STINNER Victor <vstin...@python.org> added the comment:

> Is currently anybody actively working on this? Please, report what you have 
> found out, if so. I'd like to start digging into this tomorrow and possibly 
> avoid any duplicit work.

I tried but failed to reproduce the bug on Fedora 31 and Fedora Rawhide.

I tested 3.8 and master development branches on Fedora 31 x86-64 laptop: 
"./configure --with-pydebug CFLAGS=-O0 && make && ./python -m test -v 
test_zipfile" pass.

I tested Python 3.9.0a3 on my up-to-date Fedora Rawhide x86-64 VM: "./configure 
--with-pydebug CFLAGS=-O0 && make && ./python -m test -v test_zipfile" pass. I 
also tried to install Python in /opt/py39 and run tests using 
/opt/py39/bin/python3.9: the test still pass.

I also tested Python 3.9.0a3 on an up-to-date Fedora Rawhide ppc64 mock 
container: Python configured as the Fedora package does (LTO, PGO, CFLAGS, 
LDFLAGS, etc.). test_zipfile pass as well.

Since I cannot reproduce the issue, nor access a machine which the bug occurs, 
I don't know how to debug this issue.

Can I get access to "s390x Fedora Rawhide 3.x" buildbot worker?

I didn't try to rebuild Python using the Fedora specfile. I only built Python 
manually.

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<https://bugs.python.org/issue39460>
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