rcu: INFO: rcu_preempt self-detected stall on CPU
rcu: 	1-....: (8536 ticks this GP) idle=56e/1/0x4000000000000000 softirq=18864/18866 fqs=4627 
	(t=10500 jiffies g=22269 q=1382)
NMI backtrace for cpu 1
CPU: 1 PID: 12519 Comm: syz-executor.4 Not tainted 5.10.0-rc7-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
Call Trace:
 <IRQ>
 __dump_stack lib/dump_stack.c:77 [inline]
 dump_stack+0x107/0x163 lib/dump_stack.c:118
 nmi_cpu_backtrace.cold+0x44/0xd7 lib/nmi_backtrace.c:105
 nmi_trigger_cpumask_backtrace+0x1b3/0x230 lib/nmi_backtrace.c:62
 trigger_single_cpu_backtrace include/linux/nmi.h:164 [inline]
 rcu_dump_cpu_stacks+0x1e3/0x21e kernel/rcu/tree_stall.h:331
 print_cpu_stall kernel/rcu/tree_stall.h:563 [inline]
 check_cpu_stall kernel/rcu/tree_stall.h:637 [inline]
 rcu_pending kernel/rcu/tree.c:3694 [inline]
 rcu_sched_clock_irq.cold+0x472/0xee8 kernel/rcu/tree.c:2567
 update_process_times+0x77/0xd0 kernel/time/timer.c:1709
 tick_sched_handle+0x9b/0x180 kernel/time/tick-sched.c:176
 tick_sched_timer+0x1d1/0x2a0 kernel/time/tick-sched.c:1328
 __run_hrtimer kernel/time/hrtimer.c:1519 [inline]
 __hrtimer_run_queues+0x1ce/0xea0 kernel/time/hrtimer.c:1583
 hrtimer_interrupt+0x334/0x940 kernel/time/hrtimer.c:1645
 local_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1080 [inline]
 __sysvec_apic_timer_interrupt+0x146/0x540 arch/x86/kernel/apic/apic.c:1097
 run_sysvec_on_irqstack_cond arch/x86/include/asm/irq_stack.h:91 [inline]
 sysvec_apic_timer_interrupt+0x48/0x100 arch/x86/kernel/apic/apic.c:1091
 asm_sysvec_apic_timer_interrupt+0x12/0x20 arch/x86/include/asm/idtentry.h:631
RIP: 0010:__find_rr_leaf+0x303/0xd10 net/ipv6/route.c:810
Code: e8 42 2f c9 f9 48 8d bb 80 00 00 00 48 89 f8 48 c1 e8 03 0f b6 04 28 84 c0 74 08 3c 03 0f 8e d2 07 00 00 44 8b a3 80 00 00 00 <44> 8b 74 24 10 44 89 e7 44 89 f6 e8 dd 26 c9 f9 45 39 f4 0f 85 fa
RSP: 0018:ffffc90000d90380 EFLAGS: 00000246
RAX: 0000000000000000 RBX: ffff88801b7bf800 RCX: ffffffff87a6d61a
RDX: ffff888068c33480 RSI: ffffffff87a6d52e RDI: ffff88801b7bf880
RBP: dffffc0000000000 R08: 0000000000000001 R09: ffffc90000d90550
R10: 0000000000000000 R11: 0000000000000001 R12: 0000000000000100
R13: ffffc90000d90668 R14: 0000000000000000 R15: ffff88801b7bf2a0
 find_rr_leaf net/ipv6/route.c:862 [inline]
 rt6_select net/ipv6/route.c:906 [inline]
 fib6_table_lookup+0x5b3/0xa20 net/ipv6/route.c:2193
 ip6_pol_route+0x1e1/0x11c0 net/ipv6/route.c:2229
 pol_lookup_func include/net/ip6_fib.h:583 [inline]
 fib6_rule_lookup+0x111/0x6f0 net/ipv6/fib6_rules.c:115
 ip6_route_input_lookup net/ipv6/route.c:2299 [inline]
 ip6_route_input+0x68a/0xae0 net/ipv6/route.c:2468
 ip6_rcv_finish_core.constprop.0.isra.0+0x168/0x570 net/ipv6/ip6_input.c:63
 ip6_list_rcv_finish.constprop.0+0x233/0xb00 net/ipv6/ip6_input.c:127
 ip6_sublist_rcv net/ipv6/ip6_input.c:317 [inline]
 ipv6_list_rcv+0x350/0x490 net/ipv6/ip6_input.c:352
 __netif_receive_skb_list_ptype net/core/dev.c:5354 [inline]
 __netif_receive_skb_list_core+0x549/0x8e0 net/core/dev.c:5402
 __netif_receive_skb_list net/core/dev.c:5454 [inline]
 netif_receive_skb_list_internal+0x777/0xd70 net/core/dev.c:5564
 netif_receive_skb_list+0x54/0x5b0 net/core/dev.c:5616
 ieee80211_rx_napi+0x344/0x3d0 net/mac80211/rx.c:4784
 ieee80211_rx include/net/mac80211.h:4502 [inline]
