home/lars/.rvm/rubies/ruby-2.7.0/lib/ruby/2.7.0/uri/ftp.rb
  108 /home/lars/.rvm/rubies/ruby-2.7.0/lib/ruby/2.7.0/uri/http.rb
  109 /home/lars/.rvm/rubies/ruby-2.7.0/lib/ruby/2.7.0/uri/https.rb
  110 /home/lars/.rvm/rubies/ruby-2.7.0/lib/ruby/2.7.0/uri/ldap.rb
  111 /home/lars/.rvm/rubies/ruby-2.7.0/lib/ruby/2.7.0/uri/ldaps.rb
  112 /home/lars/.rvm/rubies/ruby-2.7.0/lib/ruby/2.7.0/uri/mailto.rb
  113 /home/lars/.rvm/rubies/ruby-2.7.0/lib/ruby/2.7.0/uri.rb
  114 /home/lars/.rvm/rubies/ruby-2.7.0/lib/ruby/2.7.0/rubygems/source/git.rb
  115 /home/lars/.rvm/rubies/ruby-2.7.0/lib/ruby/2.7.0/rubygems/source/installed.rb
  116 /home/lars/.rvm/rubies/ruby-2.7.0/lib/ruby/2.7.0/rubygems/source/specific_file.rb
  117 /home/lars/.rvm/rubies/ruby-2.7.0/lib/ruby/2.7.0/rubygems/source/local.rb
  118 /home/lars/.rvm/rubies/ruby-2.7.0/lib/ruby/2.7.0/rubygems/source/lock.rb
  119 /home/lars/.rvm/rubies/ruby-2.7.0/lib/ruby/2.7.0/rubygems/source/vendor.rb
  120 /home/lars/.rvm/rubies/ruby-2.7.0/lib/ruby/2.7.0/rubygems/source.rb
  121 /home/lars/.rvm/rubies/ruby-2.7.0/lib/ruby/2.7.0/x86_64-linux/ripper.so
  122 /home/lars/.rvm/rubies/ruby-2.7.0/lib/ruby/2.7.0/ripper/core.rb
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  124 /home/lars/.rvm/rubies/ruby-2.7.0/lib/ruby/2.7.0/ripper/filter.rb
  125 /home/lars/.rvm/rubies/ruby-2.7.0/lib/ruby/2.7.0/ripper/sexp.rb
  126 /home/lars/.rvm/rubies/ruby-2.7.0/lib/ruby/2.7.0/ripper.rb
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  128 /home/lars/.rvm/rubies/ruby-2.7.0/lib/ruby/2.7.0/delegate.rb
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  131 /home/lars/.rvm/rubies/ruby-2.7.0/lib/ruby/2.7.0/irb/src_encoding.rb
  132 /home/lars/.rvm/rubies/ruby-2.7.0/lib/ruby/2.7.0/irb/magic-file.rb
  133 /home/lars/.rvm/rubies/ruby-2.7.0/lib/ruby/2.7.0/x86_64-linux/readline.so
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  135 /home/lars/.rvm/rubies/ruby-2.7.0/lib/ruby/2.7.0/irb/completion.rb
  136 /home/lars/.rvm/rubies/ruby-2.7.0/lib/ruby/2.7.0/x86_64-linux/io/console.so
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  138 /home/lars/.rvm/rubies/ruby-2.7.0/lib/ruby/2.7.0/forwardable/impl.rb
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  140 /home/lars/.rvm/rubies/ruby-2.7.0/lib/ruby/2.7.0/forwardable.rb
  141 /home/lars/.rvm/rubies/ruby-2.7.0/lib/ruby/2.7.0/reline/version.rb
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  145 /home/lars/.rvm/rubies/ruby-2.7.0/lib/ruby/2.7.0/reline/key_actor/base.rb
  146 /home/lars/.rvm/rubies/ruby-2.7.0/lib/ruby/2.7.0/reline/key_actor/emacs.rb
  147 /home/lars/.rvm/rubies/ruby-2.7.0/lib/ruby/2.7.0/reline/key_actor/vi_command.rb
  148 /home/lars/.rvm/rubies/ruby-2.7.0/lib/ruby/2.7.0/reline/key_actor/vi_insert.rb
  149 /home/lars/.rvm/rubies/ruby-2.7.0/lib/ruby/2.7.0/reline/key_actor.rb
  150 /home/lars/.rvm/rubies/ruby-2.7.0/lib/ruby/2.7.0/reline/key_stroke.rb
  151 /home/lars/.rvm/rubies/ruby-2.7.0/lib/ruby/2.7.0/reline/kill_ring.rb
  152 /home/lars/.rvm/rubies/ruby-2.7.0/lib/ruby/2.7.0/reline/unicode/east_asian_width.rb
  153 /home/lars/.rvm/rubies/ruby-2.7.0/lib/ruby/2.7.0/reline/unicode.rb
