rcu: INFO: rcu_preempt self-detected stall on CPU
rcu: 	0-...!: (10500 ticks this GP) idle=3b6/1/0x4000000000000000 softirq=30420/30420 fqs=0 
	(t=10500 jiffies g=43669 q=341)
rcu: rcu_preempt kthread starved for 10500 jiffies! g43669 f0x0 RCU_GP_WAIT_FQS(5) ->state=0x0 ->cpu=0
rcu: 	Unless rcu_preempt kthread gets sufficient CPU time, OOM is now expected behavior.
rcu: RCU grace-period kthread stack dump:
task:rcu_preempt     state:R  running task     stack:29168 pid:   14 ppid:     2 flags:0x00004000
Call Trace:
 context_switch kernel/sched/core.c:4322 [inline]
 __schedule+0x911/0x21b0 kernel/sched/core.c:5073
 schedule+0xcf/0x270 kernel/sched/core.c:5152
 schedule_timeout+0x14a/0x250 kernel/time/timer.c:1892
 rcu_gp_fqs_loop kernel/rcu/tree.c:2005 [inline]
 rcu_gp_kthread+0xd07/0x2250 kernel/rcu/tree.c:2178
 kthread+0x3b1/0x4a0 kernel/kthread.c:292
 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:294
rcu: Stack dump where RCU GP kthread last ran:
NMI backtrace for cpu 0
CPU: 0 PID: 16768 Comm: syz-executor.1 Not tainted 5.12.0-rc6-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:79 [inline]
 dump_stack+0x141/0x1d7 lib/dump_stack.c:120
 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_check_gp_kthread_starvation+0x1c7/0x1e4 kernel/rcu/tree_stall.h:478
 print_cpu_stall kernel/rcu/tree_stall.h:620 [inline]
 check_cpu_stall kernel/rcu/tree_stall.h:697 [inline]
 rcu_pending kernel/rcu/tree.c:3830 [inline]
 rcu_sched_clock_irq.cold+0x4f2/0x11dd kernel/rcu/tree.c:2650
 update_process_times+0x16d/0x200 kernel/time/timer.c:1796
 tick_sched_handle+0x9b/0x180 kernel/time/tick-sched.c:226
 tick_sched_timer+0x1b0/0x2d0 kernel/time/tick-sched.c:1369
 __run_hrtimer kernel/time/hrtimer.c:1537 [inline]
 __hrtimer_run_queues+0x1c0/0xe40 kernel/time/hrtimer.c:1601
 hrtimer_interrupt+0x330/0xa00 kernel/time/hrtimer.c:1663
 local_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1089 [inline]
 __sysvec_apic_timer_interrupt+0x146/0x540 arch/x86/kernel/apic/apic.c:1106
 sysvec_apic_timer_interrupt+0x40/0xc0 arch/x86/kernel/apic/apic.c:1100
 asm_sysvec_apic_timer_interrupt+0x12/0x20 arch/x86/include/asm/idtentry.h:632
RIP: 0010:debug_object_init+0xd/0x20 lib/debugobjects.c:615
Code: 24 18 e9 d6 f5 ff ff 4c 89 44 24 18 e8 ac f6 ea fd 4c 8b 44 24 18 e9 9f f5 ff ff 66 90 8b 05 b2 a4 f8 09 85 c0 75 01 c3 31 d2 <e9> de f2 ff ff 66 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 00 8b 05 92
RSP: 0000:ffffc90000007818 EFLAGS: 00000246
RAX: 0000000000000001 RBX: ffff88802e8670c8 RCX: 0000000000000100
RDX: 0000000000000000 RSI: ffffffff896d7fa0 RDI: ffff88802e8670c8
RBP: ffffffff8d80f634 R08: ffffffff901ac380 R09: ffffffff8d80f637
R10: ffffffff8701ff7b R11: 0000000000000000 R12: 0000000000000000
R13: ffffffff87019b40 R14: ffffffff8a665b40 R15: ffffffff901ac380
 debug_timer_init kernel/time/timer.c:722 [inline]
 debug_init kernel/time/timer.c:770 [inline]
 init_timer_key+0x2d/0x340 kernel/time/timer.c:814
 neigh_alloc net/core/neighbour.c:412 [inline]
