watchdog: BUG: soft lockup - CPU#0 stuck for 22s! [syz-executor.2:12838] Modules linked in: irq event stamp: 3510372 hardirqs last enabled at (3510371): [] restore_regs_and_return_to_kernel+0x0/0x2a hardirqs last disabled at (3510372): [] apic_timer_interrupt+0x8e/0xa0 arch/x86/entry/entry_64.S:793 softirqs last enabled at (62852): [] __do_softirq+0x68b/0x9ff kernel/softirq.c:314 softirqs last disabled at (62615): [] invoke_softirq kernel/softirq.c:368 [inline] softirqs last disabled at (62615): [] irq_exit+0x193/0x240 kernel/softirq.c:409 CPU: 0 PID: 12838 Comm: syz-executor.2 Not tainted 4.14.262-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 task: ffff8880a07da440 task.stack: ffff8880718a0000 RIP: 0010:__read_once_size include/linux/compiler.h:185 [inline] RIP: 0010:trylock_clear_pending kernel/locking/qspinlock_paravirt.h:99 [inline] RIP: 0010:pv_wait_head_or_lock kernel/locking/qspinlock_paravirt.h:412 [inline] RIP: 0010:__pv_queued_spin_lock_slowpath+0x26e/0x910 kernel/locking/qspinlock.c:465 RSP: 0018:ffff8880718a7b48 EFLAGS: 00000212 ORIG_RAX: ffffffffffffff10 RAX: 0000000000000003 RBX: ffff8880ba434f00 RCX: fffffbfff13baccd RDX: 000000000000201f RSI: 0000000000000004 RDI: 0000000000000286 RBP: ffffffff89dd666c R08: 0000000000000001 R09: 0000000000000000 R10: 0000000000000001 R11: 0000000000000000 R12: 0000000000000000 R13: dffffc0000000000 R14: ffffffff89dd666d R15: ffffed10174869e8 FS: 00007fa47ab76700(0000) GS:ffff8880ba400000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 0000000000000000 CR3: 000000009d875000 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_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: 0033:0x7fa47c200fe9 RSP: 002b:00007fa47ab76168 EFLAGS: 00000246 ORIG_RAX: 0000000000000031 RAX: ffffffffffffffda RBX: 00007fa47c313f60 RCX: 00007fa47c200fe9 RDX: 0000000000000006 RSI: 0000000020000240 RDI: 0000000000000004 RBP: 00007fa47c25b08d R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 00007fff70b53f1f R14: 00007fa47ab76300 R15: 0000000000022000 Code: 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 4b 05 00 00 0f b6 45 00 84 Sending NMI from CPU 0 to CPUs 1: NMI backtrace for cpu 1 CPU: 1 PID: 12843 Comm: syz-executor.1 Not tainted 4.14.262-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 task: ffff88809f98a440 task.stack: ffff88806f998000 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:ffff88806f99fd38 EFLAGS: 00000206 RAX: 0000000000000101 RBX: ffffffff89dd6668 RCX: 00000000000014c8 RDX: 0000000000000000 RSI: 0000000000000001 RDI: ffffffff89dd6668 RBP: ffffffff89dd666c R08: ffffffff8b9a8100 R09: 000000000004059a R10: ffff88809f98acf0 R11: ffff88809f98a440 R12: 0000000000000003 R13: fffffbfff13baccd R14: 00000000000000ff R15: ffffffff8863c1e0 FS: 00007faa48191700(0000) GS:ffff8880ba500000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007faa4992f028 CR3: 00000000b4d60000 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_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: 0033:0x7faa4981bfe9 RSP: 002b:00007faa48191108 EFLAGS: 00000246 ORIG_RAX: 0000000000000029 RAX: ffffffffffffffda RBX: 00007faa4992ef60 RCX: 00007faa4981bfe9 RDX: 0000000000000001 RSI: 0000000000000003 RDI: 000000000000001f RBP: 0000000000000003 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 00007ffe2b01f39f R14: 00007faa48191300 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: 89 e9 mov %ebp,%ecx 2: 48 89 ee mov %rbp,%rsi 5: c6 45 01 01 movb $0x1,0x1(%rbp) 9: ba 00 80 00 00 mov $0x8000,%edx e: 48 c1 e9 03 shr $0x3,%rcx 12: 83 e6 07 and $0x7,%esi 15: 41 b8 01 00 00 00 mov $0x1,%r8d 1b: 4c 01 e9 add %r13,%rcx 1e: eb 0b jmp 0x2b 20: f3 90 pause 22: 83 ea 01 sub $0x1,%edx 25: 0f 84 42 04 00 00 je 0x46d * 2b: 0f b6 01 movzbl (%rcx),%eax <-- trapping instruction 2e: 40 38 f0 cmp %sil,%al 31: 7f 08 jg 0x3b 33: 84 c0 test %al,%al 35: 0f 85 4b 05 00 00 jne 0x586 3b: 0f b6 45 00 movzbl 0x0(%rbp),%eax 3f: 84 .byte 0x84