Bug 939403 – dev-lang/python-3.13.0_rc2: fails one test with LTO on ppc64 (FAIL: test_recursion_limit (test.test_threading.ThreadingExceptionTests.test_recursion_limit))

• Status: UNCONFIRMED
• Product: Gentoo Linux

[Description Piotr Kubaj 2024-09-10 00:57:32 UTC]

Traceback (most recent call last):
  File "/var/tmp/portage/dev-lang/python-3.13.0_rc2/work/Python-3.13.0rc2/Lib/test/test_threading.py", line 1633, in test_recursion_limit
    self.assertEqual(p.returncode, 0, "Unexpected error: " + stderr.decode())
    ~~~~~~~~~~~~~~~~^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
AssertionError: -11 != 0 : Unexpected error: 


Reproducible: Always

[Comment 1 Piotr Kubaj 2024-09-10 00:58:34 UTC]

Created attachment 902497 [details]
emerge --info

[Comment 2 Piotr Kubaj 2024-09-10 01:00:01 UTC]

Created attachment 902498 [details]
build.log

[Comment 3 matoro 2024-09-10 06:44:58 UTC]

Does this still reproduce with:

* plain CFLAGS?  (-O2 -pipe)
* glibc?

[Comment 4 Piotr Kubaj 2024-09-10 11:57:15 UTC]

I'm not sure about glibc, but it seems like LTO is causing this error.

Still even with plain CFLAGS I'm getting another error:
ERROR: test_makedev (test.test_posix.PosixTester.test_makedev)
----------------------------------------------------------------------
Traceback (most recent call last):
  File "/var/tmp/portage/dev-lang/python-3.13.0_rc2/work/Python-3.13.0rc2/Lib/test/test_posix.py", line 730, in test_makedev
    self.assertEqual(posix.major(NODEV), NODEV)
                     ~~~~~~~~~~~^^^^^^^
OverflowError: can't convert negative int to unsigned

Should I report it as a separate bug?

[Comment 5 matoro 2024-09-10 14:55:07 UTC]

(In reply to Piotr Kubaj from comment #4)
> I'm not sure about glibc, but it seems like LTO is causing this error.
> 
> Still even with plain CFLAGS I'm getting another error:
> ERROR: test_makedev (test.test_posix.PosixTester.test_makedev)
> ----------------------------------------------------------------------
> Traceback (most recent call last):
>   File
> "/var/tmp/portage/dev-lang/python-3.13.0_rc2/work/Python-3.13.0rc2/Lib/test/
> test_posix.py", line 730, in test_makedev
>     self.assertEqual(posix.major(NODEV), NODEV)
>                      ~~~~~~~~~~~^^^^^^^
> OverflowError: can't convert negative int to unsigned
> 
> Should I report it as a separate bug?

Yes, separate failure needs to be a separate bug.

Can you remove all of the extra flags and try with just plain flags plus -flto=auto?  A lot of those come from the old lto-overlay which is supposed to be no longer necessary.

[Comment 6 Piotr Kubaj 2024-09-11 10:05:21 UTC]

-O2 -pipe -flto=auto also fails.