rcu: INFO: rcu_preempt self-detected stall on CPU rcu: 1-....: (1 GPs behind) idle=afe/1/0x4000000000000000 softirq=11617/11618 fqs=5171 (t=10500 jiffies g=10397 q=45950) NMI backtrace for cpu 1 CPU: 1 PID: 9991 Comm: syz-executor.0 Not tainted 5.12.0-rc6-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+0x141/0x1d7 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:1537 [inline] __hrtimer_run_queues+0x1c0/0xe40 kernel/time/hrtimer.c:1601 hrtimer_interrupt+0x330/0xa00 kernel/time/hrtimer.c:1663 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:unwind_next_frame+0x111/0x1ce0 arch/x86/kernel/unwind_orc.c:428 Code: 24 10 49 8d 46 38 48 89 c2 48 89 44 24 08 48 b8 00 00 00 00 00 fc ff df 48 c1 ea 03 80 3c 02 00 0f 85 23 15 00 00 49 8b 46 38 01 00 00 00 48 89 44 24 18 e8 70 bb 1b 00 49 8d 46 50 48 89 c2 RSP: 0018:ffffc90000dbf880 EFLAGS: 00000246 RAX: ffffc90000dc04f0 RBX: 1ffff920001b7f18 RCX: 0000000000000000 RDX: 1ffff920001b7f32 RSI: 0000000000000000 RDI: ffffc90000dbf958 RBP: 0000000000000002 R08: ffffffff8eb72920 R09: 0000000000000001 R10: fffff520001b7f36 R11: 0000000000084087 R12: ffffc90000dbf9a0 R13: 0000000000000000 R14: ffffc90000dbf958 R15: ffff888010441c80 arch_stack_walk+0x7d/0xe0 arch/x86/kernel/stacktrace.c:25 stack_trace_save+0x8c/0xc0 kernel/stacktrace.c:121 kasan_save_stack+0x1b/0x40 mm/kasan/common.c:38 kasan_set_track+0x1c/0x30 mm/kasan/common.c:46 kasan_set_free_info+0x20/0x30 mm/kasan/generic.c:357 ____kasan_slab_free mm/kasan/common.c:360 [inline] ____kasan_slab_free mm/kasan/common.c:325 [inline] __kasan_slab_free+0xf5/0x130 mm/kasan/common.c:367 kasan_slab_free include/linux/kasan.h:199 [inline] slab_free_hook mm/slub.c:1562 [inline] slab_free_freelist_hook+0x92/0x210 mm/slub.c:1600 slab_free mm/slub.c:3161 [inline] kfree+0xe5/0x7f0 mm/slub.c:4213 skb_free_head net/core/skbuff.c:650 [inline] skb_release_data+0x622/0x750 net/core/skbuff.c:671 skb_release_all net/core/skbuff.c:725 [inline] __kfree_skb net/core/skbuff.c:739 [inline] kfree_skb net/core/skbuff.c:757 [inline] kfree_skb+0x133/0x3f0 net/core/skbuff.c:751 enqueue_to_backlog+0x210/0x1090 net/core/dev.c:4641 netif_rx_internal+0x120/0x640 net/core/dev.c:4868 netif_rx+0x7f/0x510 net/core/dev.c:4895 loopback_xmit+0x222/0x630 drivers/net/loopback.c:88 __netdev_start_xmit include/linux/netdevice.h:4825 [inline] netdev_start_xmit include/linux/netdevice.h:4839 [inline] xmit_one net/core/dev.c:3605 [inline] dev_hard_start_xmit+0x1eb/0x920 net/core/dev.c:3621 __dev_queue_xmit+0x2121/0x2e00 net/core/dev.c:4194 neigh_hh_output include/net/neighbour.h:499 [inline] neigh_output include/net/neighbour.h:508 [inline] ip_finish_output2+0xeec/0x21f0 net/ipv4/ip_output.c:230 ip_do_fragment+0x6f2/0x1450 net/ipv4/ip_output.c:914 ip_fragment.constprop.0+0x174/0x240 net/ipv4/ip_output.c:582 __ip_finish_output net/ipv4/ip_output.c:306 [inline] __ip_finish_output+0x2de/0x640 net/ipv4/ip_output.c:290 ip_finish_output+0x35/0x200 net/ipv4/ip_output.c:318 NF_HOOK_COND include/linux/netfilter.h:290 [inline] ip_output+0x196/0x310 