[Wayland-bugs] [Bug 93750] Xwayland crashes with SIGBUS when processing PutImage

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=93750

--- Comment #4 from Pekka Paalanen <ppaalanen at gmail.com> ---
(In reply to Jonas Ådahl from comment #2)
> One thing I noticed was that /run/user/1000/ was 100% full when SIGBUS was
> hit, but I couldn't see any error messages about failed allocation, but not
> sure that has anything to do with it.

I think this is the cause. For an explanation why a full fs causes a SIGBUS,
see:
http://cgit.freedesktop.org/wayland/wayland/commit/?id=011b6954031a25de8d9eb39631b6837553bb3cfb

Can you somehow check if the target memory is indeed mmapped from that fs and
if so, how does the file get created? This would allow a graceful failure at
least.

I think the next question would be whether the mmap is of the expected size,
and should something throttle/reclaim somewhere to avoid filling the fs.

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