[kwin] [Bug 353428] KWin freezes until drkonqi is closed from a terminal

[Vincenzo Di Massa via KDE Bugzilla]

https://bugs.kde.org/show_bug.cgi?id=353428

--- Comment #44 from Vincenzo Di Massa  ---
Comment on attachment 98434
  --> https://bugs.kde.org/attachment.cgi?id=98434
Trace of the locked kwin

Sorry I posted it on the wrong bug report.

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[kwin] [Bug 353428] KWin freezes until drkonqi is closed from a terminal

[Thomas Lübking via KDE Bugzilla]

https://bugs.kde.org/show_bug.cgi?id=353428

--- Comment #43 from Thomas Lübking  ---
The backtrace doesn't look like the kwin process had segfaulted at all - sure
this is the SIGSTOP'd kwin process?

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[kwin] [Bug 353428] KWin freezes until drkonqi is closed from a terminal

[Vincenzo Di Massa via KDE Bugzilla]

https://bugs.kde.org/show_bug.cgi?id=353428

Vincenzo Di Massa  changed:

   What|Removed |Added

 CC||hawk...@tiscali.it

--- Comment #42 from Vincenzo Di Massa  ---
Created attachment 98434
  --> https://bugs.kde.org/attachment.cgi?id=98434=edit
Trace of the locked kwin

This trace is probably of little usefulness,  also because the lock happened
literally 500KM away from my external screen.

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[kwin] [Bug 353428] KWin freezes until drkonqi is closed from a terminal

[Thomas Lübking via KDE Bugzilla]

https://bugs.kde.org/show_bug.cgi?id=353428

Thomas Lübking  changed:

   What|Removed |Added

 CC||hun...@gmail.com

--- Comment #41 from Thomas Lübking  ---
*** Bug 359473 has been marked as a duplicate of this bug. ***

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[kwin] [Bug 353428] KWin freezes until drkonqi is closed from a terminal

[Thomas Lübking via KDE Bugzilla]

https://bugs.kde.org/show_bug.cgi?id=353428

Thomas Lübking  changed:

   What|Removed |Added

 CC||tipos...@tiscali.it

--- Comment #40 from Thomas Lübking  ---
*** Bug 358891 has been marked as a duplicate of this bug. ***

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[kwin] [Bug 353428] KWin freezes until drkonqi is closed from a terminal

[Thomas Lübking via KDE Bugzilla]

https://bugs.kde.org/show_bug.cgi?id=353428

Thomas Lübking  changed:

   What|Removed |Added

 CC||michaelkutsch...@web.de

--- Comment #39 from Thomas Lübking  ---
*** Bug 358416 has been marked as a duplicate of this bug. ***

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[kwin] [Bug 353428] KWin freezes until drkonqi is closed from a terminal

[Thomas Lübking via KDE Bugzilla]

https://bugs.kde.org/show_bug.cgi?id=353428

Thomas Lübking  changed:

   What|Removed |Added

 CC||cameron...@poczta.fm

--- Comment #37 from Thomas Lübking  ---
*** Bug 357536 has been marked as a duplicate of this bug. ***

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[kwin] [Bug 353428] KWin freezes until drkonqi is closed from a terminal

[Thomas Lübking via KDE Bugzilla]

https://bugs.kde.org/show_bug.cgi?id=353428

Thomas Lübking  changed:

   What|Removed |Added

URL||https://git.reviewboard.kde
   ||.org/r/126741/
  Flags||ReviewRequest+

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[kwin] [Bug 353428] KWin freezes until drkonqi is closed from a terminal

[Thomas Lübking via KDE Bugzilla]

https://bugs.kde.org/show_bug.cgi?id=353428

Thomas Lübking  changed:

   What|Removed |Added

 Resolution|--- |FIXED
  Latest Commit||http://commits.kde.org/kwin
   ||/69aa80750f8d61a5db6311c337
   ||51461041a260d5
   Version Fixed In||5.6
 Status|UNCONFIRMED |RESOLVED

--- Comment #38 from Thomas Lübking  ---
Git commit 69aa80750f8d61a5db6311c33751461041a260d5 by Thomas Lübking.
Committed on 14/01/2016 at 22:40.
Pushed by luebking into branch 'master'.

force restart on crash

We don't want to actively release claims on segfaults, but then
drkonqi can stop us while we're still holding the WM privs.