  154 /home/lars/.rvm/rubies/ruby-2.7.0/lib/ruby/2.7.0/fileutils.rb
  155 /home/lars/.rvm/rubies/ruby-2.7.0/lib/ruby/2.7.0/x86_64-linux/etc.so
  156 /home/lars/.rvm/rubies/ruby-2.7.0/lib/ruby/2.7.0/tmpdir.rb
  157 /home/lars/.rvm/rubies/ruby-2.7.0/lib/ruby/2.7.0/tempfile.rb
  158 /home/lars/.rvm/rubies/ruby-2.7.0/lib/ruby/2.7.0/reline/line_editor.rb
  159 /home/lars/.rvm/rubies/ruby-2.7.0/lib/ruby/2.7.0/reline/history.rb
  160 /home/lars/.rvm/rubies/ruby-2.7.0/lib/ruby/2.7.0/reline/ansi.rb
  161 /home/lars/.rvm/rubies/ruby-2.7.0/lib/ruby/2.7.0/reline/general_io.rb
  162 /home/lars/.rvm/rubies/ruby-2.7.0/lib/ruby/2.7.0/reline.rb
  163 /home/lars/.rvm/rubies/ruby-2.7.0/lib/ruby/2.7.0/irb/input-method.rb
  164 /home/lars/.rvm/rubies/ruby-2.7.0/lib/ruby/2.7.0/irb/output-method.rb
  165 /home/lars/.rvm/rubies/ruby-2.7.0/lib/ruby/2.7.0/irb/context.rb
  166 /home/lars/.rvm/rubies/ruby-2.7.0/lib/ruby/2.7.0/irb/extend-command.rb
  167 /home/lars/.rvm/rubies/ruby-2.7.0/lib/ruby/2.7.0/irb/ruby-lex.rb
  168 /home/lars/.rvm/rubies/ruby-2.7.0/lib/ruby/2.7.0/irb/locale.rb
  169 /home/lars/.rvm/rubies/ruby-2.7.0/lib/ruby/2.7.0/irb/color.rb
  170 /home/lars/.rvm/rubies/ruby-2.7.0/lib/ruby/2.7.0/irb/version.rb
  171 /home/lars/.rvm/rubies/ruby-2.7.0/lib/ruby/2.7.0/irb.rb
  172 /home/lars/.rvm/rubies/ruby-2.7.0/lib/ruby/2.7.0/irb/ext/save-history.rb
  173 /home/lars/.rvm/scripts/irbrc.rb
  174 /home/lars/.rvm/rubies/ruby-2.7.0/lib/ruby/2.7.0/prettyprint.rb
  175 /home/lars/.rvm/rubies/ruby-2.7.0/lib/ruby/2.7.0/pp.rb
  176 /home/lars/.rvm/gems/ruby-2.7.0/gems/ffi-1.12.1/lib/ffi_c.so
  177 /home/lars/.rvm/gems/ruby-2.7.0/gems/ffi-1.12.1/lib/ffi/platform.rb
  178 /home/lars/.rvm/gems/ruby-2.7.0/gems/ffi-1.12.1/lib/ffi/data_converter.rb
  179 /home/lars/.rvm/gems/ruby-2.7.0/gems/ffi-1.12.1/lib/ffi/types.rb
  180 /home/lars/.rvm/gems/ruby-2.7.0/gems/ffi-1.12.1/lib/ffi/library.rb
  181 /home/lars/.rvm/gems/ruby-2.7.0/gems/ffi-1.12.1/lib/ffi/errno.rb
  182 /home/lars/.rvm/gems/ruby-2.7.0/gems/ffi-1.12.1/lib/ffi/pointer.rb
  183 /home/lars/.rvm/gems/ruby-2.7.0/gems/ffi-1.12.1/lib/ffi/memorypointer.rb
  184 /home/lars/.rvm/gems/ruby-2.7.0/gems/ffi-1.12.1/lib/ffi/struct_layout.rb
  185 /home/lars/.rvm/gems/ruby-2.7.0/gems/ffi-1.12.1/lib/ffi/struct_layout_builder.rb
  186 /home/lars/.rvm/gems/ruby-2.7.0/gems/ffi-1.12.1/lib/ffi/struct_by_reference.rb
  187 /home/lars/.rvm/gems/ruby-2.7.0/gems/ffi-1.12.1/lib/ffi/struct.rb
  188 /home/lars/.rvm/gems/ruby-2.7.0/gems/ffi-1.12.1/lib/ffi/union.rb
  189 /home/lars/.rvm/gems/ruby-2.7.0/gems/ffi-1.12.1/lib/ffi/managedstruct.rb
  190 /home/lars/.rvm/gems/ruby-2.7.0/gems/ffi-1.12.1/lib/ffi/callback.rb
  191 /home/lars/.rvm/gems/ruby-2.7.0/gems/ffi-1.12.1/lib/ffi/io.rb
  192 /home/lars/.rvm/gems/ruby-2.7.0/gems/ffi-1.12.1/lib/ffi/autopointer.rb
  193 /home/lars/.rvm/gems/ruby-2.7.0/gems/ffi-1.12.1/lib/ffi/variadic.rb
  194 /home/lars/.rvm/gems/ruby-2.7.0/gems/ffi-1.12.1/lib/ffi/enum.rb
  195 /home/lars/.rvm/gems/ruby-2.7.0/gems/ffi-1.12.1/lib/ffi/version.rb
  196 /home/lars/.rvm/gems/ruby-2.7.0/gems/ffi-1.12.1/lib/ffi/ffi.rb
  197 /home/lars/.rvm/gems/ruby-2.7.0/gems/ffi-1.12.1/lib/ffi.rb

