[kwin] [Bug 399836] kwin crash on changing virtual desktop

[Bug Janitor Service]

https://bugs.kde.org/show_bug.cgi?id=399836

Bug Janitor Service  changed:

   What|Removed |Added

 Resolution|BACKTRACE   |WORKSFORME
 Status|NEEDSINFO   |RESOLVED

--- Comment #16 from Bug Janitor Service  ---
This bug has been in NEEDSINFO status with no change for at least
30 days. The bug is now closed as RESOLVED > WORKSFORME
due to lack of needed information.

For more information about our bug triaging procedures please read the
wiki located here:
https://community.kde.org/Guidelines_and_HOWTOs/Bug_triaging

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[kwin] [Bug 399836] kwin crash on changing virtual desktop

[Bug Janitor Service]

https://bugs.kde.org/show_bug.cgi?id=399836

--- Comment #15 from Bug Janitor Service  ---
Dear Bug Submitter,

This bug has been in NEEDSINFO status with no change for at least
15 days. Please provide the requested information as soon as
possible and set the bug status as REPORTED. Due to regular bug
tracker maintenance, if the bug is still in NEEDSINFO status with
no change in 30 days the bug will be closed as RESOLVED > WORKSFORME
due to lack of needed information.

For more information about our bug triaging procedures please read the
wiki located here:
https://community.kde.org/Guidelines_and_HOWTOs/Bug_triaging

If you have already provided the requested information, please
mark the bug as REPORTED so that the KDE team knows that the bug is
ready to be confirmed.

Thank you for helping us make KDE software even better for everyone!

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[kwin] [Bug 399836] kwin crash on changing virtual desktop

[Vlad Zagorodniy]

https://bugs.kde.org/show_bug.cgi?id=399836

--- Comment #14 from Vlad Zagorodniy  ---
(In reply to Stamatis Kavvadias from comment #13)
> Instead, my current kwin version just exits normally when the bug happens.

If the bug is still present, KWin *should* crash. If KWin doesn't crash, then
there is no bug (or it was fixed).

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[kwin] [Bug 399836] kwin crash on changing virtual desktop

[Stamatis Kavvadias]

https://bugs.kde.org/show_bug.cgi?id=399836

--- Comment #13 from Stamatis Kavvadias  ---
Listen, I am sorry if I was not clear enough (but you also did not check my
previous efforts to provide a backtrace). The case is that, since I provided
the initial backtrace (w/o debug symbols), I have accepted an update which
changed the situation: I no longer have a version of kwin (or kwin_x11) that
crashes from the bug. Instead, my current kwin version just exits normally when
the bug happens.

This update happened exactly before I tried to attach gdb to kwin, so when I
did the result was that gdb *could not* provide a backtrace. I have provided
the output of gdb in this case, which explains clearly why. So, tell me
something new to do or just delete this bug report, if it cannot be handled,
under the circumstances. Thank you for your efforts, anyway.

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[kwin] [Bug 399836] kwin crash on changing virtual desktop

[Vlad Zagorodniy]

https://bugs.kde.org/show_bug.cgi?id=399836

--- Comment #12 from Vlad Zagorodniy  ---
(In reply to Stamatis Kavvadias from comment #11)
> The crash does not trigger the KDE Crash Dialog to appear
You don't have to use that to get a backtrace.

> Unless you can guide me on how
I already told you how to get a backtrace, you attach to kwin_x11, make kwin
crash, and then run `(gdb) backtrace`.

> How can this bug ever be reported and corrected now, if you require a
> backtrace?
This is a standard requirement for crash bug reports. For us, it can be hard to
reproduce bugs, backtraces help a lot to understand what went wrong.

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[kwin] [Bug 399836] kwin crash on changing virtual desktop

[Stamatis Kavvadias]

https://bugs.kde.org/show_bug.cgi?id=399836

--- Comment #11 from Stamatis Kavvadias  ---
Please read the whole (short) history of these comments. I cannot do what you
ask any more. The crash does not trigger the KDE Crash Dialog to appear, after
there has been an update of kwin and plasma packages. The crash still persists
but, according to my efforts to provide a gdb backtrace, kwin exits normally
and there can be no backtrace! Unless you can guide me on how to monitor with
gdb any signals kwin may be receiving before it exits, I cannot provide the
backtrace asked.

In my opinion, you should try to debug this differently, as the last update has
hidden a bug that once led to a crash, so that it now exits normally. How can
this bug ever be reported and corrected now, if you require a backtrace?

Nevertheless, if you cannot reproduce the bug, I understand you do not have a
place to start. But, this would leave me no option, but to go back to Kubuntu
16.04, which did not have this problem.

