linux-kernel - Re: ls input/output error ("NFS: readdir(/) returns -5") on krb5 NFSv4 client using SHA2

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Message-ID: <fVv3cF7Ulh3cKUP17C98gh_uOv9BcMlMpsIh1Nv5_0tdw-75PKiPJgIEP5o2jBVry7orwz7jeiGQenfCbuUxyj5JFstbx3RTFYr223qDmV0=@tylerwross.com>
Date: Fri, 14 Nov 2025 05:09:08 +0000
From: "Tyler W. Ross" <TWR@...erwross.com>
To: Chuck Lever <chuck.lever@...cle.com>
Cc: Salvatore Bonaccorso <carnil@...ian.org>, "1120598@...s.debian.org" <1120598@...s.debian.org>, Jeff Layton <jlayton@...nel.org>, NeilBrown <neil@...wn.name>, Scott Mayhew <smayhew@...hat.com>, Steve Dickson <steved@...hat.com>, Olga Kornievskaia <okorniev@...hat.com>, Dai Ngo <Dai.Ngo@...cle.com>, Tom Talpey <tom@...pey.com>, Trond Myklebust <trondmy@...nel.org>, Anna Schumaker <anna@...nel.org>, linux-nfs@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: ls input/output error ("NFS: readdir(/) returns -5") on krb5 NFSv4 client using SHA2

On Thursday, November 13th, 2025 at 9:35 PM, Tyler W. Ross <TWR@...erwross.com> wrote:

> I tried a couple vanilla/stock kernels today, without success.
> 
> Most notably, I built 6.17.8 from upstream using the Kconfig from the
> working Fedora 43 client in my lab ("config-6.17.5-300.fc43.x86_64").
> 
> Unfortunately, the rpc_xdr_overflow still occurs with this kernel.

Quick addendum:

I had not tried Debian 12, because CONFIG_RPCSEC_GSS_KRB5_ENCTYPES_AES_SHA2
was not enabled in the shipped Kconfig.

I just spun up a Debian 12 VM and installed the aforementioned
upstream 6.17.8 with Fedora 43 Kconfig kernel and confirmed the issue
also occurs on Debian 12.

TWR