Possible kafs related regression

[Jeffrey E Altman]

On 2/15/2024 8:44 AM, Jeffrey E Altman wrote:
> On 2/15/2024 6:48 AM, markus.suvanto at gmail.com wrote:
>> Dear all
>>
>> Compiling code under /afs filesystem using make causes hang.
>> For me this is regression and the latest working version was 6.7.2
>> (at least I never hit this when I was using 6.7.2)
>> I have not bisected this but first not working version was 6.7.3
>> and 6.7.4 hangs also.
>>
>> I have not tested this using 6.8-rc4
>>
>> https://bugzilla.kernel.org/show_bug.cgi?id=218496
>>
>> -Markus Suvanto
>
> Markus,
>
> There is a known bug in all of the 6.7 kernels that breaks AFS 
> communication on various networks.
>
> This was discussed by myself and Michael Lass on openafs-devel. A fix 
> was merged into 6.8-rc2 and 6.7.5-rc1.
>
> The symptom are FetchData and StoreData calls that stall because the 
> kernel drops the incoming udp packets. A stall when reading a 
> directory would be consistent with that bug.
>
> Jeffrey Altman

This commit is the fix for the mentioned issue.

commit fe92f874f09145a6951deacaa4961390238bbe0d
Author: Michael Lass <bevan at bi-co.net>
Date:   Wed Jan 31 16:52:20 2024 +0100

     net: Fix from address in memcpy_to_iter_csum()

     While inlining csum_and_memcpy() into memcpy_to_iter_csum(), the from
     address passed to csum_partial_copy_nocheck() was accidentally changed.
     This causes a regression in applications using UDP, as for example
     OpenAFS, causing loss of datagrams.

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