rcu: INFO: rcu_preempt self-detected stall on CPU rcu: 1-....: (10420 ticks this GP) idle=766/1/0x4000000000000000 softirq=35042/35047 fqs=5238 (t=10502 jiffies g=48597 q=2039) NMI backtrace for cpu 1 CPU: 1 PID: 17966 Comm: syz-executor.4 Not tainted 5.10.0-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 Call Trace: __dump_stack lib/dump_stack.c:79 [inline] dump_stack+0x107/0x163 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+0x1e3/0x21e kernel/rcu/tree_stall.h:337 print_cpu_stall kernel/rcu/tree_stall.h:569 [inline] check_cpu_stall kernel/rcu/tree_stall.h:643 [inline] rcu_pending kernel/rcu/tree.c:3751 [inline] rcu_sched_clock_irq.cold+0x472/0xec3 kernel/rcu/tree.c:2580 update_process_times+0x16d/0x200 kernel/time/timer.c:1782 tick_sched_handle+0x9b/0x180 kernel/time/tick-sched.c:226 tick_sched_timer+0x1b0/0x2d0 kernel/time/tick-sched.c:1376 __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:1085 [inline] __sysvec_apic_timer_interrupt+0x146/0x540 arch/x86/kernel/apic/apic.c:1102 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:1096 asm_sysvec_apic_timer_interrupt+0x12/0x20 arch/x86/include/asm/idtentry.h:628 RIP: 0010:ndisc_hashfn include/net/ndisc.h:376 [inline] RIP: 0010:___neigh_lookup_noref.constprop.0+0xe7/0x770 include/net/neighbour.h:294 Code: c1 ea 03 4d 31 ec 44 33 65 00 0f b6 14 02 48 89 f8 83 e0 07 83 c0 03 38 d0 7c 08 84 d2 0f 85 75 06 00 00 4c 8d 7d 04 8b 43 0c <48> ba 00 00 00 00 00 fc ff df 4c 89 f9 48 c1 e9 03 0f b6 0c 11 4c RSP: 0018:ffffc90000d908f0 EFLAGS: 00000246 RAX: 00000000dc7a07ab RBX: ffff888019690900 RCX: ffffffff87a150db RDX: 0000000000000000 RSI: ffffffff87a14b7a RDI: ffff88801969090c RBP: ffff88807612e428 R08: 0000000000000000 R09: ffffffff8ebb07c7 R10: 0000000000000000 R11: 0000000000000001 R12: 00000000d17aca7f R13: ffff88802e854000 R14: ffff88807612e428 R15: ffff88807612e42c __ipv6_neigh_lookup_noref include/net/ndisc.h:383 [inline] ip6_finish_output2+0x2ed/0x16c0 net/ipv6/ip6_output.c:112 __ip6_finish_output net/ipv6/ip6_output.c:143 [inline] __ip6_finish_output+0x447/0xab0 net/ipv6/ip6_output.c:128 ip6_finish_output+0x34/0x1f0 net/ipv6/ip6_output.c:153 NF_HOOK_COND include/linux/netfilter.h:290 [inline] ip6_output+0x1db/0x520 net/ipv6/ip6_output.c:176 dst_output include/net/dst.h:443 [inline] NF_HOOK include/linux/netfilter.h:301 [inline] ndisc_send_skb+0xa69/0x1720 net/ipv6/ndisc.c:508 ndisc_send_rs+0x12e/0x700 net/ipv6/ndisc.c:702 addrconf_rs_timer+0x3f2/0x820 net/ipv6/addrconf.c:3873 call_timer_fn+0x1a5/0x6b0 kernel/time/timer.c:1417 expire_timers kernel/time/timer.c:1462 [inline] __run_timers.part.0+0x67c/0xa50 kernel/time/timer.c:1731 __run_timers kernel/time/timer.c:1712 [inline] run_timer_softirq+0xb3/0x1d0 kernel/time/timer.c:1744 __do_softirq+0x2a0/0x9f6 kernel/softirq.c:298 asm_call_irq_on_stack+0xf/0x20 __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:1096 asm_sysvec_apic_timer_interrupt+0x12/0x20 arch/x86/include/asm/idtentry.h:628 RIP: 0010:tlb_next_batch mm/mmu_gather.c:34 [inline] RIP: 0010:__tlb_remove_page_size+0x2b4/0x420 mm/mmu_gather.c:83 Code: e0 07 83 c0 03 38 d0 7c 08 84 d2 0f 85 40 01 00 00 48 b8 00 00 00 00 00 fc ff df 4c 89 e2 83 43 24 01 48 c1 ea 03 80 3c 02 00 <0f> 85 2e 01 00 00 49 8d 7c 24 08 49 c7 04 24 00 00 00 00 48 b8 00 RSP: 0018:ffffc90001b4f768 EFLAGS: 00000246 RAX: dffffc0000000000 RBX: ffffc90001b4fa68 RCX: ffffffff81a524b0 RDX: 1ffff1100e198800 RSI: ffffffff81a524be RDI: 0000000000000007 RBP: ffff888070cc4000 R08: 0000000000000000 R09: ffffffff8ceca28f R10: 0000000000000000 R11: 0000000000000000 R12: ffff888070cc4000 R13: ffffc90001b4fa8c R14: ffffea0001fe3880 R15: ffffc90001b4fa90 __tlb_remove_page include/asm-generic/tlb.h:438 [inline] zap_pte_range mm/memory.c:1256 [inline] zap_pmd_range mm/memory.c:1357 [inline] zap_pud_range mm/memory.c:1386 [inline] zap_p4d_range mm/memory.c:1407 [inline] unmap_page_range+0xea7/0x2640 mm/memory.c:1428 unmap_single_vma+0x198/0x300 mm/memory.c:1473 unmap_vmas+0x168/0x2e0 mm/memory.c:1505 exit_mmap+0x2b1/0x530 mm/mmap.c:3220 __mmput+0x122/0x470 kernel/fork.c:1081 mmput+0x53/0x60 kernel/fork.c:1102 exit_mm kernel/exit.c:500 [inline] do_exit+0xaa9/0x29f0 kernel/exit.c:810 do_group_exit+0x125/0x310 kernel/exit.c:920 get_signal+0x42a/0x1fb0 kernel/signal.c:2792 arch_do_signal_or_restart+0x2a8/0x1eb0 arch/x86/kernel/signal.c:811 handle_signal_work kernel/entry/common.c:147 [inline] exit_to_user_mode_loop kernel/entry/common.c:171 [inline] exit_to_user_mode_prepare+0x124/0x200 kernel/entry/common.c:201 irqentry_exit_to_user_mode+0x5/0x30 kernel/entry/common.c:315 asm_sysvec_irq_work+0x12/0x20 arch/x86/include/asm/idtentry.h:654 RIP: 0033:0x45e159 Code: Unable to access opcode bytes at RIP 0x45e12f. RSP: 002b:00007f1779d48cf8 EFLAGS: 00000246 RAX: 0000000000000000 RBX: 000000000119bf88 RCX: 000000000045e159 RDX: 0000000000000000 RSI: 0000000000000080 RDI: 000000000119bf88 RBP: 000000000119bf80 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 000000000119bf8c R13: 00007fffa2c1948f R14: 00007f1779d499c0 R15: 000000000119bf8c