IPVS: ftp: loaded support on port[0] = 21 IPVS: ftp: loaded support on port[0] = 21 rcu: INFO: rcu_preempt self-detected stall on CPU rcu: 1-...!: (10500 ticks this GP) idle=bd2/1/0x4000000000000004 softirq=62379/62379 fqs=0 rcu: (t=10500 jiffies g=83269 q=1629) rcu: rcu_preempt kthread starved for 10500 jiffies! g83269 f0x0 RCU_GP_WAIT_FQS(5) ->state=0x402 ->cpu=1 rcu: RCU grace-period kthread stack dump: rcu_preempt I25560 10 2 0x80000000 Call Trace: context_switch kernel/sched/core.c:2831 [inline] __schedule+0x897/0x1e90 kernel/sched/core.c:3472 schedule+0x105/0x420 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 1 CPU: 1 PID: 7520 Comm: syz-executor3 Not tainted 4.20.0+ #1 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_switch+0x37/0x80 kernel/kcov.c:224 Code: f4 53 48 8b 46 08 48 83 f8 20 74 55 77 3a 48 83 f8 08 74 46 48 83 f8 10 75 27 bf 03 00 00 00 4d 8b 2c 24 31 db 4d 85 ed 74 17 <49> 8b 74 dc 10 48 83 c3 01 48 8b 4d 08 e8 47 fe ff ff 49 39 dd 75 RSP: 0018:ffff8880ae707108 EFLAGS: 00000206 ORIG_RAX: ffffffffffffff13 RAX: 0000000000000302 RBX: 0000000000000004 RCX: ffffffff86c1fb37 RDX: 0000000000000002 RSI: 000000000000002f RDI: 0000000000000001 RBP: ffff8880ae707120 R08: ffff88808d7f0300 R09: 0000000000000000 R10: ffff88808d7f0300 R11: 0000000000000000 R12: ffffffff88e7cf80 R13: 0000000000000007 R14: 0000000000006020 R15: 0000000000000002 xfrm_flowi_dport include/net/xfrm.h:940 [inline] __xfrm4_selector_match net/xfrm/xfrm_policy.c:195 [inline] xfrm_selector_match+0x807/0xfc0 net/xfrm/xfrm_policy.c:219 xfrm_policy_match+0x1e9/0x2d0 net/xfrm/xfrm_policy.c:1894 __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_grec+0xa16/0x1370 net/ipv4/igmp.c:526 igmpv3_send_cr net/ipv4/igmp.c:652 [inline] igmp_ifc_timer_expire+0x743/0xbd0 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:arch_local_irq_restore arch/x86/include/asm/paravirt.h:766 [inline] RIP: 0010:__raw_spin_unlock_irqrestore include/linux/spinlock_api_smp.h:160 [inline] RIP: 0010:_raw_spin_unlock_irqrestore+0x95/0xe0 kernel/locking/spinlock.c:184 Code: 48 c7 c0 70 4f 92 89 48 ba 00 00 00 00 00 fc ff df 48 c1 e8 03 80 3c 10 00 75 39 48 83 3d 82 70 9c 01 00 74 24 48 89 df 57 9d <0f> 1f 44 00 00 bf 01 00 00 00 e8 5c b9 61 f9 65 8b 05 c5 0e 0c 78 RSP: 0018:ffff88808d7ffaf0 EFLAGS: 00000282 ORIG_RAX: ffffffffffffff13 RAX: 1ffffffff13249ee RBX: 0000000000000282 RCX: 0000000000000000 RDX: dffffc0000000000 RSI: 0000000000000001 RDI: 0000000000000282 RBP: ffff88808d7ffb00 R08: ffff88808d7f0300 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000000 R12: ffffffff8b6f14c8 R13: ffff88808d7f0300 R14: 00000000000af180 R15: ffffffff8b6f14c8 __debug_object_init+0x1c0/0x12d0 lib/debugobjects.c:418 debug_object_init_on_stack+0x19/0x20 lib/debugobjects.c:446 hrtimer_init_on_stack kernel/time/hrtimer.c:426 [inline] hrtimer_nanosleep+0x17a/0x640 kernel/time/hrtimer.c:1731 __do_sys_nanosleep kernel/time/hrtimer.c:1767 [inline] __se_sys_nanosleep kernel/time/hrtimer.c:1754 [inline] __x64_sys_nanosleep+0x1e0/0x280 kernel/time/hrtimer.c:1754 do_syscall_64+0x1a3/0x800 arch/x86/entry/common.c:290 entry_SYSCALL_64_after_hwframe+0x49/0xbe RIP: 0033:0x485540 Code: 00 00 48 c7 c0 d4 ff ff ff 64 c7 00 16 00 00 00 31 c0 eb be 66 0f 1f 44 00 00 83 3d 11 12 5d 00 00 75 14 b8 23 00 00 00 0f 05 <48> 3d 01 f0 ff ff 0f 83 c4 e0 f8 ff c3 48 83 ec 08 e8 3a 55 fd ff RSP: 002b:00007ffcf6884108 EFLAGS: 00000246 ORIG_RAX: 0000000000000023 RAX: ffffffffffffffda RBX: 000000000007db08 RCX: 0000000000485540 RDX: 0000000000000000 RSI: 0000000000000000 RDI: 00007ffcf6884110 RBP: 0000000000000b67 R08: 0000000000000001 R09: 000000000109e940 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 000000000007db08 R14: 000000000000032d R15: 0000000000000003 rcu: INFO: rcu_preempt detected expedited stalls on CPUs/tasks: { 1-... } 10714 jiffies s: 11125 root: 0x2/. rcu: blocking rcu_node structures: Task dump for CPU 1: syz-executor3 R running task 20440 7520 1 0x8000000e Call Trace: lock_acquire+0x1db/0x570 kernel/locking/lockdep.c:3841