[Build 202412140459-4.3] openQA test fails in test_002_clipboard_300k

[marmarek]

Observation

openQA test in scenario qubesos-4.3-kernel-x86_64-system_tests_basic_vm_qrexec_gui@hw7 fails in
TC_30_Gui_daemon

Traceback (most recent call last):
  File "/usr/lib/python3.13/site-packages/qubes/tests/__init__.py", line 598, in cleanup_loop
    assert len(self.loop._selector.get_map()) == int(
           ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
        self.loop._ssock is not None
        ^^^^^^^^^^^^^^^^^^^^^^^^^^^^
    ), (
    ^
AssertionError: unexpected selector map entries: {4: SelectorKey(fileobj=4, fd=4, events=1, data=(<Handle BaseSelectorEventLoop._read_from_self()>, None)), 62: SelectorKey(fileobj=62, fd=62, events=1, data=(<Handle PidfdChildWatcher._do_wait()>, None))}

Test suite description

Reproducible

Fails since (at least) Build 202412140459-4.3 (current job)

Expected result

Last good: 202411241734-4.3 (or more recent)

Further details

Always latest result in this scenario: latest

[alimirjamali]

I have to study the QubesTestCase and its cleanup_loop to fully understand this. Is there a memory leak in INCR handling here?

[marmarek]

This looks like zenity is very slow with such a long text pasted. I have an idea for a fix.

[marmarek]

The error in the issue description says more or less that some process remained running after the test.
And it looks to be zenity (via qrexec) - the first one, used to copy data from.