rcu: INFO: rcu_preempt self-detected stall on CPU rcu: 0-....: (9791 ticks this GP) idle=d3a/1/0x4000000000000000 softirq=13644/13646 fqs=5095 (t=10502 jiffies g=16621 q=737) NMI backtrace for cpu 0 CPU: 0 PID: 10742 Comm: syz-executor.0 Not tainted 5.11.0-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+0xfa/0x151 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:1519 [inline] __hrtimer_run_queues+0x1c0/0xe40 kernel/time/hrtimer.c:1583 hrtimer_interrupt+0x334/0x940 kernel/time/hrtimer.c:1645 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 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:1100 asm_sysvec_apic_timer_interrupt+0x12/0x20 arch/x86/include/asm/idtentry.h:635 RIP: 0010:ipv6_skip_exthdr+0x2/0x540 net/ipv6/exthdrs_core.c:74 Code: 45 fe ff ff e8 7f 6b ea f9 e9 c6 fe ff ff e8 a5 6b ea f9 e9 f9 fd ff ff e8 8b 6b ea f9 e9 5a fe ff ff 66 0f 1f 44 00 00 41 57 <41> 56 49 89 d6 41 55 41 89 f5 41 54 55 48 89 fd 53 48 bb 00 00 00 RSP: 0018:ffffc900000077f8 EFLAGS: 00000246 RAX: 0000000000000000 RBX: 1ffff92000000f02 RCX: ffffc90000007840 RDX: ffffc90000007830 RSI: 0000000000000028 RDI: ffff88801ccea140 RBP: ffff88801ccea140 R08: 0000000000000000 R09: 0000000000000000 R10: ffffffff873cc278 R11: 000000000000000a R12: ffffc90000007990 R13: 0000000000000000 R14: 0000000000000028 R15: dffffc0000000000 ipv6_get_l4proto net/netfilter/nf_conntrack_core.c:364 [inline] get_l4proto+0x33b/0x530 net/netfilter/nf_conntrack_core.c:387 nf_conntrack_in+0x25e/0x1330 net/netfilter/nf_conntrack_core.c:1810 nf_hook_entry_hookfn include/linux/netfilter.h:136 [inline] nf_hook_slow+0xc5/0x1e0 net/netfilter/core.c:589 nf_hook include/linux/netfilter.h:256 [inline] NF_HOOK include/linux/netfilter.h:299 [inline] ndisc_send_skb+0xbc2/0x1750 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:343 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:226 [inline] __irq_exit_rcu kernel/softirq.c:420 [inline] irq_exit_rcu+0x134/0x200 kernel/softirq.c:432 sysvec_apic_timer_interrupt+0x4d/0x100 arch/x86/kernel/apic/apic.c:1100 asm_sysvec_apic_timer_interrupt+0x12/0x20 arch/x86/include/asm/idtentry.h:635 RIP: 0010:check_preemption_disabled+0x3e/0x150 lib/smp_processor_id.c:60 Code: 44 8b 25 dd 2a 00 77 65 8b 1d 2e 85 00 77 81 e3 ff ff ff 7f 31 ff 89 de 0f 1f 44 00 00 85 db 74 11 0f 1f 44 00 00 44 89 e0 5b <5d> 41 5c 41 5d 41 5e c3 0f 1f 44 00 00 9c 5b 81 e3 00 02 00 00 31 RSP: 0018:ffffc9000290f468 EFLAGS: 00000202 RAX: 0000000000000000 RBX: 0000000000000001 RCX: 1ffff92000521e9a RDX: 0000000000000000 RSI: 0000000000000001 RDI: 0000000000000000 RBP: ffffffff89bf15e0 R08: 0000000000000001 R09: 0000000000000001 R10: ffffffff81793e38 R11: 0000000000000001 R12: 0000000000000000 R13: ffffffff89bf15a0 R14: 0000000000035180 R15: 0000000000000000 __schedule+0x7e/0x21a0 kernel/sched/core.c:4965 preempt_schedule_irq+0x4e/0x90 kernel/sched/core.c:5532 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_apic_timer_interrupt+0x12/0x20 arch/x86/include/asm/idtentry.h:635 RIP: 0010:check_kcov_mode kernel/kcov.c:163 [inline] RIP: 0010:__sanitizer_cov_trace_pc+0xd/0x60 kernel/kcov.c:197 Code: 00 00 4d 8b 03 48 0f bd ca 49 8b 45 00 48 63 c9 e9 64 ff ff ff 0f 1f 84 00 00 00 00 00 65 8b 05 79 9b 8e 7e 89 c1 48 8b 34 24 <81> e1 00 01 00 00 65 48 8b 14 25 00 f0 01 00 a9 00 01 ff 00 74 0e RSP: 0018:ffffc9000290f630 EFLAGS: 00000246 RAX: 0000000080000000 RBX: dead000000000100 RCX: 0000000080000000 RDX: 0000000000000000 RSI: ffffffff819aa47a RDI: 0000000000000003 RBP: ffffea00012e3240 R08: 0000000000000000 R09: 00000000012e3200 R10: ffffffff819aa46c R11: 0000000000000000 R12: 0000000000000000 R13: ffff888025a1e980 R14: 000000000000012d R15: dffffc0000000000 is_huge_zero_page include/linux/huge_mm.h:292 [inline] release_pages+0x13a/0x1d20 mm/swap.c:878 tlb_batch_pages_flush mm/mmu_gather.c:49 [inline] tlb_flush_mmu_free mm/mmu_gather.c:242 [inline] tlb_flush_mmu+0xe9/0x6b0 mm/mmu_gather.c:249 zap_pte_range mm/memory.c:1342 [inline] zap_pmd_range mm/memory.c:1380 [inline] zap_pud_range mm/memory.c:1409 [inline] zap_p4d_range mm/memory.c:1430 [inline] unmap_page_range+0x1a7f/0x2650 mm/memory.c:1451 unmap_single_vma+0x198/0x300 mm/memory.c:1496 unmap_vmas+0x16d/0x2f0 mm/memory.c:1528 exit_mmap+0x2a8/0x590 mm/mmap.c:3220 __mmput+0x122/0x470 kernel/fork.c:1082 mmput+0x58/0x60 kernel/fork.c:1103 exit_mm kernel/exit.c:501 [inline] do_exit+0xb6f/0x2ae0 kernel/exit.c:812 do_group_exit+0x125/0x310 kernel/exit.c:922 get_signal+0x42c/0x2100 kernel/signal.c:2773 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+0x148/0x250 kernel/entry/common.c:208 __syscall_exit_to_user_mode_work kernel/entry/common.c:290 [inline] syscall_exit_to_user_mode+0x19/0x50 kernel/entry/common.c:301 entry_SYSCALL_64_after_hwframe+0x44/0xae RIP: 0033:0x465ef9 Code: Unable to access opcode bytes at RIP 0x465ecf. RSP: 002b:00007f8d68472218 EFLAGS: 00000246 ORIG_RAX: 00000000000000ca RAX: fffffffffffffe00 RBX: 000000000056bf68 RCX: 0000000000465ef9 RDX: 0000000000000000 RSI: 0000000000000080 RDI: 000000000056bf68 RBP: 000000000056bf60 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 000000000056bf6c R13: 00007fff8a1d0d7f R14: 00007f8d68472300 R15: 0000000000022000