My program received signal SIGSEGV, Segmentation fault.
Its simplified structure looks like this:
```
void foo() {
...
writeln("done"); // saw this got printed!
}
int main() {
foo();
return 0;
}
```
So, just before the program exit, it failed. I suspect druntime
has a thread (maybe due to foreach parallel) cleanup bug
somewhere, which is unrelated to my own code. This kind of bug is
hard to re-produce, not sure if I should file an issue.
I'm using: LDC - the LLVM D compiler (1.30.0) on x86_64.
Under gdb, here is the threads info (for the record):
Thread 11 "xxx" received signal SIGSEGV, Segmentation fault.
[Switching to Thread 0x1555553df700 (LWP 36258)]
__GI___res_iclose (free_addr=true, statp=0x1555553dfdb8) at
res-close.c:103
103 res-close.c: No such file or directory.
(gdb) info threads
Id Target Id Frame
1 Thread 0x155555515000 (LWP 36244) "lt" 0x0000155550af1d2d
in __GI___pthread_timedjoin_ex (threadid=23456246527744,
thread_return=0x0, abstime=0x0, block=<optimized out>) at
pthread_join_common.c:89
* 11 Thread 0x1555553df700 (LWP 36258) "lt" __GI___res_iclose
(free_addr=true, statp=0x1555553dfdb8) at res-close.c:103
17 Thread 0x155544817700 (LWP 36264) "lt" 0x0000155550afac70
in __GI___nanosleep (requested_time=0x155544810e90,
remaining=0x155544810ea8) at
../sysdeps/unix/sysv/linux/nanosleep.c:28
(gdb) thread 1
[Switching to thread 1 (Thread 0x155555515000 (LWP 36244))]
#0 0x0000155550af1d2d in __GI___pthread_timedjoin_ex
(threadid=23456246527744, thread_return=0x0, abstime=0x0,
block=<optimized out>) at pthread_join_common.c:89
89 pthread_join_common.c: No such file or directory.
(gdb) where
#0 0x0000155550af1d2d in __GI___pthread_timedjoin_ex
(threadid=23456246527744, thread_return=0x0, abstime=0x0,
block=<optimized out>) at pthread_join_common.c:89
#1 0x0000555555fb94f8 in
core.thread.osthread.joinLowLevelThread(ulong) ()
#2 0x0000555555fd7210 in
_D4core8internal2gc4impl12conservativeQw3Gcx15stopScanThreadsMFNbZv ()
#3 0x0000555555fd3ae7 in
_D4core8internal2gc4impl12conservativeQw3Gcx4DtorMFZv ()
#4 0x0000555555fd3962 in
_D4core8internal2gc4impl12conservativeQw14ConservativeGC6__dtorMFZv ()
#5 0x0000555555fc2ce7 in rt_finalize2 ()
#6 0x0000555555fc0056 in rt_term ()
#7 0x0000555555fc0471 in
_D2rt6dmain212_d_run_main2UAAamPUQgZiZ6runAllMFZv ()
#8 0x0000555555fc0356 in _d_run_main2 ()
#9 0x0000555555fc01ae in _d_run_main ()
#10 0x0000555555840c02 in main (argc=2, argv=0x7fffffffe188) at
//home/zhou/project/ldc2-1.30.0-linux-x86_64/bin/../import/core/internal/entrypoint.d:42
#11 0x0000155550163b97 in __libc_start_main (main=0x555555840be0
<main>, argc=2, argv=0x7fffffffe188, init=<optimized out>,
fini=<optimized out>, rtld_fini=<optimized out>,
stack_end=0x7fffffffe178)
at ../csu/libc-start.c:310
#12 0x00005555556dccca in _start ()
(gdb) thread 11
[Switching to thread 11 (Thread 0x1555553df700 (LWP 36258))]
#0 __GI___res_iclose (free_addr=true, statp=0x1555553dfdb8) at
res-close.c:103
103 res-close.c: No such file or directory.
(gdb) where
#0 __GI___res_iclose (free_addr=true, statp=0x1555553dfdb8) at
res-close.c:103
#1 res_thread_freeres () at res-close.c:138
#2 0x00001555502de8c2 in __libc_thread_freeres () at
thread-freeres.c:29
#3 0x0000155550af0700 in start_thread (arg=0x1555553df700) at
pthread_create.c:476
#4 0x0000155550263a3f in clone () at
../sysdeps/unix/sysv/linux/x86_64/clone.S:95
(gdb) thread 17
[Switching to thread 17 (Thread 0x155544817700 (LWP 36264))]
#0 0x0000155550afac70 in __GI___nanosleep
(requested_time=0x155544810e90, remaining=0x155544810ea8) at
../sysdeps/unix/sysv/linux/nanosleep.c:28
28 ../sysdeps/unix/sysv/linux/nanosleep.c: No such file or
directory.
(gdb) where
#0 0x0000155550afac70 in __GI___nanosleep
(requested_time=0x155544810e90, remaining=0x155544810ea8) at
../sysdeps/unix/sysv/linux/nanosleep.c:28
#1 0x0000555555fb8c3b in
_D4core6thread8osthread6Thread5sleepFNbNiSQBo4time8DurationZv ()
#2 0x0000555555d9a0c2 in
_D4hunt4util8DateTimeQj25_sharedStaticCtor_L406_C5FZ9__lambda4MFZv () at home/zhou/.dub/packages/hunt-1.7.16/hunt/source/hunt/util/DateTime.d:430
#3 0x0000555555fb89f4 in thread_entryPoint ()
#4 0x0000155550af06db in start_thread (arg=0x155544817700) at
pthread_create.c:463
#5 0x0000155550263a3f in clone () at
../sysdeps/unix/sysv/linux/x86_64/clone.S:95
