rcu: INFO: rcu_preempt self-detected stall on CPU
rcu: 0-...!: (1 GPs behind) idle=2be/1/0x4000000000000002 softirq=111768/111770 fqs=34
(t=10501 jiffies g=168033 q=382)
rcu: rcu_preempt kthread starved for 10434 jiffies! g168033 f0x0 RCU_GP_WAIT_FQS(5) ->state=0x402 ->cpu=1
rcu: RCU grace-period kthread stack dump:
rcu_preempt I29256 10 2 0x80004000
Call Trace:
context_switch kernel/sched/core.c:3254 [inline]
__schedule+0x755/0x1580 kernel/sched/core.c:3880
schedule+0xd9/0x260 kernel/sched/core.c:3947
schedule_timeout+0x486/0xc50 kernel/time/timer.c:1807
rcu_gp_fqs_loop kernel/rcu/tree.c:1611 [inline]
rcu_gp_kthread+0x9b2/0x18c0 kernel/rcu/tree.c:1768
kthread+0x361/0x430 kernel/kthread.c:255
ret_from_fork+0x24/0x30 arch/x86/entry/entry_64.S:352
NMI backtrace for cpu 0
CPU: 0 PID: 29761 Comm: syz-executor.1 Not tainted 5.3.0-rc7+ #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
Call Trace:
__dump_stack lib/dump_stack.c:77 [inline]
dump_stack+0x172/0x1f0 lib/dump_stack.c:113
nmi_cpu_backtrace.cold+0x70/0xb2 lib/nmi_backtrace.c:101
nmi_trigger_cpumask_backtrace+0x23b/0x28b 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:164 [inline]
rcu_dump_cpu_stacks+0x183/0x1cf kernel/rcu/tree_stall.h:254
print_cpu_stall kernel/rcu/tree_stall.h:455 [inline]
check_cpu_stall kernel/rcu/tree_stall.h:529 [inline]
rcu_pending kernel/rcu/tree.c:2736 [inline]
rcu_sched_clock_irq.cold+0x4dd/0xc13 kernel/rcu/tree.c:2183
update_process_times+0x32/0x80 kernel/time/timer.c:1639
tick_sched_handle+0xa2/0x190 kernel/time/tick-sched.c:167
tick_sched_timer+0x53/0x140 kernel/time/tick-sched.c:1296
__run_hrtimer kernel/time/hrtimer.c:1389 [inline]
__hrtimer_run_queues+0x364/0xe40 kernel/time/hrtimer.c:1451
hrtimer_interrupt+0x314/0x770 kernel/time/hrtimer.c:1509
local_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1106 [inline]
smp_apic_timer_interrupt+0x160/0x610 arch/x86/kernel/apic/apic.c:1131
apic_timer_interrupt+0xf/0x20 arch/x86/entry/entry_64.S:830
RIP: 0010:__list_add include/linux/list.h:60 [inline]
RIP: 0010:list_add_tail include/linux/list.h:93 [inline]
RIP: 0010:list_move_tail include/linux/list.h:214 [inline]
RIP: 0010:hhf_dequeue+0x674/0xa20 net/sched/sch_hhf.c:439
Code: e8 03 42 80 3c 20 00 0f 85 5b 03 00 00 4d 8b bd 98 03 00 00 48 89 df 48 8b 55 c8 4c 89 fe e8 c3 cb 77 fd 31 ff 89 c6 88 45 b0 87 12 ac fb 0f b6 75 b0 40 84 f6 0f 84 c6 f9 ff ff e8 35 11 ac
RSP: 0018:ffff888049e36608 EFLAGS: 00000246 ORIG_RAX: ffffffffffffff13
RAX: 0000000000000001 RBX: ffff8880a3e99df8 RCX: ffffc90008162000
RDX: ffff8880a3e99e90 RSI: 0000000000000001 RDI: 0000000000000000
RBP: ffff888049e36658 R08: ffff8880666ec280 R09: 0000000000000000
R10: fffffbfff134af9f R11: ffff8880666ec280 R12: dffffc0000000000
R13: ffff8880a3e99b00 R14: ffff8880a3e99e98 R15: ffff8880a3e99e90
dequeue_skb net/sched/sch_generic.c:263 [inline]
qdisc_restart net/sched/sch_generic.c:366 [inline]
__qdisc_run+0x1e5/0x1a00 net/sched/sch_generic.c:384
__dev_xmit_skb net/core/dev.c:3533 [inline]
__dev_queue_xmit+0x16f1/0x3650 net/core/dev.c:3838
dev_queue_xmit+0x18/0x20 net/core/dev.c:3902
br_dev_queue_push_xmit+0x3f3/0x5c0 net/bridge/br_forward.c:52
