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Could not load module /usr/lib/libc.a on AIX #12

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tajila opened this issue Feb 8, 2016 · 5 comments
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Could not load module /usr/lib/libc.a on AIX #12

tajila opened this issue Feb 8, 2016 · 5 comments
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0.12

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@tajila
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tajila commented Feb 8, 2016

On AIX using JRuby v9.0.4 on a 32bit JVM, JRuby fails to start up because it is unable to load /usr/lib/libc.a. The following is the full stack trace.

Caused by:
java.lang.UnsatisfiedLinkError: Could not load module /usr/lib/libc.a.
    The module has an invalid magic number.
        loadNativeLibraries at jnr/ffi/provider/jffi/NativeLibrary.java:87
         getNativeLibraries at jnr/ffi/provider/jffi/NativeLibrary.java:70
           getSymbolAddress at jnr/ffi/provider/jffi/NativeLibrary.java:49
          findSymbolAddress at jnr/ffi/provider/jffi/NativeLibrary.java:59
      generateInterfaceImpl at jnr/ffi/provider/jffi/AsmLibraryLoader.java:117
                loadLibrary at jnr/ffi/provider/jffi/AsmLibraryLoader.java:59
                loadLibrary at jnr/ffi/provider/jffi/NativeLibraryLoader.java:43
                       load at jnr/ffi/LibraryLoader.java:290
                loadLibrary at jnr/ffi/Library.java:127
                loadLibrary at jnr/ffi/Library.java:82
                loadLibrary at jnr/ffi/Library.java:67
                   <clinit> at jnr/enxio/channels/Native.java:64
                       libc at jnr/enxio/channels/Native.java:69
                      write at jnr/enxio/channels/Native.java:112
                      write at jnr/enxio/channels/NativeDeviceChannel.java:86
                      write at org/jruby/util/io/PosixShim.java:102
                        run at org/jruby/util/io/OpenFile.java:1334
                        run at org/jruby/util/io/OpenFile.java:1325
                executeTask at org/jruby/RubyThread.java:1355
              writeInternal at org/jruby/util/io/OpenFile.java:2233
                   binwrite at org/jruby/util/io/OpenFile.java:2174
                     fwrite at org/jruby/util/io/OpenFile.java:2038
                      write at org/jruby/RubyIO.java:1438
                      write at org/jruby/RubyIO.java:1410
                    finvoke at org/jruby/RubyClass.java:756
                     invoke at org/jruby/runtime/Helpers.java:401
                       warn at org/jruby/RubyKernel.java:1174
               cacheAndCall at org/jruby/runtime/callsite/CachingCallSite.java:313
                       call at org/jruby/runtime/callsite/CachingCallSite.java:163
                processCall at org/jruby/ir/interpreter/InterpreterEngine.java:290
                  interpret at org/jruby/ir/interpreter/StartupInterpreterEngine.java:77
             INTERPRET_ROOT at org/jruby/ir/interpreter/Interpreter.java:102
                    execute at org/jruby/ir/interpreter/Interpreter.java:89
                    execute at org/jruby/ir/interpreter/Interpreter.java:32
                    execute at org/jruby/ir/IRTranslator.java:42
             runInterpreter at org/jruby/Ruby.java:837
                   loadFile at org/jruby/Ruby.java:2900
                       load at org/jruby/runtime/load/LibrarySearcher.java:236
                       load at org/jruby/runtime/load/LibrarySearcher.java:35
  tryLoadingLibraryOrScript at org/jruby/runtime/load/LoadService.java:896
          smartLoadInternal at org/jruby/runtime/load/LoadService.java:541
              requireCommon at org/jruby/runtime/load/LoadService.java:426
                    require at org/jruby/runtime/load/LoadService.java:392
              requireCommon at org/jruby/RubyKernel.java:946
                  require19 at org/jruby/RubyKernel.java:939
                       call at org/jruby/internal/runtime/methods/JavaMethod.java:380
               cacheAndCall at org/jruby/runtime/callsite/CachingCallSite.java:313
                       call at org/jruby/runtime/callsite/CachingCallSite.java:163
                processCall at org/jruby/ir/interpreter/InterpreterEngine.java:290
                  interpret at org/jruby/ir/interpreter/StartupInterpreterEngine.java:77
             INTERPRET_ROOT at org/jruby/ir/interpreter/Interpreter.java:102
                    execute at org/jruby/ir/interpreter/Interpreter.java:89
                    execute at org/jruby/ir/interpreter/Interpreter.java:32
                    execute at org/jruby/ir/IRTranslator.java:42
             runInterpreter at org/jruby/Ruby.java:837
                   loadFile at org/jruby/Ruby.java:2900
                       load at org/jruby/runtime/load/LibrarySearcher.java:236
                       load at org/jruby/runtime/load/LibrarySearcher.java:35
  tryLoadingLibraryOrScript at org/jruby/runtime/load/LoadService.java:896
          smartLoadInternal at org/jruby/runtime/load/LoadService.java:541
              requireCommon at org/jruby/runtime/load/LoadService.java:426
                    require at org/jruby/runtime/load/LoadService.java:392
              requireCommon at org/jruby/RubyKernel.java:946
                  require19 at org/jruby/RubyKernel.java:939
                       call at org/jruby/internal/runtime/methods/JavaMethod.java:380
               cacheAndCall at org/jruby/runtime/callsite/CachingCallSite.java:313
                       call at org/jruby/runtime/callsite/CachingCallSite.java:163
                processCall at org/jruby/ir/interpreter/InterpreterEngine.java:290
                  interpret at org/jruby/ir/interpreter/StartupInterpreterEngine.java:77
             INTERPRET_ROOT at org/jruby/ir/interpreter/Interpreter.java:102
                    execute at org/jruby/ir/interpreter/Interpreter.java:89
                    execute at org/jruby/ir/interpreter/Interpreter.java:32
                    execute at org/jruby/ir/IRTranslator.java:42