* Process memory map:

5624fc7f3000-5624fc7f4000 r--p 00000000 08:14 43391781                   /home/lars/.rvm/rubies/ruby-2.7.0/bin/ruby
5624fc7f4000-5624fc7f5000 r-xp 00001000 08:14 43391781                   /home/lars/.rvm/rubies/ruby-2.7.0/bin/ruby
5624fc7f5000-5624fc7f6000 r--p 00002000 08:14 43391781                   /home/lars/.rvm/rubies/ruby-2.7.0/bin/ruby
5624fc7f6000-5624fc7f7000 r--p 00002000 08:14 43391781                   /home/lars/.rvm/rubies/ruby-2.7.0/bin/ruby
5624fc7f7000-5624fc7f8000 rw-p 00003000 08:14 43391781                   /home/lars/.rvm/rubies/ruby-2.7.0/bin/ruby
5624fe6f6000-5625002d8000 rw-p 00000000 00:00 0                          [heap]
7f1026f57000-7f1028000000 r--s 00000000 08:01 27920545                   /usr/lib/debug/lib/x86_64-linux-gnu/libc-2.30.so
7f1028000000-7f1028021000 rw-p 00000000 00:00 0
7f1028021000-7f102c000000 ---p 00000000 00:00 0
7f102ce56000-7f102d045000 r--s 00000000 08:01 14418935                   /lib/x86_64-linux-gnu/libc-2.30.so
7f102d045000-7f102db20000 rw-p 00000000 00:00 0
7f102db20000-7f102e515000 r--s 00000000 08:14 43391783                   /home/lars/.rvm/rubies/ruby-2.7.0/lib/libruby.so.2.7.0
7f102e515000-7f102e60f000 rw-p 00000000 00:00 0
7f102e641000-7f102e672000 r--s 00000000 08:14 43391781                   /home/lars/.rvm/rubies/ruby-2.7.0/bin/ruby
7f102e672000-7f102e675000 r--p 00000000 08:01 14417976                   /lib/x86_64-linux-gnu/libgcc_s.so.1
7f102e675000-7f102e686000 r-xp 00003000 08:01 14417976                   /lib/x86_64-linux-gnu/libgcc_s.so.1
7f102e686000-7f102e68a000 r--p 00014000 08:01 14417976                   /lib/x86_64-linux-gnu/libgcc_s.so.1
7f102e68a000-7f102e68b000 r--p 00017000 08:01 14417976                   /lib/x86_64-linux-gnu/libgcc_s.so.1
7f102e68b000-7f102e68c000 rw-p 00018000 08:01 14417976                   /lib/x86_64-linux-gnu/libgcc_s.so.1
7f102e6b6000-7f102e6b7000 ---p 00000000 00:00 0
7f102e6b7000-7f102e8b7000 rw-p 00000000 00:00 0
7f102e8b7000-7f102e8bc000 r--p 00000000 08:14 48132119                   /home/lars/.rvm/gems/ruby-2.7.0/gems/ffi-1.12.1/lib/ffi_c.so
7f102e8bc000-7f102e8d4000 r-xp 00005000 08:14 48132119                   /home/lars/.rvm/gems/ruby-2.7.0/gems/ffi-1.12.1/lib/ffi_c.so
7f102e8d4000-7f102e8db000 r--p 0001d000 08:14 48132119                   /home/lars/.rvm/gems/ruby-2.7.0/gems/ffi-1.12.1/lib/ffi_c.so
7f102e8db000-7f102e8dc000 r--p 00023000 08:14 48132119                   /home/lars/.rvm/gems/ruby-2.7.0/gems/ffi-1.12.1/lib/ffi_c.so
7f102e8dc000-7f102e8dd000 rw-p 00024000 08:14 48132119                   /home/lars/.rvm/gems/ruby-2.7.0/gems/ffi-1.12.1/lib/ffi_c.so
7f102e8dd000-7f102e8eb000 r--p 00000000 08:01 14418105                   /lib/x86_64-linux-gnu/libtinfo.so.6.1
7f102e8eb000-7f102e8fa000 r-xp 0000e000 08:01 14418105                   /lib/x86_64-linux-gnu/libtinfo.so.6.1
7f102e8fa000-7f102e908000 r--p 0001d000 08:01 14418105                   /lib/x86_64-linux-gnu/libtinfo.so.6.1
7f102e908000-7f102e90c000 r--p 0002a000 08:01 14418105                   /lib/x86_64-linux-gnu/libtinfo.so.6.1
7f102e90c000-7f102e90d000 rw-p 0002e000 08:01 14418105                   /lib/x86_64-linux-gnu/libtinfo.so.6.1
7f102e90d000-7f102e921000 r--p 00000000 08:01 14418815                   /lib/x86_64-linux-gnu/libreadline.so.8.0
7f102e921000-7f102e94a000 r-xp 00014000 08:01 14418815                   /lib/x86_64-linux-gnu/libreadline.so.8.0
7f102e94a000-7f102e954000 r--p 0003d000 08:01 14418815                   /lib/x86_64-linux-gnu/libreadline.so.8.0
7f102e954000-7f102e956000 r--p 00046000 08:01 14418815                   /lib/x86_64-linux-gnu/libreadline.so.8.0
7f102e956000-7f102e95c000 rw-p 00048000 08:01 14418815                   /lib/x86_64-linux-gnu/libreadline.so.8.0
7f102e95c000-7f102e95d000 rw-p 00000000 00:00 0
7f102e968000-7f102e96a000 r--p 00000000 08:01 27920672                   /usr/lib/x86_64-linux-gnu/libffi.so.6.0.4
7f102e96a000-7f102e96f000 r-xp 00002000 08:01 27920672                   /usr/lib/x86_64-linux-gnu/libffi.so.6.0.4
