[Octave-bug-tracker] [bug #56143] gui hangs on osx when switching between windows

[Andrew Janke]

Follow-up Comment #6, bug #56143 (project octave):

> do i get that from running `port installed`?

Yep, that's what I was interested in.

Here's "octave 5.1.0 hang on launch spindumps - 2019-04-16.zip" which contains
spindumps from eflister and another user who reported Octave.app 5.1.0 hangs.
https://github.com/octave-app/octave-app/files/3088267/octave.5.1.0.hang.on.launch.spindumps.-.2019-04-16.zip
(Too big to attach on Savannah.) Maybe these will help in the diagnosis. I've
edited the files down to just the Octave-related processes, for readability.

Both of these spindumps are from when a hang occurred on program launch. They
seem superficially similar. In both, in octave-gui, the DispatchThread seems
to be wedged in the keypress handler for the terminal emulation in octgui,
which I believe is the Command Window. SelfListener and QFileInfoGatherer both
appear to be waiting on a QMutex, and QThread is stopped in a system call
inside readline getting some input for the command window. I don't know Qt
programming or the Octave codebase well enough to know what that means.

Downstream bug report is here:
https://github.com/octave-app/octave-app/issues/24

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