WARNING in __queue_work (3)

[syzbot]

Hello,

syzbot found the following issue on:

HEAD commit: e2c46b57 Merge tag 'block-5.8-2020-07-30' of git://git.ker..
git tree: upstream
console output: https://syzkaller.appspot.com/x/log.txt?x=1269bcb8900000
kernel config: https://syzkaller.appspot.com/x/.config?x=e956cd46a325a50c
dashboard link: https://syzkaller.appspot.com/bug?extid=63bed493aebbf6872647
compiler: gcc (GCC) 10.1.0-syz 20200507
userspace arch: i386

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+63bed4...@syzkaller.appspotmail.com

------------[ cut here ]------------
WARNING: CPU: 1 PID: 0 at kernel/workqueue.c:1413 __queue_work+0xc2c/0xff0 kernel/workqueue.c:1413
Kernel panic - not syncing: panic_on_warn set ...
CPU: 1 PID: 0 Comm: swapper/1 Not tainted 5.8.0-rc7-syzkaller #0
Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS rel-1.12.0-59-gc9ba5276e321-prebuilt.qemu.org 04/01/2014
Call Trace:
<IRQ>
__dump_stack lib/dump_stack.c:77 [inline]
dump_stack+0x18f/0x20d lib/dump_stack.c:118
panic+0x2e3/0x75c kernel/panic.c:231
__warn.cold+0x20/0x45 kernel/panic.c:600
report_bug+0x1bd/0x210 lib/bug.c:198
handle_bug+0x38/0x90 arch/x86/kernel/traps.c:235
exc_invalid_op+0x13/0x40 arch/x86/kernel/traps.c:255
asm_exc_invalid_op+0x12/0x20 arch/x86/include/asm/idtentry.h:540
RIP: 0010:__queue_work+0xc2c/0xff0 kernel/workqueue.c:1413
Code: e0 07 83 c0 03 38 d0 7c 09 84 d2 74 05 e8 ec 38 67 00 8b 5b 24 31 ff 83 e3 20 89 de e8 8d d0 27 00 85 db 75 7c e8 04 d4 27 00 <0f> 0b e9 42 fa ff ff e8 f8 d3 27 00 0f 0b e9 bb f9 ff ff e8 ec d3
RSP: 0018:ffffc900004e8cb0 EFLAGS: 00010046
RAX: 0000000000000000 RBX: 0000000000000100 RCX: ffffffff814be8b3
RDX: ffff88802c1ec380 RSI: ffffffff814be90c RDI: 0000000000000005
RBP: 0000000000000101 R08: 0000000000000001 R09: ffffffff8cb6a4a3
R10: 0000000000000000 R11: 0000000000000000 R12: ffff88805fdfe128
R13: 0000000000000000 R14: ffff88802930e000 R15: 0000000000000040
call_timer_fn+0x1ac/0x760 kernel/time/timer.c:1416
expire_timers kernel/time/timer.c:1456 [inline]
__run_timers.part.0+0x376/0xa20 kernel/time/timer.c:1792
__run_timers kernel/time/timer.c:1764 [inline]
run_timer_softirq+0xae/0x1a0 kernel/time/timer.c:1805
__do_softirq+0x34c/0xa60 kernel/softirq.c:292
asm_call_on_stack+0xf/0x20 arch/x86/entry/entry_64.S:711
</IRQ>
__run_on_irqstack arch/x86/include/asm/irq_stack.h:22 [inline]
run_on_irqstack_cond arch/x86/include/asm/irq_stack.h:48 [inline]
do_softirq_own_stack+0x111/0x170 arch/x86/kernel/irq_64.c:77
invoke_softirq kernel/softirq.c:387 [inline]
__irq_exit_rcu kernel/softirq.c:417 [inline]
irq_exit_rcu+0x229/0x270 kernel/softirq.c:429
sysvec_apic_timer_interrupt+0x54/0x120 arch/x86/kernel/apic/apic.c:1091
asm_sysvec_apic_timer_interrupt+0x12/0x20 arch/x86/include/asm/idtentry.h:585
RIP: 0010:native_safe_halt+0xe/0x10 arch/x86/include/asm/irqflags.h:61
Code: ff 4c 89 ef e8 e3 69 c8 f9 e9 8e fe ff ff 48 89 df e8 d6 69 c8 f9 eb 8a cc cc cc cc e9 07 00 00 00 0f 00 2d b4 ff 5d 00 fb f4 <c3> 90 e9 07 00 00 00 0f 00 2d a4 ff 5d 00 f4 c3 cc cc 55 53 e8 a9
RSP: 0018:ffffc9000041fde8 EFLAGS: 00000282
RAX: 1ffffffff1369c14 RBX: ffff88802c1ec380 RCX: 0000000000000000
RDX: dffffc0000000000 RSI: 0000000000000000 RDI: ffffffff87eab336
RBP: dffffc0000000000 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000001 R11: 0000000000000000 R12: ffffed100583d870
R13: 0000000000000001 R14: ffffffff8aaf2548 R15: 0000000000000000
arch_safe_halt arch/x86/include/asm/paravirt.h:150 [inline]
default_idle+0x40/0x70 arch/x86/kernel/process.c:686
cpuidle_idle_call kernel/sched/idle.c:163 [inline]
do_idle+0x38f/0x6d0 kernel/sched/idle.c:276
cpu_startup_entry+0x14/0x20 kernel/sched/idle.c:372
start_secondary+0x2b3/0x370 arch/x86/kernel/smpboot.c:268
secondary_startup_64+0xa4/0xb0 arch/x86/kernel/head_64.S:243
Kernel Offset: disabled
Rebooting in 86400 seconds..


