I try to profile a program with aarch64 gcc thread sanitizer. The program produces some tsan output messages, then certain threads (those with the findings?) just seem to stop. The process doesn't crash or so, just certain threads seem to be stuck in certain tsan functions forever. Example Callstack of a stuck thread:
User Stack:
[Switching to thread 166 (LWP 2663)]
#0 __sanitizer::__internal_syscall (arg6=0, arg5=0, arg4=0, arg3=2, arg2=0, arg1=548659793000, nr=98)
at /home/tcwg-buildslave/workspace/tcwg-make-release/builder_arch/amd64/label/tcwg-x86_64-build/target/aarch64-linux-gnu/snapshots/gcc.git~linaro-7.3-2018.05/libsanitizer/sanitizer_common/sanitizer_syscall_linux_aarch64.inc:111
111 /home/tcwg-buildslave/workspace/tcwg-make-release/builder_arch/amd64/label/tcwg-x86_64-build/target/aarch64-linux-gnu/snapshots/gcc.git~linaro-7.3-2018.05/libsanitizer/sanitizer_common/sanitizer_syscall_linux_aarch64.inc: No such file or directory.
(gdb) bt
#0 __sanitizer::__internal_syscall (arg6=0, arg5=0, arg4=0, arg3=2, arg2=0, arg1=548659793000, nr=98)
at /home/tcwg-buildslave/workspace/tcwg-make-release/builder_arch/amd64/label/tcwg-x86_64-build/target/aarch64-linux-gnu/snapshots/gcc.git~linaro-7.3-2018.05/libsanitizer/sanitizer_common/sanitizer_syscall_linux_aarch64.inc:111
#1 __sanitizer::BlockingMutex::Lock (this=this@entry=0x7fbeac0c68 <__tsan::thread_registry_placeholder+24>)
at /home/tcwg-buildslave/workspace/tcwg-make-release/builder_arch/amd64/label/tcwg-x86_64-build/target/aarch64-linux-gnu/snapshots/gcc.git~linaro-7.3-2018.05/libsanitizer/sanitizer_common/sanitizer_linux.cc:529
#2 0x0000007fbe7e15f4 in __sanitizer::GenericScopedLock<__sanitizer::BlockingMutex>::GenericScopedLock (mu=0x7fbeac0c68 <__tsan::thread_registry_placeholder+24>, this=<synthetic pointer>)
at /home/tcwg-buildslave/workspace/tcwg-make-release/builder_arch/amd64/label/tcwg-x86_64-build/target/aarch64-linux-gnu/snapshots/gcc.git~linaro-7.3-2018.05/libsanitizer/sanitizer_common/sanitizer_mutex.h:177
#3 __sanitizer::ThreadRegistry::FinishThread (this=0x7fbeac0c50 <__tsan::thread_registry_placeholder>, tid=171)
at /home/tcwg-buildslave/workspace/tcwg-make-release/builder_arch/amd64/label/tcwg-x86_64-build/target/aarch64-linux-gnu/snapshots/gcc.git~linaro-7.3-2018.05/libsanitizer/sanitizer_common/sanitizer_thread_registry.cc:251
#4 0x0000007fbe7c71a8 in __tsan::ThreadFinish (thr=thr@entry=0x7f1e09f280)
at /home/tcwg-buildslave/workspace/tcwg-make-release/builder_arch/amd64/label/tcwg-x86_64-build/target/aarch64-linux-gnu/snapshots/gcc.git~linaro-7.3-2018.05/libsanitizer/tsan/tsan_rtl_thread.cc:289
#5 0x0000007fbe771980 in __tsan::DestroyThreadState ()
at /home/tcwg-buildslave/workspace/tcwg-make-release/builder_arch/amd64/label/tcwg-x86_64-build/target/aarch64-linux-gnu/snapshots/gcc.git~linaro-7.3-2018.05/libsanitizer/tsan/tsan_interceptors.cc:831
#6 0x0000007fbe70ed6c in ?? () from /lib/libpthread.so.0
#7 0x0000007f2605d870 in ?? ()
Kernel Stack:
[<ffffff80080854c4>] __switch_to+0x80/0xbc
[<ffffff8008110b78>] futex_wait_queue_me+0xb0/0xcc
[<ffffff8008111680>] futex_wait+0xd0/0x1b8
[<ffffff8008112e64>] do_futex+0xd0/0x928
[<ffffff800811380c>] SyS_futex+0x150/0x154
[<ffffff80080832c0>] el0_svc_naked+0x34/0x38
[<ffffffffffffffff>] 0xffffffffffffffff