=> If KWin performs a crash-restart, it forcefully takes WM privs
(since the old instance shall be replaced for quite sure)
Related: bug 348834, bug 353030

REVIEW: 126741
FIXED-IN: 5.6

M  +3-2main_x11.cpp

http://commits.kde.org/kwin/69aa80750f8d61a5db6311c33751461041a260d5

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[kwin] [Bug 353428] KWin freezes until drkonqi is closed from a terminal

[Robin Laing via KDE Bugzilla]

https://bugs.kde.org/show_bug.cgi?id=353428

--- Comment #36 from Robin Laing  ---
Just an update.

After major problems with KDE after the latest KDE updates, I decided to wipe
out all my old configuration files and start my account from scratch.  Since
doing this, I have not had a single crash.

When time permits, I will play and see if I can narrow the cause down to a
single file as I didn't delete all the files.

Hope to move to Fedora 23 tomorrow and hope everything is still working.

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[kwin] [Bug 353428] KWin freezes until drkonqi is closed from a terminal

[Robin Laing via KDE Bugzilla]

https://bugs.kde.org/show_bug.cgi?id=353428

--- Comment #34 from Robin Laing  ---
No, it was the "Strg-Alt-Fx" you wrote that I hope was a typo.  

Your freezing is similar to a situation that I run into every once in a while
that is different.  My desktop will totally freeze but it is not related to
this bug.

I have ssh'd into the machine but the X server won't refresh the screen.  I
think it is related to the motherboard having integrated graphics.  Hasn't
happened lately but I have had situations where the system seemed to move to a
crawl.

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[kwin] [Bug 353428] KWin freezes until drkonqi is closed from a terminal

[Thomas Lübking via KDE Bugzilla]

https://bugs.kde.org/show_bug.cgi?id=353428

--- Comment #32 from Thomas Lübking  ---
PS, dev note: we could investigate in "stealing" the WM selection from the
restarted instance if there's a crashcounter flag in the args.

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[kwin] [Bug 353428] KWin freezes until drkonqi is closed from a terminal

[Thomas Lübking via KDE Bugzilla]

https://bugs.kde.org/show_bug.cgi?id=353428

--- Comment #31 from Thomas Lübking  ---
I do not question that the KWin GL context "somehow™" triggers this condition -
but it really sounds like a kernel bug (and is hard to debug for this)
You could simply avoid the ugly conditions by eg. switching to the XRender
compositing backend (afair, xfce uses xrender exclusively for compositing)

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[kwin] [Bug 353428] KWin freezes until drkonqi is closed from a terminal

[Thomas Lübking via KDE Bugzilla]

https://bugs.kde.org/show_bug.cgi?id=353428

--- Comment #33 from Thomas Lübking  ---
In theory™, this should do:

diff --git a/main_x11.cpp b/main_x11.cpp
index 2c13743..1736f0d 100644
--- a/main_x11.cpp
+++ b/main_x11.cpp
@@ -173,7 +173,8 @@ void ApplicationX11::performStartup()
   
  maskValues)));
 if (!redirectCheck.isNull()) {
 fputs(i18n("kwin: another window manager is running (try using
--replace)\n").toLocal8Bit().constData(), stderr);
-::exit(1);
+if (!wasCrash()) // if this is a crash-restart, DrKonqi may have
stopped the process w/o killing the connection
+::exit(1);
 }

 createInput();
@@ -185,7 +186,7 @@ void ApplicationX11::performStartup()
 });
 // we need to do an XSync here, otherwise the QPA might crash us later on
 Xcb::sync();
-owner->claim(m_replace, true);
+owner->claim(m_replace || wasCrash(), true);

 createAtoms();
 }



But actually just stopping kwin ain't enough - and the behavior is still not
deterministic.
So let's wait whether I somewhen get a stopped kwin + no resolution

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[kwin] [Bug 353428] KWin freezes until drkonqi is closed from a terminal

[Bert Zimpel via KDE Bugzilla]

https://bugs.kde.org/show_bug.cgi?id=353428

--- Comment #30 from Bert Zimpel  ---
(In reply to Thomas Lübking from comment #28)
> The inability to switch to another VT means a problem in the kernel (at
> least framebuffer control)

Hallo Thjomas, 

partially right, however the freeze and subsequently the inability to change to
a terminal window does +not+ occur in Xfce (alternative Windows Manager). I had
to change to Xfce as the KDE system tends to freeze always at the worst point
(when files are "open") in a productive process.

