WARNING in __queue_work

[syzbot]

Hello,

syzbot found the following issue on:

HEAD commit: 67957f12 Linux 4.19.144
git tree: linux-4.19.y
console output: https://syzkaller.appspot.com/x/log.txt?x=137bd053900000
kernel config: https://syzkaller.appspot.com/x/.config?x=c8f92680d5d45401
dashboard link: https://syzkaller.appspot.com/bug?extid=d2947c1795156c5217b4
compiler: gcc (GCC) 10.1.0-syz 20200507

Unfortunately, I don't have any reproducer for this issue yet.

IMPORTANT: if you fix the issue, please add the following tag to the commit:
Reported-by: syzbot+d2947c...@syzkaller.appspotmail.com

WARNING: CPU: 0 PID: 10463 at kernel/workqueue.c:1384 __queue_work+0xc8d/0x1100 kernel/workqueue.c:1384
Kernel panic - not syncing: panic_on_warn set ...

CPU: 0 PID: 10463 Comm: syz-executor.1 Not tainted 4.19.144-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
Call Trace:
__dump_stack lib/dump_stack.c:77 [inline]
dump_stack+0x1fc/0x2fe lib/dump_stack.c:118
panic+0x26a/0x50e kernel/panic.c:186
__warn.cold+0x20/0x61 kernel/panic.c:541
report_bug+0x262/0x2b0 lib/bug.c:186
fixup_bug arch/x86/kernel/traps.c:178 [inline]
fixup_bug arch/x86/kernel/traps.c:173 [inline]
do_error_trap+0x1d7/0x310 arch/x86/kernel/traps.c:296
invalid_op+0x14/0x20 arch/x86/entry/entry_64.S:1038
RIP: 0010:__queue_work+0xc8d/0x1100 kernel/workqueue.c:1384
Code: 03 38 d0 7c 09 84 d2 74 05 e8 af 9f 5b 00 8b 5b 24 31 ff 83 e3 20 89 de e8 70 78 25 00 85 db 0f 85 c2 00 00 00 e8 f3 76 25 00 <0f> 0b e9 5d f9 ff ff e8 e7 76 25 00 4c 8d 75 60 41 83 cd 02 e9 11
RSP: 0018:ffff88804a527790 EFLAGS: 00010016
RAX: 0000000000040000 RBX: 0000000000000000 RCX: ffffc90007cdf000
RDX: 0000000000011fbc RSI: ffffffff81443add RDI: 0000000000000005
RBP: 0000000000010000 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000005 R11: 0000000000000000 R12: ffff888054326868
R13: ffff88808c5c60c0 R14: 0000000000000000 R15: 0000000000000040
queue_work_on+0x17e/0x1f0 kernel/workqueue.c:1488
l2cap_do_send+0x2d4/0x390 net/bluetooth/l2cap_core.c:912
l2cap_chan_send+0x2512/0x3b90 net/bluetooth/l2cap_core.c:2541
l2cap_sock_sendmsg+0x201/0x2b0 net/bluetooth/l2cap_sock.c:974
sock_sendmsg_nosec net/socket.c:622 [inline]
sock_sendmsg+0xc3/0x120 net/socket.c:632
___sys_sendmsg+0x3b3/0x8e0 net/socket.c:2115
__sys_sendmmsg+0x195/0x470 net/socket.c:2210
__do_sys_sendmmsg net/socket.c:2239 [inline]
__se_sys_sendmmsg net/socket.c:2236 [inline]
__x64_sys_sendmmsg+0x99/0x100 net/socket.c:2236
do_syscall_64+0xf9/0x620 arch/x86/entry/common.c:293
entry_SYSCALL_64_after_hwframe+0x49/0xbe
RIP: 0033:0x45d5b9
Code: 5d b4 fb ff c3 66 2e 0f 1f 84 00 00 00 00 00 66 90 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 0f 83 2b b4 fb ff c3 66 2e 0f 1f 84 00 00 00 00
RSP: 002b:00007f1fabedec78 EFLAGS: 00000246 ORIG_RAX: 0000000000000133
RAX: ffffffffffffffda RBX: 0000000000027a40 RCX: 000000000045d5b9
RDX: 0000000000000500 RSI: 0000000020003f00 RDI: 0000000000000004
RBP: 000000000118cf88 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 000000000118cf4c
R13: 00007ffec780290f R14: 00007f1fabedf9c0 R15: 000000000118cf4c
Kernel Offset: disabled
Rebooting in 86400 seconds..


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[syzbot]

Auto-closing this bug as obsolete.
Crashes did not happen for a while, no reproducer and no activity.