On Tue, Jun 19, 2018 at 10:14:38AM +0200, Paul Menzel wrote: > 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
After rebuilding Xwayland with these two patches, I can no longer reproduce the problem; sites that reliably triggered this issue in Firefox no longer do.
