rcu: INFO: rcu_preempt self-detected stall on CPU
rcu: 1-...!: (10499 ticks this GP) idle=70e/1/0x4000000000000004 softirq=171457/171457 fqs=4
rcu: (t=10500 jiffies g=176801 q=339)
rcu: rcu_preempt kthread starved for 10492 jiffies! g176801 f0x0 RCU_GP_WAIT_FQS(5) ->state=0x0 ->cpu=0
rcu: RCU grace-period kthread stack dump:
rcu_preempt R running task 29104 10 2 0x80000000
Call Trace:
context_switch kernel/sched/core.c:2826 [inline]
__schedule+0x8a2/0x1fc0 kernel/sched/core.c:3515
schedule+0x8d/0x1b0 kernel/sched/core.c:3559
schedule_timeout+0x4c1/0xed0 kernel/time/timer.c:1806
rcu_gp_kthread+0xf94/0x2050 kernel/rcu/tree.c:2202
kthread+0x30b/0x410 kernel/kthread.c:246
ret_from_fork+0x24/0x30 arch/x86/entry/entry_64.S:415
NMI backtrace for cpu 1
CPU: 1 PID: 32051 Comm: syz-executor.4 Not tainted 4.19.128-syzkaller #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+0x1fc/0x2fe lib/dump_stack.c:118
nmi_cpu_backtrace.cold+0x63/0xa2 lib/nmi_backtrace.c:101
nmi_trigger_cpumask_backtrace+0x1a6/0x1eb lib/nmi_backtrace.c:62
trigger_single_cpu_backtrace include/linux/nmi.h:164 [inline]
rcu_dump_cpu_stacks+0x170/0x1bb kernel/rcu/tree.c:1340
print_cpu_stall kernel/rcu/tree.c:1478 [inline]
check_cpu_stall kernel/rcu/tree.c:1550 [inline]
__rcu_pending kernel/rcu/tree.c:3293 [inline]
rcu_pending kernel/rcu/tree.c:3336 [inline]
rcu_check_callbacks.cold+0x634/0xddc kernel/rcu/tree.c:2682
update_process_times+0x2a/0x70 kernel/time/timer.c:1638
tick_sched_handle.isra.0+0x91/0x180 kernel/time/tick-sched.c:168
tick_sched_timer+0x44/0x130 kernel/time/tick-sched.c:1278
__run_hrtimer kernel/time/hrtimer.c:1401 [inline]
__hrtimer_run_queues+0x2ec/0xd20 kernel/time/hrtimer.c:1463
hrtimer_interrupt+0x312/0x770 kernel/time/hrtimer.c:1521
local_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1067 [inline]
smp_apic_timer_interrupt+0x10c/0x550 arch/x86/kernel/apic/apic.c:1092
apic_timer_interrupt+0xf/0x20 arch/x86/entry/entry_64.S:894
RIP: 0010:fib6_age+0x50/0x160 net/ipv6/ip6_fib.c:2094
Code: 80 3c 10 00 0f 85 11 01 00 00 48 8d 7d 54 4c 8b 2d 45 f7 71 02 48 b8 00 00 00 00 00 fc ff df 48 89 fa 48 c1 ea 03 0f b6 14 02 <48> 89 f8 83 e0 07 83 c0 03 38 d0 7c 08 84 d2 0f 85 c3 00 00 00 8b
RSP: 0018:ffff8880ae707600 EFLAGS: 00000a03 ORIG_RAX: ffffffffffffff13
RAX: dffffc0000000000 RBX: ffffffff862e9880 RCX: 1ffffffff11f8958
RDX: 0000000000000000 RSI: ffffffff862e9891 RDI: ffff888031f300d4
RBP: ffff888031f30080 R08: ffff888020a4a0c0 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000000 R12: ffff8880ae707900
R13: 00000001000370f9 R14: ffffed1015ce0f01 R15: ffffed1015ce0eff
fib6_clean_node+0x263/0x510 net/ipv6/ip6_fib.c:1992
fib6_walk_continue+0x4fa/0x8b0 net/ipv6/ip6_fib.c:1918
fib6_walk+0x91/0xf0 net/ipv6/ip6_fib.c:1966
fib6_clean_tree+0xc2/0x100 net/ipv6/ip6_fib.c:2043
__fib6_clean_all+0x10d/0x290 net/ipv6/ip6_fib.c:2059
fib6_clean_all net/ipv6/ip6_fib.c:2070 [inline]
fib6_run_gc+0x110/0x2d0 net/ipv6/ip6_fib.c:2126
ip6_dst_gc+0x1fd/0x380 net/ipv6/route.c:2775
dst_alloc+0x147/0x190 net/core/dst.c:101
ip6_dst_alloc+0x2e/0x90 net/ipv6/route.c:357