7f102e96f000-7f102e970000 r--p 00007000 08:01 27920672                   /usr/lib/x86_64-linux-gnu/libffi.so.6.0.4
7f102e970000-7f102e971000 r--p 00007000 08:01 27920672                   /usr/lib/x86_64-linux-gnu/libffi.so.6.0.4
7f102e971000-7f102e972000 rw-p 00008000 08:01 27920672                   /usr/lib/x86_64-linux-gnu/libffi.so.6.0.4
7f102e972000-7f102e974000 r--p 00000000 08:14 43391891                   /home/lars/.rvm/rubies/ruby-2.7.0/lib/ruby/2.7.0/x86_64-linux/etc.so
7f102e974000-7f102e977000 r-xp 00002000 08:14 43391891                   /home/lars/.rvm/rubies/ruby-2.7.0/lib/ruby/2.7.0/x86_64-linux/etc.so
7f102e977000-7f102e979000 r--p 00005000 08:14 43391891                   /home/lars/.rvm/rubies/ruby-2.7.0/lib/ruby/2.7.0/x86_64-linux/etc.so
7f102e979000-7f102e97a000 r--p 00006000 08:14 43391891                   /home/lars/.rvm/rubies/ruby-2.7.0/lib/ruby/2.7.0/x86_64-linux/etc.so
7f102e97a000-7f102e97b000 rw-p 00007000 08:14 43391891                   /home/lars/.rvm/rubies/ruby-2.7.0/lib/ruby/2.7.0/x86_64-linux/etc.so
7f102e97b000-7f102e97d000 r--p 00000000 08:14 43391801                   /home/lars/.rvm/rubies/ruby-2.7.0/lib/ruby/2.7.0/x86_64-linux/pathname.so
7f102e97d000-7f102e983000 r-xp 00002000 08:14 43391801                   /home/lars/.rvm/rubies/ruby-2.7.0/lib/ruby/2.7.0/x86_64-linux/pathname.so
7f102e983000-7f102e985000 r--p 00008000 08:14 43391801                   /home/lars/.rvm/rubies/ruby-2.7.0/lib/ruby/2.7.0/x86_64-linux/pathname.so
7f102e985000-7f102e986000 r--p 00009000 08:14 43391801                   /home/lars/.rvm/rubies/ruby-2.7.0/lib/ruby/2.7.0/x86_64-linux/pathname.so
7f102e986000-7f102e987000 rw-p 0000a000 08:14 43391801                   /home/lars/.rvm/rubies/ruby-2.7.0/lib/ruby/2.7.0/x86_64-linux/pathname.so
7f102e987000-7f102e98d000 r--p 00000000 08:14 43391800                   /home/lars/.rvm/rubies/ruby-2.7.0/lib/ruby/2.7.0/x86_64-linux/ripper.so
7f102e98d000-7f102e9b1000 r-xp 00006000 08:14 43391800                   /home/lars/.rvm/rubies/ruby-2.7.0/lib/ruby/2.7.0/x86_64-linux/ripper.so
7f102e9b1000-7f102e9c8000 r--p 0002a000 08:14 43391800                   /home/lars/.rvm/rubies/ruby-2.7.0/lib/ruby/2.7.0/x86_64-linux/ripper.so
7f102e9c8000-7f102e9ca000 r--p 00040000 08:14 43391800                   /home/lars/.rvm/rubies/ruby-2.7.0/lib/ruby/2.7.0/x86_64-linux/ripper.so
7f102e9ca000-7f102e9cb000 rw-p 00042000 08:14 43391800                   /home/lars/.rvm/rubies/ruby-2.7.0/lib/ruby/2.7.0/x86_64-linux/ripper.so
7f102e9cb000-7f102ea2d000 rw-p 00000000 00:00 0
7f102ea2d000-7f102ea2e000 ---p 00000000 00:00 0
7f102ea2e000-7f102eacf000 rw-p 00000000 00:00 0
7f102eacf000-7f102ead0000 ---p 00000000 00:00 0
7f102ead0000-7f102eb71000 rw-p 00000000 00:00 0
7f102eb71000-7f102eb72000 ---p 00000000 00:00 0
7f102eb72000-7f102ec13000 rw-p 00000000 00:00 0
7f102ec13000-7f102ec14000 ---p 00000000 00:00 0
7f102ec14000-7f102ecb5000 rw-p 00000000 00:00 0
7f102ecb5000-7f102ecb6000 ---p 00000000 00:00 0
7f102ecb6000-7f102ed57000 rw-p 00000000 00:00 0
7f102ed57000-7f102ed58000 ---p 00000000 00:00 0
7f102ed58000-7f102edf9000 rw-p 00000000 00:00 0
7f102edf9000-7f102edfa000 ---p 00000000 00:00 0
7f102edfa000-7f102ee9b000 rw-p 00000000 00:00 0
7f102ee9b000-7f102ee9c000 ---p 00000000 00:00 0
7f102ee9c000-7f102ef3d000 rw-p 00000000 00:00 0
7f102ef3d000-7f102ef3e000 ---p 00000000 00:00 0
7f102ef3e000-7f102efdf000 rw-p 00000000 00:00 0
7f102efdf000-7f102efe0000 ---p 00000000 00:00 0
7f102efe0000-7f102f081000 rw-p 00000000 00:00 0
7f102f081000-7f102f082000 ---p 00000000 00:00 0
7f102f082000-7f102f123000 rw-p 00000000 00:00 0
7f102f123000-7f102f124000 ---p 00000000 00:00 0
7f102f124000-7f102f1c5000 rw-p 00000000 00:00 0
7f102f1c5000-7f102f1c6000 ---p 00000000 00:00 0
7f102f1c6000-7f102f267000 rw-p 00000000 00:00 0
7f102f267000-7f102f268000 ---p 00000000 00:00 0
7f102f268000-7f102f309000 rw-p 00000000 00:00 0
7f102f309000-7f102f30a000 ---p 00000000 00:00 0
7f102f30a000-7f102f3ab000 rw-p 00000000 00:00 0
7f102f3ab000-7f102f3ac000 ---p 00000000 00:00 0
