watchdog: BUG: soft lockup - CPU#0 stuck for 22s! [syz-executor.1:15937] Modules linked in: irq event stamp: 14740 hardirqs last enabled at (14739): [] restore_regs_and_return_to_kernel+0x0/0x2a hardirqs last disabled at (14740): [] apic_timer_interrupt+0x8e/0xa0 arch/x86/entry/entry_64.S:793 softirqs last enabled at (10896): [] __do_softirq+0x68b/0x9ff kernel/softirq.c:314 softirqs last disabled at (10753): [] invoke_softirq kernel/softirq.c:368 [inline] softirqs last disabled at (10753): [] irq_exit+0x193/0x240 kernel/softirq.c:409 CPU: 0 PID: 15937 Comm: syz-executor.1 Not tainted 4.14.257-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 task: ffff88809f6f8680 task.stack: ffff888091650000 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+0xd0/0x1d0 kernel/locking/qrwlock.c:139 RSP: 0018:ffff888091657d10 EFLAGS: 00000206 ORIG_RAX: ffffffffffffff10 RAX: 0000000000000000 RBX: ffffffff89dd64a8 RCX: 0000000000004323 RDX: 0000000000000000 RSI: 0000000000000001 RDI: ffffffff89dd64a8 RBP: ffffffff89dd64ac R08: ffffffff8b9bf3d8 R09: 0000000000040592 R10: ffff88809f6f8f58 R11: ffff88809f6f8680 R12: 0000000000000003 R13: fffffbfff13bac95 R14: 00000000000000ff R15: ffff88809f774a90 FS: 000055555642d400(0000) GS:ffff8880ba400000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 0000001b2f62e000 CR3: 000000009ff12000 CR4: 00000000003426f0 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: 0033:0x7f37ddb42adb RSP: 002b:00007fff76032500 EFLAGS: 00000293 ORIG_RAX: 0000000000000003 RAX: 0000000000000000 RBX: 0000000000000007 RCX: 00007f37ddb42adb RDX: 00007f37ddcab430 RSI: ffffffffffffffff RDI: 0000000000000006 RBP: 00007f37ddca4960 R08: 0000000000000000 R09: 00007f37ddcab438 R10: 00007fff76032600 R11: 0000000000000293 R12: 0000000000027dfb R13: 00007fff76032600 R14: 00007f37ddca2f60 R15: 0000000000000032 Code: 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 f8 01 75 e5 f0 Sending NMI from CPU 0 to CPUs 1: NMI backtrace for cpu 1 CPU: 1 PID: 15939 Comm: syz-executor.5 Not tainted 4.14.257-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 task: ffff888099f4c680 task.stack: ffff888074df8000 RIP: 0010:native_apic_mem_write+0x8/0x10 arch/x86/include/asm/apic.h:100 RSP: 0018:ffff8880ba507eb8 EFLAGS: 00000046 RAX: dffffc0000000000 RBX: ffffffff88cc7000 RCX: 0000000000000020 RDX: 1ffffffff1198e1d RSI: 000000000000013b RDI: 0000000000000380 RBP: ffff8880ba5282c0 R08: ffff88823fff7058 R09: ffff88823fff704f R10: ffff88823fff7057 R11: 0000002d23a27bb7 R12: 000000000000013b R13: 0000000000000003 R14: 0000002afb0cf9e4 R15: 00000030331f6630 FS: 00007f86ae9d1700(0000) GS:ffff8880ba500000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 0000001b2f42c000 CR3: 000000007ad2f000 CR4: 00000000003426e0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: apic_write arch/x86/include/asm/apic.h:385 [inline] lapic_next_event+0x53/0x80 arch/x86/kernel/apic/apic.c:468 clockevents_program_event+0x1f1/0x2d0 kernel/time/clockevents.c:339 tick_program_event+0x78/0xd0 kernel/time/tick-oneshot.c:47 hrtimer_interrupt+0x336/0x5e0 kernel/time/hrtimer.c:1334 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:ffff888074dffb68 EFLAGS: 00000206 ORIG_RAX: ffffffffffffff10 RAX: 0000000000000003 RBX: ffff8880ba534f00 RCX: fffffbfff13bac95 RDX: 0000000000006571 RSI: 0000000000000004 RDI: 0000000000000286 RBP: ffffffff89dd64ac R08: 0000000000000001 R09: 0000000000000000 R10: 0000000000000001 R11: 0000000000000000 R12: 0000000000000000 R13: dffffc0000000000 R14: ffffffff89dd64ad 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: 0033:0x7f86b005be99 RSP: 002b:00007f86ae9d1168 EFLAGS: 00000246 ORIG_RAX: 0000000000000031 RAX: ffffffffffffffda RBX: 00007f86b016ef60 RCX: 00007f86b005be99 RDX: 0000000000000006 RSI: 00000000200000c0 RDI: 0000000000000006 RBP: 00007f86b00b6031 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 00007ffd854dc8af R14: 00007f86ae9d1300 R15: 0000000000022000 Code: 83 3d fc 9e 0b 0a 01 7f 02 5d c3 89 ef 5d e9 4d c9 de 05 48 c7 c7 c0 23 2e 8b e8 94 64 5c 00 eb df 66 90 89 ff 89 b7 00 c0 5f ff 0f 1f 80 00 00 00 00 48 b8 00 00 00 00 00 fc ff df 53 89 fb ---------------- Code disassembly (best guess): 0: 49 89 dc mov %rbx,%r12 3: 41 be ff 00 00 00 mov $0xff,%r14d 9: 49 c1 ed 03 shr $0x3,%r13 d: 41 83 e4 07 and $0x7,%r12d 11: 48 b8 00 00 00 00 00 movabs $0xdffffc0000000000,%rax 18: fc ff df 1b: 49 01 c5 add %rax,%r13 1e: 41 83 c4 03 add $0x3,%r12d 22: eb 02 jmp 0x26 24: f3 90 pause 26: 41 0f b6 45 00 movzbl 0x0(%r13),%eax * 2b: 41 38 c4 cmp %al,%r12b <-- trapping instruction 2e: 7c 08 jl 0x38 30: 84 c0 test %al,%al 32: 0f 85 9e 00 00 00 jne 0xd6 38: 8b 03 mov (%rbx),%eax 3a: 83 f8 01 cmp $0x1,%eax 3d: 75 e5 jne 0x24 3f: f0 lock