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Date:   Wed, 15 Mar 2023 22:01:19 +0000
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To:     linux-nfs@vger.kernel.org
From:   Trevor Hemsley <trevor.hemsley@ntlworld.com>
Subject: Crash in nfsd on kernel > 5.19
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Hi

I am not subscribed to this list so please cc me on any replies.

I have a problem using a media player called Kodi when it plays a media 
file that is hosted on an NFS share. Reverting to 
kernel-5.19.16-200.fc36.x86_64 fixes the problem so I suspect this is a 
change made between 5.19 and 6.0.

I'm running libreelec 10.$latest as the client, which is distro 
specifically to allow kodi to run, and the problem is easily 
reproducible from there. All it takes is to play any movie/tv episode 
from an NFS share on a Fedora 36 host and attempt to fast forward the 
motion. Within a second or two, it crashes nfsd on the host. This 
started happening when Fedora updated from kernel 5.19.x to 6.0.x. My 
first crash was on kernel 6.0.9 and it has happened with each 6.0.x 
minor update and with 6.1.x since.

I raised a bugzilla entry 
https://bugzilla.redhat.com/show_bug.cgi?id=2148276 to report this and 
it has seen no traction. There are a few crashes detailed in the ticket. 
Several others have "me too'ed" that bugzilla and the latest example is 
from an untainted kernel 6.1.15-200.fc37.x86_64. I figure it's time to 
try reporting it here instead.

Am happy to test any patches if I can make them apply to the current 
Fedora 6.1.18 (latest) source

Trevor