RDX: 0000000000000006 RSI: 0000000020000040 RDI: 0000000000000004 RBP: 00007f998a99a1d0 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000001 R13: 00007ffecf8ef35f R14: 00007f998a99a300 R15: 0000000000022000 watchdog: BUG: soft lockup - CPU#1 stuck for 22s! [syz-executor.3:16955] Modules linked in: irq event stamp: 4982 hardirqs last enabled at (4981): [] restore_regs_and_return_to_kernel+0x0/0x2a hardirqs last disabled at (4982): [] apic_timer_interrupt+0x8e/0xa0 arch/x86/entry/entry_64.S:793 softirqs last enabled at (332): [] __do_softirq+0x68b/0x9ff kernel/softirq.c:314 softirqs last disabled at (111): [] invoke_softirq kernel/softirq.c:368 [inline] softirqs last disabled at (111): [] irq_exit+0x193/0x240 kernel/softirq.c:409 CPU: 1 PID: 16955 Comm: syz-executor.3 Not tainted 4.14.282-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 task: ffff88808f3780c0 task.stack: ffff8880a0850000 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:ffff8880a0857d38 EFLAGS: 00000206 ORIG_RAX: ffffffffffffff10 RAX: 0000000000000000 RBX: ffffffff89ddb868 RCX: 0000000000007be6 RDX: 0000000000000000 RSI: 0000000000000001 RDI: ffffffff89ddb868 RBP: ffffffff89ddb86c R08: ffffffff8b9e39f0 R09: 00000000000405a1 R10: ffff88808f378970 R11: ffff88808f3780c0 R12: 0000000000000003 R13: fffffbfff13bb70d R14: 00000000000000ff R15: ffffffff8863eb80 FS: 00007f1791adf700(0000) GS:ffff8880ba500000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007f179327d028 CR3: 0000000099e60000 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: 0033:0x7f179316a109 RSP: 002b:00007f1791adf108 EFLAGS: 00000246 ORIG_RAX: 0000000000000029 RAX: ffffffffffffffda RBX: 00007f179327cf60 RCX: 00007f179316a109 RDX: 0000000000000001 RSI: 0000000000000003 RDI: 000000000000001f RBP: 0000000000000003 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 00007fff687ad9cf R14: 00007f1791adf300 R15: 0000000000022000 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 1 to CPUs 0: NMI backtrace for cpu 0 skipped: idling at pc 0xffffffff87246dce ---------------- 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