Bug#1076448: linux: Update from 5.10.218 to 5.10.221 breaks NFS re-exports

From	Sven-Haegar Koch <haegar@sdinet.de>
Newsgroups	linux.debian.bugs.dist, linux.debian.kernel
Subject	Bug#1076448: linux: Update from 5.10.218 to 5.10.221 breaks NFS re-exports
Date	2024-07-16 16:10 +0200
Message-ID	<J0R2p-2xzI-3@gated-at.bofh.it> (permalink)
Organization	linux.* mail to news gateway

Cross-posted to 2 groups.

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Source: linux
Version: 5.10.221-1
Severity: normal
X-Debbugs-Cc: haegar@sdinet.de

Updating from Debian Bullseye 5.10.218-1 to 5.10.221-1 broke our NFS 
server.

The server mounts some NFS directories from a NAS, and re-exports them 
(and more) to other servers.

With 5.10.218-1 everything worked just fine.

But with 5.10.221-1 (most likeley because of the big NFS backports in 
5.10.220) starting the nfs-server.service breaks with

Jul 16 12:58:56 mytest-sh exportfs[2071]: exportfs: /media/nfsroot/pvsbackup does not support NFS export


We were using the normal Debian Bullseye nfs-kernel-server package:

Package: nfs-kernel-server
Version: 1:1.3.4-6

NFS Mount via /etc/fstab:
10.1.2.3:/pvsbackup /media/nfsroot/pvsbackup     nfs  rw,bg,hard,timeo=600,proto=tcp,retrans=2 0 0

NFS export in /etc/exports
/media/nfsroot/pvsbackup 10.4.5.6/32(rw,no_root_squash,no_subtree_check,fsid=61cb2589-1805-438a-9bd7-7baf0daabfd2)


In the wiki page https://wiki.linux-nfs.org/wiki/index.php/NFS_re-export 
I found the comment "You'll need nfs-utils at least 1.3.5 (specifically, 
3f520e8f6f5 "exportfs: Make sure pass all valid export flags to nfsd"). 
Otherwise, on recent kernels, attempts to re-export NFS will likely 
result in "exportfs: <path> does not support NFS export". - and the 
Debian  Bullseye nfs-utils packages based in 1.3.4 do not satisfy this.

Seems since the NFS backports 5.10.220 can be seen as "recent kernels", 
while the previous 5.10.218 not yet.

For testing I recompiled/backported the Debian Bookworm nfs-utils 
1:2.6.2-4 for Bullseye, and this totally fixes the problems.

So I think Debian Bullseye either needs these NFS kernel changes 
reverted, or its nfs-utils/nfs-kernel-server packages updated to include 
at least the missing commit.

Greetings,
Haegar


-- System Information:
Debian Release: 11.10
  APT prefers oldstable-updates
  APT policy: (500, 'oldstable-updates'), (500, 'oldstable-security'), 
(500, 'oldstable')
Architecture: amd64 (x86_64)

Kernel: Linux 5.10.0-31-amd64 (SMP w/2 CPU threads)
Locale: LANG=en_US.UTF-8, LC_CTYPE=de_DE.UTF-8 (charmap=UTF-8), 
LANGUAGE=en_US:en
Shell: /bin/sh linked to /usr/bin/bash
Init: systemd (via /run/systemd/system)
LSM: AppArmor: enabled

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Bug#1076448: linux: Update from 5.10.218 to 5.10.221 breaks NFS re-exports Sven-Haegar Koch <haegar@sdinet.de> - 2024-07-16 16:10 +0200
  Bug#1076448: linux: Update from 5.10.218 to 5.10.221 breaks NFS re-exports Salvatore Bonaccorso <carnil@debian.org> - 2024-07-16 16:50 +0200
    Bug#1076448: linux: Update from 5.10.218 to 5.10.221 breaks NFS re-exports Sven-Haegar Koch <haegar@sdinet.de> - 2024-07-16 17:10 +0200
      Bug#1076448: linux: Update from 5.10.218 to 5.10.221 breaks NFS re-exports Salvatore Bonaccorso <carnil@debian.org> - 2024-07-16 20:40 +0200
  Processed: Re: Bug#1076448: linux: Update from 5.10.218 to  5.10.221 breaks NFS re-exports "Debian Bug Tracking System" <owner@bugs.debian.org> - 2024-07-16 16:50 +0200
  Bug#1076448: marked as done (linux: Update from 5.10.218 to  5.10.221 breaks NFS re-exports) "Debian Bug Tracking System" <owner@bugs.debian.org> - 2024-07-16 23:00 +0200

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