watchdog: BUG: soft lockup - CPU#1 stuck for 22s! [syz-executor.3:11216] Modules linked in: irq event stamp: 9370 hardirqs last enabled at (9369): [] restore_regs_and_return_to_kernel+0x0/0x2a hardirqs last disabled at (9370): [] apic_timer_interrupt+0x8e/0xa0 arch/x86/entry/entry_64.S:793 softirqs last enabled at (5222): [] __do_softirq+0x68b/0x9ff kernel/softirq.c:314 softirqs last disabled at (5059): [] invoke_softirq kernel/softirq.c:368 [inline] softirqs last disabled at (5059): [] irq_exit+0x193/0x240 kernel/softirq.c:409 CPU: 1 PID: 11216 Comm: syz-executor.3 Not tainted 4.14.275-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 task: ffff8880b41cc280 task.stack: ffff8880675a8000 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+0xcb/0x1d0 kernel/locking/qrwlock.c:139 RSP: 0018:ffff8880675afd10 EFLAGS: 00000206 ORIG_RAX: ffffffffffffff10 RAX: 0000000000000101 RBX: ffffffff89ddb028 RCX: 0000000000005584 RDX: 0000000000000000 RSI: 0000000000000001 RDI: ffffffff89ddb028 RBP: ffffffff89ddb02c R08: ffffffff8b9cf6e0 R09: 00000000000405a0 R10: ffff8880b41ccb58 R11: ffff8880b41cc280 R12: 0000000000000003 R13: fffffbfff13bb605 R14: 00000000000000ff R15: ffff88809646fa90 FS: 0000555556863400(0000) GS:ffff8880ba500000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 0000001b2e92d000 CR3: 00000000a1d1f000 CR4: 00000000003426e0 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_unlink+0x1d/0x170 net/bluetooth/af_bluetooth.c:151 hci_sock_release+0xc1/0x4c0 net/bluetooth/hci_sock.c:855 __sock_release+0xcd/0x2b0 net/socket.c:602 sock_close+0x15/0x20 net/socket.c:1139 __fput+0x25f/0x7a0 fs/file_table.c:210 task_work_run+0x11f/0x190 kernel/task_work.c:113 tracehook_notify_resume include/linux/tracehook.h:191 [inline] exit_to_usermode_loop+0x1ad/0x200 arch/x86/entry/common.c:164 prepare_exit_to_usermode arch/x86/entry/common.c:199 [inline] syscall_return_slowpath arch/x86/entry/common.c:270 [inline] do_syscall_64+0x4a3/0x640 arch/x86/entry/common.c:297 entry_SYSCALL_64_after_hwframe+0x46/0xbb RIP: 0033:0x7fa4ea261c8b RSP: 002b:00007ffdf2b54d50 EFLAGS: 00000293 ORIG_RAX: 0000000000000003 RAX: 0000000000000000 RBX: 0000000000000005 RCX: 00007fa4ea261c8b RDX: 00007fa4ea3c7c80 RSI: ffffffffffffffff RDI: 0000000000000004 RBP: 00007fa4ea3c3960 R08: 0000000000000000 R09: 00007fa4ea3c7c88 R10: 00007ffdf2b54e50 R11: 0000000000000293 R12: 0000000000024026 R13: 00007ffdf2b54e50 R14: 00007fa4ea3c1f60 R15: 0000000000000032 Code: 75 dc 49 89 dd 49 89 dc 41 be 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 Sending NMI from CPU 1 to CPUs 0: NMI backtrace for cpu 0 CPU: 0 PID: 11230 Comm: syz-executor.5 Not tainted 4.14.275-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 task: ffff8880b4d46140 task.stack: ffff88806cce8000 RIP: 0010:__read_once_size include/linux/compiler.h:185 [inline] RIP: 0010:debug_spin_lock_before kernel/locking/spinlock_debug.c:84 [inline] RIP: 0010:do_raw_spin_lock+0x68/0x200 kernel/locking/spinlock_debug.c:112 RSP: 0018:ffff8880ba407ef0 EFLAGS: 00000046 RAX: dffffc0000000000 RBX: 0000000000000000 RCX: 00000000000073ba RDX: 1ffff11017485d92 RSI: 0000000000000001 RDI: ffff8880ba42ec84 RBP: ffff8880ba42ec80 R08: ffffffff8b9de890 R09: 00000000000c4051 R10: ffff8880b4d46a40 R11: ffff8880b4d46140 R12: ffff8880ba42ec80 R13: ffff8880ba42ec90 R14: 0000000000000000 R15: 0000000000000000 FS: 00007f8de05f8700(0000) GS:ffff8880ba400000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007fad7fc31470 CR3: 00000000ae000000 CR4: 00000000003426f0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: hrtimer_interrupt+0x100/0x5e0 kernel/time/hrtimer.c:1308 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:trylock_clear_pending kernel/locking/qspinlock_paravirt.h:99 [inline] RIP: 0010:pv_wait_head_or_lock kernel/locking/qspinlock_paravirt.h:412 [inline] RIP: 0010:__pv_queued_spin_lock_slowpath+0x27e/0x910 kernel/locking/qspinlock.c:465 RSP: 0018:ffff88806ccefb68 EFLAGS: 00000246 ORIG_RAX: ffffffffffffff10 RAX: 0000000000000000 RBX: ffff8880ba434f00 RCX: fffffbfff13bb605 RDX: 0000000000006edf RSI: 0000000000000004 RDI: 0000000000000286 RBP: ffffffff89ddb02c R08: 0000000000000001 R09: 0000000000000000 R10: 0000000000000001 R11: 0000000000000000 R12: 0000000000000000 R13: dffffc0000000000 R14: ffffffff89ddb02d R15: ffffed10174869e8 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: 0033:0x7f8de1c83049 RSP: 002b:00007f8de05f8168 EFLAGS: 00000246 ORIG_RAX: 0000000000000031 RAX: ffffffffffffffda RBX: 00007f8de1d95f60 RCX: 00007f8de1c83049 RDX: 0000000000000006 RSI: 0000000020000000 RDI: 0000000000000004 RBP: 00007f8de1cdd08d R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 00007fff06707c6f R14: 00007f8de05f8300 R15: 0000000000022000 Code: 04 3d ad 4e ad de 0f 85 36 01 00 00 4c 8d 6d 10 48 b8 00 00 00 00 00 fc ff df 4c 89 ea 48 c1 ea 03 80 3c 02 00 0f 85 72 01 00 00 <48> 8b 45 10 65 48 8b 14 25 c0 7f 02 00 48 39 c2 0f 84 15 01 00 ---------------- Code disassembly (best guess): 0: 75 dc jne 0xffffffde 2: 49 89 dd mov %rbx,%r13 5: 49 89 dc mov %rbx,%r12 8: 41 be ff 00 00 00 mov $0xff,%r14d e: 49 c1 ed 03 shr $0x3,%r13 12: 41 83 e4 07 and $0x7,%r12d 16: 48 b8 00 00 00 00 00 movabs $0xdffffc0000000000,%rax 1d: fc ff df 20: 49 01 c5 add %rax,%r13 23: 41 83 c4 03 add $0x3,%r12d 27: eb 02 jmp 0x2b 29: f3 90 pause * 2b: 41 0f b6 45 00 movzbl 0x0(%r13),%eax <-- trapping instruction 30: 41 38 c4 cmp %al,%r12b 33: 7c 08 jl 0x3d 35: 84 c0 test %al,%al 37: 0f 85 9e 00 00 00 jne 0xdb 3d: 8b 03 mov (%rbx),%eax 3f: 83 .byte 0x83