https://bugs.kde.org/show_bug.cgi?id=475506
Bug ID: 475506
Summary: Screen locking failed because of too many open files,
but rest of system works fine
Classification: Plasma
Product: kscreenlocker
Version: 5.27.4
Platform: openSUSE
OS: Linux
Status: REPORTED
Severity: normal
Priority: NOR
Component: general
Assignee: [email protected]
Reporter: [email protected]
Target Milestone: ---
SUMMARY
***
Due to a problem with an unrelated software component (KMozillaHelper, see
https://www.opensuse-forum.de/thread/66654-maximum-number-of-clients-reached-kmozillahelper/
(German, unfortunately)) I recently had many processes running and files open
even right after booting my system. This did not cause any noticeable problems.
I could start my IDE for software development, browse the web, etc. As far as I
can tell the only issue I had is that I could not lock my screen, either via
keyboard shortcut or by clicking the lock icon in the task bar. The error
message in the logs was this:
2023-10-09T13:14:55.692681+02:00 laptop ksmserver[4361]:
QProcessPrivate::createPipe: Cannot create pipe 0x7fbf90004b78 (Too many open
files)
2023-10-09T13:14:55.699846+02:00 laptop ksmserver[4361]: kscreenlocker: Greeter
Process not available
Obviously this issue can be fixed by killing spurious kmozillahelper processes,
but I do wonder why starting any other programm/process worked fine, and only
the screen locker (a vital component!) could not be started. So please give
this issue a thought before telling me to clean up my system ;-).
PS executing /usr/lib/kscreenlocker_greet manually did work as expected!
***
STEPS TO REPRODUCE
1. Open sufficiently many instances of KMozillaHelper
2. Try to lock the screen
OBSERVED RESULT
Screen did not lock
EXPECTED RESULT
Should have been locked
SOFTWARE/OS VERSIONS
KDE Plasma Version: 5.27.4
KDE Frameworks Version: 5.103.0
Qt Version: 5.15.8
ADDITIONAL INFORMATION
My "ulimit" settings:
$ ulimit -a
core file size (blocks, -c) unlimited
data seg size (kbytes, -d) unlimited
scheduling priority (-e) 0
file size (blocks, -f) unlimited
pending signals (-i) 127197
max locked memory (kbytes, -l) 64
max memory size (kbytes, -m) unlimited
open files (-n) 1024
pipe size (512 bytes, -p) 8
POSIX message queues (bytes, -q) 819200
real-time priority (-r) 0
stack size (kbytes, -s) 8192
cpu time (seconds, -t) unlimited
max user processes (-u) 127197
virtual memory (kbytes, -v) unlimited
file locks (-x) unlimited
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