https://bugs.freedesktop.org/show_bug.cgi?id=97230

--- Comment #11 from Eero Tamminen <[email protected]> ---
(In reply to f.mach4 from comment #8)
> Created attachment 127912 [details]
> GDB full trace when MATLAB has hanged

Ok, so everything is in pthread_cond_wait(), except couple of threads that:
* wait accepting network connection
* epoll_wait() or poll() from network connection

And then there's a lock wait on display close:
Thread 57 (Thread 0x7ffab9873700 (LWP 19273)):
#0  0x00007ffb75116f1c in __lll_lock_wait () at /usr/lib/libpthread.so.0
#1  0x00007ffb75110b45 in pthread_mutex_lock () at /usr/lib/libpthread.so.0
#2  0x00007ffb6990d083 in  () at /usr/lib/libX11.so.6
#3  0x00007ffb69902698 in XFreeGC () at /usr/lib/libX11.so.6
#4  0x00007ffb698fcb5c in XCloseDisplay () at /usr/lib/libX11.so.6
#5  0x00007ffab8c68042 in
Java_jogamp_nativewindow_x11_X11Lib_XCloseDisplay(__complex) () at
/opt/MATLAB/R2016a/bin/glnxa64/libnativewindow_x11.so

Which I assume is the deadlock preventing Matlab from exiting?

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