rcu: INFO: rcu_preempt self-detected stall on CPU
rcu: 	0-....: (10317 ticks this GP) idle=b96/1/0x4000000000000000 softirq=15919/15921 fqs=5241 
	(t=10502 jiffies g=19677 q=887)
NMI backtrace for cpu 0
CPU: 0 PID: 12103 Comm: syz-executor.1 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:preempt_count arch/x86/include/asm/preempt.h:26 [inline]
RIP: 0010:check_kcov_mode kernel/kcov.c:163 [inline]
RIP: 0010:__sanitizer_cov_trace_pc+0x9/0x60 kernel/kcov.c:197
Code: 8b 48 89 54 24 08 48 89 34 24 e8 72 b3 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
RSP: 0018:ffffc90000007678 EFLAGS: 00000202
RAX: 0000000000000000 RBX: ffff888028a93800 RCX: ffffffff87a6daea
RDX: ffff888071efb480 RSI: ffff888071efb480 RDI: 0000000000000005
RBP: dffffc0000000000 R08: 0000000000000001 R09: ffffc90000007850
R10: 0000000000000000 R11: 0000000000000001 R12: 0000000000000001
R13: ffffc90000007968 R14: 0000000000000000 R15: ffff88802180f4a0
 __find_rr_leaf+0x2b4/0xd10 net/ipv6/route.c:804
 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_rcv_finish net/ipv6/ip6_input.c:74 [inline]
 NF_HOOK include/linux/netfilter.h:301 [inline]
 NF_HOOK include/linux/netfilter.h:295 [inline]
 ipv6_rcv+0x22b/0x3c0 net/ipv6/ip6_input.c:307
 __netif_receive_skb_one_core+0x114/0x180 net/core/dev.c:5311
 __netif_receive_skb+0x27/0x1c0 net/core/dev.c:5425
 process_backlog+0x232/0x6c0 net/core/dev.c:6315
 napi_poll net/core/dev.c:6759 [inline]
 net_rx_action+0x4dc/0x1100 net/core/dev.c:6829
 __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_apic_timer_interrupt+0x4d/0x100 arch/x86/kernel/apic/apic.c:1091
 asm_sysvec_apic_timer_interrupt+0x12/0x20 arch/x86/include/asm/idtentry.h:631
RIP: 0010:schedule_debug kernel/sched/core.c:4278 [inline]
RIP: 0010:__schedule+0x139/0x2130 kernel/sched/core.c:4423
Code: 7d 1a 00 00 48 ba 00 00 00 00 00 fc ff df 49 8b 45 18 48 89 c1 48 c1 e9 03 80 3c 11 00 0f 85 43 1a 00 00 48 81 38 9d 6e ac 57 <0f> 85 c5 1f 00 00 49 8d 45 10 84 db 48 89 85 68 ff ff ff 75 28 48
RSP: 0018:ffffc9000282fab0 EFLAGS: 00000246
RAX: ffffc90002828000 RBX: 0000000000000001 RCX: 1ffff92000505000
RDX: dffffc0000000000 RSI: 0000000000000001 RDI: ffff888071efb498
RBP: ffffc9000282fb78 R08: 0000000000000001 R09: 0000000000000001
R10: 0000000000000000 R11: 0000000000000001 R12: ffff8880b9e34940
R13: ffff888071efb480 R14: ffff8880b9e34940 R15: 0000000000034940
 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:do_futex+0x325/0x1a60 kernel/futex.c:3770
Code: bd ff ff ff ff c7 84 24 e8 00 00 00 ff ff ff ff e8 40 7e 0b 00 8b 14 24 44 89 e9 4c 89 e7 8b 74 24 10 e8 6e ac ff ff 4c 63 f8 <e9> 34 fe ff ff e8 21 7e 0b 00 45 31 c9 6a 00 44 8b 44 24 28 4c 89
RSP: 0018:ffffc9000282fc58 EFLAGS: 00000292
RAX: 0000000000000001 RBX: 0000000000000000 RCX: ffffc9000bd45000
RDX: 0000000000040000 RSI: ffffffff81643405 RDI: ffff888022adb4a0
RBP: 0000000000000001 R08: 0000000000000001 R09: ffff888022adb4a3
R10: ffffed100455b694 R11: 0000000000000001 R12: 000000000119c184
R13: 00000000ffffffff R14: 0000000000000080 R15: 0000000000000001
 __do_sys_futex+0x2a2/0x470 kernel/futex.c:3828
 do_syscall_64+0x2d/0x70 arch/x86/entry/common.c:46
 entry_SYSCALL_64_after_hwframe+0x44/0xa9
RIP: 0033:0x45e159
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:00007fc9aded6cf8 EFLAGS: 00000246 ORIG_RAX: 00000000000000ca
RAX: ffffffffffffffda RBX: 000000000119c180 RCX: 000000000045e159
RDX: 00000000000f4240 RSI: 0000000000000081 RDI: 000000000119c184
RBP: 000000000119c178 R08: 0000000000000009 R09: 0000000000000000
R10: ffffffffffffffff R11: 0000000000000246 R12: 000000000119c184
R13: 00007ffc6254b70f R14: 00007fc9aded79c0 R15: 000000000119c184