linux-kernel - Re: [PATCH] fs/dcache: fix warning in ext4_xattr_inode_lookup

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Message-ID: <20240529020130.GK2118490@ZenIV>
Date: Wed, 29 May 2024 03:01:30 +0100
From: Al Viro <viro@...iv.linux.org.uk>
To: Edward Adam Davis <eadavis@...com>
Cc: syzbot+fe42a669c87e4a980051@...kaller.appspotmail.com,
	adilger.kernel@...ger.ca, linux-ext4@...r.kernel.org,
	linux-kernel@...r.kernel.org, syzkaller-bugs@...glegroups.com,
	tytso@....edu
Subject: Re: [PATCH] fs/dcache: fix warning in ext4_xattr_inode_lookup_create

On Wed, May 29, 2024 at 02:56:52AM +0100, Al Viro wrote:
> On Wed, May 29, 2024 at 09:15:02AM +0800, Edward Adam Davis wrote:
> > ext4_xattr_inode_lookup_create() will use s_root, so set it to NULL
> > after do_one_tree().
> 
> Why, in the name of everything unholy, would eviction of dentries need
> to set any kind of xattrs?

IOW, that might make the testcase STFU, but something odd is happening
there and I would really like to understand the details before we go
that way.