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From: Salvatore Bonaccorso <carnil@debian.org>
Newsgroups: linux.debian.bugs.dist,linux.debian.kernel
Subject: Bug#1128861: Regression: Missing check in nfsd_permission() causes -ENOLCK No locks available
Date: Wed, 04 Mar 2026 11:40:01 +0100
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X-Original-Cc: Tj <tj.iam.tj@proton.me>, Neil Brown <neilb@suse.de>, linux-nfs@vger.kernel.org, Olga Kornievskaia <okorniev@redhat.com>, stable@vger.kernel.org, Chuck Lever <chuck.lever@oracle.com>, Jeff Layton <jlayton@kernel.org>
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Control: found -1 6.19.5-1~exp1
Hi,

On Fri, Feb 27, 2026 at 10:54:13AM +0100, Thorsten Leemhuis wrote:
> [CCing a few people and lists]
> 
> On 2/24/26 03:09, Tj wrote:
> > Upstream commit 4cc9b9f2bf4dfe13fe573 "nfsd: refine and rename 
> > NFSD_MAY_LOCK" and
> >   stable v6.12.54 commit 18744bc56b0ec
> 
> In case anyone just like me is wondering: the latter is a backport of
> the former.
> 
> >  (re)moves checks from  fs/nfsd/vfs.c::nfsd_permission().>   This causes NFS clients to see
> > 
> > $ flock -e -w 4 /srv/NAS/test/debian-13.3.0-amd64-netinst.iso sleep 1
> > flock: /srv/NAS/test/debian-13.3.0-amd64-netinst.iso: No locks available
> 
> Does this happen on mainline (e.g. 7.0-rc1) as well?

Not tested 7.0-rc2, but the issue is reproducible still in 6.19.5.

Regards,
Salvatore