Bug 25670

Created attachment 11344 [details]
Strace of Okular trying to open a document (end)

Created attachment 11345 [details]
Strace of Dolphin when launching

Dolphin's window didn't appear.

Kwrite has the same behaviour

The applications are fine after a reboot.
Some days ago, I switched from Plasma to LXQt, because of the same behaviour seemed to affect plasmashell and the session was becoming unusable.
Now, at least the desktop survives to such problems.

(In reply to papoteur from comment #4)
> The applications are fine after a reboot.
If they remain OK, can you please close this bug - perhaps 'worksforme'.

CC: (none) => lewyssmith

Hi Lewis,
No, I don't to close it for the moment, because I suspect that this bad behaviour will come back later.
Rebooting a few times each day is not a good situation.

(In reply to papoteur from comment #6)
> Rebooting a few times each day is not a good situation.
This would of course be unacceptable.

> No, I don't to close it for the moment, because I suspect that this bad
> behaviour will come back later.
If the problem recurs, then we can assign the bug.
If it does not recur in the short term, please do close the bug; it can always be re-opened subsequently.

Hello,
Today, I got a hang of kwrite. I could kill it.
I relaunched it from console with strace.
After a moment without activity, I see that the console went with same kind of log, when the application was unresponsive, even from the closing cross.
here is a part of logs which are repeated without end:

...
nanosleep({tv_sec=0, tv_nsec=50000000}, 0x7ffd8ef0f950) = 0
select(19, [18], NULL, NULL, {tv_sec=0, tv_usec=0}) = 0 (Timeout)
write(5, "\1\0\0\0\0\0\0\0", 8)         = 8
nanosleep({tv_sec=0, tv_nsec=50000000}, 0x7ffd8ef0f950) = 0
select(19, [18], NULL, NULL, {tv_sec=0, tv_usec=0}) = 0 (Timeout)
write(5, "\1\0\0\0\0\0\0\0", 8)         = 8
nanosleep({tv_sec=0, tv_nsec=50000000}, 0x7ffd8ef0f950) = 0
select(19, [18], NULL, NULL, {tv_sec=0, tv_usec=0}) = 0 (Timeout)
write(5, "\1\0\0\0\0\0\0\0", 8)         = 8
nanosleep({tv_sec=0, tv_nsec=50000000}, 0x7ffd8ef0f950) = 0
select(19, [18], NULL, NULL, {tv_sec=0, tv_usec=0}) = 0 (Timeout)
write(5, "\1\0\0\0\0\0\0\0", 8)         = 8
nanosleep({tv_sec=0, tv_nsec=50000000}, 0x7ffd8ef0f950) = 0
select(19, [18], NULL, NULL, {tv_sec=0, tv_usec=0}) = 0 (Timeout)
write(5, "\1\0\0\0\0\0\0\0", 8)         = 8
nanosleep({tv_sec=0, tv_nsec=50000000}, 0x7ffd8ef0f950) = 0
select(19, [18], NULL, NULL, {tv_sec=0, tv_usec=0}) = 0 (Timeout)
write(5, "\1\0\0\0\0\0\0\0", 8)         = 8
nanosleep({tv_sec=0, tv_nsec=50000000}, 0x7ffd8ef0f950) = 0
select(19, [18], NULL, NULL, {tv_sec=0, tv_usec=0}) = 0 (Timeout)
write(5, "\1\0\0\0\0\0\0\0", 8)         = 8
nanosleep({tv_sec=0, tv_nsec=50000000}, 0x7ffd8ef0f950) = 0
select(19, [18], NULL, NULL, {tv_sec=0, tv_usec=0}) = 0 (Timeout)
write(5, "\1\0\0\0\0\0\0\0", 8)         = 8
nanosleep({tv_sec=0, tv_nsec=50000000}, 0x7ffd8ef0f950) = 0
select(19, [18], NULL, NULL, {tv_sec=0, tv_usec=0}) = 0 (Timeout)
write(5, "\1\0\0\0\0\0\0\0", 8)         = 8
nanosleep({tv_sec=0, tv_nsec=50000000}, 0x7ffd8ef0f950) = 0
select(19, [18], NULL, NULL, {tv_sec=0, tv_usec=0}) = 0 (Timeout)
write(5, "\1\0\0\0\0\0\0\0", 8)         = 8
nanosleep({tv_sec=0, tv_nsec=50000000}, 0x7ffd8ef0f950) = 0
select(19, [18], NULL, NULL, {tv_sec=0, tv_usec=0}) = 0 (Timeout)
write(5, "\1\0\0\0\0\0\0\0", 8)         = 8
nanosleep({tv_sec=0, tv_nsec=50000000}, 0x7ffd8ef0f950) = 0
select(19, [18], NULL, NULL, {tv_sec=0, tv_usec=0}) = 0 (Timeout)
write(5, "\1\0\0\0\0\0\0\0", 8)         = 8
nanosleep({tv_sec=0, tv_nsec=50000000}, 0x7ffd8ef0f950) = 0
select(19, [18], NULL, NULL, {tv_sec=0, tv_usec=0}) = 0 (Timeout)
...

At this time, okular and dolphin are working fine.

So the fault is arbitrary, but Plasma related. Thank you for the log information.
Assigning to the Plasma team.

Assignee: bugsquad => kde
CC: lewyssmith => (none)

Note that some time, when killing the unresponsive application, the whole desktop freezes.
This occurs each day.

Severity: normal => major

Konversation is affected too.

Created attachment 11396 [details]
freezes with simple search in kwrite

It is almost certain that the problem  is with the  version of plasma in MAGEIA 7. I am attaching a few screen shots, but I have many more.  At first I thought it was the chipset so I had that replaced, but the phenomena persisted.

I reinstalled MAGEIA 6.1 (which I assume has an older version of plasma) and I have not had any problems. I looked on the KDE bugzilla page and saw that similar problems were reported there. I posted a comment similar to this one there

Created attachment 11397 [details]
just switching desktops

note how the individual cpu usages are very small, but the total is 100%

Created attachment 11398 [details]
just pluggin in a USB stick

CC: (none) => roger

Hi Roger,
For what I see, the system comes back to a normal state after a while.
This is not the behaviour I reported. In my case, the application which freezes doesn't come back to a normal state, and when I kill it, most of the case it will kill also the desktop.

Hi,
I disabled seafile and the problem never occured since.
Thus I suspect it was the culprit.
Closing now.

Resolution: (none) => FIXED
Status: NEW => RESOLVED

Created attachment 11444 [details]
seafile_01.png

Created attachment 11445 [details]
seafile02