7f102f3ac000-7f102f44d000 rw-p 00000000 00:00 0
7f102f44d000-7f102f44e000 ---p 00000000 00:00 0
7f102f44e000-7f102f4ef000 rw-p 00000000 00:00 0
7f102f4ef000-7f102f4f0000 ---p 00000000 00:00 0
7f102f4f0000-7f102f591000 rw-p 00000000 00:00 0
7f102f591000-7f102f592000 ---p 00000000 00:00 0
7f102f592000-7f102f633000 rw-p 00000000 00:00 0
7f102f633000-7f102f634000 ---p 00000000 00:00 0
7f102f634000-7f102f6d5000 rw-p 00000000 00:00 0
7f102f6d5000-7f102f6d6000 ---p 00000000 00:00 0
7f102f6d6000-7f102f777000 rw-p 00000000 00:00 0
7f102f777000-7f102f778000 ---p 00000000 00:00 0
7f102f778000-7f102f819000 rw-p 00000000 00:00 0
7f102f819000-7f102f81a000 ---p 00000000 00:00 0
7f102f81a000-7f102f8bb000 rw-p 00000000 00:00 0
7f102f8bb000-7f102f8bc000 ---p 00000000 00:00 0
7f102f8bc000-7f102f95d000 rw-p 00000000 00:00 0
7f102f95d000-7f102f95e000 ---p 00000000 00:00 0
7f102f95e000-7f102f9ff000 rw-p 00000000 00:00 0
7f102f9ff000-7f102fa00000 ---p 00000000 00:00 0
7f102fa00000-7f102faa1000 rw-p 00000000 00:00 0
7f102faa1000-7f102faa2000 ---p 00000000 00:00 0
7f102faa2000-7f102fb43000 rw-p 00000000 00:00 0
7f102fb43000-7f102fb44000 ---p 00000000 00:00 0
7f102fb44000-7f102fbe5000 rw-p 00000000 00:00 0
7f102fbe5000-7f102fbe6000 ---p 00000000 00:00 0
7f102fbe6000-7f102fc87000 rw-p 00000000 00:00 0
7f102fc87000-7f102fc88000 ---p 00000000 00:00 0
7f102fc88000-7f102fd29000 rw-p 00000000 00:00 0
7f102fd29000-7f102fd2a000 ---p 00000000 00:00 0
7f102fd2a000-7f102fdcb000 rw-p 00000000 00:00 0
7f102fdcb000-7f102fdcc000 ---p 00000000 00:00 0
7f102fdcc000-7f1031f77000 rw-p 00000000 00:00 0
7f1031f77000-7f1032541000 r--p 00000000 08:01 27920549                   /usr/lib/locale/locale-archive
7f1032541000-7f1032543000 rw-p 00000000 00:00 0
7f1032543000-7f1032552000 r--p 00000000 08:01 14419030                   /lib/x86_64-linux-gnu/libm-2.30.so
7f1032552000-7f10325f9000 r-xp 0000f000 08:01 14419030                   /lib/x86_64-linux-gnu/libm-2.30.so
7f10325f9000-7f1032690000 r--p 000b6000 08:01 14419030                   /lib/x86_64-linux-gnu/libm-2.30.so
7f1032690000-7f1032691000 r--p 0014c000 08:01 14419030                   /lib/x86_64-linux-gnu/libm-2.30.so
7f1032691000-7f1032692000 rw-p 0014d000 08:01 14419030                   /lib/x86_64-linux-gnu/libm-2.30.so
7f1032692000-7f1032693000 r--p 00000000 08:01 14418936                   /lib/x86_64-linux-gnu/libcrypt-2.30.so
7f1032693000-7f1032699000 r-xp 00001000 08:01 14418936                   /lib/x86_64-linux-gnu/libcrypt-2.30.so
7f1032699000-7f103269b000 r--p 00007000 08:01 14418936                   /lib/x86_64-linux-gnu/libcrypt-2.30.so
7f103269b000-7f103269c000 ---p 00009000 08:01 14418936                   /lib/x86_64-linux-gnu/libcrypt-2.30.so
7f103269c000-7f103269d000 r--p 00009000 08:01 14418936                   /lib/x86_64-linux-gnu/libcrypt-2.30.so
7f103269d000-7f103269e000 rw-p 0000a000 08:01 14418936                   /lib/x86_64-linux-gnu/libcrypt-2.30.so
7f103269e000-7f10326cc000 rw-p 00000000 00:00 0
7f10326cc000-7f10326cd000 r--p 00000000 08:01 14419029                   /lib/x86_64-linux-gnu/libdl-2.30.so
7f10326cd000-7f10326cf000 r-xp 00001000 08:01 14419029                   /lib/x86_64-linux-gnu/libdl-2.30.so
7f10326cf000-7f10326d0000 r--p 00003000 08:01 14419029                   /lib/x86_64-linux-gnu/libdl-2.30.so
7f10326d0000-7f10326d1000 r--p 00003000 08:01 14419029                   /lib/x86_64-linux-gnu/libdl-2.30.so
7f10326d1000-7f10326d2000 rw-p 00004000 08:01 14419029                   /lib/x86_64-linux-gnu/libdl-2.30.so
7f10326d2000-7f10326d4000 rw-p 00000000 00:00 0
7f10326d4000-7f10326de000 r--p 00000000 08:01 27922002                   /usr/lib/x86_64-linux-gnu/libgmp.so.10.3.2
7f10326de000-7f103273b000 r-xp 0000a000 08:01 27922002                   /usr/lib/x86_64-linux-gnu/libgmp.so.10.3.2
7f103273b000-7f1032752000 r--p 00067000 08:01 27922002                   /usr/lib/x86_64-linux-gnu/libgmp.so.10.3.2
7f1032752000-7f1032753000 ---p 0007e000 08:01 27922002                   /usr/lib/x86_64-linux-gnu/libgmp.so.10.3.2
