Not sure I understand what bug I am supposed to report. I apologize if 
my message https://bugs.python.org/issue39502#msg361116.

I assume your comment re: time.localtime(91301504) comes from this bit 
of the test message (mtime_ns=91301504000000000).

Assuming our TZ used are different I am verifying AIX works correctly 
for the constant 91301504

root@x065:[/data/prj/python/python3-3.9]./python
Python 3.9.0a3+ (heads/master-dirty:78c7183f47, Feb  3 2020, 14:10:40) [C] on aix
Type "help", "copyright", "credits" or "license" for more information.
>>> import time

>>> time.gmtime(91301504)
time.struct_time(tm_year=1972, tm_mon=11, tm_mday=22, tm_hour=17, tm_min=31, tm_sec=44, tm_wday=2, tm_yday=327, tm_isdst=0)
>>> time.localtime(91301504)
time.struct_time(tm_year=1972, tm_mon=11, tm_mday=22, tm_hour=17, tm_min=31, tm_sec=44, tm_wday=2, tm_yday=327, tm_isdst=0)

root@x065:[/data/prj/python/python3-3.9]set | grep TZ
TZ=UTC0

Again, my apologies for the confusion: the message
"skipped 'Linux VFS/XFS kernel bug detected: mtime_ns=91301504000000000" only occurs when the test is run on a NFS
mount hosted by a SAN based on a Linux kernel.

When I specify --tempdir=/tmp (i.e., using jfs2 as filesystem) the test passes normally.

On 03/02/2020 09:40, STINNER Victor wrote:
> STINNER Victor <vstinner@python.org> added the comment:
>
>> test_add_file_after_2107 (test.test_zipfile.StoredTestsWithSourceFile) ... skipped 'Linux VFS/XFS kernel bug detected: mtime_ns=91301504000000000'
> AIX kernel seems to have a bug. You should report it to AIX.
>
>>>> time.localtime(91301504)
> time.struct_time(tm_year=1972, tm_mon=11, tm_mday=22, tm_hour=18, tm_min=31, tm_sec=44, tm_wday=2, tm_yday=327, tm_isdst=0)
>
> ----------
>
> _______________________________________
> Python tracker <report@bugs.python.org>
> <https://bugs.python.org/issue39502>
> _______________________________________
>