https://bugs.kde.org/show_bug.cgi?id=413231
Bug ID: 413231
Summary: Kscreenlocker random crash after inotify_add failure
Product: kscreenlocker
Version: unspecified
Platform: Other
OS: Linux
Status: REPORTED
Severity: normal
Priority: NOR
Component: greeter
Assignee: plasma-b...@kde.org
Reporter: quwenruo.bt...@gmx.com
CC: bhus...@gmail.com
Target Milestone: ---
SUMMARY
First thing first, I don't understand why kscreenlocker is calling
inotify_add(), especially calling inotify_add() can fail due to limit. And I
don't believe it's OK to make kscreenlocker to read things in one's home
directory.
Secondly, kscreenlocker_greeter crash would easily make user experience crappy.
User needs to unlock the session manually using loginctl.
The crash happens with the following info in journal:
17:07:37 adam-pc kscreenlocker_greet[12230]:
inotify_add_watch(/home/adam/.config/plasmarc) failed: (No space left on
device)
17:07:37 adam-pc kscreenlocker_greet[12230]:
inotify_add_watch(/usr/share/plasma/desktoptheme/Arc-Dark/metadata.desktop)
failed: (No space left on device)
17:07:37 adam-pc kscreenlocker_greet[12230]:
inotify_add_watch(/usr/share/icons/Papirus-Dark/index.theme) failed: (No space
left on device)
17:07:37 adam-pc kscreenlocker_greet[12230]: inotify_add_watch(/etc/fstab)
failed: (No space left on device)
17:07:39 adam-pc kernel: kscreenlocker_g[12230]: segfault at 7ffbff7fdfe0 ip
00007efbfe417558 sp 00007ffbff7fdfb0 error 6 in
libQt5Gui.so.5.13.1[7efbfe0a6000+414000]
17:07:39 adam-pc kernel: Code: e5 40 e9 6b ff ff ff 90 66 2e 0f 1f 84 00 00 00
00 00 41 57 41 56 41 55 41 54 55 53 48 89 fb 48 81 ec c8 38 00 00 48 8b 6f 10
<48> 89 74 24 30 64 48 8b 04 25 28 00 00 00 48 >gg
STEPS TO REPRODUCE
1. Use fs.inotify.max_user_watches to a low value (in my case, it's 2048)
2. Lock the session manually or wait for screensaver to kick in
OBSERVED RESULT
Kscreenlocker crashes and have to use loginctl to unlock session
EXPECTED RESULT
Kscreenlocker kicks in and shows the regular greeter
SOFTWARE/OS VERSIONS
Linux/KDE Plasma:
KDE Plasma Version: 5.17.0
KDE Frameworks Version: 5.63.0
Qt Version: 5.13.1
ADDITIONAL INFORMATION
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