watchdog: BUG: soft lockup - CPU#0 stuck for 23s! [syz-executor.2:12762] Modules linked in: irq event stamp: 5494 hardirqs last enabled at (5493): [] restore_regs_and_return_to_kernel+0x0/0x2a hardirqs last disabled at (5494): [] apic_timer_interrupt+0x8e/0xa0 arch/x86/entry/entry_64.S:793 softirqs last enabled at (320): [] __do_softirq+0x68b/0x9ff kernel/softirq.c:314 softirqs last disabled at (285): [] invoke_softirq kernel/softirq.c:368 [inline] softirqs last disabled at (285): [] irq_exit+0x193/0x240 kernel/softirq.c:409 CPU: 0 PID: 12762 Comm: syz-executor.2 Not tainted 4.14.268-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 task: ffff8880a0208580 task.stack: ffff8880509b8000 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+0xd5/0x1d0 kernel/locking/qrwlock.c:139 RSP: 0018:ffff8880509bfd38 EFLAGS: 00000206 ORIG_RAX: ffffffffffffff10 RAX: 0000000000000000 RBX: ffffffff89dda928 RCX: 0000000000005275 RDX: 0000000000000000 RSI: 0000000000000001 RDI: ffffffff89dda928 RBP: ffffffff89dda92c R08: ffffffff8b9cbe68 R09: 00000000000405a0 R10: ffff8880a0208e30 R11: ffff8880a0208580 R12: 0000000000000003 R13: fffffbfff13bb525 R14: 00000000000000ff R15: ffffffff8863cbc0 FS: 00007f145177d700(0000) GS:ffff8880ba400000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007f1452f1b028 CR3: 00000000aa33a000 CR4: 00000000003406f0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: 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: 0033:0x7f1452e08049 RSP: 002b:00007f145177d108 EFLAGS: 00000246 ORIG_RAX: 0000000000000029 RAX: ffffffffffffffda RBX: 00007f1452f1af60 RCX: 00007f1452e08049 RDX: 0000000000000001 RSI: 0000000000000003 RDI: 000000000000001f RBP: 0000000000000003 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 00007ffd63fafa3f R14: 00007f145177d300 R15: 0000000000022000 Code: ff 00 00 00 49 c1 ed 03 41 83 e4 07 48 b8 00 00 00 00 00 fc ff df 49 01 c5 41 83 c4 03 eb 02 f3 90 41 0f b6 45 00 41 38 c4 7c 08 <84> c0 0f 85 9e 00 00 00 8b 03 83 f8 01 75 e5 f0 44 0f b1 33 83 Sending NMI from CPU 0 to CPUs 1: NMI backtrace for cpu 1 CPU: 1 PID: 12766 Comm: syz-executor.4 Not tainted 4.14.268-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 task: ffff8880998ea400 task.stack: ffff88804fb00000 RIP: 0010:timerqueue_add+0xc5/0x250 lib/timerqueue.c:49 RSP: 0018:ffff8880ba507de8 EFLAGS: 00000046 RAX: ffff8880998ea400 RBX: ffff8880ba52f480 RCX: 0000000000000000 RDX: 1ffff110174a5e92 RSI: ffff8880ab980788 RDI: ffff8880ba52f498 RBP: dffffc0000000000 R08: ffffffff8c06e5c8 R09: 0000000000000004 R10: 0000000000000000 R11: ffff8880998ea400 R12: ffff8880ab980788 R13: 00000039d076b952 R14: 0000000000000001 R15: ffff8880ba52f490 FS: 00007ff8c6d8e700(0000) GS:ffff8880ba500000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 0000000000000000 CR3: 000000009767e000 CR4: 00000000003406e0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: enqueue_hrtimer+0x119/0x3b0 kernel/time/hrtimer.c:851 __run_hrtimer kernel/time/hrtimer.c:1238 [inline] __hrtimer_run_queues+0x8e2/0xc80 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: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:ffff88804fb07b68 EFLAGS: 00000206 ORIG_RAX: ffffffffffffff10 RAX: 0000000000000003 RBX: ffff8880ba534f00 RCX: fffffbfff13bb525 RDX: 000000000000402d RSI: 0000000000000004 RDI: 0000000000000286 RBP: ffffffff89dda92c R08: 0000000000000001 R09: 0000000000000000 R10: 0000000000000001 R11: 0000000000000000 R12: 0000000000000000 R13: dffffc0000000000 R14: ffffffff89dda92d R15: ffffed10174a69e8 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: 0033:0x7ff8c8419049 RSP: 002b:00007ff8c6d8e168 EFLAGS: 00000246 ORIG_RAX: 0000000000000031 RAX: ffffffffffffffda RBX: 00007ff8c852bf60 RCX: 00007ff8c8419049 RDX: 0000000000000006 RSI: 0000000020000240 RDI: 0000000000000004 RBP: 00007ff8c847308d R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 00007ffd3a9ef0af R14: 00007ff8c6d8e300 R15: 0000000000022000 Code: 41 be 01 00 00 00 48 bd 00 00 00 00 00 fc ff df eb 2a e8 af bb 55 fa 4c 8d 7b 10 e8 a6 bb 55 fa 4c 89 fa 48 c1 ea 03 80 3c 2a 00 <0f> 85 1a 01 00 00 49 8b 17 48 85 d2 74 31 48 89 d3 e8 85 bb 55 ---------------- Code disassembly (best guess): 0: ff 00 incl (%rax) 2: 00 00 add %al,(%rax) 4: 49 c1 ed 03 shr $0x3,%r13 8: 41 83 e4 07 and $0x7,%r12d c: 48 b8 00 00 00 00 00 movabs $0xdffffc0000000000,%rax 13: fc ff df 16: 49 01 c5 add %rax,%r13 19: 41 83 c4 03 add $0x3,%r12d 1d: eb 02 jmp 0x21 1f: f3 90 pause 21: 41 0f b6 45 00 movzbl 0x0(%r13),%eax 26: 41 38 c4 cmp %al,%r12b 29: 7c 08 jl 0x33 * 2b: 84 c0 test %al,%al <-- trapping instruction 2d: 0f 85 9e 00 00 00 jne 0xd1 33: 8b 03 mov (%rbx),%eax 35: 83 f8 01 cmp $0x1,%eax 38: 75 e5 jne 0x1f 3a: f0 44 0f b1 33 lock cmpxchg %r14d,(%rbx) 3f: 83 .byte 0x83