watchdog: BUG: soft lockup - CPU#0 stuck for 23s! [syz-executor.2:20178] Modules linked in: irq event stamp: 12106 hardirqs last enabled at (12105): [] kvm_wait arch/x86/kernel/kvm.c:600 [inline] hardirqs last enabled at (12105): [] kvm_wait+0x14b/0x240 arch/x86/kernel/kvm.c:580 hardirqs last disabled at (12106): [] apic_timer_interrupt+0x8e/0xa0 arch/x86/entry/entry_64.S:793 softirqs last enabled at (2050): [] __do_softirq+0x68b/0x9ff kernel/softirq.c:314 softirqs last disabled at (1951): [] invoke_softirq kernel/softirq.c:368 [inline] softirqs last disabled at (1951): [] irq_exit+0x193/0x240 kernel/softirq.c:409 CPU: 0 PID: 20178 Comm: syz-executor.2 Not tainted 4.14.277-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 task: ffff888095064680 task.stack: ffff88809b8a8000 RIP: 0010:native_safe_halt+0xe/0x10 arch/x86/include/asm/irqflags.h:61 RSP: 0018:ffff88809b8afb20 EFLAGS: 00000282 ORIG_RAX: ffffffffffffff10 RAX: 1ffffffff11e1314 RBX: ffffffff89ddb5ac RCX: 1ffff11012a0c9ef RDX: dffffc0000000000 RSI: ffff888095064f58 RDI: ffff888095064f04 RBP: 0000000000000003 R08: 0000000000000001 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000000 R12: 0000000000000286 R13: dffffc0000000000 R14: ffffffff89ddb5ad R15: ffffed10174869e8 FS: 00007fd0c35ce700(0000) GS:ffff8880ba400000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 0000000000000000 CR3: 00000000a9773000 CR4: 00000000003406f0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: arch_safe_halt arch/x86/include/asm/paravirt.h:94 [inline] kvm_wait arch/x86/kernel/kvm.c:600 [inline] kvm_wait+0x179/0x240 arch/x86/kernel/kvm.c:580 pv_wait arch/x86/include/asm/paravirt.h:679 [inline] pv_wait_head_or_lock kernel/locking/qspinlock_paravirt.h:447 [inline] __pv_queued_spin_lock_slowpath+0x722/0x910 kernel/locking/qspinlock.c:465 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: 0033:0x7fd0c4c590e9 RSP: 002b:00007fd0c35ce168 EFLAGS: 00000246 ORIG_RAX: 0000000000000031 RAX: ffffffffffffffda RBX: 00007fd0c4d6bf60 RCX: 00007fd0c4c590e9 RDX: 0000000000000006 RSI: 0000000020000040 RDI: 0000000000000004 RBP: 00007fd0c4cb308d R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 00007ffe2ba7ca1f R14: 00007fd0c35ce300 R15: 0000000000022000 Code: 8b 5a fa e9 4f ff ff ff 48 89 ef e8 4d 8b 5a fa eb 93 90 90 90 90 90 90 90 90 90 90 90 e9 07 00 00 00 0f 00 2d b4 19 63 00 fb f4 90 e9 07 00 00 00 0f 00 2d a4 19 63 00 f4 c3 90 90 41 55 41 Sending NMI from CPU 0 to CPUs 1: NMI backtrace for cpu 1 CPU: 1 PID: 20170 Comm: syz-executor.0 Not tainted 4.14.277-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 task: ffff8880ac2ca640 task.stack: ffff888093c40000 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:ffff888093c47950 EFLAGS: 00000206 RAX: 0000000000000101 RBX: ffffffff89ddb5a8 RCX: 00000000000005f7 RDX: 0000000000000000 RSI: 0000000000000001 RDI: ffffffff89ddb5a8 RBP: ffffffff89ddb5ac R08: ffffffff8b9a8a78 R09: 0000000000040590 R10: ffff8880ac2caf18 R11: ffff8880ac2ca640 R12: 0000000000000003 R13: fffffbfff13bb6b5 R14: 00000000000000ff R15: ffff8880a7c4dc90 FS: 0000000000000000(0000) GS:ffff8880ba500000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007f66aacc3f64 CR3: 0000000008e6a000 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 exit_task_work include/linux/task_work.h:22 [inline] do_exit+0xa44/0x2850 kernel/exit.c:868 do_group_exit+0x100/0x2e0 kernel/exit.c:965 get_signal+0x38d/0x1ca0 kernel/signal.c:2412 do_signal+0x7c/0x1550 arch/x86/kernel/signal.c:792 exit_to_usermode_loop+0x160/0x200 arch/x86/entry/common.c:160 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: 0033:0x7ff7eed620e9 RSP: 002b:00007ff7ed632218 EFLAGS: 00000246 ORIG_RAX: 00000000000000ca RAX: fffffffffffffe00 RBX: 00007ff7eee75378 RCX: 00007ff7eed620e9 RDX: 0000000000000000 RSI: 0000000000000080 RDI: 00007ff7eee75378 RBP: 00007ff7eee75370 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 00007ff7eee7537c R13: 00007ffcada76a5f R14: 00007ff7ed632300 R15: 0000000000022000 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: 8b 5a fa mov -0x6(%rdx),%ebx 3: e9 4f ff ff ff jmpq 0xffffff57 8: 48 89 ef mov %rbp,%rdi b: e8 4d 8b 5a fa callq 0xfa5a8b5d 10: eb 93 jmp 0xffffffa5 12: 90 nop 13: 90 nop 14: 90 nop 15: 90 nop 16: 90 nop 17: 90 nop 18: 90 nop 19: 90 nop 1a: 90 nop 1b: 90 nop 1c: 90 nop 1d: e9 07 00 00 00 jmpq 0x29 22: 0f 00 2d b4 19 63 00 verw 0x6319b4(%rip) # 0x6319dd 29: fb sti 2a: f4 hlt * 2b: c3 retq <-- trapping instruction 2c: 90 nop 2d: e9 07 00 00 00 jmpq 0x39 32: 0f 00 2d a4 19 63 00 verw 0x6319a4(%rip) # 0x6319dd 39: f4 hlt 3a: c3 retq 3b: 90 nop 3c: 90 nop 3d: 41 55 push %r13 3f: 41 rex.B