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Date:   Fri, 17 Jul 2020 13:34:11 -0400
From:   Chuck Lever <>
To:     Pierre Sauter <>
Cc:     Kai-Heng Feng <>,,
        linux-stable <>,
        Linux NFS Mailing List <>,
        "open list:NETWORKING DRIVERS" <>,
        open list <>,
Subject: Re: [Regression] "SUNRPC: Add "@len" parameter to gss_unwrap()"
 breaks NFS Kerberos on upstream stable 5.4.y

> On Jul 17, 2020, at 1:29 PM, Pierre Sauter <> wrote:
> Hi Chuck,
> Am Donnerstag, 16. Juli 2020, 21:25:40 CEST schrieb Chuck Lever:
>> So this makes me think there's a possibility you are not using upstream
>> stable kernels. I can't help if I don't know what source code and commit
>> stream you are using. It also makes me question the bisect result.
> Yes you are right, I was referring to Ubuntu kernels 5.4.0-XX. From the
> discussion in the Ubuntu bugtracker I got the impression that Ubuntu kernels
> 5.4.0-XX and upstream 5.4.XX are closely related, obviously they are not. The
> bisection was done by the original bug reporter and also refers to the Ubuntu
> kernel.
> In the meantime I tested v5.4.51 upstream, which shows no problems. Sorry for
> the bother.

Pierre, thanks for confirming!

Kai-Heng suspected an upstream stable commit that is missing in 5.4.0-40,
but I don't have any good suggestions.

>>> My krb5 etype is aes256-cts-hmac-sha1-96.
>> Thanks! And what is your NFS server and filesystem? It's possible that the
>> client is not estimating the size of the reply correctly. Variables include
>> the size of file handles, MIC verifiers, and wrap tokens.
> The server is Debian with v4.19.130 upstream, filesystem ext4.
>> You might try:
>> e8d70b321ecc ("SUNRPC: Fix another issue with MIC buffer space")
> That one is actually in Ubuntus 5.4.0-40, from looking at the code.

Chuck Lever

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