[llvm-bugs] [Bug 51403] New: [openmp] runtime/test/affinity/Output/redetect.c test hangs

via llvm-bugs llvm-bugs at lists.llvm.org
Sat Aug 7 11:35:44 PDT 2021 

https://bugs.llvm.org/show_bug.cgi?id=51403

            Bug ID: 51403
           Summary: [openmp] runtime/test/affinity/Output/redetect.c test
                    hangs
           Product: OpenMP
           Version: unspecified
          Hardware: PC
                OS: Linux
            Status: NEW
          Severity: normal
          Priority: P
         Component: Runtime Library
          Assignee: unassignedbugs at nondot.org
          Reporter: mgorny at gentoo.org
                CC: jonathan.l.peyton at intel.com, llvm-bugs at lists.llvm.org
            Blocks: 51236

I can reliably reproduce this when building with GCC 11.2.0 and Clang
13.0.0-rc1, both when building with -O2 and -O0 -g.

This is on Linux 5.13.8, glibc 2.33, openmp release/13.x branch.

If I'm reading the backtraces right, it seems that the first thread is in
wait(), while all the remaining threads are waiting on a futex.


Process 3138661 stopped
* thread #1, name = 'redetect.c.tmp', stop reason = signal SIGSTOP
    frame #0: 0x00007fd256015d57 libc.so.6`__GI___wait4(pid=-1,
stat_loc=0x00007ffe95b5fbcc, options=0, usage=0x0000000000000000) at
wait4.c:30:10
  thread #2, name = 'redetect.c.tmp', stop reason = signal SIGSTOP
    frame #0: 0x00007fd25612a6c2
libpthread.so.0`__futex_abstimed_wait_common64(futex_word=0x00000000017e45a8,
expected=0, clockid=<unavailable>, abstime=0x0000000000000000,
private=<unavailable>, cancel=<unavailable>) at futex-internal.c:74:11
  thread #3, name = 'redetect.c.tmp', stop reason = signal SIGSTOP
    frame #0: 0x00007fd25612a6c2
libpthread.so.0`__futex_abstimed_wait_common64(futex_word=0x00000000017e73ac,
expected=0, clockid=<unavailable>, abstime=0x0000000000000000,
private=<unavailable>, cancel=<unavailable>) at futex-internal.c:74:11
  thread #4, name = 'redetect.c.tmp', stop reason = signal SIGSTOP
    frame #0: 0x00007fd25612a6c2
libpthread.so.0`__futex_abstimed_wait_common64(futex_word=0x00000000017ea168,
expected=0, clockid=<unavailable>, abstime=0x0000000000000000,
private=<unavailable>, cancel=<unavailable>) at futex-internal.c:74:11
  thread #5, name = 'redetect.c.tmp', stop reason = signal SIGSTOP
    frame #0: 0x00007fd25612a6c2
libpthread.so.0`__futex_abstimed_wait_common64(futex_word=0x00000000017ecf6c,
expected=0, clockid=<unavailable>, abstime=0x0000000000000000,
private=<unavailable>, cancel=<unavailable>) at futex-internal.c:74:11
  thread #6, name = 'redetect.c.tmp', stop reason = signal SIGSTOP
    frame #0: 0x00007fd25612a6c2
libpthread.so.0`__futex_abstimed_wait_common64(futex_word=0x00000000017efd6c,
expected=0, clockid=<unavailable>, abstime=0x0000000000000000,
private=<unavailable>, cancel=<unavailable>) at futex-internal.c:74:11
  thread #7, name = 'redetect.c.tmp', stop reason = signal SIGSTOP
    frame #0: 0x00007fd25612a6c2
libpthread.so.0`__futex_abstimed_wait_common64(futex_word=0x00000000017f2b6c,
expected=0, clockid=<unavailable>, abstime=0x0000000000000000,
private=<unavailable>, cancel=<unavailable>) at futex-internal.c:74:11
  thread #8, name = 'redetect.c.tmp', stop reason = signal SIGSTOP
    frame #0: 0x00007fd25612a6c2
libpthread.so.0`__futex_abstimed_wait_common64(futex_word=0x00000000017f5928,
expected=0, clockid=<unavailable>, abstime=0x0000000000000000,
private=<unavailable>, cancel=<unavailable>) at futex-internal.c:74:11
  thread #9, name = 'redetect.c.tmp', stop reason = signal SIGSTOP
    frame #0: 0x00007fd25612a6c2
libpthread.so.0`__futex_abstimed_wait_common64(futex_word=0x00000000017f8728,
expected=0, clockid=<unavailable>, abstime=0x0000000000000000,
private=<unavailable>, cancel=<unavailable>) at futex-internal.c:74:11
  thread #10, name = 'redetect.c.tmp', stop reason = signal SIGSTOP
    frame #0: 0x00007fd25612a6c2
libpthread.so.0`__futex_abstimed_wait_common64(futex_word=0x00000000017fb528,
expected=0, clockid=<unavailable>, abstime=0x0000000000000000,
private=<unavailable>, cancel=<unavailable>) at futex-internal.c:74:11
  thread #11, name = 'redetect.c.tmp', stop reason = signal SIGSTOP
    frame #0: 0x00007fd25612a6c2
libpthread.so.0`__futex_abstimed_wait_common64(futex_word=0x00000000017fe328,
expected=0, clockid=<unavailable>, abstime=0x0000000000000000,
private=<unavailable>, cancel=<unavailable>) at futex-internal.c:74:11
  thread #12, name = 'redetect.c.tmp', stop reason = signal SIGSTOP
    frame #0: 0x00007fd25612a6c2
libpthread.so.0`__futex_abstimed_wait_common64(futex_word=0x00000000018010e8,
expected=0, clockid=<unavailable>, abstime=0x0000000000000000,
private=<unavailable>, cancel=<unavailable>) at futex-internal.c:74:11
Executable module set to
"/tmp/portage/sys-libs/libomp-13.0.0.9999/work/libomp-13.0.0.9999_build-abi_x86_64.amd64/runtime/test/affinity/Output/redetect.c.tmp".

