linux-kernel - Re: [syzbot] [gfs2?] WARNING in chown

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Message-ID: <68f20a43.a70a0220.b3ac9.0029.GAE@google.com>
Date: Fri, 17 Oct 2025 02:20:03 -0700
From: syzbot <syzbot+04c2672c56fbb9401640@...kaller.appspotmail.com>
To: kartikey406@...il.com, linux-kernel@...r.kernel.org, 
	syzkaller-bugs@...glegroups.com, yzbot@...kaller.appspotmail.com
Subject: Re: [syzbot] [gfs2?] WARNING in chown_common

Hello,

syzbot has tested the proposed patch but the reproducer is still triggering an issue:
WARNING in chown_common

WARNING: CPU: 0 PID: 5970 at kernel/locking/rwsem.c:1381 __up_write kernel/locking/rwsem.c:1380 [inline]
WARNING: CPU: 0 PID: 5970 at kernel/locking/rwsem.c:1381 up_write+0x3a2/0x420 kernel/locking/rwsem.c:1643
Modules linked in:
CPU: 0 UID: 0 PID: 5970 Comm: syz.0.17 Not tainted syzkaller #0 PREEMPT(full) 
Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.3-debian-1.16.3-2~bpo12+1 04/01/2014
RIP: 0010:__up_write kernel/locking/rwsem.c:1380 [inline]
RIP: 0010:up_write+0x3a2/0x420 kernel/locking/rwsem.c:1643
Code: d0 48 c7 c7 20 ff 6a 8b 48 c7 c6 40 01 6b 8b 48 8b 14 24 4c 89 f1 4d 89 e0 4c 8b 4c 24 08 41 52 e8 b3 36 e6 ff 48 83 c4 08 90 <0f> 0b 90 90 e9 6d fd ff ff 48 c7 c1 94 6e 9e 8f 80 e1 07 80 c1 03
RSP: 0018:ffffc9000d497c50 EFLAGS: 00010296
RAX: 29f4d5975a11a300 RBX: ffff888043da5058 RCX: ffff888034730000
RDX: 0000000000000000 RSI: 0000000000000001 RDI: 0000000000000002
RBP: dffffc0000000000 R08: 0000000000000003 R09: 0000000000000004
R10: dffffc0000000000 R11: fffffbfff1bfa650 R12: 0000000000000000
R13: ffff888043da50b0 R14: ffff888043da5058 R15: 1ffff110087b4a0c
FS:  00007f49f65fe6c0(0000) GS:ffff88808d300000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 000000c005567000 CR3: 0000000058d8f000 CR4: 0000000000352ef0
Call Trace:
 <TASK>
 inode_unlock include/linux/fs.h:990 [inline]
 chown_common+0x3fb/0x580 fs/open.c:794
 do_fchownat+0x161/0x270 fs/open.c:823
 __do_sys_lchown fs/open.c:848 [inline]
 __se_sys_lchown fs/open.c:846 [inline]
 __x64_sys_lchown+0x85/0xa0 fs/open.c:846
 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
 do_syscall_64+0xfa/0xfa0 arch/x86/entry/syscall_64.c:94
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f49f6f8eec9
Code: ff ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 40 00 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 c7 c1 a8 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007f49f65fe038 EFLAGS: 00000246 ORIG_RAX: 000000000000005e
RAX: ffffffffffffffda RBX: 00007f49f71e6270 RCX: 00007f49f6f8eec9
RDX: 000000000000ee01 RSI: 0000000000000000 RDI: 00002000000006c0
RBP: 00007f49f7011f91 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007f49f71e6308 R14: 00007f49f71e6270 R15: 00007fff9d14f498
 </TASK>


Tested on:

commit:         98ac9cc4 Merge tag 'f2fs-fix-6.18-rc2' of git://git.ke..
git tree:       upstream
console output: https://syzkaller.appspot.com/x/log.txt?x=171475e2580000
kernel config:  https://syzkaller.appspot.com/x/.config?x=c2d7b4143707d3a0
dashboard link: https://syzkaller.appspot.com/bug?extid=04c2672c56fbb9401640
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=1448b67c580000