7f1032753000-7f1032754000 r--p 0007e000 08:01 27922002                   /usr/lib/x86_64-linux-gnu/libgmp.so.10.3.2
7f1032754000-7f1032755000 rw-p 0007f000 08:01 27922002                   /usr/lib/x86_64-linux-gnu/libgmp.so.10.3.2
7f1032755000-7f1032758000 r--p 00000000 08:01 14421581                   /lib/x86_64-linux-gnu/librt-2.30.so
7f1032758000-7f103275c000 r-xp 00003000 08:01 14421581                   /lib/x86_64-linux-gnu/librt-2.30.so
7f103275c000-7f103275e000 r--p 00007000 08:01 14421581                   /lib/x86_64-linux-gnu/librt-2.30.so
7f103275e000-7f103275f000 r--p 00008000 08:01 14421581                   /lib/x86_64-linux-gnu/librt-2.30.so
7f103275f000-7f1032760000 rw-p 00009000 08:01 14421581                   /lib/x86_64-linux-gnu/librt-2.30.so
7f1032760000-7f1032767000 r--p 00000000 08:01 14421387                   /lib/x86_64-linux-gnu/libpthread-2.30.so
7f1032767000-7f1032778000 r-xp 00007000 08:01 14421387                   /lib/x86_64-linux-gnu/libpthread-2.30.so
7f1032778000-7f103277d000 r--p 00018000 08:01 14421387                   /lib/x86_64-linux-gnu/libpthread-2.30.so
7f103277d000-7f103277e000 r--p 0001c000 08:01 14421387                   /lib/x86_64-linux-gnu/libpthread-2.30.so
7f103277e000-7f103277f000 rw-p 0001d000 08:01 14421387                   /lib/x86_64-linux-gnu/libpthread-2.30.so
7f103277f000-7f1032783000 rw-p 00000000 00:00 0
7f1032783000-7f1032785000 r--p 00000000 08:01 14418340                   /lib/x86_64-linux-gnu/libz.so.1.2.11
7f1032785000-7f1032796000 r-xp 00002000 08:01 14418340                   /lib/x86_64-linux-gnu/libz.so.1.2.11
7f1032796000-7f103279c000 r--p 00013000 08:01 14418340                   /lib/x86_64-linux-gnu/libz.so.1.2.11
7f103279c000-7f103279d000 ---p 00019000 08:01 14418340                   /lib/x86_64-linux-gnu/libz.so.1.2.11
7f103279d000-7f103279e000 r--p 00019000 08:01 14418340                   /lib/x86_64-linux-gnu/libz.so.1.2.11
7f103279e000-7f103279f000 rw-p 0001a000 08:01 14418340                   /lib/x86_64-linux-gnu/libz.so.1.2.11
7f103279f000-7f10327c4000 r--p 00000000 08:01 14418935                   /lib/x86_64-linux-gnu/libc-2.30.so
7f10327c4000-7f103293c000 r-xp 00025000 08:01 14418935                   /lib/x86_64-linux-gnu/libc-2.30.so
7f103293c000-7f1032986000 r--p 0019d000 08:01 14418935                   /lib/x86_64-linux-gnu/libc-2.30.so
7f1032986000-7f1032989000 r--p 001e6000 08:01 14418935                   /lib/x86_64-linux-gnu/libc-2.30.so
7f1032989000-7f103298c000 rw-p 001e9000 08:01 14418935                   /lib/x86_64-linux-gnu/libc-2.30.so
7f103298c000-7f1032990000 rw-p 00000000 00:00 0
7f1032994000-7f1032996000 r--p 00000000 08:14 43391874                   /home/lars/.rvm/rubies/ruby-2.7.0/lib/ruby/2.7.0/x86_64-linux/io/console.so
7f1032996000-7f103299a000 r-xp 00002000 08:14 43391874                   /home/lars/.rvm/rubies/ruby-2.7.0/lib/ruby/2.7.0/x86_64-linux/io/console.so
7f103299a000-7f103299b000 r--p 00006000 08:14 43391874                   /home/lars/.rvm/rubies/ruby-2.7.0/lib/ruby/2.7.0/x86_64-linux/io/console.so
7f103299b000-7f103299c000 ---p 00007000 08:14 43391874                   /home/lars/.rvm/rubies/ruby-2.7.0/lib/ruby/2.7.0/x86_64-linux/io/console.so
7f103299c000-7f103299d000 r--p 00007000 08:14 43391874                   /home/lars/.rvm/rubies/ruby-2.7.0/lib/ruby/2.7.0/x86_64-linux/io/console.so
7f103299d000-7f103299e000 rw-p 00008000 08:14 43391874                   /home/lars/.rvm/rubies/ruby-2.7.0/lib/ruby/2.7.0/x86_64-linux/io/console.so
7f103299e000-7f10329a1000 r--p 00000000 08:14 43391807                   /home/lars/.rvm/rubies/ruby-2.7.0/lib/ruby/2.7.0/x86_64-linux/readline.so
7f10329a1000-7f10329a6000 r-xp 00003000 08:14 43391807                   /home/lars/.rvm/rubies/ruby-2.7.0/lib/ruby/2.7.0/x86_64-linux/readline.so
7f10329a6000-7f10329a8000 r--p 00008000 08:14 43391807                   /home/lars/.rvm/rubies/ruby-2.7.0/lib/ruby/2.7.0/x86_64-linux/readline.so
7f10329a8000-7f10329a9000 r--p 00009000 08:14 43391807                   /home/lars/.rvm/rubies/ruby-2.7.0/lib/ruby/2.7.0/x86_64-linux/readline.so