(lldb) bt
error: libc.so.6 {0x00005c83}: DIE has DW_AT_ranges(DW_FORM_sec_offset 0x42)
attribute, but range extraction failed (invalid range list offset 0x42), please
file a bug and attach the file at the start of this error message
error: libc.so.6 {0x00005e0f}: DIE has DW_AT_ranges(DW_FORM_sec_offset 0x37)
attribute, but range extraction failed (invalid range list offset 0x37), please
file a bug and attach the file at the start of this error message
* thread #1, name = 'redetect.c.tmp', stop reason = signal SIGSTOP
  * frame #0: 0x00007fd256015d57 libc.so.6`__GI___wait4(pid=-1,
stat_loc=0x00007ffe95b5fbcc, options=0, usage=0x0000000000000000) at
wait4.c:30:10
    frame #1: 0x0000000000401762 redetect.c.tmp`main + 562
    frame #2: 0x00007fd255f717fd
libc.so.6`__libc_start_main(main=(redetect.c.tmp`main), argc=1,
argv=0x00007ffe95b600e8, init=<unavailable>, fini=<unavailable>,
rtld_fini=<unavailable>, stack_end=0x00007ffe95b600d8) at libc-start.c:332:16
    frame #3: 0x00000000004011aa redetect.c.tmp`_start + 42

(lldb) thread select 2 
* thread #2, name = 'redetect.c.tmp', stop reason = signal SIGSTOP
    frame #0: 0x00007fd25612a6c2
libpthread.so.0`__futex_abstimed_wait_common64(futex_word=0x00000000017e45a8,
expected=0, clockid=<unavailable>, abstime=0x0000000000000000,
private=<unavailable>, cancel=<unavailable>) at futex-internal.c:74:11
(lldb) bt
* thread #2, name = 'redetect.c.tmp', stop reason = signal SIGSTOP
  * frame #0: 0x00007fd25612a6c2
libpthread.so.0`__futex_abstimed_wait_common64(futex_word=0x00000000017e45a8,
expected=0, clockid=<unavailable>, abstime=0x0000000000000000,
private=<unavailable>, cancel=<unavailable>) at futex-internal.c:74:11
    frame #1: 0x00007fd256123ebf
libpthread.so.0`__pthread_cond_wait(cond=0x00000000017e4580,
mutex=0x00000000017e45c0) at pthread_cond_wait.c:504:10
    frame #2: 0x00007fd25620790d libomp.so`void
__kmp_suspend_template<kmp_flag_64<false, true> >(th_gtid=9,
flag=0x00007fd255ef3e80) at z_Linux_util.cpp:1474:16
    frame #3: 0x00007fd25620c5eb libomp.so`void __kmp_suspend_64<false,
true>(th_gtid=9, flag=0x00007fd255ef3e80) at z_Linux_util.cpp:1526:3
    frame #4: 0x00007fd2561c04fb libomp.so`kmp_flag_64<false,
true>::suspend(this=0x00007fd255ef3e80, th_gtid=9) at kmp_wait_release.h:906:31
    frame #5: 0x00007fd2561bc33a libomp.so`bool
__kmp_wait_template<kmp_flag_64<false, true>, true, false,
true>(this_thr=0x00000000017e4100, flag=0x00007fd255ef3e80,
itt_sync_obj=0x0000000000000000) at kmp_wait_release.h:448:13
    frame #6: 0x00007fd2561c037a libomp.so`kmp_flag_64<false,
true>::wait(this=0x00007fd255ef3e80, this_thr=0x00000000017e4100, final_spin=1,
itt_sync_obj=0x0000000000000000) at kmp_wait_release.h:921:14
    frame #7: 0x00007fd2561b8237
libomp.so`__kmp_hyper_barrier_release(bt=bs_forkjoin_barrier,
this_thr=0x00000000017e4100, gtid=9, tid=-2, propagate_icvs=1,
itt_sync_obj=0x0000000000000000) at kmp_barrier.cpp:649:10
    frame #8: 0x00007fd2561bb891 libomp.so`__kmp_fork_barrier(gtid=9, tid=-2)
at kmp_barrier.cpp:1938:5
    frame #9: 0x00007fd2561836f3
libomp.so`::__kmp_launch_thread(this_thr=0x00000000017e4100) at
kmp_runtime.cpp:5814:5
    frame #10: 0x00007fd2562053a2
libomp.so`__kmp_launch_worker(thr=0x00000000017e4100) at
z_Linux_util.cpp:527:14
    frame #11: 0x00007fd25611de1e
libpthread.so.0`start_thread(arg=0x00007fd255ef4ac0) at pthread_create.c:481:8
    frame #12: 0x00007fd25604916f libc.so.6`__clone at clone.S:95


Referenced Bugs:

https://bugs.llvm.org/show_bug.cgi?id=51236
[Bug 51236] [meta] 13.0.0 Release Blockers
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