STINNER Victor <vstin...@redhat.com> added the comment:

I don't see how test_idle runs the /usr/bin/xvfb-run command. First, it would 
be interesting to see what is the argument of the xvfb-run command and check if 
it does crash alone.

Can you please try to trace system calls using the following command and then 
attached the created trace file to this issue?

strace -f -o trace ./python -m test test_idle

> test_writelines (idlelib.idle_test.test_io.PseudeOutputFilesTest) ... 
> /usr/bin/xvfb-run: line 181:  3617 Segmentation fault      (core dumped) 
> DISPLAY=:$SERVERNUM XAUTHORITY=$AUTHFILE "$@" 2>&1

What are values of DISPLAY, SERVERNUM and AUTHFILE environment variables?

----------
nosy: +vstinner

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<https://bugs.python.org/issue34095>
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