7f10329a9000-7f10329aa000 rw-p 0000a000 08:14 43391807                   /home/lars/.rvm/rubies/ruby-2.7.0/lib/ruby/2.7.0/x86_64-linux/readline.so
7f10329aa000-7f10329ab000 r--p 00000000 08:14 43391798                   /home/lars/.rvm/rubies/ruby-2.7.0/lib/ruby/2.7.0/x86_64-linux/monitor.so
7f10329ab000-7f10329ac000 r-xp 00001000 08:14 43391798                   /home/lars/.rvm/rubies/ruby-2.7.0/lib/ruby/2.7.0/x86_64-linux/monitor.so
7f10329ac000-7f10329ad000 r--p 00002000 08:14 43391798                   /home/lars/.rvm/rubies/ruby-2.7.0/lib/ruby/2.7.0/x86_64-linux/monitor.so
7f10329ad000-7f10329ae000 r--p 00002000 08:14 43391798                   /home/lars/.rvm/rubies/ruby-2.7.0/lib/ruby/2.7.0/x86_64-linux/monitor.so
7f10329ae000-7f10329af000 rw-p 00003000 08:14 43391798                   /home/lars/.rvm/rubies/ruby-2.7.0/lib/ruby/2.7.0/x86_64-linux/monitor.so
7f10329af000-7f10329b0000 r--p 00000000 08:14 43391848                   /home/lars/.rvm/rubies/ruby-2.7.0/lib/ruby/2.7.0/x86_64-linux/enc/trans/transdb.so
7f10329b0000-7f10329b2000 r-xp 00001000 08:14 43391848                   /home/lars/.rvm/rubies/ruby-2.7.0/lib/ruby/2.7.0/x86_64-linux/enc/trans/transdb.so
7f10329b2000-7f10329b3000 r--p 00003000 08:14 43391848                   /home/lars/.rvm/rubies/ruby-2.7.0/lib/ruby/2.7.0/x86_64-linux/enc/trans/transdb.so
7f10329b3000-7f10329b4000 r--p 00003000 08:14 43391848                   /home/lars/.rvm/rubies/ruby-2.7.0/lib/ruby/2.7.0/x86_64-linux/enc/trans/transdb.so
7f10329b4000-7f10329b5000 rw-p 00004000 08:14 43391848                   /home/lars/.rvm/rubies/ruby-2.7.0/lib/ruby/2.7.0/x86_64-linux/enc/trans/transdb.so
7f10329b5000-7f10329b6000 r--p 00000000 08:14 43391833                   /home/lars/.rvm/rubies/ruby-2.7.0/lib/ruby/2.7.0/x86_64-linux/enc/encdb.so
7f10329b6000-7f10329b7000 r-xp 00001000 08:14 43391833                   /home/lars/.rvm/rubies/ruby-2.7.0/lib/ruby/2.7.0/x86_64-linux/enc/encdb.so
7f10329b7000-7f10329b8000 r--p 00002000 08:14 43391833                   /home/lars/.rvm/rubies/ruby-2.7.0/lib/ruby/2.7.0/x86_64-linux/enc/encdb.so
7f10329b8000-7f10329b9000 r--p 00002000 08:14 43391833                   /home/lars/.rvm/rubies/ruby-2.7.0/lib/ruby/2.7.0/x86_64-linux/enc/encdb.so
7f10329b9000-7f10329ba000 rw-p 00003000 08:14 43391833                   /home/lars/.rvm/rubies/ruby-2.7.0/lib/ruby/2.7.0/x86_64-linux/enc/encdb.so
7f10329ba000-7f10329e7000 r--p 00000000 08:14 43391783                   /home/lars/.rvm/rubies/ruby-2.7.0/lib/libruby.so.2.7.0
7f10329e7000-7f1032c73000 r-xp 0002d000 08:14 43391783                   /home/lars/.rvm/rubies/ruby-2.7.0/lib/libruby.so.2.7.0
7f1032c73000-7f1032d6a000 r--p 002b9000 08:14 43391783                   /home/lars/.rvm/rubies/ruby-2.7.0/lib/libruby.so.2.7.0
7f1032d6a000-7f1032d70000 r--p 003af000 08:14 43391783                   /home/lars/.rvm/rubies/ruby-2.7.0/lib/libruby.so.2.7.0
7f1032d70000-7f1032d73000 rw-p 003b5000 08:14 43391783                   /home/lars/.rvm/rubies/ruby-2.7.0/lib/libruby.so.2.7.0
7f1032d73000-7f1032d90000 rw-p 00000000 00:00 0
7f1032d90000-7f1032d91000 r--p 00000000 08:01 14418882                   /lib/x86_64-linux-gnu/ld-2.30.so
7f1032d91000-7f1032db3000 r-xp 00001000 08:01 14418882                   /lib/x86_64-linux-gnu/ld-2.30.so
7f1032db3000-7f1032dbb000 r--p 00023000 08:01 14418882                   /lib/x86_64-linux-gnu/ld-2.30.so
7f1032dbc000-7f1032dbd000 r--p 0002b000 08:01 14418882                   /lib/x86_64-linux-gnu/ld-2.30.so
7f1032dbd000-7f1032dbe000 rw-p 0002c000 08:01 14418882                   /lib/x86_64-linux-gnu/ld-2.30.so
7f1032dbe000-7f1032dbf000 rw-p 00000000 00:00 0
7ffeeaaed000-7ffeeb2ec000 rw-p 00000000 00:00 0                          [stack]
7ffeeb306000-7ffeeb309000 r--p 00000000 00:00 0                          [vvar]
7ffeeb309000-7ffeeb30a000 r-xp 00000000 00:00 0                          [vdso]
ffffffffff600000-ffffffffff601000 --xp 00000000 00:00 0                  [vsyscall]


