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

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Message-ID: <xQVfdQl4QH2gCXCc1p3b183RlIulJzqZJfFUGwXVjzolxMXDJpacKVIHo-93VLFNbQWPjRJiR30Np_rLudFr49uNZxlKeZwkfhWH1qeiGhc=@tylerwross.com>
Date: Mon, 17 Nov 2025 18:38:57 +0000
From: "Tyler W. Ross" <TWR@...erwross.com>
To: Chuck Lever <chuck.lever@...cle.com>
Cc: Trond Myklebust <trondmy@...nel.org>, Anna Schumaker <anna@...nel.org>, 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>, 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 Monday, November 17th, 2025 at 6:41 AM, Chuck Lever <chuck.lever@...cle.com> wrote:

> > Is this gssd mishandling some setup/initialization?
> > Or is there a miscalculation happening somewhere further up?
> 
> Does Debian's user space Kerberos support the sha2 enctypes?

Appears to. MIT Kerberos docs list sha2 enctypes support on releases
>=1.15 . Debian 13 and Fedora 43 are both shipping 1.21.3 . Debian
unstable currently has 1.22.1 . I haven't had any issues managing
sha2 keytabs, tickets, etc. with the userspace tools. And at least some
NFS operations other than READDIR do seem to work, though I haven't
tested that beyond observing cat, stat, and touch are functional.

TWR