------------[ cut here ]------------
workqueue: cannot queue hci_cmd_timeout on wq hci8
WARNING: kernel/workqueue.c:2251 at __queue_work+0xcbb/0x10f0 kernel/workqueue.c:2250, CPU#1: syz.8.6194/26004
Modules linked in:
CPU: 1 UID: 0 PID: 26004 Comm: syz.8.6194 Tainted: G L syzkaller #0 PREEMPT(full)
Tainted: [L]=SOFTLOCKUP
Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.3-debian-1.16.3-2 04/01/2014
RIP: 0010:__queue_work+0xcbf/0x10f0 kernel/workqueue.c:2250
Code: 00 00 00 fc ff df 49 8d 94 24 78 01 00 00 48 89 f9 48 c1 e9 03 80 3c 01 00 0f 85 15 04 00 00 48 8d 3d 85 2a ec 0e 48 8b 75 18 <67> 48 0f b9 3a e9 77 f7 ff ff e8 d2 92 38 00 90 0f 0b 90 e9 ff f5
RSP: 0018:ffffc900006a0bf0 EFLAGS: 00010046
RAX: dffffc0000000000 RBX: 0000000000000100 RCX: 1ffff11002798151
RDX: ffff88814b534178 RSI: ffffffff8a726700 RDI: ffffffff90badcc0
RBP: ffff888013cc0a70 R08: 0000000000000005 R09: 0000000000000000
R10: 0000000000000100 R11: 0000000000000000 R12: ffff88814b534000
R13: 1ffff920000d418f R14: ffffffff81cec340 R15: 0000000000000001
FS: 000055555d888500(0000) GS:ffff8880d66b3000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f6ad374da08 CR3: 0000000033a0a000 CR4: 0000000000352ef0
DR0: 0000000000000007 DR1: 0000000000000005 DR2: 0000000000000006
DR3: 0000000000007fff DR6: 00000000ffff0ff0 DR7: 0000000000000400
Call Trace:
call_timer_fn+0x19a/0x590 kernel/time/timer.c:1748
expire_timers kernel/time/timer.c:1794 [inline]
__run_timers+0x570/0xac0 kernel/time/timer.c:2373
__run_timer_base kernel/time/timer.c:2385 [inline]
__run_timer_base kernel/time/timer.c:2377 [inline]
run_timer_base+0x114/0x190 kernel/time/timer.c:2394
run_timer_softirq+0x1a/0x50 kernel/time/timer.c:2404
handle_softirqs+0x1ea/0x910 kernel/softirq.c:622
__do_softirq kernel/softirq.c:656 [inline]
invoke_softirq kernel/softirq.c:496 [inline]
__irq_exit_rcu+0xef/0x150 kernel/softirq.c:723
irq_exit_rcu+0x9/0x30 kernel/softirq.c:739
instr_sysvec_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1056 [inline]
sysvec_apic_timer_interrupt+0xa3/0xc0 arch/x86/kernel/apic/apic.c:1056
asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:697
RIP: 0010:lockdep_unregister_key+0x12b/0x1d0 kernel/locking/lockdep.c:6616
Code: e8 da dd ff ff 48 83 2d da 64 23 14 01 89 c3 e8 2b e0 ff ff 9c 58 f6 c4 02 0f 85 8a 00 00 00 f7 c5 00 02 00 00 74 01 fb 84 db <75> 40 5b 5d 41 5c e9 4a 84 09 00 9c 58 f6 c4 02 0f 84 16 ff ff ff
RSP: 0018:ffffc9000daafa60 EFLAGS: 00000246
RAX: 0000000000000046 RBX: 0000000000000000 RCX: 0000000000000001
RDX: 0000000000000000 RSI: ffffffff8dd42eb7 RDI: ffffffff8bfa92a0
RBP: 0000000000000246 R08: 0000000000012c38 R09: ffffffff96090390
R10: 0000000000000200 R11: 0000000000000000 R12: ffffffff976dab88
R13: ffff88802afe8000 R14: ffff88802afe84c8 R15: 0000000000000100
__qdisc_destroy+0x11a/0x490 net/sched/sch_generic.c:1079
qdisc_put+0xb0/0xf0 net/sched/sch_generic.c:1105
shutdown_scheduler_queue+0xa5/0x160 net/sched/sch_generic.c:1158
netdev_for_each_tx_queue include/linux/netdevice.h:2680 [inline]
dev_shutdown+0xb3/0x440 net/sched/sch_generic.c:1490
unregister_netdevice_many_notify+0xd56/0x2580 net/core/dev.c:12384
unregister_netdevice_many net/core/dev.c:12459 [inline]
unregister_netdevice_queue net/core/dev.c:12273 [inline]
unregister_netdevice_queue+0x30b/0x3c0 net/core/dev.c:12263
unregister_netdevice include/linux/netdevice.h:3405 [inline]
__tun_detach+0x1173/0x1480 drivers/net/tun.c:621
tun_detach drivers/net/tun.c:637 [inline]
tun_chr_close+0xc2/0x220 drivers/net/tun.c:3436
__fput+0x3ff/0xb40 fs/file_table.c:469
task_work_run+0x150/0x240 kernel/task_work.c:233
resume_user_mode_work include/linux/resume_user_mode.h:50 [inline]
__exit_to_user_mode_loop kernel/entry/common.c:67 [inline]
exit_to_user_mode_loop+0x100/0x4a0 kernel/entry/common.c:98
__exit_to_user_mode_prepare include/linux/irq-entry-common.h:226 [inline]
syscall_exit_to_user_mode_prepare include/linux/irq-entry-common.h:256 [inline]
syscall_exit_to_user_mode include/linux/entry-common.h:325 [inline]
do_syscall_64+0x67c/0xf80 arch/x86/entry/syscall_64.c:100
entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f1350f9bf79
Code: ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 44 00 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 e8 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007ffc1e1ff038 EFLAGS: 00000246 ORIG_RAX: 00000000000001b4
RAX: 0000000000000000 RBX: 00007ffc1e1ff120 RCX: 00007f1350f9bf79
RDX: 0000000000000000 RSI: 000000000000001e RDI: 0000000000000003
RBP: 00000000000a7202 R08: 0000000000000001 R09: 0000000000000000
R10: 0000001b30a20000 R11: 0000000000000246 R12: 00007ffc1e1ff160
R13: 00007f1351215fac R14: 00000000000a72d0 R15: 00007f1351215fa0
----------------
Code disassembly (best guess):
0: 00 00 add %al,(%rax)
2: 00 fc add %bh,%ah
4: ff lcall (bad)
5: df 49 8d fisttps -0x73(%rcx)
8: 94 xchg %eax,%esp
9: 24 78 and $0x78,%al
b: 01 00 add %eax,(%rax)
d: 00 48 89 add %cl,-0x77(%rax)
10: f9 stc
11: 48 c1 e9 03 shr $0x3,%rcx
15: 80 3c 01 00 cmpb $0x0,(%rcx,%rax,1)
19: 0f 85 15 04 00 00 jne 0x434
1f: 48 8d 3d 85 2a ec 0e lea 0xeec2a85(%rip),%rdi # 0xeec2aab
26: 48 8b 75 18 mov 0x18(%rbp),%rsi
* 2a: 67 48 0f b9 3a ud1 (%edx),%rdi <-- trapping instruction
2f: e9 77 f7 ff ff jmp 0xfffff7ab
34: e8 d2 92 38 00 call 0x38930b
39: 90 nop
3a: 0f 0b ud2
3c: 90 nop
3d: e9 .byte 0xe9
3e: ff f5 push %rbp