rcu: INFO: rcu_preempt self-detected stall on CPU rcu: 1-....: (10210 ticks this GP) idle=8b6/1/0x4000000000000000 softirq=22525/22527 fqs=5078 (t=10502 jiffies g=28845 q=336) NMI backtrace for cpu 1 CPU: 1 PID: 13199 Comm: syz-executor.3 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 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:__find_rr_leaf+0x303/0xd10 net/ipv6/route.c:812 Code: e8 f2 e7 be 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 5d ed be f9 45 39 f4 0f 85 fa RSP: 0018:ffffc90000db0628 EFLAGS: 00000246 RAX: 0000000000000000 RBX: ffff888025d71400 RCX: 0000000000000100 RDX: ffff88801d658000 RSI: ffffffff87b467ce RDI: ffff888025d71480 RBP: dffffc0000000000 R08: 0000000000000000 R09: 0000000000000000 R10: ffffffff87b468ba R11: 0000000000000000 R12: 0000000000000100 R13: ffffc90000db0910 R14: 0000000000000000 R15: ffff888024d1c8a0 find_rr_leaf net/ipv6/route.c:864 [inline] rt6_select net/ipv6/route.c:908 [inline] fib6_table_lookup+0x5b3/0xa20 net/ipv6/route.c:2195 ip6_pol_route+0x1e1/0x11c0 net/ipv6/route.c:2231 pol_lookup_func include/net/ip6_fib.h:579 [inline] fib6_rule_lookup+0x111/0x6f0 net/ipv6/fib6_rules.c:115 ip6_route_input_lookup net/ipv6/route.c:2301 [inline] ip6_route_input+0x681/0xad0 net/ipv6/route.c:2470 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:5365 __netif_receive_skb+0x27/0x1c0 net/core/dev.c:5479 process_backlog+0x232/0x6c0 net/core/dev.c:6346 __napi_poll+0xaf/0x440 net/core/dev.c:6892 napi_poll net/core/dev.c:6959 [inline] net_rx_action+0x801/0xb40 net/core/dev.c:7036 __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 asm_sysvec_apic_timer_interrupt+0x12/0x20 arch/x86/include/asm/idtentry.h:632 RIP: 0010:get_lock_parent_ip include/linux/ftrace.h:841 [inline] RIP: 0010:preempt_latency_start kernel/sched/core.c:4711 [inline] RIP: 0010:preempt_latency_start kernel/sched/core.c:4708 [inline] RIP: 0010:preempt_schedule_common+0x72/0xc0 kernel/sched/core.c:5234 Code: 00 00 48 89 df 65 ff 0d ec 06 fe 76 e8 97 47 b3 f8 80 7d 00 00 75 49 48 8b 03 a8 08 75 bd 5b 5d 41 5c 41 5d c3 4c 8b 6c 24 20 <4c> 89 ef e8 26 8e 55 f8 85 c0 75 1e 48 8d bb 80 13 00 00 48 89 f8 RSP: 0018:ffffc90001d8f708 EFLAGS: 00000246 RAX: 0000000000000001 RBX: ffff88801d658000 RCX: 0000000000000000 RDX: 0000000000000001 RSI: 0000000000000004 RDI: 0000000000000001 RBP: ffffed1003acb000 R08: 0000000000000000 R09: ffff888019645f03 R10: ffffed10032c8be0 R11: 0000000000000000 R12: dffffc0000000000 R13: ffffffff8100453d R14: dffffc0000000000 R15: 00007f3b7718c000 preempt_schedule_thunk+0x16/0x18 arch/x86/entry/thunk_64.S:35 __raw_spin_unlock include/linux/spinlock_api_smp.h:152 [inline] _raw_spin_unlock+0x36/0x40 kernel/locking/spinlock.c:183 spin_unlock include/linux/spinlock.h:394 [inline] zap_pte_range mm/memory.c:1332 [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+0xf98/0x2650 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:3218 __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:00007f3b767ef188 EFLAGS: 00000246 ORIG_RAX: 000000000000002c RAX: 0000000000278000 RBX: 000000000056bf60 RCX: 0000000000465ef9 RDX: ffffffffffffffef RSI: 0000000020d7cfcb RDI: 0000000000000005 RBP: 00000000004bcd1c R08: 0000000000000000 R09: 0000000000000053 R10: 0000000000000000 R11: 0000000000000246 R12: 000000000056bf60 R13: 00007ffe6d66844f R14: 00007f3b767ef300 R15: 0000000000022000