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[kwin] [Bug 399836] kwin crash on changing virtual desktop

[Vlad Zagorodniy]

https://bugs.kde.org/show_bug.cgi?id=399836

Vlad Zagorodniy  changed:

   What|Removed |Added

 Resolution|--- |BACKTRACE
 Status|REPORTED|NEEDSINFO

--- Comment #10 from Vlad Zagorodniy  ---
After you installed kwin debug packages, attach to kwin_x11 and try to
reproduce the crash (by switching between virtual desktops). When kwin has
crashed, run `(gdb) backtrace` and post the backtrace here.

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[kwin] [Bug 399836] kwin crash on changing virtual desktop

[Stamatis Kavvadias]

https://bugs.kde.org/show_bug.cgi?id=399836

Stamatis Kavvadias  changed:

   What|Removed |Added

 CC||stamatis.kavvad...@gmail.co
   ||m

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[kwin] [Bug 399836] kwin crash on changing virtual desktop

[Stamatis Kavvadias]

https://bugs.kde.org/show_bug.cgi?id=399836

Stamatis Kavvadias  changed:

   What|Removed |Added

 Status|RESOLVED|REPORTED
 Resolution|WORKSFORME  |---

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[kwin] [Bug 399836] kwin crash on changing virtual desktop

[Bug Janitor Service]

https://bugs.kde.org/show_bug.cgi?id=399836

Bug Janitor Service  changed:

   What|Removed |Added

 Status|NEEDSINFO   |RESOLVED
 Resolution|WAITINGFORINFO  |WORKSFORME

--- Comment #9 from Bug Janitor Service  ---
This bug has been in NEEDSINFO status with no change for at least
30 days. The bug is now closed as RESOLVED > WORKSFORME
due to lack of needed information.

For more information about our bug triaging procedures please read the
wiki located here:
https://community.kde.org/Guidelines_and_HOWTOs/Bug_triaging

Thank you for helping us make KDE software even better for everyone!

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[kwin] [Bug 399836] kwin crash on changing virtual desktop

[Bug Janitor Service]

https://bugs.kde.org/show_bug.cgi?id=399836

--- Comment #8 from Bug Janitor Service  ---
Dear Bug Submitter,

This bug has been in NEEDSINFO status with no change for at least
15 days. Please provide the requested information as soon as
possible and set the bug status as REPORTED. Due to regular bug
tracker maintenance, if the bug is still in NEEDSINFO status with
no change in 30 days the bug will be closed as RESOLVED > WORKSFORME
due to lack of needed information.

For more information about our bug triaging procedures please read the
wiki located here:
https://community.kde.org/Guidelines_and_HOWTOs/Bug_triaging

If you have already provided the requested information, please
mark the bug as REPORTED so that the KDE team knows that the bug is
ready to be confirmed.

Thank you for helping us make KDE software even better for everyone!

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[kwin] [Bug 399836] kwin crash on changing virtual desktop

[Stamatis Kavvadias]

https://bugs.kde.org/show_bug.cgi?id=399836

--- Comment #7 from Stamatis Kavvadias  ---
Just to make it clear, kwin_x11 exits without a logout and windows are still
visible, but non-responsive. This seems wrong to me, or kwin_x11 process
received a signal, which I cannot monitor, unless you guide me on how to
instruct gdb to catch such an event...

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[kwin] [Bug 399836] kwin crash on changing virtual desktop

[Stamatis Kavvadias]

https://bugs.kde.org/show_bug.cgi?id=399836

--- Comment #6 from Stamatis Kavvadias  ---
I found that kwin_x11 symbols are included in the kwin package.

I followed the instructions in the page you mention, using gdb from a remote
ssh terminal (from my laptop  to the desktop). I tried twice to get the
backtrace via gdb. The first time there was a kwin process running and no
kwin_x11 and the next time the other way round. There has been an update of
kwin and plasma packages in-between, but both times gdb cannot provide a
backtrace. The first time I was not sure what happened; I provide the output of
the second try, bellow.

As you will see, it appears kwin_x11 exits normally(!!!) and I cannot get a
backtrace. Here is the output of the command used, i.e.

