Public bug reported:
Hi,
updated some Ubuntu 22.04 systems to lastest available state this
morning, which caused CIFS mounts (from various fileservers) to stop
working. Kernel was updated to version 5.15.0-102-generic.
I can mount the shares without problems (mount -t cifs), but then, df for
example tells me: df: /mnt: Resource temporarily unavailable.
I'm able to list and browse all the files, but accessing them (even readonly)
is very unstable. Sometimes it works and sometimes it just gives me i/o errors.
Switching back to 5.15.0-101-generic or 5.15.0-100-generic solves the
problem and everything works again as expected.
Seems like some bug has been implemented in 5.15.0-102-generic...
To reproduce the problem, I started a while loop on one server to write
to some file on a specific mounted CIFS share and read it from another
one
root@<hostname1>:~# while true; do echo "$(date) hallo" >> /mnt/hallo.txt;
sleep 1 ; done
-bash: /mnt/hallo.txt: Input/output error
-bash: /mnt/hallo.txt: Input/output error
^C
root@<hostname2>:~$ tail -f /mnt/hallo.txt
Tue Apr 9 04:10:52 PM CEST 2024 hallo
Tue Apr 9 04:10:53 PM CEST 2024 hallo
Tue Apr 9 04:10:54 PM CEST 2024 hallo
Tue Apr 9 04:10:55 PM CEST 2024 hallo
Tue Apr 9 04:10:56 PM CEST 2024 hallo
Tue Apr 9 04:10:57 PM CEST 2024 hallo
Tue Apr 9 04:10:58 PM CEST 2024 hallo
Tue Apr 9 04:10:59 PM CEST 2024 hallo
Tue Apr 9 04:11:00 PM CEST 2024 hallo
Tue Apr 9 04:11:01 PM CEST 2024 hallo
tail: cannot determine location of '/mnt/hallo.txt'. reverting to polling:
Resource temporarily unavailable
Tue Apr 9 04:11:04 PM CEST 2024 hallo
Tue Apr 9 04:11:05 PM CEST 2024 hallo
Tue Apr 9 04:11:06 PM CEST 2024 hallo
Tue Apr 9 04:11:07 PM CEST 2024 hallo
Tue Apr 9 04:11:08 PM CEST 2024 hallo
Tue Apr 9 04:11:09 PM CEST 2024 hallo
Tue Apr 9 04:11:10 PM CEST 2024 hallo
While doing this, both servers tell me, the resource is unavailable
root@<hostname1>:~# df -h /mnt
df: /mnt: Resource temporarily unavailable
root@<hostname2>:~$ df -h /mnt
df: /mnt: Resource temporarily unavailable
** Affects: linux (Ubuntu)
Importance: Undecided
Status: New
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https://bugs.launchpad.net/bugs/2060780
Title:
CIFS stopped working/is unstable with kernel update to 5.15.0-102.112
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