rcu: INFO: rcu_preempt self-detected stall on CPU rcu: 0-...!: (10500 ticks this GP) idle=772/1/0x4000000000000004 softirq=50015/50015 fqs=0 rcu: (t=10501 jiffies g=78309 q=68) rcu: rcu_preempt kthread starved for 10502 jiffies! g78309 f0x0 RCU_GP_WAIT_FQS(5) ->state=0x402 ->cpu=0 rcu: RCU grace-period kthread stack dump: rcu_preempt I25848 10 2 0x80000000 Call Trace: context_switch kernel/sched/core.c:2831 [inline] __schedule+0x897/0x1e60 kernel/sched/core.c:3472 schedule+0xfe/0x350 kernel/sched/core.c:3516 schedule_timeout+0x14a/0x250 kernel/time/timer.c:1803 rcu_gp_fqs_loop+0x6ba/0x970 kernel/rcu/tree.c:1948 rcu_gp_kthread+0x2bb/0xc10 kernel/rcu/tree.c:2105 kthread+0x357/0x430 kernel/kthread.c:246 ret_from_fork+0x3a/0x50 arch/x86/entry/entry_64.S:352 NMI backtrace for cpu 0 CPU: 0 PID: 21620 Comm: syz-executor4 Not tainted 4.20.0+ #11 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 Call Trace: __dump_stack lib/dump_stack.c:77 [inline] dump_stack+0x1db/0x2d0 lib/dump_stack.c:113 nmi_cpu_backtrace.cold+0x63/0xa4 lib/nmi_backtrace.c:101 nmi_trigger_cpumask_backtrace+0x1be/0x236 lib/nmi_backtrace.c:62 arch_trigger_cpumask_backtrace+0x14/0x20 arch/x86/kernel/apic/hw_nmi.c:38 trigger_single_cpu_backtrace include/linux/nmi.h:164 [inline] rcu_dump_cpu_stacks+0x183/0x1cf kernel/rcu/tree.c:1211 print_cpu_stall.cold+0x227/0x40c kernel/rcu/tree.c:1348 check_cpu_stall kernel/rcu/tree.c:1422 [inline] rcu_pending kernel/rcu/tree.c:3018 [inline] rcu_check_callbacks+0xb32/0x1380 kernel/rcu/tree.c:2521 update_process_times+0x32/0x80 kernel/time/timer.c:1635 tick_sched_handle+0xa2/0x190 kernel/time/tick-sched.c:161 tick_sched_timer+0x47/0x130 kernel/time/tick-sched.c:1271 __run_hrtimer kernel/time/hrtimer.c:1389 [inline] __hrtimer_run_queues+0x3a7/0x1050 kernel/time/hrtimer.c:1451 hrtimer_interrupt+0x314/0x770 kernel/time/hrtimer.c:1509 local_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1035 [inline] smp_apic_timer_interrupt+0x18d/0x760 arch/x86/kernel/apic/apic.c:1060 apic_timer_interrupt+0xf/0x20 arch/x86/entry/entry_64.S:807 RIP: 0010:__sanitizer_cov_trace_cmp1+0x17/0x20 kernel/kcov.c:151 Code: 54 10 f0 4a 89 4c d8 20 4c 89 08 c3 0f 1f 80 00 00 00 00 55 40 0f b6 d6 40 0f b6 f7 31 ff 48 89 e5 48 8b 4d 08 e8 79 ff ff ff <5d> c3 0f 1f 80 00 00 00 00 55 0f b7 d6 0f b7 f7 bf 02 00 00 00 48 RSP: 0018:ffff8880ae607128 EFLAGS: 00000206 ORIG_RAX: ffffffffffffff13 RAX: 0000000000000303 RBX: ffff8880a0a64040 RCX: ffffffff86bffce8 RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000000 RBP: ffff8880ae607128 R08: ffff8880a0f06280 R09: 0000000000000000 R10: ffff8880a0f06280 R11: 0000000000000000 R12: 0000000000000002 R13: ffff8880ae607678 R14: 0000000000000000 R15: 0000000000000000 xfrm_policy_match+0x1c8/0x2d0 net/xfrm/xfrm_policy.c:1890 __xfrm_policy_eval_candidates net/xfrm/xfrm_policy.c:2022 [inline] xfrm_policy_eval_candidates net/xfrm/xfrm_policy.c:2053 [inline] xfrm_policy_lookup_bytype+0x95f/0xdb0 net/xfrm/xfrm_policy.c:2113 xfrm_policy_lookup+0x7e/0x90 net/xfrm/xfrm_policy.c:2145 xfrm_bundle_lookup net/xfrm/xfrm_policy.c:2939 [inline] xfrm_lookup_with_ifid+0x8cf/0x2a90 net/xfrm/xfrm_policy.c:3080 xfrm_lookup net/xfrm/xfrm_policy.c:3172 [inline] xfrm_lookup_route+0x3b/0x1f0 