linux-kernel - Re: [syzbot] [ext4?] WARNING in ext4_xattr_inode_update

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Message-ID: <68cb8872.050a0220.2ff435.05a2.GAE@google.com>
Date: Wed, 17 Sep 2025 21:20:02 -0700
From: syzbot <syzbot+0be4f339a8218d2a5bb1@...kaller.appspotmail.com>
To: albinbabuvarghese20@...il.com, linux-kernel@...r.kernel.org, 
	syzkaller-bugs@...glegroups.com
Subject: Re: [syzbot] [ext4?] WARNING in ext4_xattr_inode_update_ref

Hello,

syzbot has tested the proposed patch but the reproducer is still triggering an issue:
WARNING: lock held when returning to user space in ext4_xattr_inode_update_ref

EXT4-fs (loop0): 1 orphan inode deleted
EXT4-fs (loop0): mounted filesystem 00000000-0000-0000-0000-000000000000 ro without journal. Quota mode: none.
================================================
WARNING: lock held when returning to user space!
syzkaller #0 Not tainted
------------------------------------------------
syz.0.17/6582 is leaving the kernel with locks still held!
1 lock held by syz.0.17/6582:
 #0: ffff88805849d798 (&sb->s_type->i_mutex_key#8/3){+.+.}-{4:4}, at: inode_lock_nested include/linux/fs.h:915 [inline]
 #0: ffff88805849d798 (&sb->s_type->i_mutex_key#8/3){+.+.}-{4:4}, at: ext4_xattr_inode_update_ref+0xad/0x650 fs/ext4/xattr.c:1025

Tested on:

commit:         592a93fe Merge tag '6.17-rc6-ksmbd-fixes' of git://git..
git tree:       upstream
console output: https://syzkaller.appspot.com/x/log.txt?x=13caef62580000
kernel config:  https://syzkaller.appspot.com/x/.config?x=f5b21423ca3f0a96
dashboard link: https://syzkaller.appspot.com/bug?extid=0be4f339a8218d2a5bb1
compiler:       Debian clang version 20.1.8 (++20250708063551+0c9f909b7976-1~exp1~20250708183702.136), Debian LLD 20.1.8
patch:          https://syzkaller.appspot.com/x/patch.diff?x=14c58712580000