 ___neigh_create+0x43f/0x25c0 net/core/neighbour.c:578
 ip6_finish_output2+0xf1f/0x1700 net/ipv6/ip6_output.c:114
 __ip6_finish_output net/ipv6/ip6_output.c:182 [inline]
 __ip6_finish_output+0x4c1/0xe10 net/ipv6/ip6_output.c:161
 ip6_finish_output+0x35/0x200 net/ipv6/ip6_output.c:192
 NF_HOOK_COND include/linux/netfilter.h:290 [inline]
 ip6_output+0x1e4/0x530 net/ipv6/ip6_output.c:215
 dst_output include/net/dst.h:448 [inline]
 NF_HOOK include/linux/netfilter.h:301 [inline]
 ndisc_send_skb+0xa99/0x1750 net/ipv6/ndisc.c:508
 ndisc_send_rs+0x12e/0x6f0 net/ipv6/ndisc.c:702
 addrconf_rs_timer+0x3f2/0x820 net/ipv6/addrconf.c:3877
 call_timer_fn+0x1a5/0x6b0 kernel/time/timer.c:1431
 expire_timers kernel/time/timer.c:1476 [inline]
 __run_timers.part.0+0x67c/0xa50 kernel/time/timer.c:1745
 __run_timers kernel/time/timer.c:1726 [inline]
 run_timer_softirq+0xb3/0x1d0 kernel/time/timer.c:1758
 __do_softirq+0x29b/0x9f6 kernel/softirq.c:345
 invoke_softirq kernel/softirq.c:221 [inline]
 __irq_exit_rcu kernel/softirq.c:422 [inline]
 irq_exit_rcu+0x134/0x200 kernel/softirq.c:434
 sysvec_apic_timer_interrupt+0x93/0xc0 arch/x86/kernel/apic/apic.c:1100
 </IRQ>
 asm_sysvec_apic_timer_interrupt+0x12/0x20 arch/x86/include/asm/idtentry.h:632
RIP: 0010:preempt_schedule_irq+0x49/0x90 kernel/sched/core.c:5530
Code: 55 53 65 48 8b 1c 25 00 f0 01 00 48 89 dd 48 c1 ed 03 48 01 c5 bf 01 00 00 00 e8 72 e2 49 f8 e8 3d 8c 75 f8 fb bf 01 00 00 00 <e8> c2 d0 ff ff 9c 58 fa f6 c4 02 75 27 bf 01 00 00 00 e8 b0 d0 49
RSP: 0000:ffffc9000faf7e68 EFLAGS: 00000206
RAX: 0000000000001263 RBX: ffff888027f73880 RCX: 1ffffffff1b89bc9
RDX: 0000000000000000 RSI: 0000000000000001 RDI: 0000000000000001
RBP: ffffed1004fee710 R08: 0000000000000001 R09: 0000000000000001
R10: ffffffff8179e058 R11: 0000000000000001 R12: 0000000000000000
R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000000000
 irqentry_exit_cond_resched kernel/entry/common.c:392 [inline]
 irqentry_exit_cond_resched kernel/entry/common.c:384 [inline]
 irqentry_exit+0x7a/0xa0 kernel/entry/common.c:428
 asm_sysvec_irq_work+0x12/0x20 arch/x86/include/asm/idtentry.h:658
RIP: 0010:exit_to_user_mode_loop kernel/entry/common.c:161 [inline]
RIP: 0010:exit_to_user_mode_prepare+0x10e/0x250 kernel/entry/common.c:208
Code: f6 c4 02 0f 85 0f 01 00 00 65 48 8b 04 25 00 f0 01 00 48 8b 18 f7 c3 0e 30 02 00 0f 84 2f ff ff ff e8 e6 99 17 00 fb f6 c3 08 <74> bf e8 1b 00 a2 07 f6 c7 10 74 ba 48 89 ef e8 2e d6 32 00 f7 c3
RSP: 0000:ffffc9000faf7f30 EFLAGS: 00000202
RAX: 0000000000001261 RBX: 0000000000000008 RCX: 1ffffffff1b89bc9
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000000
RBP: ffffc9000faf7f58 R08: 0000000000000001 R09: 0000000000000001
R10: ffffffff8179e058 R11: 0000000000000001 R12: ffff888027f73880
R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000000000
 irqentry_exit_to_user_mode+0x5/0x40 kernel/entry/common.c:314
 asm_sysvec_apic_timer_interrupt+0x12/0x20 arch/x86/include/asm/idtentry.h:632
RIP: 0033:0x40d773