Bert

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[kwin] [Bug 353428] KWin freezes until drkonqi is closed from a terminal

[Bert Zimpel via KDE Bugzilla]

https://bugs.kde.org/show_bug.cgi?id=353428

Bert Zimpel  changed:

   What|Removed |Added

 CC||b...@grupo-samadhi.net

--- Comment #29 from Bert Zimpel  ---
Hallo Robin,

thank you for your comment! 
>  I usually use F5 out of years of habit. I hope your comment is a typo. (In 
> reply to Robin Laing from comment #27)
Fx represents F1 to F6, the available terminal screens at my system. Hopes that
 helps to clarify the "typo".

Bert

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[kwin] [Bug 353428] KWin freezes until drkonqi is closed from a terminal

[Thomas Lübking via KDE Bugzilla]

https://bugs.kde.org/show_bug.cgi?id=353428

--- Comment #28 from Thomas Lübking  ---
The inability to switch to another VT means a problem in the kernel (at least
framebuffer control)
Nobody said this is fixed and I assume you hit this on "your" account because
of some config there crashes kwin itfp (auorae decoration?, there're plenty of
bug reports on the QML V4 engine)

See comment #14 - unfortunately releasing the WM selection w/o calling into the
xcb connection is a bit "tricky" ;-) (comment #15)

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[kwin] [Bug 353428] KWin freezes until drkonqi is closed from a terminal

[Robin Laing via KDE Bugzilla]

https://bugs.kde.org/show_bug.cgi?id=353428

--- Comment #26 from Robin Laing  ---
For part of the discussion.

I wonder if others that are having this issue have upgraded and those that
don't have a problem are using a clean install.

I have a couple of test accounts on the same machine but never seem to have the
issue on those test accounts.  Only on my personal account.

I have tried to clean up the configuration files but with things moving, I have
not found everything.  I am loath to setup up a fully clean personal account
since the settings are not fully back to where they were.

FWIW, it happened to me last night so I this issue is not FIXED.

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[kwin] [Bug 353428] KWin freezes until drkonqi is closed from a terminal

[Robin Laing via KDE Bugzilla]

https://bugs.kde.org/show_bug.cgi?id=353428

--- Comment #27 from Robin Laing  ---
Bzi, comment 25

I use a USB keyboard and can Ctrl+Alt+Fx to the terminal.  I usually use F5 out
of years of habit.  I hope your comment is a typo.  Try to Ctrl+Alt+Fx before
the lockup and see if that works.

I have had some strange system pauses with media files from time to time and
have no clue what is causing it.  In some cases it seems that the machine has
died when it hasn't.

Do you have another computer to ssh into the "frozen" machine?  I have used
this to troubleshoot issues and to get out of complicated issues.

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[kwin] [Bug 353428] KWin freezes until drkonqi is closed from a terminal

[bzi]

https://bugs.kde.org/show_bug.cgi?id=353428

b...@samadhi-institute.org  changed:

   What|Removed |Added

 CC||samadhi.0...@gmail.com

--- Comment #25 from b...@samadhi-institute.org  ---
I experience absolute similar behavior, display freezes only mouse to move,
however I am not able to  Strg-Alt-Fx (USB Keyboard) to a terminal window. So
the only way to recover is a reset.

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[kwin] [Bug 353428] KWin freezes until drkonqi is closed from a terminal

[Thomas Lübking via KDE Bugzilla]

https://bugs.kde.org/show_bug.cgi?id=353428

--- Comment #24 from Thomas Lübking  ---
No, but this is no deterministic error (depends on when the crash occurs and
when the next xcb flush takes place) - I personally saw it once or twice only.
Also kwin should not crash itfp. and maybe your distro has simply backported
the patch that prevents 0x0 QScreen deref segfault ... (less crashes, less
problems with crash handling ;-)

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[kwin] [Bug 353428] KWin freezes until drkonqi is closed from a terminal

[Villu Ruusmann via KDE Bugzilla]

https://bugs.kde.org/show_bug.cgi?id=353428

--- Comment #23 from Villu Ruusmann  ---
Has any work been done on this? I've been applying all Fedora 23 updates, and I
just realized that my issue has probably gone away - there has been no need to
kill drkonqi during last sessions.

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