[syzbot] WARNING in __cancel_work

[syzbot] WARNING in __cancel_work

[syzbot]

Hello,

syzbot found the following issue on:

HEAD commit:    7ebfc85e2cd7 Merge tag 'net-6.0-rc1' of git://git.kernel.o..
git tree:       upstream
console+strace: https://syzkaller.appspot.com/x/log.txt?x=176e9685080000
kernel config:  https://syzkaller.appspot.com/x/.config?x=20bc0b329895d963
dashboard link: https://syzkaller.appspot.com/bug?extid=10e37d0d88cbc2ea19e4
compiler:       Debian clang version 13.0.1-++20220126092033+75e33f71c2da-1~exp1~20220126212112.63, GNU ld (GNU Binutils for Debian) 2.35.2
syz repro:      https://syzkaller.appspot.com/x/repro.syz?x=13537803080000
C reproducer:   https://syzkaller.appspot.com/x/repro.c?x=12e68315080000

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

bisection log:  https://syzkaller.appspot.com/x/bisect.txt?x=1639b2a5080000
final oops:     https://syzkaller.appspot.com/x/report.txt?x=1539b2a5080000
console output: https://syzkaller.appspot.com/x/log.txt?x=1139b2a5080000

IMPORTANT: if you fix the issue, please add the following tag to the commit:
Reported-by: syzbot+10e37d0d88cbc2ea19e4@syzkaller.appspotmail.com

------------[ cut here ]------------
ODEBUG: assert_init not available (active state 0) object type: timer_list hint: 0x0
WARNING: CPU: 1 PID: 3621 at lib/debugobjects.c:505 debug_print_object lib/debugobjects.c:502 [inline]
WARNING: CPU: 1 PID: 3621 at lib/debugobjects.c:505 debug_object_assert_init+0x1fa/0x250 lib/debugobjects.c:892
Modules linked in:
CPU: 1 PID: 3621 Comm: syz-executor370 Not tainted 5.19.0-syzkaller-13930-g7ebfc85e2cd7 #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/22/2022
RIP: 0010:debug_print_object lib/debugobjects.c:502 [inline]
RIP: 0010:debug_object_assert_init+0x1fa/0x250 lib/debugobjects.c:892
Code: e8 db 3a a3 fd 4c 8b 45 00 48 c7 c7 c0 5e 0a 8b 48 c7 c6 c0 5b 0a 8b 48 c7 c2 60 60 0a 8b 31 c9 49 89 d9 31 c0 e8 86 73 17 fd <0f> 0b ff 05 da a3 eb 09 48 83 c5 38 48 89 e8 48 c1 e8 03 42 80 3c
RSP: 0018:ffffc90003d5f8d8 EFLAGS: 00010046
RAX: e412196666895900 RBX: 0000000000000000 RCX: ffff88801fda3b00
RDX: 0000000000000000 RSI: 0000000080000000 RDI: 0000000000000000
RBP: ffffffff8aafbf60 R08: ffffffff816d56dd R09: ffffed1017364f14
R10: ffffed1017364f14 R11: 1ffff11017364f13 R12: dffffc0000000000
R13: ffff8880253f3200 R14: 0000000000000002 R15: ffffffff91a40048
FS:  0000555556182300(0000) GS:ffff8880b9b00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 000000000045b630 CR3: 0000000070ee9000 CR4: 00000000003506e0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 <TASK>
 debug_timer_assert_init kernel/time/timer.c:792 [inline]
 debug_assert_init kernel/time/timer.c:837 [inline]
 del_timer+0xa5/0x3d0 kernel/time/timer.c:1257
 try_to_grab_pending+0x150/0x820 kernel/workqueue.c:1275
 __cancel_work+0xb8/0x380 kernel/workqueue.c:3250
 l2cap_clear_timer include/net/bluetooth/l2cap.h:884 [inline]
 l2cap_chan_del+0x41c/0x610 net/bluetooth/l2cap_core.c:688
 l2cap_sock_shutdown+0x39f/0x860 net/bluetooth/l2cap_sock.c:1377
 l2cap_sock_release+0x68/0x1c0 net/bluetooth/l2cap_sock.c:1420
 __sock_release net/socket.c:650 [inline]
 sock_close+0xd7/0x260 net/socket.c:1365
 __fput+0x3b9/0x820 fs/file_table.c:320
 task_work_run+0x146/0x1c0 kernel/task_work.c:177
 ptrace_notify+0x29a/0x340 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+0x8c/0xe0 kernel/entry/common.c:249
 syscall_exit_to_user_mode_prepare+0x6b/0xc0 kernel/entry/common.c:276
 __syscall_exit_to_user_mode_work kernel/entry/common.c:281 [inline]
 syscall_exit_to_user_mode+0xa/0x60 kernel/entry/common.c:294
 entry_SYSCALL_64_after_hwframe+0x63/0xcd
RIP: 0033:0x7f4b18cac08b
Code: 0f 05 48 3d 00 f0 ff ff 77 45 c3 0f 1f 40 00 48 83 ec 18 89 7c 24 0c e8 63 fc ff ff 8b 7c 24 0c 41 89 c0 b8 03 00 00 00 0f 05 <48> 3d 00 f0 ff ff 77 35 44 89 c7 89 44 24 0c e8 a1 fc ff ff 8b 44
RSP: 002b:00007ffe515692a0 EFLAGS: 00000293 ORIG_RAX: 0000000000000003
RAX: 0000000000000000 RBX: 0000000000000005 RCX: 00007f4b18cac08b
RDX: ffffffffffffffb8 RSI: 0000000020000000 RDI: 0000000000000004
RBP: 0000000000000003 R08: 0000000000000000 R09: 000000ff00000001
R10: 0000000000000004 R11: 0000000000000293 R12: 00005555561822b8
R13: 0000000000000009 R14: 00007ffe51569310 R15: 0000000000000003
 </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@googlegroups.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

Re: [syzbot] WARNING in __cancel_work

[syzbot]

syzbot suspects this issue was fixed by commit:

commit 2d2cb3066f2c90cd8ca540b36ba7a55e7f2406e0
Author: Tetsuo Handa <penguin-kernel@I-love.SAKURA.ne.jp>
Date:   Sat Sep 3 15:32:56 2022 +0000

    Bluetooth: L2CAP: initialize delayed works at l2cap_chan_create()

bisection log:  https://syzkaller.appspot.com/x/bisect.txt?x=1469d541880000
start commit:   7ebfc85e2cd7 Merge tag 'net-6.0-rc1' of git://git.kernel.o..
git tree:       upstream
kernel config:  https://syzkaller.appspot.com/x/.config?x=20bc0b329895d963
dashboard link: https://syzkaller.appspot.com/bug?extid=10e37d0d88cbc2ea19e4
syz repro:      https://syzkaller.appspot.com/x/repro.syz?x=13537803080000
C reproducer:   https://syzkaller.appspot.com/x/repro.c?x=12e68315080000

If the result looks correct, please mark the issue as fixed by replying with:

#syz fix: Bluetooth: L2CAP: initialize delayed works at l2cap_chan_create()

For information about bisection process see: https://goo.gl/tpsmEJ#bisection