Terry J. Reedy <tjre...@udel.edu> added the comment:
I think we should first determine whether xvfb is required to get the segfault,
and second, where it fails.
Does
<python2> -m test.regrtest -v -m test_io test_idle
fail and fail in the same place, the 11th and last test run in the module? If
not, what about
xvfb-run <python2> -m ...?
In either case, inserting prints in 'test_writelines', which has multiple
asserts, should determine where it fails.
Test.test_idle checks that tkinter can imported, which in turn imports
_tkinter, which tries to connect to a windowing system. Running with xvfb
satisfies this. Test_idle finds and run the test modules in idlelib.idle_test.
Individual modules and classes somewhat redundantly import test.support and
check "requires('gui')". So IDLE gui tests, and, I am fairly sure, the
tkinter gui tests, also require -ugui or -uall to run.
Test_io is not a gui test, so does not need or run "requires('gui')", and hence
does not need -ugui. On the other hand, it imports PyShell, which imports
tkinter and _tkinter, and hence would need xvfb-run on a headless server, as
opposed to a workstation with screen. Erich, I assume you are running on the
latter.
----------
nosy: +terry.reedy
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<https://bugs.python.org/issue34095>
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