gdb --pid `pidof kwin_x11` 2>&1 | tee kwin_x11.gdb

---

GNU gdb (Ubuntu 8.1-0ubuntu3) 8.1.0.20180409-git
Copyright (C) 2018 Free Software Foundation, Inc.
License GPLv3+: GNU GPL version 3 or later 
This is free software: you are free to change and redistribute it.
There is NO WARRANTY, to the extent permitted by law.  Type "show copying"
and "show warranty" for details.
This GDB was configured as "x86_64-linux-gnu".
Type "show configuration" for configuration details.
For bug reporting instructions, please see:
.
Find the GDB manual and other documentation resources online at:
.
For help, type "help".
Type "apropos word" to search for commands related to "word".
Attaching to process 2460
[New LWP 2462]
[New LWP 2480]
[New LWP 2542]
[New LWP 2637]
[New LWP 2652]
[Thread debugging using libthread_db enabled]
Using host libthread_db library "/lib/x86_64-linux-gnu/libthread_db.so.1".
0x7f13b1348cf6 in __GI_ppoll (fds=0x5574122160c8, nfds=5,
timeout=, 
sigmask=0x0) at ../sysdeps/unix/sysv/linux/ppoll.c:39
39  ../sysdeps/unix/sysv/linux/ppoll.c: No such file or directory.
(gdb) c
Continuing.
[New Thread 0x7f1379ff7700 (LWP 4603)]
[Thread 0x7f1379185700 (LWP 2637) exited]
[Thread 0x7f1395788700 (LWP 2480) exited]
[Thread 0x7f1379ff7700 (LWP 4603) exited]
[Thread 0x7f1370f69700 (LWP 2652) exited]
[Thread 0x7f138f5e0700 (LWP 2542) exited]
[Thread 0x7f13b19e9cc0 (LWP 2460) exited]
[Inferior 1 (process 2460) exited with code 01]
(gdb) bt
No stack.
(gdb) detach
The program is not being run.
(gdb) run
Starting program: /usr/bin/kwin_x11 
[Thread debugging using libthread_db enabled]
Using host libthread_db library "/lib/x86_64-linux-gnu/libthread_db.so.1".
/usr/bin/kwin_x11: FATAL ERROR while trying to open display 
[Inferior 1 (process 10196) exited with code 01]
(gdb) quit

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[kwin] [Bug 399836] kwin crash on changing virtual desktop

[Vlad Zagorodniy]

https://bugs.kde.org/show_bug.cgi?id=399836

--- Comment #5 from Vlad Zagorodniy  ---
According to https://launchpad.net/ubuntu/+source/kwin, you probably need to
install kwin-common-dbgsym (take my words with a grain of salt, I have no idea
how Ubuntu folks package things; I suggest to ask Ubuntu folks what debug
packages to install)

Regarding debugging, you would need to ssh from another machine, see
https://community.kde.org/KWin/Debugging

I hope it will help you. :-)

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[kwin] [Bug 399836] kwin crash on changing virtual desktop

[Stamatis Kavvadias]

https://bugs.kde.org/show_bug.cgi?id=399836

--- Comment #4 from Stamatis Kavvadias  ---
I cannot send an updated backtrace because KDE Crash Dialog does not appear
again.

Your link for howto get symbols for the backtrace is wrong. I had to read a
useless page (since I am not classifying this bug, just reporting it) to get to
https://community.kde.org/Guidelines_and_HOWTOs/Debugging/How_to_create_useful_crash_reports,
which instructs on how to get debug symbols.

I found out I need to install kdelibs5-dbg. I do not know if I need to install
symbols for kwin and which packages to install (kwin does not have any -dbg
package available).

Still I cannot produce and send a backtrace, if KDE Crash Dialog does not
appear . kwin still crashes, after a few desktop changes. It is likely that the
cube desktop switch effect and the multiple windows in multiple activities I
have running, do not interoperate correctly, but I cannot tell you anything
more.

What should I do with this bug? Going back to Kubuntu 16.04 is my best
alternative.

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[kwin] [Bug 399836] kwin crash on changing virtual desktop

[Bug Janitor Service]

https://bugs.kde.org/show_bug.cgi?id=399836

--- Comment #3 from Bug Janitor Service  ---
Dear Bug Submitter,

This bug has been in NEEDSINFO status with no change for at least
15 days. Please provide the requested information as soon as
possible and set the bug status as REPORTED. Due to regular bug
tracker maintenance, if the bug is still in NEEDSINFO status with
no change in 30 days the bug will be closed as RESOLVED > WORKSFORME
due to lack of needed information.

For more information about our bug triaging procedures please read the
wiki located here:
https://community.kde.org/Guidelines_and_HOWTOs/Bug_triaging

If you have already provided the requested information, please
mark the bug as REPORTED so that the KDE team knows that the bug is
ready to be confirmed.

Thank you for helping us make KDE software even better for everyone!

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[kwin] [Bug 399836] kwin crash on changing virtual desktop

[Vlad Zagorodniy]

https://bugs.kde.org/show_bug.cgi?id=399836

Vlad Zagorodniy  changed:

   What|Removed |Added

 Resolution|--- |WAITINGFORINFO
 Status|REPORTED|NEEDSINFO

--- Comment #2 from Vlad Zagorodniy  ---
Unfortunately the backtrace lacks debug symbols. Could you please install debug
packages and submit a new backtrace?

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[kwin] [Bug 399836] kwin crash on changing virtual desktop

[Stamatis Kavvadias]

https://bugs.kde.org/show_bug.cgi?id=399836

--- Comment #1 from Stamatis Kavvadias  ---
I had another crash, just hours after the original report. This time an
application (claws-mail) from another activity and a different virtual desktop
number, showed up in the task manager. When I clicked on it, kwin crashed.

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