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Hello-
A recent system update (pacman -Suy) hung on my system.
(1/1) Updating the desktop file MIME type cache...A look at top shows 100% cpu on a single process
12149 root 20 0 11.8m 2.4m 100.0 0.0 9:13.25 R update-desktop- 0.0mLooking at the full command of the process
[dylan@shoparch pkg]$ ps aux | grep 12149
root 12149 99.9 0.0 12132 2472 pts/1 R+ 19:14 10:49 /usr/bin/update-desktop-database --quiet
dylan 12159 0.0 0.0 10756 2160 pts/3 S+ 19:25 0:00 grep 12149
[dylan@shoparch pkg]$ It seems to be a hook
[dylan@shoparch pkg]$ grep update-desktop /var/log/pacman.log
[2016-05-16 07:06] [ALPM] running 'update-desktop-database.hook'...control + c during the update will stop the process:
(1/1) Updating the desktop file MIME type cache...
^C
Interrupt signal received
error: command terminated by signal 2: Interrupt
[dylan@shoparch pkg]$ Anyway, at least i know the command, and can run it manually
I can see in help that it has a '--verbose' option
-v, --verbose Display more information about processing and updating progressrun manually with a bunch of v's:
[dylan@shoparch pkg]$ sudo /usr/bin/update-desktop-database -vvvvv
Search path is now: [/usr/local/share/applications, /usr/share/applications]
Could not create cache file in "/usr/local/share/applications": Error opening directory '/usr/local/share/applications': No such file or directoryThe first path doesnt' exist, the second does exist, so the error I assume is expected:
[dylan@shoparch pkg]$ ls -ld /usr/local/share/applications /usr/share/applications/
ls: cannot access '/usr/local/share/applications': No such file or directory
drwxr-xr-x 2 root root 4096 Nov 29 19:14 /usr/share/applications/
[dylan@shoparch pkg]$ After reading the man page, its clear that update-desktop-database scans for files in those directories, with a suffix of .desktop.
There are a lot of files there that match that description:
[dylan@shoparch pkg]$ ls -l /usr/share/applications/*.desktop | wc -l
94Maybe one is corrupt (even though man page says it will skip corrupt), or it is getting stuck on one...
[dylan@shoparch pkg]$ sudo ls -l /proc/12273/fd
total 0
lrwx------ 1 root root 64 Nov 29 19:56 0 -> /dev/pts/3
lrwx------ 1 root root 64 Nov 29 19:56 1 -> /dev/pts/3
lrwx------ 1 root root 64 Nov 29 19:56 2 -> /dev/pts/3
lr-x------ 1 root root 64 Nov 29 19:56 3 -> /usr/share/applications
lr-x------ 1 root root 64 Nov 29 19:56 4 -> /usr/share/applications/gtk3-widget-factory.desktop
[dylan@shoparch pkg]$ It hangs there and never continues. If i remove that file, it hangs at the next file and never continues.
I moved the /usr/share/applications directory, and created a new on in it's place: then the command executes successfully and creates a file as expected
[dylan@shoparch pkg]$ sudo mv /usr/share/applications/ /home/dylan/
[dylan@shoparch pkg]$ sudo mkdir /usr/share/applications
[dylan@shoparch pkg]$ sudo /usr/bin/update-desktop-database -vvvvv
Search path is now: [/usr/local/share/applications, /usr/share/applications]
Could not create cache file in "/usr/local/share/applications": Error opening directory '/usr/local/share/applications': No such file or directory
[dylan@shoparch pkg]$ echo $?
0
[dylan@shoparch pkg]$ ls -al /usr/share/applications/
total 12
drwxr-xr-x 2 root root 4096 Nov 29 20:06 .
drwxr-xr-x 198 root root 4096 Nov 29 20:05 ..
-rw-r--r-- 1 root root 13 Nov 29 20:06 mimeinfo.cache
[dylan@shoparch pkg]$ The first file it hangs on is as follows, and how it looks
[dylan@shoparch pkg]$ ls -l /usr/share/applications/gtk3-widget-factory.desktop
-rw-r--r-- 1 root root 246 Nov 29 20:14 /usr/share/applications/gtk3-widget-factory.desktop
[dylan@shoparch pkg]$ cat /usr/share/applications/gtk3-widget-factory.desktop
[Desktop Entry]
Name=Widget Factory
Comment=A showcase for GTK+ widgets, designed for testing themes.
Exec=gtk3-widget-factory
Icon=gtk3-widget-factory
Terminal=false
Type=Application
StartupNotify=true
Categories=Development;GTK;
NoDisplay=true
[dylan@shoparch pkg]$ I've tried copying just a single .desktop file into /usr/share/applications, but it hangs on any single file i put in the directory
I've also tried reinstalling desktop-file-utils, including forcing a new download by removing the cached file in /var/cache/pacman/pkg/ and using pacman -Syy
I'm at a loss as to how to further troubleshoot.
Suggestions?
Last edited by thenextdon13 (2016-12-04 05:12:43)
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Help from the dev pinpointed that glib2 was causing the hang.
I reinstalled glib2 and all dependencies (there weren't any), and now update-destop-database -v has the same output as on other machines.
I think perhaps my glib2 install was corrupted, perhaps by a bad hard drive? while I was building glib and desktop-file-utils with debug options, I saw ata timeouts in my dmesg.
[454571.466004] ata7.00: failed command: WRITE FPDMA QUEUED
[454571.468081] ata7.00: cmd 61/00:c8:9b:ca:1f/0a:00:00:00:00/40 tag 25 ncq dma 1310720 ou
[454571.472260] ata7.00: status: { DRDY }
[454571.474344] ata7: hard resetting linkAnyway, all is now good with update-desktop-database. i'm going to mark this thread 'solved',
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