linux-kernel - [syzbot] WARNING in mark_buffer

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Date:   Mon, 04 Jul 2022 03:22:22 -0700
From:   syzbot <syzbot+2af3bc9585be7f23f290@...kaller.appspotmail.com>
To:     linux-fsdevel@...r.kernel.org, linux-kernel@...r.kernel.org,
        syzkaller-bugs@...glegroups.com, viro@...iv.linux.org.uk
Subject: [syzbot] WARNING in mark_buffer_dirty (4)

Hello,

syzbot found the following issue on:

HEAD commit:    d9b2ba67917c Merge tag 'platform-drivers-x86-v5.19-3' of g..
git tree:       upstream
console+strace: https://syzkaller.appspot.com/x/log.txt?x=15d5f0f0080000
kernel config:  https://syzkaller.appspot.com/x/.config?x=3a010dbf6a7af480
dashboard link: https://syzkaller.appspot.com/bug?extid=2af3bc9585be7f23f290
compiler:       gcc (Debian 10.2.1-6) 10.2.1 20210110, GNU ld (GNU Binutils for Debian) 2.35.2
syz repro:      https://syzkaller.appspot.com/x/repro.syz?x=14464f70080000
C reproducer:   https://syzkaller.appspot.com/x/repro.c?x=1779a598080000

Bisection is inconclusive: the first bad commit could be any of:

a1a98689301b drm: Add privacy-screen class (v4)
befe5404a00b drm/privacy-screen: Add X86 specific arch init code
107fe9043020 drm/connector: Add support for privacy-screen properties (v4)
8a12b170558a drm/privacy-screen: Add notifier support (v2)
334f74ee85dc drm/connector: Add a drm_connector privacy-screen helper functions (v2)

bisection log:  https://syzkaller.appspot.com/x/bisect.txt?x=14a2e85c080000

IMPORTANT: if you fix the issue, please add the following tag to the commit:
Reported-by: syzbot+2af3bc9585be7f23f290@...kaller.appspotmail.com

WARNING: CPU: 0 PID: 3647 at fs/buffer.c:1081 mark_buffer_dirty+0x59d/0xa20 fs/buffer.c:1081
Modules linked in:
CPU: 1 PID: 3647 Comm: syz-executor864 Not tainted 5.19.0-rc4-syzkaller-00036-gd9b2ba67917c #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
RIP: 0010:mark_buffer_dirty+0x59d/0xa20 fs/buffer.c:1081
Code: 89 ee 41 83 e6 01 4c 89 f6 e8 8f c2 94 ff 4d 85 f6 0f 84 7a fe ff ff e8 21 c6 94 ff 49 8d 5d ff e9 6c fe ff ff e8 13 c6 94 ff <0f> 0b e9 ac fa ff ff e8 07 c6 94 ff 0f 0b e9 d0 fa ff ff e8 fb c5
RSP: 0018:ffffc900030c7d30 EFLAGS: 00010293
RAX: 0000000000000000 RBX: ffff88806e7bda38 RCX: 0000000000000000
RDX: ffff888071720100 RSI: ffffffff81e4d16d RDI: 0000000000000001
RBP: 0000000000000000 R08: 0000000000000001 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000001 R12: ffff88807c21e7d8
R13: 0000000000000000 R14: 0000000000000000 R15: ffffed100f314eda
FS:  00007fe4fb903700(0000) GS:ffff8880b9b00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007fe4fb925000 CR3: 0000000079e8a000 CR4: 00000000003506e0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 <TASK>
 minix_put_super+0x199/0x500 fs/minix/inode.c:49
 generic_shutdown_super+0x14c/0x400 fs/super.c:462
 kill_block_super+0x97/0xf0 fs/super.c:1394
 deactivate_locked_super+0x94/0x160 fs/super.c:332
 deactivate_super+0xad/0xd0 fs/super.c:363
 cleanup_mnt+0x3a2/0x540 fs/namespace.c:1186
 task_work_run+0xdd/0x1a0 kernel/task_work.c:177
 ptrace_notify+0x114/0x140 kernel/signal.c:2353
 ptrace_report_syscall include/linux/ptrace.h:420 [inline]
 ptrace_report_syscall_exit include/linux/ptrace.h:482 [inline]
 syscall_exit_work kernel/entry/common.c:249 [inline]
 syscall_exit_to_user_mode_prepare+0xdb/0x230 kernel/entry/common.c:276
 __syscall_exit_to_user_mode_work kernel/entry/common.c:281 [inline]
 syscall_exit_to_user_mode+0x9/0x50 kernel/entry/common.c:294
 do_syscall_64+0x42/0xb0 arch/x86/entry/common.c:86
 entry_SYSCALL_64_after_hwframe+0x46/0xb0
RIP: 0033:0x7fe4fb9774c9
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 b8 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007fe4fb9032f8 EFLAGS: 00000246 ORIG_RAX: 00000000000000a5
RAX: ffffffffffffffec RBX: 00007fe4fb9fc3f0 RCX: 00007fe4fb9774c9
RDX: 0000000020000140 RSI: 00000000200000c0 RDI: 00000000200002c0
RBP: 00007fe4fb9c90a8 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0030656c69662f2e
R13: 6f6f6c2f7665642f R14: 000000807fffffff R15: 00007fe4fb9fc3f8
 </TASK>


---
This report is generated by a bot. It may contain errors.
See https://goo.gl/tpsmEJ for more information about syzbot.
syzbot engineers can be reached at syzkaller@...glegroups.com.

syzbot will keep track of this issue. See:
https://goo.gl/tpsmEJ#status for how to communicate with syzbot.
For information about bisection process see: https://goo.gl/tpsmEJ#bisection
syzbot can test patches for this issue, for details see:
https://goo.gl/tpsmEJ#testing-patches