[kwin] [Bug 375971] kwin_wayland take 100% CPU

[Christoph Feck]

https://bugs.kde.org/show_bug.cgi?id=375971

Christoph Feck  changed:

   What|Removed |Added

 Status|CONFIRMED   |RESOLVED
 Resolution|--- |WORKSFORME

--- Comment #20 from Christoph Feck  ---
Thanks for the update; closing.

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[kwin] [Bug 375971] kwin_wayland take 100% CPU

[José Pekkarinen]

https://bugs.kde.org/show_bug.cgi?id=375971

--- Comment #19 from José Pekkarinen  ---
I'm already far from the versions this happened to me too, so not reproducing
anymore, it can be closed.

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[kwin] [Bug 375971] kwin_wayland take 100% CPU

[bugzilla_noreply]

https://bugs.kde.org/show_bug.cgi?id=375971

--- Comment #18 from tro...@free.fr ---
It stopped happening here too.

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[kwin] [Bug 375971] kwin_wayland take 100% CPU

[Mustafa Muhammad]

https://bugs.kde.org/show_bug.cgi?id=375971

--- Comment #17 from Mustafa Muhammad  ---
(In reply to Alexander Mentyu from comment #16)
> Is this issue still reproducible?

I don't think so, at least not for me, I don't mind closing it, it's your call.

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[kwin] [Bug 375971] kwin_wayland take 100% CPU

[Alexander Mentyu]

https://bugs.kde.org/show_bug.cgi?id=375971

Alexander Mentyu  changed:

   What|Removed |Added

 CC||notux...@gmail.com

--- Comment #16 from Alexander Mentyu  ---
Is this issue still reproducible?

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[kwin] [Bug 375971] kwin_wayland take 100% CPU

[Mustafa Muhammad]

https://bugs.kde.org/show_bug.cgi?id=375971

--- Comment #15 from Mustafa Muhammad  ---
(In reply to Martin Flöser from comment #14)
> What I need is to know where the problem happens. For that I ideally get a
> backtrace with debug symbols. Without that all is just guessing
> unfortunately.

I'll try to provide another backtrace with debug symbols (I think I already
provided one), but the session is very unstable these days (crash when I
traverse the menu), so maybe later.

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[kwin] [Bug 375971] kwin_wayland take 100% CPU

[Martin Flöser]

https://bugs.kde.org/show_bug.cgi?id=375971

--- Comment #14 from Martin Flöser  ---
What I need is to know where the problem happens. For that I ideally get a
backtrace with debug symbols. Without that all is just guessing unfortunately.

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[kwin] [Bug 375971] kwin_wayland take 100% CPU

[José Pekkarinen]

https://bugs.kde.org/show_bug.cgi?id=375971

José Pekkarinen  changed:

   What|Removed |Added

 CC||koali...@gmail.com

--- Comment #13 from José Pekkarinen  ---
Same here with gentoo, unmasking plasma 5.9.5. Is there any interesting info I
could share to ease the debugging? I'm afraid debugging symbols won't be there
either.

Thanks!

José.

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[kwin] [Bug 375971] kwin_wayland take 100% CPU

[Rex Dieter]

https://bugs.kde.org/show_bug.cgi?id=375971

Rex Dieter  changed:

   What|Removed |Added

 CC||rdie...@math.unl.edu

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[kwin] [Bug 375971] kwin_wayland take 100% CPU

[Andrei Amuraritei]

https://bugs.kde.org/show_bug.cgi?id=375971

Andrei Amuraritei  changed:

   What|Removed |Added

 Ever confirmed|0   |1
 CC||sird...@bydeiu.net
 Status|UNCONFIRMED |CONFIRMED

--- Comment #12 from Andrei Amuraritei  ---
Hi, I'm seeing this also on Fedora 25 x86_64 with Plasma 5.9.4, choosing the
wayland sesssion and logging in or starting a nested wayland session shows
kwin_wayland using 100% cpu.

This on a optimus Acer laptop (intel 530 skylake and nouveau for nvidia
gtx950m).

