crashed on channel_stack.cc:177

[0oneo]

Should this be an issue in the gRPC issue tracker?

Yes

What version of gRPC and what language are you using?

objective-c

What operating system (Linux, Windows, …) and version?

iOS

What runtime / compiler are you using (e.g. python version or version of gcc)

Clang

What did you do?

Test GRPC stablity online

What did you expect to see?

not crash

What did you see instead?

low rate crash

Crashed: com.apple.root.default-qos EXC_BAD_ACCESS KERN_INVALID_ADDRESS 0x6e6576650000001a

Crashed: com.apple.root.default-qos
0  myapp                          0x100f3d02c grpc_call_stack_init (channel_stack.cc:177)
1  myapp                          0x100f8b46c grpc_connected_subchannel_create_call (subchannel.cc:767)
2  myapp                          0x100f48bcc pick_done_locked(grpc_exec_ctx*, grpc_call_element*, grpc_error*) (client_channel.cc:1014)
3  myapp                          0x100f4b588 grpc_combiner_continue_exec_ctx (combiner.cc:261)
4  myapp                          0x100f56e94 grpc_exec_ctx_flush (exec_ctx.cc:93)
5  myapp                          0x100f5477c pollset_work(grpc_exec_ctx*, grpc_pollset*, grpc_pollset_worker**, long) (ev_poll_posix.cc:1057)
6  myapp                          0x100f4c840 cq_next(grpc_completion_queue*, gpr_timespec, void*) (completion_queue.cc:952)
7  myapp                          0x100f30450 __27-[GRPCCompletionQueue init]_block_invoke_2 (GRPCCompletionQueue.m:56)
8  libdispatch.dylib              0x190cf69e0 _dispatch_call_block_and_release + 24
9  libdispatch.dylib              0x190cf69a0 _dispatch_client_callout + 16
10 libdispatch.dylib              0x190d050d4 _dispatch_queue_override_invoke + 644
11 libdispatch.dylib              0x190d06a50 _dispatch_root_queue_drain + 540
12 libdispatch.dylib              0x190d067d0 _dispatch_worker_thread3 + 124
13 libsystem_pthread.dylib        0x190eff100 _pthread_wqthread + 1096
14 libsystem_pthread.dylib        0x190efecac start_wqthread + 4

Make sure you include information that can help us debug (full error message, exception listing, stack trace, logs).

Anything else we should know about your project / environment?

no

[mehrdada]

Can you please try v1.9.1 and see if you can reproduce anything like this. I suspect all of these issues are related to #13327 for which a fix is deployed in 1.9.1.

[0oneo]

OK，I will give it a try, later will post the production result

[srini100]

Please reopen if #13327 doesn't fix this issue.