https://gcc.gnu.org/bugzilla/show_bug.cgi?id=88707
--- Comment #2 from Iain Sandoe <iains at gcc dot gnu.org> ---
(on Darwin17 I had a recent build)
I find that a built exe fails quite often; here's a sample of the hung program
(it appears deadlocked, not consuming any CPU).
The correct libraries are being loaded.
Sampling process 23844 for 3 seconds with 1 millisecond of run time between
samples
Sampling completed, processing symbols...
Analysis of sampling task-reduction-10.exe (pid 23844) every 1 millisecond
Process: task-reduction-10.exe [23844]
Path:
/Volumes/scratch/10-13-his/gcc-trunk-gcc/x86_64-apple-darwin17/libgomp/testsuite/task-reduction-10.exe
Load Address: 0x108350000
Identifier: task-reduction-10.exe
Version: 0
Code Type: X86-64
Parent Process: bash [34246]
Date/Time: 2019-01-05 12:53:30.784 +0000
Launch Time: 2019-01-05 12:52:40.943 +0000
OS Version: Mac OS X 10.13.6 (17G4015)
Report Version: 7
Analysis Tool: /usr/bin/sample
Physical footprint: 568K
Physical footprint (peak): 576K
----
Call graph:
2799 Thread_58184392 DispatchQueue_1: com.apple.main-thread (serial)
+ 2799 ??? (in <unknown binary>) [0x7f9679c02718]
+ 2799 gomp_barrier_wait_end (in libgomp.1.dylib) + 86 [0x10862d606]
bar.c:92
+ 2799 gomp_sem_wait (in libgomp.1.dylib) + 40 [0x10862d488]
sem.c:71
+ 2799 _pthread_cond_wait (in libsystem_pthread.dylib) + 732
[0x7fff53677589]
+ 2799 __psynch_cvwait (in libsystem_kernel.dylib) + 10
[0x7fff534aea16]
2799 Thread_58184395
+ 2799 ??? (in <unknown binary>) [0x206000000000]
+ 2799 ??? (in <unknown binary>) [0x7f9679c02cb8]
+ 2799 gomp_barrier_wait_end (in libgomp.1.dylib) + 86 [0x10862d606]
bar.c:92
+ 2799 gomp_sem_wait (in libgomp.1.dylib) + 40 [0x10862d488]
sem.c:71
+ 2799 _pthread_cond_wait (in libsystem_pthread.dylib) + 732
[0x7fff53677589]
+ 2799 __psynch_cvwait (in libsystem_kernel.dylib) + 10
[0x7fff534aea16]
2799 Thread_58184397
+ 2799 ??? (in <unknown binary>) [0x206000000000]
+ 2799 ??? (in <unknown binary>) [0x7f9679c030b8]
+ 2799 gomp_barrier_wait_end (in libgomp.1.dylib) + 86 [0x10862d606]
bar.c:92
+ 2799 gomp_sem_wait (in libgomp.1.dylib) + 40 [0x10862d488]
sem.c:71
+ 2799 _pthread_cond_wait (in libsystem_pthread.dylib) + 732
[0x7fff53677589]
+ 2799 __psynch_cvwait (in libsystem_kernel.dylib) + 10
[0x7fff534aea16]
2799 Thread_58184398
+ 2799 ??? (in <unknown binary>) [0x206000000000]
+ 2799 ??? (in <unknown binary>) [0x7f9679c032b8]
+ 2799 gomp_barrier_wait_end (in libgomp.1.dylib) + 86 [0x10862d606]
bar.c:92
+ 2799 gomp_sem_wait (in libgomp.1.dylib) + 40 [0x10862d488]
sem.c:71
+ 2799 _pthread_cond_wait (in libsystem_pthread.dylib) + 732
[0x7fff53677589]
+ 2799 __psynch_cvwait (in libsystem_kernel.dylib) + 10
[0x7fff534aea16]
2799 Thread_58184399
+ 2799 ??? (in <unknown binary>) [0x206000000000]
+ 2799 ??? (in <unknown binary>) [0x7f9679c034b8]
+ 2799 gomp_barrier_wait_end (in libgomp.1.dylib) + 86 [0x10862d606]
bar.c:92
+ 2799 gomp_sem_wait (in libgomp.1.dylib) + 40 [0x10862d488]
sem.c:71
+ 2799 _pthread_cond_wait (in libsystem_pthread.dylib) + 732
[0x7fff53677589]
+ 2799 __psynch_cvwait (in libsystem_kernel.dylib) + 10
[0x7fff534aea16]
2799 Thread_58184400
+ 2799 ??? (in <unknown binary>) [0x206000000000]
+ 2799 ??? (in <unknown binary>) [0x7f9679d00118]
+ 2799 gomp_barrier_wait_end (in libgomp.1.dylib) + 86 [0x10862d606]
bar.c:92
+ 2799 gomp_sem_wait (in libgomp.1.dylib) + 40 [0x10862d488]
sem.c:71
+ 2799 _pthread_cond_wait (in libsystem_pthread.dylib) + 732
[0x7fff53677589]
+ 2799 __psynch_cvwait (in libsystem_kernel.dylib) + 10
[0x7fff534aea16]
2799 Thread_58184401
2799 ??? (in <unknown binary>) [0x206000000000]
2799 ??? (in <unknown binary>) [0x7f9679d00318]
2799 gomp_barrier_wait_end (in libgomp.1.dylib) + 86 [0x10862d606]
bar.c:92
2799 gomp_sem_wait (in libgomp.1.dylib) + 40 [0x10862d488]
sem.c:71
2799 _pthread_cond_wait (in libsystem_pthread.dylib) + 732
[0x7fff53677589]
2799 __psynch_cvwait (in libsystem_kernel.dylib) + 10
[0x7fff534aea16]
Total number in stack (recursive counted multiple, when >=5):
7 __psynch_cvwait (in libsystem_kernel.dylib) + 0
[0x7fff534aea0c]
7 _pthread_cond_wait (in libsystem_pthread.dylib) + 732
[0x7fff53677589]
7 gomp_barrier_wait_end (in libgomp.1.dylib) + 86 [0x10862d606]
bar.c:92
7 gomp_sem_wait (in libgomp.1.dylib) + 40 [0x10862d488]
sem.c:71
6 ??? (in <unknown binary>) [0x206000000000]
Sort by top of stack, same collapsed (when >= 5):
__psynch_cvwait (in libsystem_kernel.dylib) 19593