             runInterpreter at org/jruby/Ruby.java:837
                   loadFile at org/jruby/Ruby.java:2900
                       load at org/jruby/runtime/load/LibrarySearcher.java:236
                       load at org/jruby/runtime/load/LibrarySearcher.java:35
  tryLoadingLibraryOrScript at org/jruby/runtime/load/LoadService.java:896
          smartLoadInternal at org/jruby/runtime/load/LoadService.java:541
              requireCommon at org/jruby/runtime/load/LoadService.java:426
                    require at org/jruby/runtime/load/LoadService.java:392
              requireCommon at org/jruby/RubyKernel.java:946
                  require19 at org/jruby/RubyKernel.java:939
                       call at org/jruby/internal/runtime/methods/JavaMethod.java:380
               cacheAndCall at org/jruby/runtime/callsite/CachingCallSite.java:313
                       call at org/jruby/runtime/callsite/CachingCallSite.java:163
                processCall at org/jruby/ir/interpreter/InterpreterEngine.java:290
                  interpret at org/jruby/ir/interpreter/StartupInterpreterEngine.java:77
             INTERPRET_ROOT at org/jruby/ir/interpreter/Interpreter.java:102
                    execute at org/jruby/ir/interpreter/Interpreter.java:89
                    execute at org/jruby/ir/interpreter/Interpreter.java:32
                    execute at org/jruby/ir/IRTranslator.java:42
             runInterpreter at org/jruby/Ruby.java:837
                   loadFile at org/jruby/Ruby.java:2900
                       load at org/jruby/runtime/load/LibrarySearcher.java:236
                       load at org/jruby/runtime/load/LibrarySearcher.java:35
  tryLoadingLibraryOrScript at org/jruby/runtime/load/LoadService.java:896
          smartLoadInternal at org/jruby/runtime/load/LoadService.java:541
              requireCommon at org/jruby/runtime/load/LoadService.java:426
                    require at org/jruby/runtime/load/LoadService.java:392
              requireCommon at org/jruby/RubyKernel.java:946
                  require19 at org/jruby/RubyKernel.java:939
                       call at org/jruby/internal/runtime/methods/JavaMethod.java:380
               cacheAndCall at org/jruby/runtime/callsite/CachingCallSite.java:313
                       call at org/jruby/runtime/callsite/CachingCallSite.java:163
                processCall at org/jruby/ir/interpreter/InterpreterEngine.java:290
                  interpret at org/jruby/ir/interpreter/StartupInterpreterEngine.java:77
             INTERPRET_ROOT at org/jruby/ir/interpreter/Interpreter.java:102
                    execute at org/jruby/ir/interpreter/Interpreter.java:89
                    execute at org/jruby/ir/interpreter/Interpreter.java:32
                    execute at org/jruby/ir/IRTranslator.java:42
             runInterpreter at org/jruby/Ruby.java:837
                   loadFile at org/jruby/Ruby.java:2900
                       load at org/jruby/runtime/load/LibrarySearcher.java:236
                       load at org/jruby/runtime/load/LibrarySearcher.java:35
  tryLoadingLibraryOrScript at org/jruby/runtime/load/LoadService.java:896
          smartLoadInternal at org/jruby/runtime/load/LoadService.java:541
              requireCommon at org/jruby/runtime/load/LoadService.java:426
                    require at org/jruby/runtime/load/LoadService.java:392
              requireCommon at org/jruby/RubyKernel.java:946
                  require19 at org/jruby/RubyKernel.java:939
                       call at org/jruby/internal/runtime/methods/JavaMethod.java:380
               cacheAndCall at org/jruby/runtime/callsite/CachingCallSite.java:313
                       call at org/jruby/runtime/callsite/CachingCallSite.java:163
                processCall at org/jruby/ir/interpreter/InterpreterEngine.java:290
                  interpret at org/jruby/ir/interpreter/StartupInterpreterEngine.java:77
             INTERPRET_ROOT at org/jruby/ir/interpreter/Interpreter.java:102
                    execute at org/jruby/ir/interpreter/Interpreter.java:89
                    execute at org/jruby/ir/interpreter/Interpreter.java:32
                    execute at org/jruby/ir/IRTranslator.java:42
             runInterpreter at org/jruby/Ruby.java:837
                   loadFile at org/jruby/Ruby.java:2900
                       load at org/jruby/runtime/load/LibrarySearcher.java:236
                       load at org/jruby/runtime/load/LibrarySearcher.java:35
                       load at org/jruby/runtime/load/LoadService.java:336
                 loadCommon at org/jruby/RubyKernel.java:965
                     load19 at org/jruby/RubyKernel.java:957
                       call at org/jruby/internal/runtime/methods/DynamicMethod.java:201
                       call at org/jruby/internal/runtime/methods/DynamicMethod.java:197
               cacheAndCall at org/jruby/runtime/callsite/CachingCallSite.java:313
                       call at org/jruby/runtime/callsite/CachingCallSite.java:163
                processCall at org/jruby/ir/interpreter/InterpreterEngine.java:290
                  interpret at org/jruby/ir/interpreter/StartupInterpreterEngine.java:77
             INTERPRET_ROOT at org/jruby/ir/interpreter/Interpreter.java:102
                    execute at org/jruby/ir/interpreter/Interpreter.java:89
                    execute at org/jruby/ir/interpreter/Interpreter.java:32
                    execute at org/jruby/ir/IRTranslator.java:42
             runInterpreter at org/jruby/Ruby.java:837
                   loadFile at org/jruby/Ruby.java:2900
                       load at org/jruby/runtime/load/ExternalScript.java:58
        loadFromClassLoader at org/jruby/runtime/load/LoadService.java:362
             initRubyKernel at org/jruby/Ruby.java:1779
                       init at org/jruby/Ruby.java:1275
                newInstance at org/jruby/Ruby.java:330
                internalRun at org/jruby/Main.java:272
                        run at org/jruby/Main.java:233
                       main at org/jruby/Main.java:200

