NILFS (loop1): couldn't find nilfs on the device watchdog: BUG: soft lockup - CPU#1 stuck for 23s! [syz-executor.0:14355] Modules linked in: irq event stamp: 10386 hardirqs last enabled at (10385): [] restore_regs_and_return_to_kernel+0x0/0x2a hardirqs last disabled at (10386): [] apic_timer_interrupt+0x8e/0xa0 arch/x86/entry/entry_64.S:793 softirqs last enabled at (6080): [] __do_softirq+0x68b/0x9ff kernel/softirq.c:314 softirqs last disabled at (6049): [] invoke_softirq kernel/softirq.c:368 [inline] softirqs last disabled at (6049): [] irq_exit+0x193/0x240 kernel/softirq.c:409 CPU: 1 PID: 14355 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: ffff888050f9a040 task.stack: ffff888056db8000 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:ffff888056dbfd10 EFLAGS: 00000206 ORIG_RAX: ffffffffffffff10 RAX: 0000000000000101 RBX: ffffffff89dd6668 RCX: 00000000000050e9 RDX: 0000000000000000 RSI: 0000000000000001 RDI: ffffffff89dd6668 RBP: ffffffff89dd666c R08: ffffffff8b9c6208 R09: 00000000000405a1 R10: ffff888050f9a918 R11: ffff888050f9a040 R12: 0000000000000003 R13: fffffbfff13baccd R14: 00000000000000ff R15: ffff888096777cd0 FS: 0000555556e4f400(0000) GS:ffff8880ba500000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00005555567e4708 CR3: 00000000a9334000 CR4: 00000000003406e0 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: 0033:0x7fcbeee6ac2b RSP: 002b:00007ffe9856d6b0 EFLAGS: 00000293 ORIG_RAX: 0000000000000003 RAX: 0000000000000000 RBX: 0000000000000013 RCX: 00007fcbeee6ac2b RDX: 00007fcbeefd0840 RSI: ffffffffffffffff RDI: 0000000000000012 RBP: 00007fcbeefcc960 R08: 0000000000000000 R09: 00007fcbeefd0848 R10: 00007ffe9856d7b0 R11: 0000000000000293 R12: 0000000000030693 R13: 00007ffe9856d7b0 R14: 00007fcbeefcb100 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: 14371 Comm: syz-executor.5 Not tainted 4.14.262-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 task: ffff888055ad00c0 task.stack: ffff888053298000 RIP: 0010:___preempt_schedule_notrace+0x1a/0x34 RSP: 0018:ffff8880ba407fa8 EFLAGS: 00000046 RAX: 0000000000000007 RBX: 0000000000000000 RCX: 0000000000000000 RDX: 0000000000000000 RSI: 0000000000000000 RDI: ffff888055ad090c RBP: ffff8880ba407fe8 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000000 R12: 0000000000000000 R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000000000 FS: 00007f335e0cf700(0000) GS:ffff8880ba400000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 0000001b2fa2a000 CR3: 00000000b4c4b000 CR4: 00000000003406f0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: apic_timer_interrupt+0x8e/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+0x271/0x910 kernel/locking/qspinlock.c:465 RSP: 0018:ffff88805329fb48 EFLAGS: 00000202 ORIG_RAX: ffffffffffffff10 RAX: 0000000000000000 RBX: ffff8880ba434f00 RCX: fffffbfff13baccd RDX: 0000000000007e68 RSI: 0000000000000004 RDI: 0000000000000286 RBP: ffffffff89dd666c R08: 0000000000000001 R09: 0000000000000000 R10: 0000000000000001 R11: 0000000000000000 R12: 0000000000000000 R13: dffffc0000000000 R14: ffffffff89dd666d 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_removed+0x200/0x240 net/bluetooth/mgmt.c:6600 hci_sock_bind+0xe00/0x12b0 net/bluetooth/hci_sock.c:1186 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: 0033:0x7f335f759fe9 RSP: 002b:00007f335e0cf168 EFLAGS: 00000246 ORIG_RAX: 0000000000000031 RAX: ffffffffffffffda RBX: 00007f335f86cf60 RCX: 00007f335f759fe9 RDX: 0000000000000006 RSI: 0000000020000240 RDI: 0000000000000004 RBP: 00007f335f7b408d R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 00007fff73d5741f R14: 00007f335e0cf300 R15: 0000000000022000 Code: 51 50 41 50 41 51 41 52 41 53 e8 96 fe 22 06 eb 18 55 48 89 e5 57 56 52 51 50 41 50 41 51 41 52 41 53 e8 2e ff 22 06 eb 00 41 5b <41> 5a 41 59 41 58 58 59 5a 5e 5f 5d c3 90 90 90 90 90 90 90 90 ---------------- 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