watchdog: BUG: soft lockup - CPU#0 stuck for 22s! [syz-executor.3:11835] Modules linked in: irq event stamp: 2959806 hardirqs last enabled at (2959805): [] restore_regs_and_return_to_kernel+0x0/0x2a hardirqs last disabled at (2959806): [] apic_timer_interrupt+0x8e/0xa0 arch/x86/entry/entry_64.S:793 softirqs last enabled at (2256902): [] __do_softirq+0x68b/0x9ff kernel/softirq.c:314 softirqs last disabled at (2256843): [] invoke_softirq kernel/softirq.c:368 [inline] softirqs last disabled at (2256843): [] irq_exit+0x193/0x240 kernel/softirq.c:409 CPU: 0 PID: 11835 Comm: syz-executor.3 Not tainted 4.14.262-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 task: ffff8880989061c0 task.stack: ffff8880a2548000 RIP: 0010:pv_wait_head_or_lock kernel/locking/qspinlock_paravirt.h:411 [inline] RIP: 0010:__pv_queued_spin_lock_slowpath+0x265/0x910 kernel/locking/qspinlock.c:465 RSP: 0018:ffff8880a254fb68 EFLAGS: 00000206 ORIG_RAX: ffffffffffffff10 RAX: 0000000000000003 RBX: ffff8880ba434f00 RCX: fffffbfff13baccd RDX: 0000000000005b7c RSI: 0000000000000004 RDI: 0000000000000286 RBP: ffffffff89dd666c R08: 0000000000000001 R09: 0000000000000000 R10: 0000000000000001 R11: 0000000000000000 R12: 0000000000000000 R13: dffffc0000000000 R14: ffffffff89dd666d R15: ffffed10174869e8 FS: 00007feba068d700(0000) GS:ffff8880ba400000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 0000001b2dd34000 CR3: 00000000b4acc000 CR4: 00000000003406f0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: pv_queued_spin_lock_slowpath arch/x86/include/asm/paravirt.h:669 [inline] queued_spin_lock_slowpath arch/x86/include/asm/qspinlock.h:52 [inline] queued_spin_lock include/asm-generic/qspinlock.h:90 [inline] queued_read_lock_slowpath+0x150/0x190 kernel/locking/qrwlock.c:90 hci_send_to_channel+0x3c/0x200 net/bluetooth/hci_sock.c:272 hci_send_monitor_ctrl_event+0x3dd/0x500 net/bluetooth/hci_sock.c:402 mgmt_send_event+0x2b3/0x330 net/bluetooth/mgmt_util.c:86 mgmt_index_event net/bluetooth/mgmt.c:256 [inline] mgmt_index_added+0x1d5/0x210 net/bluetooth/mgmt.c:6565 hci_sock_bind+0x10a5/0x12b0 net/bluetooth/hci_sock.c:1201 SYSC_bind net/socket.c:1489 [inline] SyS_bind+0x174/0x1f0 net/socket.c:1475 do_syscall_64+0x1d5/0x640 arch/x86/entry/common.c:292 entry_SYSCALL_64_after_hwframe+0x46/0xbb RIP: 0033:0x7feba1d17fe9 RSP: 002b:00007feba068d168 EFLAGS: 00000246 ORIG_RAX: 0000000000000031 RAX: ffffffffffffffda RBX: 00007feba1e2af60 RCX: 00007feba1d17fe9 RDX: 0000000000000006 RSI: 0000000020000240 RDI: 0000000000000004 RBP: 00007feba1d7208d R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 00007fffaa2ee50f R14: 00007feba068d300 R15: 0000000000022000 Code: 84 c0 0f 85 2e 04 00 00 48 89 e9 48 89 ee c6 45 01 01 ba 00 80 00 00 48 c1 e9 03 83 e6 07 41 b8 01 00 00 00 4c 01 e9 eb 0b f3 90 <83> ea 01 0f 84 42 04 00 00 0f b6 01 40 38 f0 7f 08 84 c0 0f 85 Sending NMI from CPU 0 to CPUs 1: NMI backtrace for cpu 1 CPU: 1 PID: 11837 Comm: syz-executor.0 Not tainted 4.14.262-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 task: ffff88809b1a42c0 task.stack: ffff8880984d8000 RIP: 0010:match_held_lock kernel/locking/lockdep.c:3562 [inline] RIP: 0010:__lock_is_held+0x94/0x160 kernel/locking/lockdep.c:3818 RSP: 0018:ffff8880ba507dd8 EFLAGS: 00000046 RAX: 0000000000000003 RBX: ffff88809b1a4b48 RCX: 0000000000000000 RDX: 0000000000000000 RSI: 00000000ffffffff RDI: ffff88809b1a4b6a RBP: 