[Bug 2060780] Re: CIFS stopped working/is unstable with kernel update to 5.15.0-102.112

This bug is awaiting verification that the linux-xilinx-
zynqmp/5.15.0-1029.33 kernel in -proposed solves the problem. Please
test the kernel and update this bug with the results. If the problem is
solved, change the tag 'verification-needed-jammy-linux-xilinx-zynqmp'
to 'verification-done-jammy-linux-xilinx-zynqmp'. If the problem still
exists, change the tag 'verification-needed-jammy-linux-xilinx-zynqmp'
to 'verification-failed-jammy-linux-xilinx-zynqmp'.


If verification is not done by 5 working days from today, this fix will
be dropped from the source code, and this bug will be closed.


See https://wiki.ubuntu.com/Testing/EnableProposed for documentation how
to enable and use -proposed. Thank you!


** Tags added: kernel-spammed-jammy-linux-xilinx-zynqmp-v2 verification-needed-jammy-linux-xilinx-zynqmp

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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

Status in linux package in Ubuntu:
Invalid
Status in linux source package in Jammy:
Fix Released

Bug description:
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

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