Segmentation fault on Jenkins since Zope 5.11

[mauritsvanrees]

I upgraded coredev 6.1 to Zope 5.11 today in #959. All tests were reported as green. And indeed the robot tests passed, which is good news, but after that there was a segmentation fault. Actually there were two segmentation faults, one when running the non-robot tests, and one after running the robot tests.

So Jenkins did not properly report a problem. Maybe the segmentation fault is the cause.

As a start I will revert to Zope 5.10.

[mauritsvanrees]

You can trigger it with plone.app.testing:

$ bin/test -s plone.app.testing -u -t layers.rst
Running zope.testrunner.layer.UnitTests tests:
  Set up zope.testrunner.layer.UnitTests in 0.000 seconds.
  Running:
    1/1 (100.0%)Segmentation fault: 11

$ bin/test -s plone.app.testing -u -t helpers.rst
Running zope.testrunner.layer.UnitTests tests:
  Set up zope.testrunner.layer.UnitTests in 0.000 seconds.
  Running:
    1/1 (100.0%)Bus error: 10

[davisagli]

@mauritsvanrees Can't reproduce on my M1 Mac. Could you run the same command under gdb to get a C-level stack trace?

[mauritsvanrees]

I have not used gdb before, and don't have it installed.

But I tracked it down to zope.interface. When I downgrade this to 6.3 the segfault is gone. So it may be this problem:
zopefoundation/zope.interface#323

When I checkout zope.interface, it works again. But when I use tag 7.0.3 it also works. So it can be that the C code is not used in this case. I would need to look into how that works.

[davisagli]

@mauritsvanrees It's pretty simple, you just run gdb [command] and then if it segfaults you get more information.

Anyway, my money was on zope.interface. (Easy for me to place my bet after I know the answer!) There have been several different segfaults resulting from recent refactoring to support free-threading in Python 3.13. The most recent was just merged yesterday (zopefoundation/zope.interface#324) but not yet released so I expect that's why it works when you use a checkout.

[mauritsvanrees]

This is fixed in zope.interface 7.1.1 which I include here.