---
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 syzk...@googlegroups.com.

syzbot will keep track of this issue. See:
https://goo.gl/tpsmEJ#status for how to communicate with syzbot.

[syzbot]

syzbot has found a reproducer for the following issue on:

HEAD commit: 7d8761ba Merge branch 'fixes' of git://git.kernel.org/pub/..
git tree: upstream
console output: https://syzkaller.appspot.com/x/log.txt?x=14859745500000
kernel config: https://syzkaller.appspot.com/x/.config?x=59df2a4dced5f928

dashboard link: https://syzkaller.appspot.com/bug?extid=63bed493aebbf6872647
compiler: gcc (GCC) 10.1.0-syz 20200507

syz repro: https://syzkaller.appspot.com/x/repro.syz?x=1431cc13500000

IMPORTANT: if you fix the issue, please add the following tag to the commit:
Reported-by: syzbot+63bed4...@syzkaller.appspotmail.com

------------[ cut here ]------------

WARNING: CPU: 1 PID: 24939 at kernel/workqueue.c:1416 __queue_work+0xb59/0xf00 kernel/workqueue.c:1416
Modules linked in:
CPU: 1 PID: 24939 Comm: syz-executor.3 Not tainted 5.10.0-rc7-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
RIP: 0010:__queue_work+0xb59/0xf00 kernel/workqueue.c:1416
Code: e0 07 83 c0 03 38 d0 7c 09 84 d2 74 05 e8 3f d0 69 00 8b 5b 24 31 ff 83 e3 20 89 de e8 20 4b 28 00 85 db 75 7c e8 c7 52 28 00 <0f> 0b e9 dc fa ff ff e8 bb 52 28 00 0f 0b e9 55 fa ff ff e8 af 52
RSP: 0018:ffffc9000266f750 EFLAGS: 00010093
RAX: 0000000000000000 RBX: 0000000000000000 RCX: ffffffff8147b1a0
RDX: ffff88801f184ec0 RSI: ffffffff8147b1a9 RDI: 0000000000000005
RBP: ffff88804d3d4b00 R08: 0000000000000000 R09: ffffffff8f12d1a3
R10: 0000000000000000 R11: 0000000000000000 R12: ffff888059ce4ac8
R13: ffff88803f6b5800 R14: 0000000000000293 R15: ffff88803f6b5800
FS: 00007f4e91751700(0000) GS:ffff8880b9f00000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007effff766db8 CR3: 0000000059bc0000 CR4: 0000000000350ee0
Call Trace:
queue_work_on+0xc7/0xd0 kernel/workqueue.c:1521
l2cap_do_send+0x248/0x480 net/bluetooth/l2cap_core.c:987
l2cap_chan_send+0xcc3/0x2ac0 net/bluetooth/l2cap_core.c:2706
l2cap_sock_sendmsg+0x235/0x2f0 net/bluetooth/l2cap_sock.c:1134
sock_sendmsg_nosec net/socket.c:651 [inline]
sock_sendmsg+0xcf/0x120 net/socket.c:671
____sys_sendmsg+0x331/0x810 net/socket.c:2353
___sys_sendmsg+0xf3/0x170 net/socket.c:2407
__sys_sendmmsg+0x195/0x470 net/socket.c:2497
__do_sys_sendmmsg net/socket.c:2526 [inline]
__se_sys_sendmmsg net/socket.c:2523 [inline]
__x64_sys_sendmmsg+0x99/0x100 net/socket.c:2523
do_syscall_64+0x2d/0x70 arch/x86/entry/common.c:46
entry_SYSCALL_64_after_hwframe+0x44/0xa9
RIP: 0033:0x45e0f9
Code: 0d 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 db b3 fb ff c3 66 2e 0f 1f 84 00 00 00 00
RSP: 002b:00007f4e91750c68 EFLAGS: 00000246 ORIG_RAX: 0000000000000133
RAX: ffffffffffffffda RBX: 0000000000000004 RCX: 000000000045e0f9
RDX: 0000000000000500 RSI: 0000000020003f00 RDI: 0000000000000005
RBP: 000000000119c070 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 000000000119c034
R13: 00007ffd9c18ecaf R14: 00007f4e917519c0 R15: 000000000119c034