samba - Dec 2020 - CIFS share hangs on Debian

Hi,

I'm seeing some issues CIFS mounts on systems running Debian 9 and 10.  The
Debian 9 system seems to have more issues, I suspect there is a kernel bug.
But when trying to write a file to a CIFS mount, I occasionally see errors
like:

[Thu Dec  3 11:08:32 2020] CIFS VFS: Server XXXXX has not responded in 120
seconds. Reconnecting...
[Thu Dec  3 11:08:32 2020] CIFS VFS: Free previous auth_key.response
ffff8be599d06800
[Thu Dec  3 16:33:47 2020] CIFS VFS: Close unmatched open
[Thu Dec  3 20:35:31 2020] CIFS VFS: Close unmatched open

The Debian 10 systems see the same reconnection and "Free previous
auth_key.response" messages but don't see the "Close unmatched
open"
messages.

I'm seeing some suggestions these issues are related to some potential
kernel bugs, but I'm not seeing any specific fixes for Debian, so perhaps I
should be inquiring via Debian channels, but I was wondering if anything
for certain?

-- 
Dale Harris
rodmur at gmail.com
/.-)

Dale Harris via samba <samba at lists.samba.org>
writes:
> The Debian 10 systems see the same reconnection and "Free previous
> auth_key.response" messages but don't see the "Close
unmatched open"
> messages.
The "Free previous" msg is harmless, there's a commit to only show
it on
increased debug levels that can be backported.

The "Close unmatched open" is potentially more problematic but it
depends on your kernel version and what did Debian backported on top of
it.

I would suggest trying a more recent kernel see if it still happens.
> I'm seeing some suggestions these issues are related to some potential
> kernel bugs, but I'm not seeing any specific fixes for Debian, so
perhaps I
> should be inquiring via Debian channels, but I was wondering if anything
> for certain?
For cifs.ko questions the kernel mailing list is a better place. See

https://wiki.samba.org/index.php/Bug_Reporting#cifs.ko

Cheers,
-- 
Aur?lien Aptel / SUSE Labs Samba Team
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