rcu: INFO: rcu_preempt self-detected stall on CPU rcu: 0-....: (10500 ticks this GP) idle=e6a/1/0x4000000000000004 softirq=13154/13154 fqs=5250 (t=10502 jiffies g=13417 q=1453) NMI backtrace for cpu 0 CPU: 0 PID: 10309 Comm: syz-executor.0 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:hhf_dequeue+0x586/0xa20 net/sched/sch_hhf.c:438 Code: 48 c1 e8 03 42 0f b6 14 20 48 89 f8 83 e0 07 83 c0 03 38 d0 7c 08 84 d2 0f 85 b5 03 00 00 45 8b b5 ac 03 00 00 e8 ca 94 aa fb <49> 8d bd 14 03 00 00 48 89 f8 48 c1 e8 03 42 0f b6 14 20 48 89 f8 RSP: 0018:ffff8880ae808af8 EFLAGS: 00000206 ORIG_RAX: ffffffffffffff13 RAX: ffff8880a8de0440 RBX: ffff888062e10c38 RCX: ffffffff85c7dbb9 RDX: 0000000000000100 RSI: ffffffff85c7e086 RDI: ffff888062e10cec RBP: ffff8880ae808b48 R08: ffff8880a8de0440 R09: fffffbfff14e9755 R10: ffff8880a8de0d98 R11: ffff8880a8de0440 R12: dffffc0000000000 R13: ffff888062e10940 R14: 0000000000000000 R15: 0000000000000000 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 br_dev_queue_push_xmit+0x3f3/0x5c0 net/bridge/br_forward.c:52 br_nf_dev_queue_xmit+0x34e/0x1470 net/bridge/br_netfilter_hooks.c:796 NF_HOOK include/linux/netfilter.h:305 [inline] NF_HOOK include/linux/netfilter.h:299 [inline] br_nf_post_routing+0x1502/0x1d30 net/bridge/br_netfilter_hooks.c:844 nf_hook_entry_hookfn include/linux/netfilter.h:135 [inline] nf_hook_slow+0xbc/0x1e0 net/netfilter/core.c:512 nf_hook include/linux/netfilter.h:260 [inline] NF_HOOK include/linux/netfilter.h:303 [inline] br_forward_finish+0x215/0x400 net/bridge/br_forward.c:65 br_nf_hook_thresh+0x2e9/0x370 net/bridge/br_netfilter_hooks.c:1015 br_nf_forward_finish+0x66c/0xa90 net/bridge/br_netfilter_hooks.c:560 NF_HOOK include/linux/netfilter.h:305 [inline] NF_HOOK include/linux/netfilter.h:299 [inline] br_nf_forward_ip net/bridge/br_netfilter_hooks.c:630 [inline] br_nf_forward_ip+0xc74/0x21e0 net/bridge/br_netfilter_hooks.c:571 nf_hook_entry_hookfn include/linux/netfilter.h:135 [inline] nf_hook_slow+0xbc/0x1e0 net/netfilter/core.c:512 nf_hook include/linux/netfilter.h:260 [inline] NF_HOOK include/linux/netfilter.h:303 [inline] __br_forward+0x393/0xb00 net/bridge/br_forward.c:109 deliver_clone+0x61/0xc0 net/bridge/br_forward.c:125 br_flood+0x325/0x3d0 net/bridge/br_forward.c:232 br_handle_frame_finish+0xb46/0x1670 net/bridge/br_input.c:162 br_nf_hook_thresh+0x2e9/0x370 net/bridge/br_netfilter_hooks.c:1015 br_nf_pre_routing_finish_ipv6+0x6fb/0xd80 net/bridge/br_netfilter_ipv6.c:206 NF_HOOK include/linux/netfilter.h:305 [inline] br_nf_pre_routing_ipv6+0x456/0x832 net/bridge/br_netfilter_ipv6.c:236 br_nf_pre_routing+0x1743/0x2355 net/bridge/br_netfilter_hooks.c:501 nf_hook_entry_hookfn include/linux/netfilter.h:135 [inline] nf_hook_bridge_pre net/bridge/br_input.c:223 [inline] br_handle_frame+0x806/0x133e net/bridge/br_input.c:348 __netif_receive_skb_core+0xfc1/0x3060 net/core/dev.c:4907 __netif_receive_skb_one_core+0xa8/0x1a0 net/core/dev.c:5004 __netif_receive_skb+0x2c/0x1d0 net/core/dev.c:5120 process_backlog+0x206/0x750 net/core/dev.c:5951 napi_poll net/core/dev.c:6388 [inline] net_rx_action+0x4d6/0x1080 net/core/dev.c:6456 __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:ktime_get_ts64+0x1/0x3e0 kernel/time/timekeeping.c:881 Code: ff 48 c7 c7 50 f4 f2 88 e8 8c 36 49 00 e9 80 fd ff ff 48 89 7d c8 e8 7e 36 49 00 48 8b 7d c8 e9 eb fd ff ff 0f 1f 44 00 00 55 <48> 89 e5 41 57 41 56 41 55 41 54 41 52 53 48 89 fb 48 83 ec 30 e8 RSP: 0018:ffff88805d947e60 EFLAGS: 00000293 ORIG_RAX: ffffffffffffff13 RAX: ffff8880a8de0440 RBX: 0000000000000001 RCX: ffffffff8164cb09 RDX: 0000000000000000 RSI: ffffffff81647bde RDI: ffff88805d947ea8 RBP: ffff88805d947e78 R08: ffff8880a8de0440 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000000 R12: ffff88805d947ea8 R13: 1ffff1100bb28fd1 R14: ffffffff87adc560 R15: ffff88805d947ea8 __do_sys_clock_gettime kernel/time/posix-timers.c:1035 [inline] __se_sys_clock_gettime kernel/time/posix-timers.c:1025 [inline] __x64_sys_clock_gettime+0x151/0x240 kernel/time/posix-timers.c:1025 do_syscall_64+0xfd/0x6a0 arch/x86/entry/common.c:296 entry_SYSCALL_64_after_hwframe+0x49/0xbe RIP: 0033:0x45c72a Code: 25 18 00 00 00 00 74 01 f0 48 0f b1 3d 3f a0 61 00 48 39 c2 75 da f3 c3 0f 1f 84 00 00 00 00 00 48 63 ff b8 e4 00 00 00 0f 05 <48> 3d 00 f0 ff ff 77 06 f3 c3 0f 1f 40 00 48 c7 c2 d4 ff ff ff f7 RSP: 002b:00007fff2d774d68 EFLAGS: 00000246 ORIG_RAX: 00000000000000e4 RAX: ffffffffffffffda RBX: 000000000002b3b2 RCX: 000000000045c72a RDX: 0000000000000000 RSI: 00007fff2d774d70 RDI: 0000000000000001 RBP: 0000000000000001 R08: 000000009cb1f87a R09: 000000009cb1f87e R10: 00007fff2d774e70 R11: 0000000000000246 R12: 000000000075c9a0 R13: 000000000075c9a0 R14: 0000000000761fb8 R15: ffffffffffffffff