Bug 924191 – media-libs/exempi: unaligned access causes dev-python/python-xmp-toolkit-2.0.2 to fails tests on sparc (test_file_to_dict (test.test_core_unit.UtilsTestCase.test_file_to_dict) ... Bus error)

• Status: CONFIRMED
• Product: Gentoo Linux

[Description matoro 2024-02-09 22:55:27 UTC]

Unaligned crash on this test.  Not a regression.

python3.11 -m unittest_or_fail discover -v
test_delete_property (test.test_core_unit.NegativeTestCases.test_delete_property)
Verify the deleting a phony property does not raise an exception. ... ok
test_delete_property_bad_schema (test.test_core_unit.NegativeTestCases.test_delete_property_bad_schema)
Specifying a bad schema trigger an exception. ... Unregistered schema namespace URI
ok
test_2bytes_codepoint (test.test_core_unit.UnicodeTestCase.test_2bytes_codepoint)
Verify that we can create and read back utf-8 where some characters ... ok
test_get_localized_text (test.test_core_unit.UnicodeTestCase.test_get_localized_text)
Verify that unicode string literals are properly interpreted. ... ok
test_libxmp_version (test.test_core_unit.UnicodeTestCase.test_libxmp_version)
Verify that the version attribute is accessible. ... ok
test_parse_from_str_3_bytes_per_codepoint (test.test_core_unit.UnicodeTestCase.test_parse_from_str_3_bytes_per_codepoint)
Verify that we can create and read back utf-8 where each character ... ok
test_xmpmeta_repr (test.test_core_unit.UnicodeTestCase.test_xmpmeta_repr)
Should be a str in both 2.x and 3.x ... ok
test_xmpmeta_str (test.test_core_unit.UnicodeTestCase.test_xmpmeta_str)
In 2.7, str must return a byte string.  In 3.x, it is a str. ... ok
test_xmpmeta_unicode_27 (test.test_core_unit.UnicodeTestCase.test_xmpmeta_unicode_27)
In 2.7, unicode(xmp) should return a unicode object. ... ok
test_file_to_dict (test.test_core_unit.UtilsTestCase.test_file_to_dict) ... /var/tmp/portage/dev-python/python-xmp-toolkit-2.0.2/temp/environment: line 2577:    87 Bus error               "${@}"

Reproducible: Always

[Comment 1 matoro 2024-02-09 22:56:34 UTC]

Created attachment 884643 [details]
build.log and emerge --info

[Comment 2 matoro 2024-02-09 23:41:59 UTC]

Created attachment 884644 [details]
gdb context and complete backtrace

Culprit code is actually in media-libs/exempi.  In fact they have aligned/unaligned routines, but the aligned ones are gated behind a check for Solaris, rather than a generic sparc check.

This is wrong as unaligned access is UB on all platforms.

[Comment 3 matoro 2024-02-09 23:59:52 UTC]

Created attachment 884645 [details]
UBSAN run

[Comment 4 matoro 2024-02-10 03:43:08 UTC]

Have opened an upstream PR to fix this https://gitlab.freedesktop.org/libopenraw/exempi/-/merge_requests/8