https://bugs.kde.org/show_bug.cgi?id=437520
Bug ID: 437520
Summary: Intermittent lock screen hang after wake from sleep
Product: kscreenlocker
Version: unspecified
Platform: Fedora RPMs
OS: Linux
Status: REPORTED
Severity: major
Priority: NOR
Component: general
Assignee: plasma-b...@kde.org
Reporter: ke...@myplaceonline.com
CC: bhus...@gmail.com
Target Milestone: ---
Created attachment 138692
--> https://bugs.kde.org/attachment.cgi?id=138692&action=edit
pstree
SUMMARY
After upgrading to Fedora 34, I'm experiencing intermittent lock screen hangs
after waking from sleep (probably 1 out of 10 times). The lock screen
background shows up, and the mouse can move, but nothing else shows up. I can
Ctrl+Clt+F3 to start a new command line session with root, but I usually then
just reboot and thus lose all my work so this is a significant issue. This has
happened multiple times.
STEPS TO REPRODUCE
1. Sleep computer
2. Wake computer
3. Intermittently, background and mouse show but nothing else, and I cannot
login
SOFTWARE/OS VERSIONS
Operating System: Fedora 34
KDE Frameworks Version: 5.81.0
Qt Version: 5.15.2
Kernel Version: 5.12.1-198.vanilla.1.fc34.x86_64
OS Type: 64-bit
Graphics Platform: X11
Processors: 4 × Intel® Core™ i5-7300U CPU @ 2.60GHz
Memory: 15.5 GiB of RAM
Graphics Processor: Mesa Intel® HD Graphics 620
ADDITIONAL INFORMATION
After switching to Ctrl+Alt+F3 and logging in as root, I ran pstree which I
will attach. Then I ran the following to get pstacks of all processes.
for pid in $(ls /proc/ | awk '/^[0-9]/'); do pstack $pid &> pstack_${pid}.txt;
done
Guessing which processes might be lock screen related, I took 6 core dumps with
gcore. Let me know if you want me to upload any of them or run things like
`thread apply all bt` in gdb on them.
Also attaching the journalctl since boot. The problematic wakeup starts at
around 2021-05-19 14:05. No obvious warnings or errors on or after that time in
the boot log.
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