On Friday, November 27, 2015 1:05:26 PM CET Michael Pyne wrote: > On Thu, November 26, 2015 13:16:04 Martin Graesslin wrote: > > we are facing a problem during the startup of Plasma on Wayland. If OOM > > protection is enabled for kdeinit and we already have a running X server, > > kdeinit freezes dead. > > > > I'm sorry for having ignored the issue for too long and had just disabled > > OOM protection on my system, so I never hit it. Now I enabled it again to > > get the problem. On my system I have now two frozen kdeinit processes: > > > > martin 1960 1956 0 77832 26448 1 13:05 ? 00:00:00 > > /opt/kf5/bin/ kdeinit5 --oom-pipe 4 --kded +kcminit_startup > > martin 1961 1960 0 77832 2816 3 13:05 ? 00:00:00 > > /opt/kf5/bin/ kdeinit5 --oom-pipe 4 --kded +kcminit_startup > > > > One has the following stacktrace: > > It's frozen in this line of code: > > sigsuspend(&oldsigs); // wait for the signal to come > > > > The other one has the following stacktrace: > > which is: > > d.n = read(d.fd[0], &d.result, 1); > > > > Given that it looks to me like these two processes dead-lock. I do not > > understand why, why it only happens on Wayland, why the fact that an X > > server must already be running is relevant and what the OOM protection has > > to do with it. > > I don't have the answer but I can help explain the deadlock better I think.
thanks for your input. It helped me understanding quite a bit. Some more testing results: Weston+Xwayland: doesn't show the problem Weston without Xwayland (and DISPLAY=$WAYLAND_DISPLAY): doesn't show the problem. What I absolutely do not understand how KWin could influence it. From all the backtraces I see it always freezes before interacting with the windowing system. Any more ideas to test and investigate, highly appreciated. I got a rather high number of complaints due to that problem and it's a showstopper and I'm lost with it. Cheers Martin
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