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Bug#901497: XWayland: Hard system hangs after upgrade from Mesa 18.0.5-1 to 18.1.1-1



Dear Josh, dear Tehnic, dear Mourad, dear Jacek,


On 06/16/18 22:37, Josh Triplett wrote:
> On Thu, Jun 14, 2018 at 11:59:20PM -0700, Josh Triplett wrote:
>> On Thu, Jun 14, 2018 at 11:56:03PM -0700, Josh Triplett wrote:
>>> reassign 901497
>>> retitle 901497 Xwayland: hangs spinning on write and SIGALRM
>>> thanks
>>>
>>> After further investigation, I can reproduce this with Mesa 18.0.5-1 as
>>> well, just not as often.
>>>
>>> After encountering this issue, I managed to switch to a text console,
>>> and found that Xwayland was using 100% CPU. strace of the running
>>> Xwayland produced the attached strace, in which Xwayland appears to be
>>> spinning, running a zero-byte writev, and periodically processing a
>>> SIGALRM. Other threads appear to be blocked on futexes.
>>
>> Forgot to attach the strace, sorry. Will provide one again next time it
>> happens, but it consisted entirely of "write(14, [], 0) = 0" on one
>> thread.
> 
> Here's a fresh strace. I'm encountering this quite frequently.

Could you please test if it’s the same issue as [1], and test the two
X.Org X server commits below [2]?

1.  https://cgit.freedesktop.org/xorg/xserver/commit/?id=3da999a
2.  https://cgit.freedesktop.org/xorg/xserver/commit/?id=4d5950c


Kind regards,

Paul


[1]: https://bugzilla.redhat.com/1579067
[2]: https://bugzilla.redhat.com/show_bug.cgi?id=1579067#c26

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