linux-kernel - [syzbot] [afs?] WARNING: lock held when returning to user space in afs_proc_addr_prefs

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Message-ID: <676c7f0d.050a0220.2f3838.03bb.GAE@google.com>
Date: Wed, 25 Dec 2024 13:54:21 -0800
From: syzbot <syzbot+76f33569875eb708e575@...kaller.appspotmail.com>
To: dhowells@...hat.com, linux-afs@...ts.infradead.org, 
	linux-kernel@...r.kernel.org, marc.dionne@...istor.com, 
	syzkaller-bugs@...glegroups.com
Subject: [syzbot] [afs?] WARNING: lock held when returning to user space in afs_proc_addr_prefs_write

Hello,

syzbot found the following issue on:

HEAD commit:    499551201b5f Merge tag 'arm64-fixes' of git://git.kernel.o..
git tree:       upstream
console output: https://syzkaller.appspot.com/x/log.txt?x=153420c4580000
kernel config:  https://syzkaller.appspot.com/x/.config?x=c22efbd20f8da769
dashboard link: https://syzkaller.appspot.com/bug?extid=76f33569875eb708e575
compiler:       gcc (Debian 12.2.0-14) 12.2.0, GNU ld (GNU Binutils for Debian) 2.40
syz repro:      https://syzkaller.appspot.com/x/repro.syz?x=1503ef30580000
C reproducer:   https://syzkaller.appspot.com/x/repro.c?x=17d33cf8580000

Downloadable assets:
disk image: https://storage.googleapis.com/syzbot-assets/5ee1fc255de9/disk-49955120.raw.xz
vmlinux: https://storage.googleapis.com/syzbot-assets/24f10c9fac9a/vmlinux-49955120.xz
kernel image: https://storage.googleapis.com/syzbot-assets/211e35102c2e/bzImage-49955120.xz

IMPORTANT: if you fix the issue, please add the following tag to the commit:
Reported-by: syzbot+76f33569875eb708e575@...kaller.appspotmail.com

netdevsim netdevsim0 netdevsim1: set [1, 0] type 2 family 0 port 6081 - 0
netdevsim netdevsim0 netdevsim2: set [1, 0] type 2 family 0 port 6081 - 0
netdevsim netdevsim0 netdevsim3: set [1, 0] type 2 family 0 port 6081 - 0
kafs: addr_prefs: Too many elements in string
================================================
WARNING: lock held when returning to user space!
6.13.0-rc3-syzkaller-00209-g499551201b5f #0 Not tainted
------------------------------------------------
syz-executor133/5823 is leaving the kernel with locks still held!
1 lock held by syz-executor133/5823:
 #0: ffff888071cffc00 (&sb->s_type->i_mutex_key#9){++++}-{4:4}, at: inode_lock include/linux/fs.h:818 [inline]
 #0: ffff888071cffc00 (&sb->s_type->i_mutex_key#9){++++}-{4:4}, at: afs_proc_addr_prefs_write+0x2bb/0x14e0 fs/afs/addr_prefs.c:388


---
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