 ieee80211_tasklet_handler+0xd3/0x130 net/mac80211/main.c:235
 tasklet_action_common.constprop.0+0x22f/0x2d0 kernel/softirq.c:560
 __do_softirq+0x2a0/0x9f6 kernel/softirq.c:298
 asm_call_irq_on_stack+0xf/0x20
 </IRQ>
 __run_on_irqstack arch/x86/include/asm/irq_stack.h:26 [inline]
 run_on_irqstack_cond arch/x86/include/asm/irq_stack.h:77 [inline]
 do_softirq_own_stack+0xaa/0xd0 arch/x86/kernel/irq_64.c:77
 invoke_softirq kernel/softirq.c:393 [inline]
 __irq_exit_rcu kernel/softirq.c:423 [inline]
 irq_exit_rcu+0x132/0x200 kernel/softirq.c:435
 sysvec_irq_work+0x4d/0x100 arch/x86/kernel/irq_work.c:17
 asm_sysvec_irq_work+0x12/0x20 arch/x86/include/asm/idtentry.h:657
RIP: 0010:call_rcu+0x2e7/0x700 kernel/rcu/tree.c:3028
Code: 3c 02 00 0f 85 bb 03 00 00 48 8b 05 63 98 d6 09 49 03 84 24 f0 00 00 00 49 39 c7 0f 8f 65 01 00 00 e8 5d 63 18 00 ff 34 24 9d <48> 83 c4 20 5b 5d 41 5c 41 5d 41 5e 41 5f c3 80 3c 02 00 0f 84 2f
RSP: 0018:ffffc90001c87c88 EFLAGS: 00000246
RAX: 0000000000e56f99 RBX: ffff888021c04848 RCX: 1ffffffff19d8e89
RDX: 0000000000000000 RSI: 0000000000000001 RDI: 0000000000000000
RBP: ffff8880b9f35830 R08: 0000000000000001 R09: 0000000000000001
R10: 0000000000000000 R11: 0000000000000001 R12: ffff8880b9f35740
R13: ffff8880b9f35820 R14: ffff8880b9f357d8 R15: 0000000000000025
 put_task_struct_rcu_user+0x7f/0xb0 kernel/exit.c:178
 finish_task_switch+0x548/0x7a0 kernel/sched/core.c:3652
 context_switch kernel/sched/core.c:3782 [inline]
 __schedule+0x89b/0x2130 kernel/sched/core.c:4528
 preempt_schedule_irq+0x4e/0x90 kernel/sched/core.c:4789
 irqentry_exit_cond_resched kernel/entry/common.c:357 [inline]
 irqentry_exit_cond_resched kernel/entry/common.c:349 [inline]
 irqentry_exit+0x7a/0xa0 kernel/entry/common.c:387
 asm_sysvec_apic_timer_interrupt+0x12/0x20 arch/x86/include/asm/idtentry.h:631
RIP: 0010:check_kcov_mode kernel/kcov.c:163 [inline]
RIP: 0010:__sanitizer_cov_trace_pc+0x10/0x60 kernel/kcov.c:197
Code: 89 34 24 e8 b2 ac 5e 02 48 8b 54 24 08 48 8b 34 24 e9 a1 fd ff ff 0f 1f 40 00 65 48 8b 14 25 00 f0 01 00 65 8b 05 40 eb 91 7e <a9> 00 01 ff 00 48 8b 34 24 74 0f f6 c4 01 74 35 8b 82 5c 14 00 00
RSP: 0018:ffffc90001c87ef8 EFLAGS: 00000212
RAX: 0000000080000000 RBX: 0000000000000001 RCX: ffffc9001190f000
RDX: ffff888068c33480 RSI: ffffffff81c0d545 RDI: ffff888019ad9180
RBP: ffff888019ad9180 R08: 0000000000000000 R09: ffff888019ad91b3
R10: 0000000000000000 R11: 0000000000000000 R12: 0000000000000000
R13: 0000000000000004 R14: 0000000000042000 R15: 0000000000000003
 fput+0x9/0x20 fs/file_table.c:358
 fdput include/linux/file.h:46 [inline]
 __do_sys_fcntl fs/fcntl.c:466 [inline]
 __se_sys_fcntl fs/fcntl.c:448 [inline]
 __x64_sys_fcntl+0x14d/0x1e0 fs/fcntl.c:448
 do_syscall_64+0x2d/0x70 arch/x86/entry/common.c:46
 entry_SYSCALL_64_after_hwframe+0x44/0xa9
RIP: 0033:0x45e0f9
Code: 0d b4 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 b3 fb ff c3 66 2e 0f 1f 84 00 00 00 00
RSP: 002b:00007fdbdbeb5c68 EFLAGS: 00000246 ORIG_RAX: 0000000000000048
RAX: ffffffffffffffda RBX: 0000000000000003 RCX: 000000000045e0f9
RDX: 0000000000042000 RSI: 0000000000000004 RDI: 0000000000000003
RBP: 000000000119bfc0 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 000000000119bf8c
R13: 00007ffd4eceeb1f R14: 00007fdbdbeb69c0 R15: 000000000119bf8c