netdev - Re: [RFC PATCH 0/5] nfsd/sunrpc: cleanup resource with sync mode

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Message-ID: <173444730015.11407.7732863315759421903.b4-ty@oracle.com>
Date: Tue, 17 Dec 2024 09:55:51 -0500
From: cel@...nel.org
To: jlayton@...nel.org,
	neilb@...e.de,
	okorniev@...hat.com,
	Dai.Ngo@...cle.com,
	tom@...pey.com,
	trondmy@...nel.org,
	anna@...nel.org,
	linux-nfs@...r.kernel.org,
	netdev@...r.kernel.org,
	Yang Erkun <yangerkun@...weicloud.com>
Cc: Chuck Lever <chuck.lever@...cle.com>,
	yangerkun@...wei.com,
	yi.zhang@...wei.com
Subject: Re: [RFC PATCH 0/5] nfsd/sunrpc: cleanup resource with sync mode

From: Chuck Lever <chuck.lever@...cle.com>

On Mon, 16 Dec 2024 22:21:51 +0800, Yang Erkun wrote:
> After f8c989a0c89a ("nfsd: release svc_expkey/svc_export with
> rcu_work"), svc_export_put/expkey_put will call path_put with async
> mode. This can lead some unexpected failure:
> 
> mkdir /mnt/sda
> mkfs.xfs -f /dev/sda
> echo "/ *(rw,no_root_squash,fsid=0)" > /etc/exports
> echo "/mnt *(rw,no_root_squash,fsid=1)" >> /etc/exports
> exportfs -ra
> service nfs-server start
> mount -t nfs -o vers=4.0 127.0.0.1:/mnt /mnt1
> mount /dev/sda /mnt/sda
> touch /mnt1/sda/file
> exportfs -r
> umount /mnt/sda # failed unexcepted
> 
> [...]

Applied to nfsd-fixes for v6.13, thanks!

[1/5] nfsd: Revert "nfsd: release svc_expkey/svc_export with rcu_work"
      commit: 69d803c40edeaf94089fbc8751c9b746cdc35044

--
Chuck Lever