0000000000000000 R08: ffffffff8b9d0270 R09: 0000000000000003 R10: 0000000000000000 R11: ffff88809b1a42c0 R12: ffff88809b1a4b48 R13: dffffc0000000000 R14: ffffffff88f77900 R15: ffff88809b1a42c0 FS: 00007f80eacac700(0000) GS:ffff8880ba500000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 0000000000000000 CR3: 0000000099202000 CR4: 00000000003406e0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: lock_is_held_type+0x10d/0x210 kernel/locking/lockdep.c:4036 lock_is_held include/linux/lockdep.h:437 [inline] rcu_read_lock_sched_held+0x16c/0x1d0 kernel/rcu/update.c:116 trace_hrtimer_cancel include/trace/events/timer.h:278 [inline] debug_deactivate kernel/time/hrtimer.c:454 [inline] __run_hrtimer kernel/time/hrtimer.c:1193 [inline] __hrtimer_run_queues+0x945/0xc80 kernel/time/hrtimer.c:1287 hrtimer_interrupt+0x1e6/0x5e0 kernel/time/hrtimer.c:1321 local_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1079 [inline] smp_apic_timer_interrupt+0x117/0x5e0 arch/x86/kernel/apic/apic.c:1104 apic_timer_interrupt+0x93/0xa0 arch/x86/entry/entry_64.S:793 RIP: 0010:__read_once_size include/linux/compiler.h:185 [inline] RIP: 0010:atomic_read arch/x86/include/asm/atomic.h:27 [inline] RIP: 0010:queued_write_lock_slowpath+0xd0/0x1d0 kernel/locking/qrwlock.c:139 RSP: 0018:ffff8880984dfd38 EFLAGS: 00000206 ORIG_RAX: ffffffffffffff10 RAX: 0000000000000000 RBX: ffffffff89dd6668 RCX: 00000000000048e5 RDX: 0000000000000000 RSI: 0000000000000001 RDI: ffffffff89dd6668 RBP: ffffffff89dd666c R08: ffffffff8b9c21e8 R09: 000000000004059c R10: ffff88809b1a4b70 R11: ffff88809b1a42c0 R12: 0000000000000003 R13: fffffbfff13baccd R14: 00000000000000ff R15: ffffffff8863c1e0 queued_write_lock include/asm-generic/qrwlock.h:134 [inline] do_raw_write_lock+0xc2/0x1d0 kernel/locking/spinlock_debug.c:203 bt_sock_link+0x1f/0x120 net/bluetooth/af_bluetooth.c:143 hci_sock_create+0x15c/0x1d0 net/bluetooth/hci_sock.c:2034 bt_sock_create+0x13b/0x280 net/bluetooth/af_bluetooth.c:130 __sock_create+0x303/0x620 net/socket.c:1275 sock_create net/socket.c:1315 [inline] SYSC_socket net/socket.c:1345 [inline] SyS_socket+0xd1/0x1b0 net/socket.c:1325 do_syscall_64+0x1d5/0x640 arch/x86/entry/common.c:292 entry_SYSCALL_64_after_hwframe+0x46/0xbb RIP: 0033:0x7f80ec336fe9 RSP: 002b:00007f80eacac108 EFLAGS: 00000246 ORIG_RAX: 0000000000000029 RAX: ffffffffffffffda RBX: 00007f80ec449f60 RCX: 00007f80ec336fe9 RDX: 0000000000000001 RSI: 0000000000000003 RDI: 000000000000001f RBP: 0000000000000005 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 00007fff4c19f48f R14: 00007f80eacac300 R15: 0000000000022000 Code: 48 8d 7b 22 48 89 f8 48 c1 e8 03 42 0f b6 14 28 48 89 f8 83 e0 07 83 c0 01 38 d0 7c 08 84 d2 0f 85 b5 00 00 00 66 f7 43 22 f0 ff <74> 0f 4c 89 f6 48 89 df e8 5f f2 ff ff 85 c0 75 2f 83 c5 01 41 ---------------- Code disassembly (best guess): 0: 84 c0 test %al,%al 2: 0f 85 2e 04 00 00 jne 0x436 8: 48 89 e9 mov %rbp,%rcx b: 48 89 ee mov %rbp,%rsi e: c6 45 01 01 movb $0x1,0x1(%rbp) 12: ba 00 80 00 00 mov $0x8000,%edx 17: 48 c1 e9 03 shr $0x3,%rcx 1b: 83 e6 07 and $0x7,%esi 1e: 41 b8 01 00 00 00 mov $0x1,%r8d 24: 4c 01 e9 add %r13,%rcx 27: eb 0b jmp 0x34 29: f3 90 pause * 2b: 83 ea 01 sub $0x1,%edx <-- trapping instruction 2e: 0f 84 42 04 00 00 je 0x476 34: 0f b6 01 movzbl (%rcx),%eax 37: 40 38 f0 cmp %sil,%al 3a: 7f 08 jg 0x44 3c: 84 c0 test %al,%al 3e: 0f .byte 0xf 3f: 85 .byte 0x85