NF_HOOK include/linux/netfilter.h:305 [inline]
NF_HOOK include/linux/netfilter.h:299 [inline]
br_forward_finish+0xfa/0x400 net/bridge/br_forward.c:65
NF_HOOK include/linux/netfilter.h:305 [inline]
NF_HOOK include/linux/netfilter.h:299 [inline]
__br_forward+0x641/0xb00 net/bridge/br_forward.c:109
deliver_clone+0x61/0xc0 net/bridge/br_forward.c:125
maybe_deliver+0x2c7/0x390 net/bridge/br_forward.c:181
br_flood+0x13a/0x3d0 net/bridge/br_forward.c:223
br_dev_xmit+0xd33/0x15a0 net/bridge/br_device.c:84
__netdev_start_xmit include/linux/netdevice.h:4406 [inline]
netdev_start_xmit include/linux/netdevice.h:4420 [inline]
xmit_one net/core/dev.c:3280 [inline]
dev_hard_start_xmit+0x1a3/0x9c0 net/core/dev.c:3296
__dev_queue_xmit+0x2b15/0x3650 net/core/dev.c:3869
dev_queue_xmit+0x18/0x20 net/core/dev.c:3902
neigh_hh_output include/net/neighbour.h:500 [inline]
neigh_output include/net/neighbour.h:509 [inline]
ip_finish_output2+0x1726/0x2570 net/ipv4/ip_output.c:228
__ip_finish_output net/ipv4/ip_output.c:308 [inline]
__ip_finish_output+0x5fc/0xb90 net/ipv4/ip_output.c:290
ip_finish_output+0x38/0x1f0 net/ipv4/ip_output.c:318
NF_HOOK_COND include/linux/netfilter.h:294 [inline]
ip_output+0x21f/0x640 net/ipv4/ip_output.c:432
dst_output include/net/dst.h:436 [inline]
ip_local_out+0xbb/0x190 net/ipv4/ip_output.c:125
__ip_queue_xmit+0x86f/0x1bd0 net/ipv4/ip_output.c:532
sctp_v4_xmit+0x1a8/0x200 net/sctp/protocol.c:976
sctp_packet_transmit+0x1b9f/0x3650 net/sctp/output.c:629
sctp_packet_singleton net/sctp/outqueue.c:772 [inline]
sctp_outq_flush_ctrl.constprop.0+0x73c/0xd30 net/sctp/outqueue.c:903
sctp_outq_flush+0xe8/0x2780 net/sctp/outqueue.c:1185
sctp_outq_uncork+0x6c/0x80 net/sctp/outqueue.c:757
sctp_cmd_interpreter net/sctp/sm_sideeffect.c:1781 [inline]
sctp_side_effects net/sctp/sm_sideeffect.c:1184 [inline]
sctp_do_sm+0x4b9/0x5170 net/sctp/sm_sideeffect.c:1155
sctp_primitive_ASSOCIATE+0x9d/0xd0 net/sctp/primitive.c:73
__sctp_connect+0x8c3/0xcd0 net/sctp/socket.c:1211
__sctp_setsockopt_connectx+0x133/0x1a0 net/sctp/socket.c:1334
sctp_setsockopt_connectx net/sctp/socket.c:1366 [inline]
sctp_setsockopt net/sctp/socket.c:4648 [inline]
sctp_setsockopt+0x2366/0x6d40 net/sctp/socket.c:4605
sock_common_setsockopt+0x94/0xd0 net/core/sock.c:3139
__sys_setsockopt+0x261/0x4c0 net/socket.c:2084
__do_sys_setsockopt net/socket.c:2100 [inline]
__se_sys_setsockopt net/socket.c:2097 [inline]
__x64_sys_setsockopt+0xbe/0x150 net/socket.c:2097
do_syscall_64+0xfd/0x6a0 arch/x86/entry/common.c:296
entry_SYSCALL_64_after_hwframe+0x49/0xbe
RIP: 0033:0x4598e9
Code: fd b7 fb ff c3 66 2e 0f 1f 84 00 00 00 00 00 66 90 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 0f 83 cb b7 fb ff c3 66 2e 0f 1f 84 00 00 00 00
RSP: 002b:00007f4c217bec78 EFLAGS: 00000246 ORIG_RAX: 0000000000000036
RAX: ffffffffffffffda RBX: 0000000000000005 RCX: 00000000004598e9
RDX: 000000000000006e RSI: 0000000000000084 RDI: 0000000000000006
RBP: 000000000075bf20 R08: 0000000000000010 R09: 0000000000000000
R10: 0000000020961fe4 R11: 0000000000000246 R12: 00007f4c217bf6d4
R13: 00000000004cfad0 R14: 00000000004de418 R15: 00000000ffffffff