watchdog: BUG: soft lockup - CPU#1 stuck for 22s! [syz-executor.1:16635] Modules linked in: irq event stamp: 2869738 hardirqs last enabled at (2869737): [] restore_regs_and_return_to_kernel+0x0/0x2a hardirqs last disabled at (2869738): [] apic_timer_interrupt+0x8e/0xa0 arch/x86/entry/entry_64.S:793 softirqs last enabled at (84436): [] __do_softirq+0x68b/0x9ff kernel/softirq.c:314 softirqs last disabled at (84307): [] invoke_softirq kernel/softirq.c:368 [inline] softirqs last disabled at (84307): [] irq_exit+0x193/0x240 kernel/softirq.c:409 CPU: 1 PID: 16635 Comm: syz-executor.1 Not tainted 4.14.264-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 task: ffff88809e6306c0 task.stack: ffff8880712e0000 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:ffff8880712e7b68 EFLAGS: 00000206 ORIG_RAX: ffffffffffffff10 RAX: 0000000000000003 RBX: ffff8880ba534f00 RCX: fffffbfff13bb4ad RDX: 0000000000002c34 RSI: 0000000000000004 RDI: 0000000000000286 RBP: ffffffff89dda56c R08: 0000000000000001 R09: 0000000000000000 R10: 0000000000000001 R11: 0000000000000000 R12: 0000000000000000 R13: dffffc0000000000 R14: ffffffff89dda56d R15: ffffed10174a69e8 FS: 00007fe663797700(0000) GS:ffff8880ba500000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00005555560bf708 CR3: 000000009d20f000 CR4: 00000000003406e0 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: 0033:0x7fe664e22059 RSP: 002b:00007fe663797168 EFLAGS: 00000246 ORIG_RAX: 0000000000000031 RAX: ffffffffffffffda RBX: 00007fe664f34f60 RCX: 00007fe664e22059 RDX: 0000000000000006 RSI: 0000000020000240 RDI: 0000000000000004 RBP: 00007fe664e7c08d R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 00007ffe3cb7ab7f R14: 00007fe663797300 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 1 to CPUs 0: NMI backtrace for cpu 0 CPU: 0 PID: 16614 Comm: syz-executor.2 Not tainted 4.14.264-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 task: ffff8880b5134600 task.stack: ffff888072d68000 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:ffff888072d6fd10 EFLAGS: 00000206 RAX: 0000000000000101 RBX: ffffffff89dda568 RCX: 00000000000037d8 RDX: 0000000000000000 RSI: 0000000000000001 RDI: ffffffff89dda568 RBP: ffffffff89dda56c R08: ffffffff8b9bd980 R09: 0000000000040599 R10: ffff8880b5134ed8 R11: ffff8880b5134600 R12: 0000000000000003 R13: fffffbfff13bb4ad R14: 00000000000000ff R15: ffff88809b59bd50 FS: 00005555559ee400(0000) GS:ffff8880ba400000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 0000001b31944000 CR3: 00000000b445e000 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_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: 0033:0x7f9e99d72c9b RSP: 002b:00007fffe9489130 EFLAGS: 00000293 ORIG_RAX: 0000000000000003 RAX: 0000000000000000 RBX: 0000000000000005 RCX: 00007f9e99d72c9b RDX: 0000000000000000 RSI: 00007f9e99d37000 RDI: 0000000000000004 RBP: 00007f9e99ed4960 R08: 0000000000000000 R09: 00000000e47ca672 R10: 0000000000000000 R11: 0000000000000293 R12: 000000000002f87d R13: 00007fffe9489230 R14: 00007f9e99ed3030 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 ---------------- 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