rcu: INFO: rcu_preempt self-detected stall on CPU rcu: 1-...!: (10500 ticks this GP) idle=9ba/1/0x4000000000000004 softirq=10106/10106 fqs=0 (t=10501 jiffies g=8053 q=116) rcu: rcu_preempt kthread starved for 10502 jiffies! g8053 f0x0 RCU_GP_WAIT_FQS(5) ->state=0x402 ->cpu=1 rcu: RCU grace-period kthread stack dump: rcu_preempt I29440 10 2 0x80004000 Call Trace: context_switch kernel/sched/core.c:3254 [inline] __schedule+0x755/0x1580 kernel/sched/core.c:3880 schedule+0xd9/0x260 kernel/sched/core.c:3947 schedule_timeout+0x486/0xc50 kernel/time/timer.c:1807 rcu_gp_fqs_loop kernel/rcu/tree.c:1611 [inline] rcu_gp_kthread+0x9b2/0x18c0 kernel/rcu/tree.c:1768 kthread+0x361/0x430 kernel/kthread.c:255 ret_from_fork+0x24/0x30 arch/x86/entry/entry_64.S:352 NMI backtrace for cpu 1 CPU: 1 PID: 8751 Comm: syz-executor.4 Not tainted 5.3.0-rc7+ #0 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+0x172/0x1f0 lib/dump_stack.c:113 nmi_cpu_backtrace.cold+0x70/0xb2 lib/nmi_backtrace.c:101 nmi_trigger_cpumask_backtrace+0x23b/0x28b 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_stall.h:254 print_cpu_stall kernel/rcu/tree_stall.h:455 [inline] check_cpu_stall kernel/rcu/tree_stall.h:529 [inline] rcu_pending kernel/rcu/tree.c:2736 [inline] rcu_sched_clock_irq.cold+0x4dd/0xc13 kernel/rcu/tree.c:2183 update_process_times+0x32/0x80 kernel/time/timer.c:1639 tick_sched_handle+0xa2/0x190 kernel/time/tick-sched.c:167 tick_sched_timer+0x53/0x140 kernel/time/tick-sched.c:1296 __run_hrtimer kernel/time/hrtimer.c:1389 [inline] __hrtimer_run_queues+0x364/0xe40 kernel/time/hrtimer.c:1451 hrtimer_interrupt+0x314/0x770 kernel/time/hrtimer.c:1509 local_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1106 [inline] smp_apic_timer_interrupt+0x160/0x610 arch/x86/kernel/apic/apic.c:1131 apic_timer_interrupt+0xf/0x20 arch/x86/entry/entry_64.S:830 RIP: 0010:get_current arch/x86/include/asm/current.h:15 [inline] RIP: 0010:__sanitizer_cov_trace_pc+0x4/0x50 kernel/kcov.c:101 Code: 39 09 41 bc f4 ff ff ff e8 6d 9f e9 ff 48 c7 05 be 8c 39 09 00 00 00 00 e9 77 e9 ff ff 90 90 90 90 90 90 90 90 90 55 48 89 e5 <65> 48 8b 04 25 40 fe 01 00 65 8b 15 a4 88 8f 7e 81 e2 00 01 1f 00 RSP: 0018:ffff8880ae9095b8 EFLAGS: 00000212 ORIG_RAX: ffffffffffffff13 RAX: ffff8880876bebf8 RBX: ffff8880876bebf8 RCX: ffffffff85c7e179 RDX: 0000000000000100 RSI: ffffffff85c7e006 RDI: ffff8880876bec00 RBP: ffff8880ae9095b8 R08: ffff888073c4e500 R09: fffffbfff14e9755 R10: ffff888073c4ee80 R11: ffff888073c4e500 R12: dffffc0000000000 R13: ffff8880876be900 R14: ffff8880876bec90 R15: ffff8880876bec90 hhf_dequeue+0x7a/0xa20 net/sched/sch_hhf.c:432 dequeue_skb net/sched/sch_generic.c:258 [inline] qdisc_restart net/sched/sch_generic.c:361 [inline] __qdisc_run+0x1e7/0x19d0 net/sched/sch_generic.c:379 __dev_xmit_skb net/core/dev.c:3533 [inline] __dev_queue_xmit+0x16f1/0x3650 net/core/dev.c:3838 dev_queue_xmit+0x18/0x20 net/core/dev.c:3902 neigh_hh_output include/net/neighbour.h:500 [inline] neigh_output include/net/neighbour.h:509 [inline] ip6_finish_output2+0xf58/0x2520 net/ipv6/ip6_output.c:116 __ip6_finish_output+0x444/0xa50 net/ipv6/ip6_output.c:142 ip6_finish_output+0x38/0x1f0 net/ipv6/ip6_output.c:152 NF_HOOK_COND include/linux/netfilter.h:294 [inline] ip6_output+0x235/0x7c0 net/ipv6/ip6_output.c:175 dst_output include/net/dst.h:436 [inline] NF_HOOK include/linux/netfilter.h:305 [inline] NF_HOOK include/linux/netfilter.h:299 [inline] mld_sendpack+0x9c7/0xea0 net/ipv6/mcast.c:1682 mld_send_cr net/ipv6/mcast.c:1978 [inline] mld_ifc_timer_expire+0x449/0x8a0 net/ipv6/mcast.c:2477 call_timer_fn+0x1ac/0x780 kernel/time/timer.c:1322 expire_timers kernel/time/timer.c:1366 [inline] __run_timers kernel/time/timer.c:1685 [inline] __run_timers kernel/time/timer.c:1653 [inline] run_timer_softirq+0x697/0x17a0 kernel/time/timer.c:1698 __do_softirq+0x262/0x98c kernel/softirq.c:292 invoke_softirq kernel/softirq.c:373 [inline] irq_exit+0x19b/0x1e0 kernel/softirq.c:413 exiting_irq arch/x86/include/asm/apic.h:537 [inline] smp_apic_timer_interrupt+0x1a3/0x610 arch/x86/kernel/apic/apic.c:1133 apic_timer_interrupt+0xf/0x20 arch/x86/entry/entry_64.S:830 RIP: 0010:in_lock_functions+0x2/0x20 kernel/locking/spinlock.c:397 Code: 53 00 e9 3e ff ff ff 48 c7 c7 c0 56 0f 8a e8 55 5f 53 00 eb 88 0f 1f 00 c3 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 31 c0 <48> 81 ff 30 00 41 87 72 0c 31 c0 48 81 ff 5d 0f 41 87 0f 92 c0 c3 RSP: 0018:ffff888073c57d00 EFLAGS: 00000246 ORIG_RAX: ffffffffffffff13 RAX: 0000000000000000 RBX: ffffffff81bcfd07 RCX: 1ffffffff1557230 RDX: 0000000000000000 RSI: ffffffff81bcfcdb RDI: ffffffff81bcfd07 RBP: ffff888073c57d18 R08: 1ffff1100db81af3 R09: ffffed100db81af4 R10: ffffed100db81af3 R11: ffff88806dc0d79b R12: ffff88809b770d80 R13: ffff8880a69e3340 R14: ffff8880a69e3298 R15: ffffffff87bda820 __raw_spin_lock include/linux/spinlock_api_smp.h:141 [inline] _raw_spin_lock+0x13/0x40 kernel/locking/spinlock.c:151 spin_lock include/linux/spinlock.h:338 [inline] inode_sb_list_del fs/inode.c:465 [inline] evict+0x187/0x680 fs/inode.c:560 iput_final fs/inode.c:1560 [inline] iput+0x530/0x8b0 fs/inode.c:1586 do_unlinkat+0x44c/0x6d0 fs/namei.c:4069 __do_sys_unlink fs/namei.c:4110 [inline] __se_sys_unlink fs/namei.c:4108 [inline] __x64_sys_unlink+0x42/0x50 fs/namei.c:4108 do_syscall_64+0xfd/0x6a0 arch/x86/entry/common.c:296 entry_SYSCALL_64_after_hwframe+0x49/0xbe RIP: 0033:0x459637 Code: 00 66 90 b8 58 00 00 00 0f 05 48 3d 01 f0 ff ff 0f 83 9d ba fb ff c3 66 2e 0f 1f 84 00 00 00 00 00 66 90 b8 57 00 00 00 0f 05 <48> 3d 01 f0 ff ff 0f 83 7d ba fb ff c3 66 2e 0f 1f 84 00 00 00 00 RSP: 002b:00007ffd7b7eba38 EFLAGS: 00000246 ORIG_RAX: 0000000000000057 RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 0000000000459637 RDX: 00007ffd7b7eba50 RSI: 00007ffd7b7eba50 RDI: 00007ffd7b7ebae0 RBP: 0000000000000002 R08: 0000000000000000 R09: 000000000000000e R10: 000000000000000a R11: 0000000000000246 R12: 00007ffd7b7ecb70 R13: 0000555557194940 R14: 0000000000000000 R15: 00007ffd7b7ecb70