Abgebrochen (Speicherabzug geschrieben)
lars@isa:~/comcard/ffi$  git:(master) 3M 12A

[larskanis]

It turned out that issue is easily reproducible when GC.verify_compaction_references is called with the right arguments:

require "ffi"

class St < FFI::Struct
  layout  :i, :int
end

s = St.new
p GC.verify_compaction_references(toward: :empty, double_heap: true)[:moved]
s[:i]

Fails with:

lars@isa:~/comcard/ffi$  git:(master) 1M 13A ruby test-gc-compact.rb 
{:T_NONE=>0, :T_OBJECT=>758, :T_CLASS=>509, :T_MODULE=>15, :T_FLOAT=>0, :T_STRING=>8810, :T_REGEXP=>85, :T_ARRAY=>1381, :T_HASH=>85, :T_STRUCT=>11, :T_BIGNUM=>0, :T_FILE=>0, :T_DATA=>103, :T_MATCH=>0, :T_COMPLEX=>0, :T_RATIONAL=>0, 16=>0, :T_NIL=>0, :T_TRUE=>0, :T_FALSE=>0, :T_SYMBOL=>132, :T_FIXNUM=>0, :T_UNDEF=>0, 23=>0, 24=>0, 25=>0, :T_IMEMO=>5074, :T_NODE=>0, :T_ICLASS=>52, :T_ZOMBIE=>0, :T_MOVED=>0}
test-gc-compact.rb:9: [BUG] Segmentation fault at 0x0000000000000028
ruby 2.7.0p0 (2019-12-25 revision 647ee6f091) [x86_64-linux]

-- Control frame information -----------------------------------------------
c:0003 p:---- s:0012 e:000011 CFUNC  :[]
c:0002 p:0068 s:0007 E:000138 EVAL   test-gc-compact.rb:9 [FINISH]
c:0001 p:0000 s:0003 E:001e80 (none) [FINISH]

-- Ruby level backtrace information ----------------------------------------
test-gc-compact.rb:9:in `<main>'
test-gc-compact.rb:9:in `[]'

-- Machine register context ------------------------------------------------
 RIP: 0x00007fdd5f9090b3 RBP: 0x000055cf3b812af0 RSP: 0x00007ffdd1cbb470
 RAX: 0x0000000000000001 RBX: 0x000055cf3ba1b4d0 RCX: 0x0000000000000000
 RDX: 0x000055cf3b88dec0 RDI: 0x0000000000000000 RSI: 0x000000000026310c
  R8: 0x000055cf3b871f08  R9: 0x000000000000001f R10: 0x00007fdd63c9a4f0
 R11: 0x00007fdd63ab8b80 R12: 0x000000000026310c R13: 0x000055cf3b812a70
 R14: 0x000055cf3ba1b4d0 R15: 0x000055cf3b8c0a20 EFL: 0x0000000000010202

-- C level backtrace information -------------------------------------------
/home/lars/.rvm/rubies/ruby-2.7.0/lib/libruby.so.2.7(rb_vm_bugreport+0x573) [0x7fdd63b51a73] vm_dump.c:755
[0x7fdd63974dab]
/home/lars/.rvm/rubies/ruby-2.7.0/lib/libruby.so.2.7(sigsegv+0x4d) [0x7fdd63aae7cd] signal.c:946
/lib/x86_64-linux-gnu/libc.so.6(0x7fdd636d0470) [0x7fdd636d0470]
/home/lars/.rvm/gems/ruby-2.7.0/gems/ffi-1.12.1/lib/ffi_c.so(struct_aref+0x73) [0x7fdd5f9090b3] Struct.c:317
[0x7fdd63b29b00]
[0x7fdd63b3effb]
[0x7fdd63b3720b]
[0x7fdd63b3db64]
/home/lars/.rvm/rubies/ruby-2.7.0/lib/libruby.so.2.7(rb_ec_exec_node+0xc1) [0x7fdd639798e1] eval.c:277
/home/lars/.rvm/rubies/ruby-2.7.0/lib/libruby.so.2.7(ruby_run_node+0x4e) [0x7fdd6397f1fe] eval.c:335
/home/lars/.rvm/rubies/ruby-2.7.0/bin/ruby(main+0x5f) [0x55cf39b2217f] ./main.c:50

But after commit 6662bcc no segfault occurs any longer.