My first question here, tell me if I am doing things wrong.

My problem

I am writing a module using Numba. Of course I have run accross a segfault, and I can't find where it comes from. So I am trying to debug it using gdb from Numba, but it does not work: the segfault is raised but I get no information from where it comes from:

[Reading symbols]
28  ../sysdeps/unix/sysv/linux/nanosleep.c: Aucun fichier ou dossier de ce type.
0x00007feacc67ea30 in __GI___nanosleep (requested_time=0x7ffdfe227510, 
    remaining=0x7ffdfe227510) at ../sysdeps/unix/sysv/linux/nanosleep.c:28
Breakpoint 1 at 0x7fea9d234150: file numba/_helperlib.c, line 1131.
Continuing.
double free or corruption (!prev)
51  ../sysdeps/unix/sysv/linux/raise.c: Aucun fichier ou dossier de ce type.

Program received signal SIGABRT, Aborted.
__GI_raise (sig=sig@entry=6) at ../sysdeps/unix/sysv/linux/raise.c:51
(gdb) 

During the gdb initialisation, this is also printed in stderr:

attach: No such file or directory.

Note that I have already managed the ptrace problem mentioned here by setting kernel.yama.ptrace_scope=0

Reproducing Numba's debug example

I don't know if it counts as a working reproducer, but I tried to run the example from the Numba documentation that I mentionned earlier :

  from numba import njit, gdb_init
  import numpy as np

  @njit(debug=True)
  def foo(a, index):
      gdb_init() # instruct Numba to attach gdb at this location, but not to pause execution
      b = a + 1
      c = a * 2.34
      d = c[index] # access an address that is a) invalid b) out of the page
      print(a, b, c, d)

  bad_index = int(1e9) # this index is invalid
  z = np.arange(10)
  r = foo(z, bad_index)
  print(r)

And I can't get the same output as they do:

[Reading symbols]
0x00007efcb5a60a30 in __GI___nanosleep (requested_time=0x7ffff4990f70, 
    remaining=0x7ffff4990f70) at ../sysdeps/unix/sysv/linux/nanosleep.c:28
28  ../sysdeps/unix/sysv/linux/nanosleep.c: Aucun fichier ou dossier de ce type.
Breakpoint 1 at 0x7efcabf3d150: file numba/_helperlib.c, line 1131.
Continuing.
Traceback (most recent call last):
  File "/home/.../test_segfault.py", line 16, in <module>
    r = foo(z, bad_index)
IndexError: index is out of bounds
[Inferior 1 (process 4299) exited with code 01]

My error message does not indicate me the exact line of the segfault, just the jitted function..

And again, I have this message, which may be the source of my problem..

attach: No such file or directory.

Could anyone help me make this work ?

Or a link to an equivalent question ? I have found the documentation and forums really short when it comes to debugging Numba.

Or maybe alternative ways to trace a segfault in Numba jitted functions ?

Thank you for reading me, I hope it is understandable.