[Starpu-devel] [segfault debugging]

[Maxim Abalenkov <maxim.abalenkov@gmail.com>]

Dear Samuel,

I hope all is well with you. I am struggling to debug a segmentation fault in my code. The gdb output is as follows:

Thread 4 "CPU 2" received signal SIGSEGV, Segmentation fault.
[Switching to Thread 0x7fffee2c4700 (LWP 3228)]
0x00007ffff736b039 in _starpu_notify_cg_list (successors=0x555555a2ec50) at core/dependencies/cg.c:262
262 unsigned cg_type = cg->cg_type;
(gdb) bt
#0  0x00007ffff736b039 in _starpu_notify_cg_list (successors=0x555555a2ec50) at core/dependencies/cg.c:262
#1  0x00007ffff73735ff in _starpu_notify_task_dependencies (j=0x555555a2ea90) at core/dependencies/task_deps.c:57
#2  0x00007ffff736b386 in _starpu_notify_dependencies (j=0x555555a2ea90) at core/dependencies/dependencies.c:33
#3  0x00007ffff735368c in _starpu_handle_job_termination (j=0x555555a2ea90) at core/jobs.c:375
#4  0x00007ffff744592d in _starpu_cpu_driver_run_once (cpu_worker=0x7ffff76d39d0 <_starpu_config+3376>) at drivers/cpu/driver_cpu.c:328
#5  0x00007ffff74459ef in _starpu_cpu_worker (arg=0x7ffff76d39d0 <_starpu_config+3376>) at drivers/cpu/driver_cpu.c:361
#6  0x00007ffff355808c in start_thread () from /usr/lib/libpthread.so.0
#7  0x00007ffff328fe7f in clone () from /usr/lib/libc.so.6

As I understand, something is wrong with the worker’s task dependencies. But I would like to find the line of __my__ code that is causing the trouble. Do you possibly know, how to find that out? The “backtrace (bt)” command is not helpful in this case. Thank you!

—

Best wishes,

Maxim

Maxim Abalenkov \\ maxim.abalenkov@gmail.com
+44 7 486 486 505 \\ http://mabalenk.gitlab.io