icmp6_dst_alloc+0x1ab/0x660 net/ipv6/route.c:2731
ndisc_send_skb+0x10b3/0x1710 net/ipv6/ndisc.c:471
ndisc_send_rs+0x131/0x690 net/ipv6/ndisc.c:685
addrconf_rs_timer+0x306/0x680 net/ipv6/addrconf.c:3834
call_timer_fn+0x177/0x700 kernel/time/timer.c:1326
expire_timers+0x24f/0x4f0 kernel/time/timer.c:1363
__run_timers kernel/time/timer.c:1684 [inline]
run_timer_softirq+0x218/0x660 kernel/time/timer.c:1697
__do_softirq+0x26c/0x93d kernel/softirq.c:292
invoke_softirq kernel/softirq.c:372 [inline]
irq_exit+0x17b/0x1c0 kernel/softirq.c:412
exiting_irq arch/x86/include/asm/apic.h:544 [inline]
smp_apic_timer_interrupt+0x136/0x550 arch/x86/kernel/apic/apic.c:1094
apic_timer_interrupt+0xf/0x20 arch/x86/entry/entry_64.S:894
RIP: 0010:__read_once_size include/linux/compiler.h:193 [inline]
RIP: 0010:batadv_hardif_get_by_netdev+0x115/0x3e0 net/batman-adv/hard-interface.c:82
Code: 4c 8b 25 de 4f 2b 05 49 81 fc a0 ab 2c 8c 0f 84 d0 01 00 00 48 8d 44 24 30 48 bb 00 00 00 00 00 fc ff df 48 89 44 24 08 eb 27 d6 3e 66 fa 4c 89 e0 48 c1 e8 03 80 3c 18 00 0f 85 78 02 00 00
RSP: 0018:ffff888218ec6fe0 EFLAGS: 00000206 ORIG_RAX: ffffffffffffff13
RAX: 1ffff110119d5524 RBX: dffffc0000000000 RCX: ffffc9000e50f000
RDX: 000000000001a5af RSI: ffffffff87015c11 RDI: ffff88808ceaa920
RBP: ffff8880157c0040 R08: ffff888020a4a0c0 R09: ffffed1015ce473b
R10: ffffed1015ce473a R11: ffff8880ae7239d3 R12: ffff88808ceaa900
R13: 0000000000000000 R14: 0000000000000000 R15: ffffffff898239e0
batadv_hard_if_event+0x10a/0x15d0 net/batman-adv/hard-interface.c:1035
notifier_call_chain+0xc0/0x230 kernel/notifier.c:93
call_netdevice_notifiers net/core/dev.c:1766 [inline]
__dev_close_many+0xee/0x2e0 net/core/dev.c:1463
dev_close_many+0x238/0x650 net/core/dev.c:1514
rollback_registered_many+0x2d6/0xc40 net/core/dev.c:8170
unregister_netdevice_many.part.0+0x16/0x1e0 net/core/dev.c:9309
unregister_netdevice_many+0x36/0x50 net/core/dev.c:9308
rtnl_delete_link+0xdb/0x130 net/core/rtnetlink.c:2760
rtnl_dellink+0x373/0x8b0 net/core/rtnetlink.c:2814
rtnetlink_rcv_msg+0x453/0xb80 net/core/rtnetlink.c:4777
netlink_rcv_skb+0x160/0x410 net/netlink/af_netlink.c:2455
netlink_unicast_kernel net/netlink/af_netlink.c:1318 [inline]
netlink_unicast+0x4d7/0x6a0 net/netlink/af_netlink.c:1344
netlink_sendmsg+0x6e3/0xcc0 net/netlink/af_netlink.c:1909
sock_sendmsg_nosec net/socket.c:622 [inline]
sock_sendmsg+0xc3/0x120 net/socket.c:632
___sys_sendmsg+0x803/0x920 net/socket.c:2115
__sys_sendmsg+0xec/0x1b0 net/socket.c:2153
do_syscall_64+0xf9/0x620 arch/x86/entry/common.c:293
entry_SYSCALL_64_after_hwframe+0x49/0xbe
RIP: 0033:0x45ca59
Code: 0d 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 db b6 fb ff c3 66 2e 0f 1f 84 00 00 00 00
RSP: 002b:00007fa583081c78 EFLAGS: 00000246 ORIG_RAX: 000000000000002e
RAX: ffffffffffffffda RBX: 0000000000501c60 RCX: 000000000045ca59
RDX: 0000000000000000 RSI: 0000000020000140 RDI: 0000000000000003
RBP: 000000000078bfa0 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 00000000ffffffff
R13: 0000000000000a27 R14: 00000000004cd0a8 R15: 00007fa5830826d4