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[kwin] [Bug 375971] kwin_wayland take 100% CPU

[bugzilla_noreply]

https://bugs.kde.org/show_bug.cgi?id=375971

e.ekme...@gmail.com changed:

   What|Removed |Added

 CC||e.ekme...@gmail.com

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[kwin] [Bug 375971] kwin_wayland take 100% CPU

[bugzilla_noreply]

https://bugs.kde.org/show_bug.cgi?id=375971

tro...@free.fr changed:

   What|Removed |Added

 CC||tro...@free.fr

--- Comment #11 from tro...@free.fr ---
Getting this too. On Arch Linux, Plasma 5.9.3, Kwin_wayland suddenly took 100%
of one core of my CPU after a few hours of use.

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[kwin] [Bug 375971] kwin_wayland take 100% CPU

[Martin Gräßlin]

https://bugs.kde.org/show_bug.cgi?id=375971

--- Comment #10 from Martin Gräßlin  ---
> It is the same process, still running until now if you want something,
> maybe
> different timing can cause different gdb output :)

sure, sure. But if we have 100 % cpu usage cases, it's quite often, that 
gdb ends in the same area. Which is why I was interested in gdb in the 
first place. I just hoped, that it ends up always in the same spot - 
that would make investigating easier.

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[kwin] [Bug 375971] kwin_wayland take 100% CPU

[Mustafa Muhammad]

https://bugs.kde.org/show_bug.cgi?id=375971

--- Comment #9 from Mustafa Muhammad  ---
It is the same process, still running until now if you want something, maybe
different timing can cause different gdb output :)

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[kwin] [Bug 375971] kwin_wayland take 100% CPU

[Martin Gräßlin]

https://bugs.kde.org/show_bug.cgi?id=375971

--- Comment #8 from Martin Gräßlin  ---
It hit a completely different place. This time we don't have Wayland server
event loop in the backtrace.

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[kwin] [Bug 375971] kwin_wayland take 100% CPU

[Mustafa Muhammad]

https://bugs.kde.org/show_bug.cgi?id=375971

--- Comment #7 from Mustafa Muhammad  ---
Created attachment 103912
  --> https://bugs.kde.org/attachment.cgi?id=103912=edit
trace with debug packages installed

I installed all debug packages I could find in the file and generated a new
trace.

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[kwin] [Bug 375971] kwin_wayland take 100% CPU

[Martin Gräßlin]

https://bugs.kde.org/show_bug.cgi?id=375971

--- Comment #6 from Martin Gräßlin  ---
Difficult to say. We have many "No symbol table info available." which means we
don't see the actual code line. What we see is it is dispatching the Wayland
server event loop.

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[kwin] [Bug 375971] kwin_wayland take 100% CPU

[Mustafa Muhammad]

https://bugs.kde.org/show_bug.cgi?id=375971

--- Comment #5 from Mustafa Muhammad  ---
Created attachment 103904
  --> https://bugs.kde.org/attachment.cgi?id=103904=edit
kwin_wayland trace

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[kwin] [Bug 375971] kwin_wayland take 100% CPU

[Mustafa Muhammad]

https://bugs.kde.org/show_bug.cgi?id=375971

--- Comment #4 from Mustafa Muhammad  ---
It happens sometimes, I didn't use gdb before, I used:
gdb -p `pidof kwin_wayland` -ex bt -ex 'thread apply all bt full' -ex detach
-ex quit &> kwin_wayland_trace

to create the attached file, hope it helps, please let me know if there is
anything else I can provide

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[kwin] [Bug 375971] kwin_wayland take 100% CPU

[Martin Gräßlin]

https://bugs.kde.org/show_bug.cgi?id=375971

--- Comment #3 from Martin Gräßlin  ---
What might be better is a gdb backtrace of the stuck process.

In general it works in neon wayland dev unstable, I'm just writing in such a
session.

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[kwin] [Bug 375971] kwin_wayland take 100% CPU

[Mustafa Muhammad]

https://bugs.kde.org/show_bug.cgi?id=375971

--- Comment #2 from Mustafa Muhammad  ---
Created attachment 103806
  --> https://bugs.kde.org/attachment.cgi?id=103806=edit
strace -c

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[kwin] [Bug 375971] kwin_wayland take 100% CPU

[Mustafa Muhammad]

https://bugs.kde.org/show_bug.cgi?id=375971

--- Comment #1 from Mustafa Muhammad  ---
Created attachment 103805
  --> https://bugs.kde.org/attachment.cgi?id=103805=edit
strace

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