watchdog: BUG: soft lockup - CPU#0 stuck for 23s! [syz-executor.3:10016] Modules linked in: irq event stamp: 2815752 hardirqs last enabled at (2815751): [] restore_regs_and_return_to_kernel+0x0/0x2a hardirqs last disabled at (2815752): [] apic_timer_interrupt+0x8e/0xa0 arch/x86/entry/entry_64.S:793 softirqs last enabled at (9618): [] __do_softirq+0x68b/0x9ff kernel/softirq.c:314 softirqs last disabled at (8687): [] invoke_softirq kernel/softirq.c:368 [inline] softirqs last disabled at (8687): [] irq_exit+0x193/0x240 kernel/softirq.c:409 CPU: 0 PID: 10016 Comm: syz-executor.3 Not tainted 4.14.280-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 task: ffff8880959c8080 task.stack: ffff8880937e8000 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:ffff8880937ef988 EFLAGS: 00000206 ORIG_RAX: ffffffffffffff10 RAX: 0000000000000003 RBX: ffff8880ba434f00 RCX: fffffbfff13bb6cd RDX: 0000000000005099 RSI: 0000000000000004 RDI: 0000000000000282 RBP: ffffffff89ddb66c R08: 0000000000000001 R09: 0000000000000000 R10: 0000000000000001 R11: 0000000000000000 R12: 0000000000000000 R13: dffffc0000000000 R14: ffffffff89ddb66d R15: ffffed10174869e8 FS: 00007fc73dce0700(0000) GS:ffff8880ba400000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 0000001b2ea29000 CR3: 00000000ab9a6000 CR4: 00000000003406f0 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_event net/bluetooth/mgmt.c:270 [inline] unblock_device+0x135/0x1f0 net/bluetooth/mgmt.c:3840 hci_mgmt_cmd net/bluetooth/hci_sock.c:1590 [inline] hci_sock_sendmsg+0x175b/0x1d00 net/bluetooth/hci_sock.c:1725 sock_sendmsg_nosec net/socket.c:646 [inline] sock_sendmsg+0xb5/0x100 net/socket.c:656 sock_write_iter+0x22c/0x370 net/socket.c:925 call_write_iter include/linux/fs.h:1780 [inline] new_sync_write fs/read_write.c:469 [inline] __vfs_write+0x44c/0x630 fs/read_write.c:482 vfs_write+0x17f/0x4d0 fs/read_write.c:544 SYSC_write fs/read_write.c:590 [inline] SyS_write+0xf2/0x210 fs/read_write.c:582 do_syscall_64+0x1d5/0x640 arch/x86/entry/common.c:292 entry_SYSCALL_64_after_hwframe+0x46/0xbb RIP: 0033:0x7fc73f36b0f9 RSP: 002b:00007fc73dce0168 EFLAGS: 00000246 ORIG_RAX: 0000000000000001 RAX: ffffffffffffffda RBX: 00007fc73f47df60 RCX: 00007fc73f36b0f9 RDX: 000000000000000d RSI: 00000000200000c0 RDI: 0000000000000006 RBP: 00007fc73f3c508d R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 00007ffecff7380f R14: 00007fc73dce0300 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 0 to CPUs 1: NMI backtrace for cpu 1 CPU: 1 PID: 10017 Comm: syz-executor.4 Not tainted 4.14.280-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 task: ffff888096c62100 task.stack: ffff8880b3640000 RIP: 0010:native_apic_mem_write+0x8/0x10 arch/x86/include/asm/apic.h:100 RSP: 0018:ffff8880ba507eb8 EFLAGS: 00000046 RAX: dffffc0000000000 RBX: ffffffff88cca000 RCX: 0000000000000020 RDX: 1ffffffff119941d RSI: 000000000000003e RDI: 0000000000000380 RBP: ffff8880ba5282c0 R08: ffff88823fff7058 R09: ffff88823fff704f R10: ffff88823fff7057 R11: 0000002a55d5fe29 R12: 000000000000003e R13: 0000000000000003 R14: 000000292073e9cf R15: 00000030d95da840 FS: 00007fe37159c700(0000) GS:ffff8880ba500000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 0000001b2ed27000 CR3: 00000000a1986000 CR4: 00000000003406e0 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:__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:ffff8880b3647d38 EFLAGS: 00000206 ORIG_RAX: ffffffffffffff10 RAX: 0000000000000000 RBX: ffffffff89ddb668 RCX: 0000000000005275 RDX: 0000000000000000 RSI: 0000000000000001 RDI: ffffffff89ddb668 RBP: ffffffff89ddb66c R08: ffffffff8b9cee68 R09: 00000000000405a0 R10: ffff888096c629b0 R11: ffff888096c62100 R12: 0000000000000003 R13: fffffbfff13bb6cd R14: 00000000000000ff R15: ffffffff8863eb80 queued_write_lock include/asm-generic/qrwlock.h:134 [inline] do_raw_write_lock+0xc2/0x1d0 kernel/locking/spinlock_debug.c:203 bt_sock_link+0x1f/0x120 net/bluetooth/af_bluetooth.c:143 hci_sock_create+0x15c/0x1d0 net/bluetooth/hci_sock.c:2034 bt_sock_create+0x13b/0x280 net/bluetooth/af_bluetooth.c:130 __sock_create+0x303/0x620 net/socket.c:1275 sock_create net/socket.c:1315 [inline] SYSC_socket net/socket.c:1345 [inline] SyS_socket+0xd1/0x1b0 net/socket.c:1325 do_syscall_64+0x1d5/0x640 arch/x86/entry/common.c:292 entry_SYSCALL_64_after_hwframe+0x46/0xbb RIP: 0033:0x7fe372c270f9 RSP: 002b:00007fe37159c108 EFLAGS: 00000246 ORIG_RAX: 0000000000000029 RAX: ffffffffffffffda RBX: 00007fe372d39f60 RCX: 00007fe372c270f9 RDX: 0000000000000001 RSI: 0000000000000003 RDI: 000000000000001f RBP: 0000000000000004 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 00007fffd97854df R14: 00007fe37159c300 R15: 0000000000022000 Code: 83 3d ec 1a 0c 0a 01 7f 02 5d c3 89 ef 5d e9 02 55 df 05 48 c7 c7 c0 a3 2e 8b e8 64 75 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: 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