Code: e8 a2 c9 00 00 c7 00 0e 00 00 00 64 f0 83 04 25 b8 ff ff ff 01 64 48 8b 04 25 00 00 00 00 48 8d b8 f0 fe ff ff e8 5d 2b 01 00 <85> c0 0f 84 6d 01 00 00 64 f0 83 2c 25 b8 ff ff ff 01 e8 66 c9 00
RSP: 002b:00007f4d4b5251a0 EFLAGS: 00000246
RAX: 0000000000000000 RBX: 0000000000000002 RCX: 00000000004c0b25
RDX: 678324135d46931f RSI: 0000000000000000 RDI: 00007f4d4b5255f0
RBP: 00000000004bf9fb R08: 0000000000000000 R09: 00007ffcc1063090
R10: 0000000000011bfa R11: 0000000000000246 R12: 000000000056bf60
R13: 00007ffcc10037df R14: 00007f4d4b525300 R15: 0000000000022000
NMI backtrace for cpu 0
CPU: 0 PID: 16768 Comm: syz-executor.1 Not tainted 5.12.0-rc6-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:79 [inline]
 dump_stack+0x141/0x1d7 lib/dump_stack.c:120
 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+0x222/0x2a7 kernel/rcu/tree_stall.h:341
 print_cpu_stall kernel/rcu/tree_stall.h:622 [inline]
 check_cpu_stall kernel/rcu/tree_stall.h:697 [inline]
 rcu_pending kernel/rcu/tree.c:3830 [inline]
 rcu_sched_clock_irq.cold+0x4f7/0x11dd kernel/rcu/tree.c:2650
 update_process_times+0x16d/0x200 kernel/time/timer.c:1796
 tick_sched_handle+0x9b/0x180 kernel/time/tick-sched.c:226
 tick_sched_timer+0x1b0/0x2d0 kernel/time/tick-sched.c:1369
 __run_hrtimer kernel/time/hrtimer.c:1537 [inline]
 __hrtimer_run_queues+0x1c0/0xe40 kernel/time/hrtimer.c:1601
 hrtimer_interrupt+0x330/0xa00 kernel/time/hrtimer.c:1663
 local_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1089 [inline]
 __sysvec_apic_timer_interrupt+0x146/0x540 arch/x86/kernel/apic/apic.c:1106
 sysvec_apic_timer_interrupt+0x40/0xc0 arch/x86/kernel/apic/apic.c:1100
 asm_sysvec_apic_timer_interrupt+0x12/0x20 arch/x86/include/asm/idtentry.h:632
RIP: 0010:debug_object_init+0xd/0x20 lib/debugobjects.c:615
Code: 24 18 e9 d6 f5 ff ff 4c 89 44 24 18 e8 ac f6 ea fd 4c 8b 44 24 18 e9 9f f5 ff ff 66 90 8b 05 b2 a4 f8 09 85 c0 75 01 c3 31 d2 <e9> de f2 ff ff 66 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 00 8b 05 92
RSP: 0000:ffffc90000007818 EFLAGS: 00000246
RAX: 0000000000000001 RBX: ffff88802e8670c8 RCX: 0000000000000100
RDX: 0000000000000000 RSI: ffffffff896d7fa0 RDI: ffff88802e8670c8
RBP: ffffffff8d80f634 R08: ffffffff901ac380 R09: ffffffff8d80f637
R10: ffffffff8701ff7b R11: 0000000000000000 R12: 0000000000000000
R13: ffffffff87019b40 R14: ffffffff8a665b40 R15: ffffffff901ac380
 debug_timer_init kernel/time/timer.c:722 [inline]
 debug_init kernel/time/timer.c:770 [inline]
 init_timer_key+0x2d/0x340 kernel/time/timer.c:814
 neigh_alloc net/core/neighbour.c:412 [inline]
 ___neigh_create+0x43f/0x25c0 net/core/neighbour.c:578
 ip6_finish_output2+0xf1f/0x1700 net/ipv6/ip6_output.c:114
 __ip6_finish_output net/ipv6/ip6_output.c:182 [inline]
 __ip6_finish_output+0x4c1/0xe10 net/ipv6/ip6_output.c:161
 ip6_finish_output+0x35/0x200 net/ipv6/ip6_output.c:192
 NF_HOOK_COND include/linux/netfilter.h:290 [inline]
 ip6_output+0x1e4/0x530 net/ipv6/ip6_output.c:215
 dst_output include/net/dst.h:448 [inline]
 NF_HOOK include/linux/netfilter.h:301 [inline]
 ndisc_send_skb+0xa99/0x1750 net/ipv6/ndisc.c:508