net/xfrm/xfrm_policy.c:3183 ip_route_output_flow+0xad/0xc0 net/ipv4/route.c:2582 ip_route_output_ports include/net/route.h:161 [inline] igmpv3_newpack+0x54c/0x14a0 net/ipv4/igmp.c:362 add_grhead.isra.0+0x235/0x300 net/ipv4/igmp.c:433 add_grec+0x1086/0x1370 net/ipv4/igmp.c:566 igmpv3_send_cr net/ipv4/igmp.c:696 [inline] igmp_ifc_timer_expire+0x5c2/0xbd0 net/ipv4/igmp.c:793 call_timer_fn+0x254/0x900 kernel/time/timer.c:1325 expire_timers kernel/time/timer.c:1362 [inline] __run_timers+0x6fc/0xd50 kernel/time/timer.c:1681 run_timer_softirq+0x52/0xb0 kernel/time/timer.c:1694 __do_softirq+0x30b/0xb11 kernel/softirq.c:292 invoke_softirq kernel/softirq.c:373 [inline] irq_exit+0x180/0x1d0 kernel/softirq.c:413 exiting_irq arch/x86/include/asm/apic.h:536 [inline] smp_apic_timer_interrupt+0x1b7/0x760 arch/x86/kernel/apic/apic.c:1062 apic_timer_interrupt+0xf/0x20 arch/x86/entry/entry_64.S:807 RIP: 0010:rcu_dynticks_curr_cpu_in_eqs+0x2c/0x170 kernel/rcu/tree.c:302 Code: 89 e5 41 56 49 be 00 00 00 00 00 fc ff df 41 55 4c 8d 6d e0 41 54 49 c7 c4 c0 db 02 00 53 48 8d 5d 80 48 c1 eb 03 48 83 ec 68 <48> c7 45 80 b3 8a b5 41 4a 8d 04 33 48 c7 45 88 6e 52 38 89 48 c7 RSP: 0018:ffff888051ddf148 EFLAGS: 00000296 ORIG_RAX: ffffffffffffff13 RAX: 0000000000000001 RBX: 1ffff1100a3bbe2a RCX: 1ffffffff14b7b27 RDX: 0000000000000000 RSI: ffffffff81baf8f2 RDI: ffff8880a0f06afc RBP: ffff888051ddf1d0 R08: ffff8880a0f06280 R09: fffff940002b8e1f R10: fffff940002b8e1e R11: ffffea00015c70f3 R12: 000000000002dbc0 R13: ffff888051ddf1b0 R14: dffffc0000000000 R15: 0000000000000000 rcu_is_watching+0x10/0x30 kernel/rcu/tree.c:932 rcu_read_unlock include/linux/rcupdate.h:657 [inline] __unlock_page_memcg+0x78/0x100 mm/memcontrol.c:1932 unlock_page_memcg+0x2c/0x40 mm/memcontrol.c:1941 page_remove_file_rmap mm/rmap.c:1252 [inline] page_remove_rmap+0x82a/0x1990 mm/rmap.c:1303 zap_pte_range mm/memory.c:1090 [inline] zap_pmd_range mm/memory.c:1192 [inline] zap_pud_range mm/memory.c:1221 [inline] zap_p4d_range mm/memory.c:1242 [inline] unmap_page_range+0xf0f/0x25a0 mm/memory.c:1263 unmap_single_vma+0x19d/0x300 mm/memory.c:1308 unmap_vmas+0x17c/0x310 mm/memory.c:1339 exit_mmap+0x2d4/0x5d0 mm/mmap.c:3140 __mmput kernel/fork.c:1046 [inline] mmput+0x240/0x640 kernel/fork.c:1067 exit_mm kernel/exit.c:545 [inline] do_exit+0x9d3/0x2650 kernel/exit.c:854 do_group_exit+0x177/0x430 kernel/exit.c:970 __do_sys_exit_group kernel/exit.c:981 [inline] __se_sys_exit_group kernel/exit.c:979 [inline] __x64_sys_exit_group+0x44/0x50 kernel/exit.c:979 do_syscall_64+0x1a3/0x800 arch/x86/entry/common.c:290 entry_SYSCALL_64_after_hwframe+0x49/0xbe RIP: 0033:0x457ec9 Code: 28 c3 e8 aa 20 00 00 eb a8 cc cc cc cc cc cc cc cc 64 48 8b 0c 25 f8 ff ff ff 48 3b 61 10 76 2e 48 83 ec 18 48 89 6c 24 10 48 <8d> 6c 24 10 48 8b 42 08 48 8b 4a 10 48 89 04 24 48 89 4c 24 08 e8 RSP: 002b:00007ffd6fc42ba8 EFLAGS: 00000246 ORIG_RAX: 00000000000000e7 RAX: ffffffffffffffda RBX: 000000000000001e RCX: 0000000000457ec9 RDX: 0000000000411c91 RSI: fffffffffffffff7 RDI: 0000000000000000 RBP: 0000000000000000 R08: 0000000000000000 R09: 0000000000000001 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 0000000000000001 R14: 0000000000000083 R15: 0000000000000004