linux-ext4 - [Bug 219283] kernel regression with ext4 and ea_inode mount flags and exercising xattrs (between Linux 6.8 and 6.11)

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Message-ID: <bug-219283-13602-GQCYQAetRh@https.bugzilla.kernel.org/>
Date: Tue, 17 Sep 2024 18:13:43 +0000
From: bugzilla-daemon@...nel.org
To: linux-ext4@...r.kernel.org
Subject: [Bug 219283] kernel regression with ext4 and ea_inode mount flags
 and exercising xattrs (between Linux 6.8 and 6.11)

https://bugzilla.kernel.org/show_bug.cgi?id=219283

--- Comment #7 from Colin Ian King (colin.i.king@...il.com) ---
$ git bisect bad
0a46ef234756dca04623b7591e8ebb3440622f0b is the first bad commit
commit 0a46ef234756dca04623b7591e8ebb3440622f0b (HEAD)
Author: Jan Kara <jack@...e.cz>
Date:   Thu Mar 21 17:26:50 2024 +0100

    ext4: do not create EA inode under buffer lock

    ext4_xattr_set_entry() creates new EA inodes while holding buffer lock
    on the external xattr block. This is problematic as it nests all the
    allocation locking (which acquires locks on other buffers) under the
    buffer lock. This can even deadlock when the filesystem is corrupted and
    e.g. quota file is setup to contain xattr block as data block. Move the
    allocation of EA inode out of ext4_xattr_set_entry() into the callers.

    Reported-by: syzbot+a43d4f48b8397d0e41a9@...kaller.appspotmail.com
    Signed-off-by: Jan Kara <jack@...e.cz>
    Link: https://lore.kernel.org/r/20240321162657.27420-2-jack@suse.cz
    Signed-off-by: Theodore Ts'o <tytso@....edu>

 fs/ext4/xattr.c | 113
++++++++++++++++++++++++++++++++++---------------------------------------
 1 file changed, 53 insertions(+), 60 deletions(-)

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