 ndisc_send_rs+0x12e/0x6f0 net/ipv6/ndisc.c:702
 addrconf_rs_timer+0x3f2/0x820 net/ipv6/addrconf.c:3877
 call_timer_fn+0x1a5/0x6b0 kernel/time/timer.c:1431
 expire_timers kernel/time/timer.c:1476 [inline]
 __run_timers.part.0+0x67c/0xa50 kernel/time/timer.c:1745
 __run_timers kernel/time/timer.c:1726 [inline]
 run_timer_softirq+0xb3/0x1d0 kernel/time/timer.c:1758
 __do_softirq+0x29b/0x9f6 kernel/softirq.c:345
 invoke_softirq kernel/softirq.c:221 [inline]
 __irq_exit_rcu kernel/softirq.c:422 [inline]
 irq_exit_rcu+0x134/0x200 kernel/softirq.c:434
 sysvec_apic_timer_interrupt+0x93/0xc0 arch/x86/kernel/apic/apic.c:1100
 </IRQ>
 asm_sysvec_apic_timer_interrupt+0x12/0x20 arch/x86/include/asm/idtentry.h:632
RIP: 0010:preempt_schedule_irq+0x49/0x90 kernel/sched/core.c:5530
Code: 55 53 65 48 8b 1c 25 00 f0 01 00 48 89 dd 48 c1 ed 03 48 01 c5 bf 01 00 00 00 e8 72 e2 49 f8 e8 3d 8c 75 f8 fb bf 01 00 00 00 <e8> c2 d0 ff ff 9c 58 fa f6 c4 02 75 27 bf 01 00 00 00 e8 b0 d0 49
RSP: 0000:ffffc9000faf7e68 EFLAGS: 00000206
RAX: 0000000000001263 RBX: ffff888027f73880 RCX: 1ffffffff1b89bc9
RDX: 0000000000000000 RSI: 0000000000000001 RDI: 0000000000000001
RBP: ffffed1004fee710 R08: 0000000000000001 R09: 0000000000000001
R10: ffffffff8179e058 R11: 0000000000000001 R12: 0000000000000000
R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000000000
 irqentry_exit_cond_resched kernel/entry/common.c:392 [inline]
 irqentry_exit_cond_resched kernel/entry/common.c:384 [inline]
 irqentry_exit+0x7a/0xa0 kernel/entry/common.c:428
 asm_sysvec_irq_work+0x12/0x20 arch/x86/include/asm/idtentry.h:658
RIP: 0010:exit_to_user_mode_loop kernel/entry/common.c:161 [inline]
RIP: 0010:exit_to_user_mode_prepare+0x10e/0x250 kernel/entry/common.c:208
Code: f6 c4 02 0f 85 0f 01 00 00 65 48 8b 04 25 00 f0 01 00 48 8b 18 f7 c3 0e 30 02 00 0f 84 2f ff ff ff e8 e6 99 17 00 fb f6 c3 08 <74> bf e8 1b 00 a2 07 f6 c7 10 74 ba 48 89 ef e8 2e d6 32 00 f7 c3
RSP: 0000:ffffc9000faf7f30 EFLAGS: 00000202
RAX: 0000000000001261 RBX: 0000000000000008 RCX: 1ffffffff1b89bc9
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000000
RBP: ffffc9000faf7f58 R08: 0000000000000001 R09: 0000000000000001
R10: ffffffff8179e058 R11: 0000000000000001 R12: ffff888027f73880
R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000000000
 irqentry_exit_to_user_mode+0x5/0x40 kernel/entry/common.c:314
 asm_sysvec_apic_timer_interrupt+0x12/0x20 arch/x86/include/asm/idtentry.h:632
RIP: 0033:0x40d773
Code: e8 a2 c9 00 00 c7 00 0e 00 00 00 64 f0 83 04 25 b8 ff ff ff 01 64 48 8b 04 25 00 00 00 00 48 8d b8 f0 fe ff ff e8 5d 2b 01 00 <85> c0 0f 84 6d 01 00 00 64 f0 83 2c 25 b8 ff ff ff 01 e8 66 c9 00
RSP: 002b:00007f4d4b5251a0 EFLAGS: 00000246
RAX: 0000000000000000 RBX: 0000000000000002 RCX: 00000000004c0b25
RDX: 678324135d46931f RSI: 0000000000000000 RDI: 00007f4d4b5255f0
RBP: 00000000004bf9fb R08: 0000000000000000 R09: 00007ffcc1063090
R10: 0000000000011bfa R11: 0000000000000246 R12: 000000000056bf60
R13: 00007ffcc10037df R14: 00007f4d4b525300 R15: 0000000000022000