watchdog: BUG: soft lockup - CPU#0 stuck for 23s! [syz-executor.3:20795] Modules linked in: irq event stamp: 3065934 hardirqs last enabled at (3065933): [] restore_regs_and_return_to_kernel+0x0/0x2a hardirqs last disabled at (3065934): [] apic_timer_interrupt+0x8e/0xa0 arch/x86/entry/entry_64.S:793 softirqs last enabled at (40480): [] __do_softirq+0x68b/0x9ff kernel/softirq.c:314 softirqs last disabled at (40389): [] invoke_softirq kernel/softirq.c:368 [inline] softirqs last disabled at (40389): [] irq_exit+0x193/0x240 kernel/softirq.c:409 CPU: 0 PID: 20795 Comm: syz-executor.3 Not tainted 4.14.262-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 task: ffff88809100a080 task.stack: ffff8880548b0000 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+0x271/0x910 kernel/locking/qspinlock.c:465 RSP: 0018:ffff8880548b7b48 EFLAGS: 00000206 ORIG_RAX: ffffffffffffff10 RAX: 0000000000000000 RBX: ffff8880ba434f00 RCX: fffffbfff13baccd RDX: 000000000000613a RSI: 0000000000000004 RDI: 0000000000000286 RBP: ffffffff89dd666c R08: 0000000000000001 R09: 0000000000000000 R10: 0000000000000001 R11: 0000000000000000 R12: 0000000000000000 R13: dffffc0000000000 R14: ffffffff89dd666d R15: ffffed10174869e8 FS: 00007ff0b13cf700(0000) GS:ffff8880ba400000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007f56bd63a028 CR3: 00000000a806e000 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: 0033:0x7ff0b2a59fe9 RSP: 002b:00007ff0b13cf168 EFLAGS: 00000246 ORIG_RAX: 0000000000000031 RAX: ffffffffffffffda RBX: 00007ff0b2b6cf60 RCX: 00007ff0b2a59fe9 RDX: 0000000000000006 RSI: 0000000020000240 RDI: 0000000000000004 RBP: 00007ff0b2ab408d R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 00007ffd8a8c550f R14: 00007ff0b13cf300 R15: 0000000000022000 Code: 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 c0 75 dd Sending NMI from CPU 0 to CPUs 1: NMI backtrace for cpu 1 CPU: 1 PID: 20786 Comm: syz-executor.5 Not tainted 4.14.262-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 task: ffff888055fa80c0 task.stack: ffff888093e50000 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:ffff888093e57d10 EFLAGS: 00000206 RAX: 0000000000000101 RBX: ffffffff89dd6668 RCX: 00000000000050e9 RDX: 0000000000000000 RSI: 0000000000000001 RDI: ffffffff89dd6668 RBP: ffffffff89dd666c R08: ffffffff8b9c6208 R09: 00000000000405a1 R10: ffff888055fa8998 R11: ffff888055fa80c0 R12: 0000000000000003 R13: fffffbfff13baccd R14: 00000000000000ff R15: ffff88809948c010 FS: 000055555667d400(0000) GS:ffff8880ba500000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 0000001b2f224000 CR3: 00000000aaa7f000 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_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: 0033:0x7f8295fc3c2b RSP: 002b:00007ffee1aeda30 EFLAGS: 00000293 ORIG_RAX: 0000000000000003 RAX: 0000000000000000 RBX: 0000000000000007 RCX: 00007f8295fc3c2b RDX: ffffffffffffffbc RSI: ffffffffffffffff RDI: 0000000000000006 RBP: 00007f8296125960 R08: 0000000000000000 R09: 00007f8296129160 R10: 00007ffee1aedb30 R11: 0000000000000293 R12: 000000000004c595 R13: 00007ffee1aedb30 R14: 00007f8296123f60 R15: 0000000000000032 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 ee mov %ebp,%esi 2: c6 45 01 01 movb $0x1,0x1(%rbp) 6: ba 00 80 00 00 mov $0x8000,%edx b: 48 c1 e9 03 shr $0x3,%rcx f: 83 e6 07 and $0x7,%esi 12: 41 b8 01 00 00 00 mov $0x1,%r8d 18: 4c 01 e9 add %r13,%rcx 1b: eb 0b jmp 0x28 1d: f3 90 pause 1f: 83 ea 01 sub $0x1,%edx 22: 0f 84 42 04 00 00 je 0x46a 28: 0f b6 01 movzbl (%rcx),%eax * 2b: 40 38 f0 cmp %sil,%al <-- trapping instruction 2e: 7f 08 jg 0x38 30: 84 c0 test %al,%al 32: 0f 85 4b 05 00 00 jne 0x583 38: 0f b6 45 00 movzbl 0x0(%rbp),%eax 3c: 84 c0 test %al,%al 3e: 75 dd jne 0x1d