Comment # 47 on bug 1209457 from Neil Brown

(In reply to St���phane DESNEUX from comment #44)

> kernel .55 has been released after 22/Mar/2023 as reported by uname:
> 
> # uname -a
> Linux <hostname> 5.14.21-150400.24.55-default #1 SMP PREEMPT_DYNAMIC Mon Mar
> 27 15:25:48 UTC 2023 (cc75cf8) x86_64 x86_64 x86_64 GNU/Linux

Unfortunately this release doesn't contain the fix.  It was released Mar 27,
but only includes patches submitted up to Mar 21.  So the fix I submitted the
next day missed out :-(
I think another update is expected in a week or so.

> 
> Is it the correct release date? If so, maybe the fix occurred later? I'll
> try to dig in https://github.com/SUSE/kernel/tree/SLE15-SP4 ...
> 
> As mentioned here https://forum.qnap.com/viewtopic.php?f=35&t=165385 , a
> workaround is to force the protocol version to 4:
> 
> # mount -t nfs nas:/Web /mnt/tmp/                 => FAILS
> # mount -o nfsvers=4 -t nfs nas:/Web /mnt/tmp/    => OK
> # mount -o nfsvers=4.0 -t nfs nas:/Web /mnt/tmp/  => OK

Yes, the QNAP bug only triggers for NFS version 4.1 and later

I'm sorry about this.  The patch which trigger the bug only landed in SLE very
recently as a bugfix for another problem. I actually knew about the problem
with QNAS, but I didn't put 2 and 2 together when I was processing a set of
bugfixes from upstream into our SUSE kernels. I should have caught it and made
sure the fix-for-the-fix landed at the same time.  But I didn't. Sorry.