watchdog: BUG: soft lockup - CPU#0 stuck for 23s! [syz-executor.4:27897] Modules linked in: irq event stamp: 3119180 hardirqs last enabled at (3119179): [] restore_regs_and_return_to_kernel+0x0/0x2a hardirqs last disabled at (3119180): [] apic_timer_interrupt+0x8e/0xa0 arch/x86/entry/entry_64.S:793 softirqs last enabled at (252176): [] __do_softirq+0x68b/0x9ff kernel/softirq.c:314 softirqs last disabled at (251957): [] invoke_softirq kernel/softirq.c:368 [inline] softirqs last disabled at (251957): [] irq_exit+0x193/0x240 kernel/softirq.c:409 CPU: 0 PID: 27897 Comm: syz-executor.4 Not tainted 4.14.231-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 task: ffff8880214a0200 task.stack: ffff88822e948000 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:ffff88822e94fb48 EFLAGS: 00000206 ORIG_RAX: ffffffffffffff10 RAX: 0000000000000003 RBX: ffff8880ba42ae80 RCX: fffffbfff13ba885 RDX: 000000000000070b RSI: 0000000000000004 RDI: 0000000000000286 RBP: ffffffff89dd442c R08: 0000000000000001 R09: 0000000000000000 R10: 0000000000000001 R11: 0000000000000000 R12: 0000000000000000 R13: dffffc0000000000 R14: ffffffff89dd442d R15: ffffed10174855d8 FS: 00007f7ce57f5700(0000) GS:ffff8880ba400000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 0000001b32523000 CR3: 000000002ab04000 CR4: 00000000001406f0 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:261 hci_send_monitor_ctrl_event+0x3dd/0x500 net/bluetooth/hci_sock.c:391 mgmt_send_event+0x2b3/0x330 net/bluetooth/mgmt_util.c:86 mgmt_index_event net/bluetooth/mgmt.c:253 [inline] mgmt_index_removed+0x200/0x240 net/bluetooth/mgmt.c:6594 hci_sock_bind+0xce1/0x1170 net/bluetooth/hci_sock.c:1169 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: 0033:0x4665f9 RSP: 002b:00007f7ce57f5188 EFLAGS: 00000246 ORIG_RAX: 0000000000000031 RAX: ffffffffffffffda RBX: 000000000056bf60 RCX: 00000000004665f9 RDX: 0000000000000006 RSI: 0000000020000000 RDI: 0000000000000005 RBP: 00000000004bfbb9 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 000000000056bf60 R13: 00007ffcf8f9b47f R14: 00007f7ce57f5300 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: 27901 Comm: syz-executor.5 Not tainted 4.14.231-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 task: ffff88809e43e680 task.stack: ffff888234660000 RIP: 0010:__read_once_size include/linux/compiler.h:183 [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:ffff888234667d38 EFLAGS: 00000206 RAX: 0000000000000101 RBX: ffffffff89dd4428 RCX: 00000000000024f1 RDX: 0000000000000000 RSI: 0000000000000001 RDI: ffffffff89dd4428 RBP: ffffffff89dd442c R08: ffffffff8b9a2248 R09: 00000000000405a2 R10: ffff88809e43ef30 R11: ffff88809e43e680 R12: 0000000000000003 R13: fffffbfff13ba885 R14: 00000000000000ff R15: ffffffff8863a320 FS: 00007f0ebd8d0700(0000) GS:ffff8880ba500000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 0000000000568000 CR3: 000000003d8e4000 CR4: 00000000001406e0 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_link+0x1f/0x120 net/bluetooth/af_bluetooth.c:143 hci_sock_create+0x15c/0x1d0 net/bluetooth/hci_sock.c:2017 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: 0033:0x4665f9 RSP: 002b:00007f0ebd8d0128 EFLAGS: 00000246 ORIG_RAX: 0000000000000029 RAX: ffffffffffffffda RBX: 000000000056bf60 RCX: 00000000004665f9 RDX: 0000000000000001 RSI: 0000000000000003 RDI: 000000000000001f RBP: 0000000000000003 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 000000000056bf60 R13: 00007ffe2455467f R14: 00007f0ebd8d0300 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