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Date: Thu, 06 Jun 2024 06:38:03 -0700
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Subject: Re: [syzbot] [gfs2?] WARNING: locking bug in gfs2_fill_super
From: syzbot <syzbot+ee157488ade46c021ef4@syzkaller.appspotmail.com>
To: eadavis@qq.com, linux-kernel@vger.kernel.org, 
	syzkaller-bugs@googlegroups.com
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Hello,

syzbot has tested the proposed patch but the reproducer is still triggering=
 an issue:
WARNING: locking bug in gfs2_fill_super

loop0: detected capacity change from 0 to 32768
gfs2: fsid=3D(=EF=BF=BD[{{{+: Trying to join cluster "lock_nolock", "(=EF=
=BF=BD[{{{+"
gfs2: fsid=3D(=EF=BF=BD[{{{+: Now mounting FS (format 0)...
gfs2: fsid=3D(=EF=BF=BD[{{{+: can't read superblock: -22
------------[ cut here ]------------
DEBUG_LOCKS_WARN_ON(1)
WARNING: CPU: 0 PID: 5932 at kernel/locking/lockdep.c:233 hlock_class kerne=
l/locking/lockdep.c:233 [inline]
WARNING: CPU: 0 PID: 5932 at kernel/locking/lockdep.c:233 check_wait_contex=
t kernel/locking/lockdep.c:4824 [inline]
WARNING: CPU: 0 PID: 5932 at kernel/locking/lockdep.c:233 __lock_acquire+0x=
570/0x2000 kernel/locking/lockdep.c:5144
Modules linked in:
CPU: 0 PID: 5932 Comm: syz-executor Not tainted 6.10.0-rc1-next-20240529-sy=
zkaller-dirty #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Goo=
gle 04/02/2024
RIP: 0010:hlock_class kernel/locking/lockdep.c:233 [inline]
RIP: 0010:check_wait_context kernel/locking/lockdep.c:4824 [inline]
RIP: 0010:__lock_acquire+0x570/0x2000 kernel/locking/lockdep.c:5144
Code: 00 00 83 3d 81 3e 3b 0e 00 75 23 90 48 c7 c7 e0 b9 ca 8b 48 c7 c6 80 =
bc ca 8b e8 eb e3 e5 ff 48 ba 00 00 00 00 00 fc ff df 90 <0f> 0b 90 90 90 3=
1 db 48 81 c3 c4 00 00 00 48 89 d8 48 c1 e8 03 0f
RSP: 0018:ffffc9000347f590 EFLAGS: 00010046
RAX: 05742692f5fa7200 RBX: 0000000000000881 RCX: ffff88807e1fbc00
RDX: dffffc0000000000 RSI: 0000000000000000 RDI: 0000000000000000
RBP: 0000000000000005 R08: ffffffff81586802 R09: 1ffff1101728519a
R10: dffffc0000000000 R11: ffffed101728519b R12: ffff88807e1fc728
R13: ffff88807e1fc6d8 R14: ffff88807e1fc6d8 R15: ffff88807e1fbc00
FS:  00007fcda487d6c0(0000) GS:ffff8880b9400000(0000) knlGS:000000000000000=
0
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 000055ba9bc07131 CR3: 000000006858c000 CR4: 00000000003506f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 <TASK>
 lock_acquire+0x1ed/0x550 kernel/locking/lockdep.c:5817
 touch_wq_lockdep_map kernel/workqueue.c:3895 [inline]
 __flush_workqueue+0x1c9/0x1710 kernel/workqueue.c:3937
 gfs2_fill_super+0x1298/0x2530 fs/gfs2/ops_fstype.c:1311
 get_tree_bdev+0x3f7/0x570 fs/super.c:1615
 gfs2_get_tree+0x54/0x220 fs/gfs2/ops_fstype.c:1331
 vfs_get_tree+0x90/0x2a0 fs/super.c:1780
 do_new_mount+0x2be/0xb40 fs/namespace.c:3352
 do_mount fs/namespace.c:3692 [inline]
 __do_sys_mount fs/namespace.c:3898 [inline]
 __se_sys_mount+0x2d9/0x3c0 fs/namespace.c:3875
 do_syscall_x64 arch/x86/entry/common.c:52 [inline]
 do_syscall_64+0xf3/0x230 arch/x86/entry/common.c:83
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7fcda3a7e5ea
Code: d8 64 89 02 48 c7 c0 ff ff ff ff eb a6 e8 de 09 00 00 66 2e 0f 1f 84 =
00 00 00 00 00 0f 1f 40 00 49 89 ca b8 a5 00 00 00 0f 05 <48> 3d 01 f0 ff f=
f 73 01 c3 48 c7 c1 b0 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007fcda487cef8 EFLAGS: 00000246 ORIG_RAX: 00000000000000a5
RAX: ffffffffffffffda RBX: 00007fcda487cf80 RCX: 00007fcda3a7e5ea
RDX: 0000000020000000 RSI: 00000000200001c0 RDI: 00007fcda487cf40
RBP: 0000000020000000 R08: 00007fcda487cf80 R09: 0000000000008c1b
R10: 0000000000008c1b R11: 0000000000000246 R12: 00000000200001c0
R13: 00007fcda487cf40 R14: 000000000001279b R15: 0000000020000040
 </TASK>


Tested on:

commit:         9d99040b Add linux-next specific files for 20240529
git tree:       https://git.kernel.org/pub/scm/linux/kernel/git/next/linux-=
next.git
console output: https://syzkaller.appspot.com/x/log.txt?x=3D15541096980000
kernel config:  https://syzkaller.appspot.com/x/.config?x=3D735e953fee00ec1=
9
dashboard link: https://syzkaller.appspot.com/bug?extid=3Dee157488ade46c021=
ef4
compiler:       Debian clang version 15.0.6, GNU ld (GNU Binutils for Debia=
n) 2.40
patch:          https://syzkaller.appspot.com/x/patch.diff?x=3D16a4bfd69800=
00