One of the threads is waiting on a lock in Mir's
SystemCompositorWindowManager::add_display() - I see no other thread
touching that lock, and there's a bug in the lock handling of that
class. (See linked branch.)
The SystemCompositorWindowManager::remove_surface() bug may not be the
whole problem but needs to be eliminated.
** Branch linked: lp:~alan-griffiths/mir/fix-
SystemCompositorWindowManager-remove_surface
** Also affects: mir
Importance: Undecided
Status: New
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https://bugs.launchpad.net/bugs/1543594
Title:
unity-system-compositor locked up in __libc_do_syscall()
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