The cause of the problem is line 64 in jnr/enxio/channels/Native.java

static final LibC libc = Library.loadLibrary("c", LibC.class);

This ends up calling dlopen(..) with "/usr/lib/libc.a.". On AIX the correct way to do this is "/usr/lib/libc.a(shr.o)" for 32bit and "/usr/lib/libc.a(shr_64.o)" for 64bit.

I tried this on AIX6.1 and AIX7.1 using 32-bit IBM Java8 JDK.
@headius
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headius commented Mar 8, 2016

Can you help us modify this to search properly for shared objects on AIX?

@tajila
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tajila commented Mar 8, 2016

Sure, I can submit a pull request sometime before the end of the week.

This was referenced Mar 14, 2016
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@tajila
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tajila commented Mar 14, 2016

I should have mentioned, the #14 changes have a dependency on the jnr/jnr-ffi#60 changes.

@headius
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headius commented Mar 14, 2016

With these PRs, do you consider this issue resolved?

We probably should also make this change for https://github.com/jnr/jnr-posix.

@headius headius added this to the 0.12 milestone Mar 14, 2016
@tajila
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tajila commented Mar 14, 2016

Yes this specific issue is resolved. There is still another problem with startup on AIX 32-bit but it appears to be related to jruby/jruby#3495 (comment), so I will post some comments there.

@headius headius closed this as completed Mar 14, 2016
This was referenced Mar 14, 2016
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@headius headius mentioned this issue Apr 20, 2016
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