INFO: rcu_sched self-detected stall on CPU 0-...!: (1 GPs behind) idle=162/1/4611686018427387906 softirq=99103/99105 fqs=42 (t=125000 jiffies g=46335 c=46334 q=886) rcu_sched kthread starved for 124824 jiffies! g46335 c46334 f0x0 RCU_GP_WAIT_FQS(3) ->state=0x402 ->cpu=1 rcu_sched I24616 8 2 0x80000000 Call Trace: context_switch kernel/sched/core.c:2862 [inline] __schedule+0x8fb/0x1ec0 kernel/sched/core.c:3440 schedule+0xf5/0x430 kernel/sched/core.c:3499 schedule_timeout+0x118/0x230 kernel/time/timer.c:1801 rcu_gp_kthread+0x9dd/0x18e0 kernel/rcu/tree.c:2230 kthread+0x33c/0x400 kernel/kthread.c:238 ret_from_fork+0x3a/0x50 arch/x86/entry/entry_64.S:406 NMI backtrace for cpu 0 CPU: 0 PID: 12241 Comm: syz-executor4 Not tainted 4.16.0-rc6+ #286 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+0x194/0x24d lib/dump_stack.c:53 nmi_cpu_backtrace+0x1d2/0x210 lib/nmi_backtrace.c:103 nmi_trigger_cpumask_backtrace+0x123/0x180 lib/nmi_backtrace.c:62 arch_trigger_cpumask_backtrace+0x14/0x20 arch/x86/kernel/apic/hw_nmi.c:38 trigger_single_cpu_backtrace include/linux/nmi.h:156 [inline] rcu_dump_cpu_stacks+0x186/0x1de kernel/rcu/tree.c:1375 print_cpu_stall kernel/rcu/tree.c:1524 [inline] check_cpu_stall.isra.61+0xbb8/0x15b0 kernel/rcu/tree.c:1592 __rcu_pending kernel/rcu/tree.c:3361 [inline] rcu_pending kernel/rcu/tree.c:3423 [inline] rcu_check_callbacks+0x238/0xd20 kernel/rcu/tree.c:2763 update_process_times+0x30/0x60 kernel/time/timer.c:1636 tick_sched_handle+0x85/0x160 kernel/time/tick-sched.c:162 tick_sched_timer+0x42/0x120 kernel/time/tick-sched.c:1194 __run_hrtimer kernel/time/hrtimer.c:1349 [inline] __hrtimer_run_queues+0x39c/0xec0 kernel/time/hrtimer.c:1411 hrtimer_interrupt+0x2a5/0x6f0 kernel/time/hrtimer.c:1469 local_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1025 [inline] smp_apic_timer_interrupt+0x14a/0x700 arch/x86/kernel/apic/apic.c:1050 apic_timer_interrupt+0xf/0x20 arch/x86/entry/entry_64.S:857 RIP: 0010:rep_nop arch/x86/include/asm/processor.h:657 [inline] RIP: 0010:cpu_relax arch/x86/include/asm/processor.h:662 [inline] RIP: 0010:virt_spin_lock arch/x86/include/asm/qspinlock.h:69 [inline] RIP: 0010:native_queued_spin_lock_slowpath+0x1c2/0xfa0 kernel/locking/qspinlock.c:305 RSP: 0018:ffff8801b8ef21d0 EFLAGS: 00000202 ORIG_RAX: ffffffffffffff12 RAX: 0000000000000001 RBX: ffff8801c6e57600 RCX: dffffc0000000000 RDX: 0000000000000004 RSI: ffff8801b8ef22a0 RDI: ffff8801c6e57600 RBP: ffff8801b8ef2548 R08: ffffffff85142d51 R09: 0000000000000000 R10: ffff8801b8ef2468 R11: ffff8801c6e57618 R12: ffffed00371de454 R13: ffff8801b8ef2520 R14: 1ffff100371de440 R15: 0000000000000003 pv_queued_spin_lock_slowpath arch/x86/include/asm/paravirt.h:669 [inline] queued_spin_lock_slowpath arch/x86/include/asm/qspinlock.h:30 [inline] queued_spin_lock include/asm-generic/qspinlock.h:90 [inline] do_raw_spin_lock+0x185/0x220 kernel/locking/spinlock_debug.c:113 __raw_spin_lock include/linux/spinlock_api_smp.h:143 [inline] _raw_spin_lock+0x32/0x40 kernel/locking/spinlock.c:144 spin_lock include/linux/spinlock.h:310 [inline] __netif_tx_lock include/linux/netdevice.h:3575 [inline] sch_direct_xmit+0x361/0x1140 net/sched/sch_generic.c:325 qdisc_restart net/sched/sch_generic.c:393 [inline] __qdisc_run+0x57d/0x18e0 net/sched/sch_generic.c:401 __dev_xmit_skb net/core/dev.c:3241 [inline] __dev_queue_xmit+0xb8b/0x2fc0 net/core/dev.c:3549 dev_queue_xmit+0x17/0x20 net/core/dev.c:3614 br_dev_queue_push_xmit+0x196/0x5a0 net/bridge/br_forward.c:55 NF_HOOK include/linux/netfilter.h:288 [inline] br_forward_finish+0xc8/0x530 net/bridge/br_forward.c:67 NF_HOOK include/linux/netfilter.h:288 [inline] __br_forward+0x533/0xc80 net/bridge/br_forward.c:112 br_flood+0x665/0x770 net/bridge/br_forward.c:225 br_dev_xmit+0xa68/0x1550 net/bridge/br_device.c:87 __netdev_start_xmit include/linux/netdevice.h:4080 [inline] netdev_start_xmit include/linux/netdevice.h:4089 [inline] xmit_one net/core/dev.c:3050 [inline] dev_hard_start_xmit+0x24e/0xac0 net/core/dev.c:3066 __dev_queue_xmit+0x26bf/0x2fc0 net/core/dev.c:3581 dev_queue_xmit+0x17/0x20 net/core/dev.c:3614 neigh_hh_output include/net/neighbour.h:472 [inline] neigh_output include/net/neighbour.h:480 [inline] ip_finish_output2+0xf4d/0x1550 net/ipv4/ip_output.c:229 ip_finish_output+0x864/0xd60 net/ipv4/ip_output.c:317 NF_HOOK_COND include/linux/netfilter.h:277 [inline] ip_mc_output+0x271/0x1350 net/ipv4/ip_output.c:390 dst_output include/net/dst.h:444 [inline] ip_local_out+0x95/0x160 net/ipv4/ip_output.c:124 iptunnel_xmit+0x556/0x810 net/ipv4/ip_tunnel_core.c:91 ip_tunnel_xmit+0x177b/0x3550 net/ipv4/ip_tunnel.c:768 __gre_xmit+0x546/0x8b0 net/ipv4/ip_gre.c:449 erspan_xmit+0x779/0x22a0 net/ipv4/ip_gre.c:731 __netdev_start_xmit include/linux/netdevice.h:4080 [inline] netdev_start_xmit include/linux/netdevice.h:4089 [inline] xmit_one net/core/dev.c:3050 [inline] dev_hard_start_xmit+0x24e/0xac0 net/core/dev.c:3066 sch_direct_xmit+0x40d/0x1140 net/sched/sch_generic.c:327 qdisc_restart net/sched/sch_generic.c:393 [inline] __qdisc_run+0x57d/0x18e0 net/sched/sch_generic.c:401 __dev_xmit_skb net/core/dev.c:3241 [inline] __dev_queue_xmit+0xb8b/0x2fc0 net/core/dev.c:3549 dev_queue_xmit+0x17/0x20 net/core/dev.c:3614 br_dev_queue_push_xmit+0x196/0x5a0 net/bridge/br_forward.c:55 NF_HOOK include/linux/netfilter.h:288 [inline] br_forward_finish+0xc8/0x530 net/bridge/br_forward.c:67 NF_HOOK include/linux/netfilter.h:288 [inline] __br_forward+0x533/0xc80 net/bridge/br_forward.c:112 br_flood+0x665/0x770 net/bridge/br_forward.c:225 br_dev_xmit+0xa68/0x1550 net/bridge/br_device.c:87 __netdev_start_xmit include/linux/netdevice.h:4080 [inline] netdev_start_xmit include/linux/netdevice.h:4089 [inline] xmit_one net/core/dev.c:3050 [inline] dev_hard_start_xmit+0x24e/0xac0 net/core/dev.c:3066 __dev_queue_xmit+0x26bf/0x2fc0 net/core/dev.c:3581 dev_queue_xmit+0x17/0x20 net/core/dev.c:3614 neigh_resolve_output+0x5e2/0xa00 net/core/neighbour.c:1350 neigh_output include/net/neighbour.h:482 [inline] ip_finish_output2+0x91a/0x1550 net/ipv4/ip_output.c:229 ip_finish_output+0x864/0xd60 net/ipv4/ip_output.c:317 NF_HOOK_COND include/linux/netfilter.h:277 [inline] ip_mc_output+0x271/0x1350 net/ipv4/ip_output.c:390 dst_output include/net/dst.h:444 [inline] ip_local_out+0x95/0x160 net/ipv4/ip_output.c:124 ip_queue_xmit+0x8c0/0x1920 net/ipv4/ip_output.c:504 sctp_v4_xmit+0x108/0x140 net/sctp/protocol.c:942 sctp_packet_transmit+0x22a5/0x37c0 net/sctp/output.c:642 sctp_outq_flush+0xabb/0x4060 net/sctp/outqueue.c:911 sctp_outq_uncork+0x5a/0x70 net/sctp/outqueue.c:776 sctp_cmd_interpreter net/sctp/sm_sideeffect.c:1820 [inline] sctp_side_effects net/sctp/sm_sideeffect.c:1220 [inline] sctp_do_sm+0x4e0/0x7040 net/sctp/sm_sideeffect.c:1191 sctp_primitive_ASSOCIATE+0x9d/0xd0 net/sctp/primitive.c:88 sctp_sendmsg_to_asoc+0x14bf/0x1ec0 net/sctp/socket.c:1900 sctp_sendmsg+0xc50/0x1ad0 net/sctp/socket.c:2088 inet_sendmsg+0x11f/0x5e0 net/ipv4/af_inet.c:763 sock_sendmsg_nosec net/socket.c:629 [inline] sock_sendmsg+0xca/0x110 net/socket.c:639 ___sys_sendmsg+0x767/0x8b0 net/socket.c:2047 __sys_sendmsg+0xe5/0x210 net/socket.c:2081 SYSC_sendmsg net/socket.c:2092 [inline] SyS_sendmsg+0x2d/0x50 net/socket.c:2088 do_syscall_64+0x281/0x940 arch/x86/entry/common.c:287 entry_SYSCALL_64_after_hwframe+0x42/0xb7 RIP: 0033:0x4548b9 RSP: 002b:00007fcb31354c68 EFLAGS: 00000246 ORIG_RAX: 000000000000002e RAX: ffffffffffffffda RBX: 00007fcb313556d4 RCX: 00000000004548b9 RDX: 0000000000000040 RSI: 0000000020001f00 RDI: 0000000000000013 RBP: 000000000072bea0 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 00000000ffffffff R13: 00000000000004e3 R14: 00000000006f95e8 R15: 0000000000000000