EXT4-fs error (device loop0): ext4_fill_super:4365: inode #2: comm syz-executor.0: iget: checksum invalid INFO: rcu_sched self-detected stall on CPU 1-...: (10499 ticks this GP) idle=cc2/140000000000001/0 softirq=24703/24703 fqs=0 (t=10500 jiffies g=3142 c=3141 q=2) rcu_sched kthread starved for 10500 jiffies! g3142 c3141 f0x0 RCU_GP_WAIT_FQS(3) ->state=0x0 ->cpu=0 rcu_sched R running task 30008 9 2 0x80000000 Call Trace: context_switch kernel/sched/core.c:2808 [inline] __schedule+0x88b/0x1de0 kernel/sched/core.c:3384 schedule+0x8d/0x1b0 kernel/sched/core.c:3428 schedule_timeout+0x4af/0xe90 kernel/time/timer.c:1747 rcu_gp_kthread+0xc0a/0x1e60 kernel/rcu/tree.c:2255 kthread+0x30d/0x420 kernel/kthread.c:232 ret_from_fork+0x24/0x30 arch/x86/entry/entry_64.S:404 NMI backtrace for cpu 1 CPU: 1 PID: 16481 Comm: syz-executor.4 Not tainted 4.14.217-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 Call Trace: __dump_stack lib/dump_stack.c:17 [inline] dump_stack+0x1b2/0x281 lib/dump_stack.c:58 nmi_cpu_backtrace.cold+0x57/0x93 lib/nmi_backtrace.c:101 nmi_trigger_cpumask_backtrace+0x13a/0x180 lib/nmi_backtrace.c:62 trigger_single_cpu_backtrace include/linux/nmi.h:158 [inline] rcu_dump_cpu_stacks+0x15f/0x19c kernel/rcu/tree.c:1396 print_cpu_stall kernel/rcu/tree.c:1542 [inline] check_cpu_stall kernel/rcu/tree.c:1610 [inline] __rcu_pending kernel/rcu/tree.c:3390 [inline] rcu_pending kernel/rcu/tree.c:3452 [inline] rcu_check_callbacks.cold+0x464/0xd8d kernel/rcu/tree.c:2792 update_process_times+0x29/0x60 kernel/time/timer.c:1591 tick_sched_handle+0x7d/0x150 kernel/time/tick-sched.c:165 tick_sched_timer+0x92/0x200 kernel/time/tick-sched.c:1223 __run_hrtimer kernel/time/hrtimer.c:1223 [inline] __hrtimer_run_queues+0x30b/0xc80 kernel/time/hrtimer.c:1287 hrtimer_interrupt+0x1e6/0x5e0 kernel/time/hrtimer.c:1321 local_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1075 [inline] smp_apic_timer_interrupt+0x117/0x5e0 arch/x86/kernel/apic/apic.c:1100 apic_timer_interrupt+0x93/0xa0 arch/x86/entry/entry_64.S:793 RIP: 0010:native_safe_halt+0xe/0x10 arch/x86/include/asm/irqflags.h:61 RSP: 0018:ffff888050f6fb20 EFLAGS: 00000286 ORIG_RAX: ffffffffffffff10 RAX: 1ffffffff11e1254 RBX: ffffffff89dd29ac RCX: 1ffff11012502557 RDX: dffffc0000000000 RSI: ffff888092812a98 RDI: ffff888092812a44 RBP: 0000000000000003 R08: 0000000000000001 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000000 R12: 0000000000000282 R13: dffffc0000000000 R14: ffffffff89dd29ad R15: ffffed10174a55d8 arch_safe_halt arch/x86/include/asm/paravirt.h:94 [inline] kvm_wait arch/x86/kernel/kvm.c:600 [inline] kvm_wait+0x179/0x240 arch/x86/kernel/kvm.c:580 pv_wait arch/x86/include/asm/paravirt.h:679 [inline] pv_wait_head_or_lock kernel/locking/qspinlock_paravirt.h:447 [inline] __pv_queued_spin_lock_slowpath+0x722/0x910 kernel/locking/qspinlock.c:465 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: 0033:0x45e219 RSP: 002b:00007fa67e4c9c68 EFLAGS: 00000246 ORIG_RAX: 0000000000000031 RAX: ffffffffffffffda RBX: 0000000000000003 RCX: 000000000045e219 RDX: 0000000000000006 RSI: 0000000020000040 RDI: 0000000000000005 RBP: 000000000119bfc0 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 000000000119bf8c R13: 00007fff2843d63f R14: 00007fa67e4ca9c0 R15: 000000000119bf8c INFO: rcu_preempt detected stalls on CPUs/tasks: Tasks blocked on level-0 rcu_node (CPUs 0-1): P4626 (detected by 1, t=10542 jiffies, g=4872, c=4871, q=98) systemd-udevd R running task 25872 4626 1 0x00000100 Call Trace: context_switch kernel/sched/core.c:2808 [inline] __schedule+0x88b/0x1de0 kernel/sched/core.c:3384 preempt_schedule_common+0x45/0xc0 kernel/sched/core.c:3508 ___preempt_schedule+0x16/0x18 __raw_spin_unlock_irqrestore include/linux/spinlock_api_smp.h:161 [inline] _raw_spin_unlock_irqrestore+0xaf/0xe0 kernel/locking/spinlock.c:192 spin_unlock_irqrestore include/linux/spinlock.h:372 [inline] __wake_up_common_lock+0xcd/0x140 kernel/sched/wait.c:126 sock_def_readable+0xf3/0x3f0 net/core/sock.c:2651 __netlink_sendskb net/netlink/af_netlink.c:1234 [inline] netlink_sendskb+0x7b/0xd0 net/netlink/af_netlink.c:1240 netlink_unicast+0x50a/0x610 net/netlink/af_netlink.c:1328 netlink_sendmsg+0x62e/0xb80 net/netlink/af_netlink.c:1878 sock_sendmsg_nosec net/socket.c:646 [inline] sock_sendmsg+0xb5/0x100 net/socket.c:656 ___sys_sendmsg+0x6c8/0x800 net/socket.c:2062 __sys_sendmsg+0xa3/0x120 net/socket.c:2096 SYSC_sendmsg net/socket.c:2107 [inline] SyS_sendmsg+0x27/0x40 net/socket.c:2103 do_syscall_64+0x1d5/0x640 arch/x86/entry/common.c:292 entry_SYSCALL_64_after_hwframe+0x46/0xbb RIP: 0033:0x7ffb79cade67 RSP: 002b:00007fff6f1ffc58 EFLAGS: 00000246 ORIG_RAX: 000000000000002e RAX: ffffffffffffffda RBX: 0000560ec81982e0 RCX: 00007ffb79cade67 RDX: 0000000000000000 RSI: 00007fff6f1ffc70 RDI: 0000000000000003 RBP: 00007fff6f1ffc70 R08: 0000560ec819a3f4 R09: 0000000000000000 R10: 0000000000000018 R11: 0000000000000246 R12: 0000560ec819d7e0 R13: 000000000000009b R14: 0000560ec8190ec0 R15: 0000000000000000 systemd-udevd R running task 25872 4626 1 0x00000100 Call Trace: context_switch kernel/sched/core.c:2808 [inline] __schedule+0x88b/0x1de0 kernel/sched/core.c:3384 preempt_schedule_common+0x45/0xc0 kernel/sched/core.c:3508 ___preempt_schedule+0x16/0x18 __raw_spin_unlock_irqrestore include/linux/spinlock_api_smp.h:161 [inline] _raw_spin_unlock_irqrestore+0xaf/0xe0 kernel/locking/spinlock.c:192 spin_unlock_irqrestore include/linux/spinlock.h:372 [inline] __wake_up_common_lock+0xcd/0x140 kernel/sched/wait.c:126 sock_def_readable+0xf3/0x3f0 net/core/sock.c:2651 __netlink_sendskb net/netlink/af_netlink.c:1234 [inline] netlink_sendskb+0x7b/0xd0 net/netlink/af_netlink.c:1240 netlink_unicast+0x50a/0x610 net/netlink/af_netlink.c:1328 netlink_sendmsg+0x62e/0xb80 net/netlink/af_netlink.c:1878 sock_sendmsg_nosec net/socket.c:646 [inline] sock_sendmsg+0xb5/0x100 net/socket.c:656 ___sys_sendmsg+0x6c8/0x800 net/socket.c:2062 __sys_sendmsg+0xa3/0x120 net/socket.c:2096 SYSC_sendmsg net/socket.c:2107 [inline] SyS_sendmsg+0x27/0x40 net/socket.c:2103 do_syscall_64+0x1d5/0x640 arch/x86/entry/common.c:292 entry_SYSCALL_64_after_hwframe+0x46/0xbb RIP: 0033:0x7ffb79cade67 RSP: 002b:00007fff6f1ffc58 EFLAGS: 00000246 ORIG_RAX: 000000000000002e RAX: ffffffffffffffda RBX: 0000560ec81982e0 RCX: 00007ffb79cade67 RDX: 0000000000000000 RSI: 00007fff6f1ffc70 RDI: 0000000000000003 RBP: 00007fff6f1ffc70 R08: 0000560ec819a3f4 R09: 0000000000000000 R10: 0000000000000018 R11: 0000000000000246 R12: 0000560ec819d7e0 R13: 000000000000009b R14: 0000560ec8190ec0 R15: 0000000000000000 rcu_preempt kthread starved for 10542 jiffies! g4872 c4871 f0x0 RCU_GP_WAIT_FQS(3) ->state=0x0 ->cpu=0 rcu_preempt R running task 30008 8 2 0x80000000 Call Trace: context_switch kernel/sched/core.c:2808 [inline] __schedule+0x88b/0x1de0 kernel/sched/core.c:3384 schedule+0x8d/0x1b0 kernel/sched/core.c:3428 schedule_timeout+0x4af/0xe90 kernel/time/timer.c:1747 rcu_gp_kthread+0xc0a/0x1e60 kernel/rcu/tree.c:2255 kthread+0x30d/0x420 kernel/kthread.c:232 ret_from_fork+0x24/0x30 arch/x86/entry/entry_64.S:404