[Octave-bug-tracker] [bug #61742] Crash on exit from threading

[anonymous]

URL:
  <https://savannah.gnu.org/bugs/?61742>

                 Summary: Crash on exit from threading
                 Project: GNU Octave
            Submitted by: None
            Submitted on: Wed 29 Dec 2021 05:40:49 PM UTC
                Category: Configuration and Build System
                Severity: 3 - Normal
                Priority: 5 - Normal
              Item Group: Build Failure
                  Status: None
             Assigned to: None
         Originator Name: 
        Originator Email: 
             Open/Closed: Open
                 Release: dev
         Discussion Lock: Any
        Operating System: GNU/Linux

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Details:

Documentation cannot be built with Octave 8 hg id 0ef88c485786. The problem is
something to do with threading.

This exits normally:

octave:1> exit


This exits normally:

octave:1> figure; exit


This crashes on exit:

octave:1> plot (1:10, 1:10, 'b.-'); exit
fatal: caught signal Segmentation fault -- stopping myself...
Segmentation fault (core dumped)


The above crash prevents figures from being made and therefore the
documentation cannot be built.

Saying "export OMP_NUM_THREADS=1" at the bash prompt stops it from crashing
and allows documentation to be built.

Once documentation is built, "make check" passes even on a fresh terminal
where OMP_NUM_THREADS is not even defined, so it is not clear what the problem
is.

This also affects libraries that use threading like BLAS:


octave:1> A = rand(100,100) - 0.5; A = (A ^ 3) .^ 3; [v,d] = eig(A);
octave:2> exit
fatal: caught signal Segmentation fault -- stopping myself...
Segmentation fault (core dumped)


After exporting OMP_NUM_THREADS=1, no crash on exit:

octave:1> A = rand(100,100) - 0.5; A = (A ^ 3) .^ 3; [v, d] = eig(A);
octave:2> exit


It only seems to crash on exit not during the computation.




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