linux-kernel - kernel BUG at fs/notify/dnotify/dnotify.c:LINE! (2)

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Date:   Mon, 23 Nov 2020 02:05:16 -0800
From:   syzbot <syzbot+f427adf9324b92652ccc@...kaller.appspotmail.com>
To:     amir73il@...il.com, jack@...e.cz, linux-fsdevel@...r.kernel.org,
        linux-kernel@...r.kernel.org, syzkaller-bugs@...glegroups.com
Subject: kernel BUG at fs/notify/dnotify/dnotify.c:LINE! (2)

Hello,

syzbot found the following issue on:

HEAD commit:    27bba9c5 Merge tag 'scsi-fixes' of git://git.kernel.org/pu..
git tree:       upstream
console output: https://syzkaller.appspot.com/x/log.txt?x=11b82225500000
kernel config:  https://syzkaller.appspot.com/x/.config?x=330f3436df12fd44
dashboard link: https://syzkaller.appspot.com/bug?extid=f427adf9324b92652ccc
compiler:       gcc (GCC) 10.1.0-syz 20200507
syz repro:      https://syzkaller.appspot.com/x/repro.syz?x=11d3f015500000
C reproducer:   https://syzkaller.appspot.com/x/repro.c?x=17162d4d500000

Bisection is inconclusive: the issue happens on the oldest tested release.

bisection log:  https://syzkaller.appspot.com/x/bisect.txt?x=16570525500000
final oops:     https://syzkaller.appspot.com/x/report.txt?x=15570525500000
console output: https://syzkaller.appspot.com/x/log.txt?x=11570525500000

IMPORTANT: if you fix the issue, please add the following tag to the commit:
Reported-by: syzbot+f427adf9324b92652ccc@...kaller.appspotmail.com

wlan1: Creating new IBSS network, BSSID 50:50:50:50:50:50
------------[ cut here ]------------
kernel BUG at fs/notify/dnotify/dnotify.c:118!
invalid opcode: 0000 [#1] PREEMPT SMP KASAN
CPU: 1 PID: 648 Comm: kworker/u4:4 Not tainted 5.10.0-rc4-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
Workqueue: events_unbound fsnotify_mark_destroy_workfn
RIP: 0010:dnotify_free_mark fs/notify/dnotify/dnotify.c:118 [inline]
RIP: 0010:dnotify_free_mark+0x4b/0x60 fs/notify/dnotify/dnotify.c:112
Code: 80 3c 02 00 75 26 48 83 bd 80 00 00 00 00 75 15 e8 0a d3 a0 ff 48 89 ee 48 8b 3d 68 8c 1d 0b 5d e9 aa 06 e2 ff e8 f5 d2 a0 ff <0f> 0b e8 ae 4d e2 ff eb d3 66 90 66 2e 0f 1f 84 00 00 00 00 00 41
RSP: 0018:ffffc90002f1fc38 EFLAGS: 00010293
RAX: 0000000000000000 RBX: ffffffff8958ae60 RCX: 1ffff920005e3f95
RDX: ffff888012601a40 RSI: ffffffff81cf5ceb RDI: ffff88801aea2080
RBP: ffff88801aea2000 R08: 0000000000000001 R09: ffffffff8ebb170f
R10: 0000000000000000 R11: 0000000000000000 R12: ffff8880171a2000
R13: ffffc90002f1fc98 R14: ffff88801aea2010 R15: ffff88801aea2018
FS:  0000000000000000(0000) GS:ffff8880b9f00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 000056045fa95978 CR3: 0000000012121000 CR4: 00000000001506e0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 fsnotify_final_mark_destroy+0x71/0xb0 fs/notify/mark.c:205
 fsnotify_mark_destroy_workfn+0x1eb/0x340 fs/notify/mark.c:840
 process_one_work+0x933/0x15a0 kernel/workqueue.c:2272
 worker_thread+0x64c/0x1120 kernel/workqueue.c:2418
 kthread+0x3af/0x4a0 kernel/kthread.c:292
 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:296
Modules linked in:


---
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