[Octave-bug-tracker] [bug #40693] GUI occasionally blocks on QClipboard when exiting

[Mike Miller]

Follow-up Comment #3, bug #40693 (project octave):

I managed to catch this in gdb. For what it's worth, here is what the stack
looks like while it is stuck in this waiting to exit state:


#0  0x00007f5a2b10f843 in select () at ../sysdeps/unix/syscall-template.S:81
#1  0x00007f5a2a5c6e38 in QX11Data::clipboardWaitForEvent (this=<optimized
out>, 
    address@hidden, address@hidden,
address@hidden, 
    address@hidden, address@hidden)
    at kernel/qclipboard_x11.cpp:596
#2  0x00007f5a2a5c9ac0 in QClipboard::event (this=<optimized out>,
e=<optimized out>)
    at kernel/qclipboard_x11.cpp:945
#3  0x00007f5a2a54b75c in QApplicationPrivate::notify_helper
(address@hidden, 
    address@hidden, address@hidden)
    at kernel/qapplication.cpp:4567
#4  0x00007f5a2a551dd0 in QApplication::notify (this=0x7fff1f1e5240,
receiver=0x1704360, 
    e=0x7fff1f1e5180) at kernel/qapplication.cpp:4353
#5  0x00007f5a29cd333d in QCoreApplication::notifyInternal
(this=0x7fff1f1e5240, 
    receiver=0x1704360, address@hidden) at
kernel/qcoreapplication.cpp:949
#6  0x00007f5a2a54c272 in sendEvent (event=0x7fff1f1e5180, receiver=<optimized
out>)
    at ../../include/QtCore/../../src/corelib/kernel/qcoreapplication.h:231
#7  QApplication::~QApplication (this=0x7fff1f1e5240, __in_chrg=<optimized
out>)
    at kernel/qapplication.cpp:1111
#8  0x00007f5a2e38d105 in octave_start_gui (argc=8, argv=<optimized out>, 
    start_gui=<optimized out>) at ../../libgui/src/octave-gui.cc:185
#9  0x00007f5a2b04f995 in __libc_start_main (main=0x400950 <main(int,
char**)>, argc=8, 
    ubp_av=0x7fff1f1e54e8, init=<optimized out>, fini=<optimized out>, 
    rtld_fini=<optimized out>, stack_end=0x7fff1f1e54d8) at libc-start.c:260
#10 0x00000000004009df in _start ()


Of course none of this looks like any of our code is responsible for this
problem, but I never saw this behavior until yesterday I think.

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