Bug#1120598: ls input/output error ("NFS: readdir(/) returns -5") on krb5 NFSv4 client using SHA2

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From	"Tyler W. Ross" <TWR@tylerwross.com>
Newsgroups	linux.debian.bugs.dist, linux.kernel, linux.debian.kernel
Subject	Bug#1120598: ls input/output error ("NFS: readdir(/) returns -5") on krb5 NFSv4 client using SHA2
Date	Tue, 18 Nov 2025 05:20:01 +0100
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X-Original-Cc	Trond Myklebust <trondmy@kernel.org>, Chuck Lever <chuck.lever@oracle.com>, Anna Schumaker <anna@kernel.org>, Salvatore Bonaccorso <carnil@debian.org>, "1120598@bugs.debian.org" <1120598@bugs.debian.org>, Jeff Layton <jlayton@kernel.org>, NeilBrown <neil@brown.name>, Steve Dickson <steved@redhat.com>, Olga Kornievskaia <okorniev@redhat.com>, Dai Ngo <Dai.Ngo@oracle.com>, Tom Talpey <tom@talpey.com>, linux-nfs@vger.kernel.org, linux-kernel@vger.kernel.org
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Cross-posted to 3 groups.

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On 11/17/25 3:54 PM, Scott Mayhew wrote:
> FWIW I have both Debian Trixie and Sid/Forky VMs, and krb5{,i,p} is
> working across the board for me.  Normally I just use a plain MIT KDC,
> so I tried IPA and that works fine too.

Did you confirm the enctype used?

My repro steps, from initial mounted state:
kinit
kvno -e aes256-cts-hmac-sha384-192 <nfs spn>
ls /mnt/example

On my Debian Sid VM, if I do kinit and then immediately ls, the issue 
does not occur. klist shows the acquired service ticket has an
aes256-cts-hmac-sha1-96 session key.

TWR

Thread

Bug#1120598: nfs-common: ls input/output error ("NFS: readdir(/) returns -5") on krb5 NFSv4 client using SHA2 "Tyler W. Ross" <twr+debbugs@tylerwross.com> - 2025-11-12 22:50 +0100
  Bug#1120598: ls input/output error ("NFS: readdir(/) returns -5") on krb5 NFSv4 client using SHA2 Salvatore Bonaccorso <carnil@debian.org> - 2025-11-13 06:10 +0100
  Bug#1120598: ls input/output error ("NFS: readdir(/) returns -5") on krb5 NFSv4 client using SHA2 "Tyler W. Ross" <TWR@tylerwross.com> - 2025-11-13 18:20 +0100
  Bug#1120598: ls input/output error ("NFS: readdir(/) returns -5") on krb5 NFSv4 client using SHA2 "Tyler W. Ross" <TWR@tylerwross.com> - 2025-11-13 19:10 +0100
  Bug#1120598: ls input/output error ("NFS: readdir(/) returns -5") on krb5 NFSv4 client using SHA2 "Tyler W. Ross" <TWR@tylerwross.com> - 2025-11-13 20:00 +0100
  Bug#1120598: ls input/output error ("NFS: readdir(/) returns -5") on krb5 NFSv4 client using SHA2 "Tyler W. Ross" <TWR@tylerwross.com> - 2025-11-14 05:40 +0100
    Bug#1120598: ls input/output error ("NFS: readdir(/) returns -5") on krb5 NFSv4 client using SHA2 "Tyler W. Ross" <TWR@tylerwross.com> - 2025-11-14 06:20 +0100
  Bug#1120598: ls input/output error ("NFS: readdir(/) returns -5") on krb5 NFSv4 client using SHA2 "Tyler W. Ross" <TWR@tylerwross.com> - 2025-11-16 01:50 +0100
  Bug#1120598: ls input/output error ("NFS: readdir(/) returns -5") on krb5 NFSv4 client using SHA2 Trond Myklebust <trondmy@kernel.org> - 2025-11-16 19:30 +0100
    Bug#1120598: ls input/output error ("NFS: readdir(/) returns -5") on krb5 NFSv4 client using SHA2 "Tyler W. Ross" <TWR@tylerwross.com> - 2025-11-17 06:30 +0100
      Bug#1120598: ls input/output error ("NFS: readdir(/) returns -5") on krb5 NFSv4 client using SHA2 Scott Mayhew <smayhew@redhat.com> - 2025-11-18 00:10 +0100
    Bug#1120598: ls input/output error ("NFS: readdir(/) returns -5") on krb5 NFSv4 client using SHA2 Scott Mayhew <smayhew@redhat.com> - 2025-11-18 00:10 +0100
      Bug#1120598: ls input/output error ("NFS: readdir(/) returns -5") on krb5 NFSv4 client using SHA2 "Tyler W. Ross" <TWR@tylerwross.com> - 2025-11-18 05:20 +0100
        Bug#1120598: ls input/output error ("NFS: readdir(/) returns -5") on krb5 NFSv4 client using SHA2 Scott Mayhew <smayhew@redhat.com> - 2025-11-18 19:00 +0100
          Bug#1120598: ls input/output error ("NFS: readdir(/) returns -5") on krb5 NFSv4 client using SHA2 "Tyler W. Ross" <TWR@tylerwross.com> - 2025-11-19 00:50 +0100
  Bug#1120598: ls input/output error ("NFS: readdir(/) returns -5") on krb5 NFSv4 client using SHA2 "Tyler W. Ross" <TWR@tylerwross.com> - 2025-11-17 19:50 +0100
  Bug#1120598: ls input/output error ("NFS: readdir(/) returns -5") on krb5 NFSv4 client using SHA2 "Tyler W. Ross" <TWR@tylerwross.com> - 2025-11-18 05:40 +0100
  Bug#1120598: ls input/output error ("NFS: readdir(/) returns -5") on krb5 NFSv4 client using SHA2 Scott Mayhew <smayhew@redhat.com> - 2025-11-19 14:40 +0100
  Bug#1120598: ls input/output error ("NFS: readdir(/) returns -5") on krb5 NFSv4 client using SHA2 "Tyler W. Ross" <TWR@tylerwross.com> - 2025-11-19 18:30 +0100
  Bug#1120598: marked as done (nfs: ls input/output error ("NFS:  readdir(/) returns -5") on krb5 NFSv4 client using SHA2) "Debian Bug Tracking System" <owner@bugs.debian.org> - 2026-03-09 22:10 +0100

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