[Python-modules-team] Bug#860663: Bug#860663: pytest: FTBFS on i386: segfault during tests

[Lucas Nussbaum]

On 19/04/17 at 22:15 +0200, Lucas Nussbaum wrote:
> On 19/04/17 at 20:42 +0200, Sebastian Ramacher wrote:
> > Control: tags -1 + moreinfo unreproducible
> > 
> > On 2017-04-19 09:26:48, Lucas Nussbaum wrote:
> > > Source: pytest
> > > Version: 3.0.6-1
> > > Severity: serious
> > > Tags: stretch sid
> > > User: debian-qa at lists.debian.org
> > > Usertags: qa-ftbfs-20170418-i386 qa-ftbfs
> > > Justification: FTBFS in stretch on i386
> > > 
> > > Hi,
> > > 
> > > During a rebuild of all packages in stretch (in a stretch chroot, not a
> > > sid chroot), your package failed to build on i386.
> > > 
> > > Relevant part (hopefully):
> > > > ../../../testing/test_pluginmanager.py ...........................
> > > > ../../../testing/test_pytester.py x.......
> > > > ../../../testing/test_recwarn.py ......................
> > > > ../../../testing/test_resultlog.py ...........
> > > > ../../../testing/test_runner.py ...................sssssss...ssss......x.......................
> > > > ../../../testing/test_runner_xunit.py ...............
> > > > ../../../testing/test_session.py .................
> > > > ../../../testing/test_skipping.py ..........................................................x..........
> > > > ../../../testing/test_terminal.py ..........s..........................s.............................................................
> > > > ../../../testing/test_tmpdir.py ...........s
> > > > ../../../testing/test_unittest.py ....................ssssssss................
> > > > ../../../testing/code/test_code.py ..............
> > > > ../../../testing/code/test_excinfo.py ............Segmentation fault
> > > > E: pybuild pybuild:283: test: plugin custom failed with: exit code=139: cd debian/tmp/test-working-directory && pypy -m pytest --lsof -rfsxX --ignore=/<<PKGBUILDDIR>>/testing/freeze --ignore=/<<PKGBUILDDIR>>/testing/test_entry_points.py --ignore=/<<PKGBUILDDIR>>/testing/test_pdb.py /<<PKGBUILDDIR>>/testing
> > > > dh_auto_test: pybuild --test -i pypy -p 5.6 --system=custom --test-args=cd debian/tmp/test-working-directory && {interpreter} -m pytest --lsof -rfsxX --ignore={dir}/testing/freeze --ignore={dir}/testing/test_entry_points.py --ignore={dir}/testing/test_pdb.py {dir}/testing returned exit code 13
> > > > debian/rules:20: recipe for target 'override_dh_auto_test' failed
> > 
> > I'm unable to reproduce the crash. Could you please provide a backtrace?
> 
> Can you provide a build log and diff it with mine?

I dug a bit more, and can say that:
- it also fails on a smaller EC2 instance, so it's not related to the
  fact that the first instance was quite powerful, many cores, etc.
- it also fails on a completely up-to-date jessie host (still with a
  stretch/i386 chroot) -- my kernel wasn't entirely up-to-date

I've generated a core file and put it at:
http://aws-logs.debian.net/2017/04/18/pypy-segfault.core.gz

The backtrace looks like:
#0  0xf553ba24 in pypy_g_handle_bytecode__AccessDirect_None () from /usr/lib/pypy/bin/libpypy-c.so
#1  0xf5b3282f in pypy_g_portal_5 () from /usr/lib/pypy/bin/libpypy-c.so
#2  0xf5e68bb4 in pypy_g_ll_portal_runner__Unsigned_Bool_pypy_interpreter () from /usr/lib/pypy/bin/libpypy-c.so
#3  0xf5b327d8 in pypy_g_PyFrame_dispatch () from /usr/lib/pypy/bin/libpypy-c.so
#4  0xf54e954e in pypy_g_execute_frame () from /usr/lib/pypy/bin/libpypy-c.so
#5  0xf636b801 in pypy_g_execute_frame_rvmprof.star_3 () from /usr/lib/pypy/bin/libpypy-c.so
#6  0xf54bc07c in pypy_g_PyFrame_run () from /usr/lib/pypy/bin/libpypy-c.so
#7  0xf5533573 in pypy_g_CALL_FUNCTION__AccessDirect_None () from /usr/lib/pypy/bin/libpypy-c.so
#8  0xf5537eba in pypy_g_dispatch_bytecode__AccessDirect_None () from /usr/lib/pypy/bin/libpypy-c.so
#9  0xf553ba29 in pypy_g_handle_bytecode__AccessDirect_None () from /usr/lib/pypy/bin/libpypy-c.so
#10 0xf5b3282f in pypy_g_portal_5 () from /usr/lib/pypy/bin/libpypy-c.so
#11 0xf5e68bb4 in pypy_g_ll_portal_runner__Unsigned_Bool_pypy_interpreter () from /usr/lib/pypy/bin/libpypy-c.so
#12 0xf5b327d8 in pypy_g_PyFrame_dispatch () from /usr/lib/pypy/bin/libpypy-c.so
#13 0xf54e954e in pypy_g_execute_frame () from /usr/lib/pypy/bin/libpypy-c.so
#14 0xf636b801 in pypy_g_execute_frame_rvmprof.star_3 () from /usr/lib/pypy/bin/libpypy-c.so
#15 0xf54bc07c in pypy_g_PyFrame_run () from /usr/lib/pypy/bin/libpypy-c.so
#16 0xf5533573 in pypy_g_CALL_FUNCTION__AccessDirect_None () from /usr/lib/pypy/bin/libpypy-c.so
#17 0xf5537eba in pypy_g_dispatch_bytecode__AccessDirect_None () from /usr/lib/pypy/bin/libpypy-c.so
#18 0xf553ba29 in pypy_g_handle_bytecode__AccessDirect_None () from /usr/lib/pypy/bin/libpypy-c.so

Lucas