net/ipv4/ip_output.c:432 dst_output include/net/dst.h:448 [inline] ip_local_out+0xaf/0x1a0 net/ipv4/ip_output.c:126 iptunnel_xmit+0x5a3/0x9c0 net/ipv4/ip_tunnel_core.c:82 geneve_xmit_skb drivers/net/geneve.c:959 [inline] geneve_xmit+0xde1/0x2f60 drivers/net/geneve.c:1059 __netdev_start_xmit include/linux/netdevice.h:4825 [inline] netdev_start_xmit include/linux/netdevice.h:4839 [inline] xmit_one net/core/dev.c:3605 [inline] dev_hard_start_xmit+0x1eb/0x920 net/core/dev.c:3621 __dev_queue_xmit+0x2121/0x2e00 net/core/dev.c:4194 neigh_hh_output include/net/neighbour.h:499 [inline] neigh_output include/net/neighbour.h:508 [inline] ip6_finish_output2+0x911/0x1700 net/ipv6/ip6_output.c:117 __ip6_finish_output net/ipv6/ip6_output.c:182 [inline] __ip6_finish_output+0x4c1/0xe10 net/ipv6/ip6_output.c:161 ip6_finish_output+0x35/0x200 net/ipv6/ip6_output.c:192 NF_HOOK_COND include/linux/netfilter.h:290 [inline] ip6_output+0x1e4/0x530 net/ipv6/ip6_output.c:215 dst_output include/net/dst.h:448 [inline] NF_HOOK include/linux/netfilter.h:301 [inline] ndisc_send_skb+0xa99/0x1750 net/ipv6/ndisc.c:508 ndisc_send_rs+0x12e/0x6f0 net/ipv6/ndisc.c:702 addrconf_rs_timer+0x3f2/0x820 net/ipv6/addrconf.c:3877 call_timer_fn+0x1a5/0x6b0 kernel/time/timer.c:1431 expire_timers kernel/time/timer.c:1476 [inline] __run_timers.part.0+0x67c/0xa50 kernel/time/timer.c:1745 __run_timers kernel/time/timer.c:1726 [inline] run_timer_softirq+0xb3/0x1d0 kernel/time/timer.c:1758 __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:__sanitizer_cov_trace_pc+0x59/0x60 kernel/kcov.c:205 Code: 74 2b 8b 82 10 15 00 00 83 f8 02 75 20 48 8b 8a 18 15 00 00 8b 92 14 15 00 00 48 8b 01 48 83 c0 01 48 39 c2 76 07 48 89 34 c1 <48> 89 01 c3 0f 1f 00 41 55 41 54 49 89 fc 55 48 bd eb 83 b5 80 46 RSP: 0018:ffffc90017966748 EFLAGS: 00000216 RAX: 000000000000663b RBX: ffff8880145ea100 RCX: ffffc90002491000 RDX: 0000000000040000 RSI: ffffffff878ff235 RDI: ffff8880145ea126 RBP: 0000000000000000 R08: 0000000000000020 R09: 0000000000000000 R10: ffffffff878ff15b R11: 0000000000000000 R12: 0000000000000003 R13: 0000000000000003 R14: 00000000ac141418 R15: ffff8880145ea120 tnode_new+0x245/0x340 net/ipv4/fib_trie.c:402 inflate net/ipv4/fib_trie.c:595 [inline] resize+0x950/0x2140 net/ipv4/fib_trie.c:868 trie_rebalance net/ipv4/fib_trie.c:1094 [inline] fib_remove_alias net/ipv4/fib_trie.c:1654 [inline] fib_remove_alias+0x301/0x4a0 net/ipv4/fib_trie.c:1636 fib_table_delete+0x71c/0xa40 net/ipv4/fib_trie.c:1757 fib_magic+0x355/0x520 net/ipv4/fib_frontend.c:1087 fib_del_ifaddr+0xce2/0x13a0 net/ipv4/fib_frontend.c:1297 fib_inetaddr_event+0xb4/0x2a0 net/ipv4/fib_frontend.c:1428 notifier_call_chain+0xb5/0x200 kernel/notifier.c:83 blocking_notifier_call_chain kernel/notifier.c:337 [inline] blocking_notifier_call_chain+0x67/0x90 kernel/notifier.c:325 __inet_del_ifa+0x460/0xf60 net/ipv4/devinet.c:428 inet_del_ifa net/ipv4/devinet.c:465 [inline] inetdev_destroy net/ipv4/devinet.c:318 [inline] inetdev_event+0x689/0x15c0 net/ipv4/devinet.c:1598 notifier_call_chain+0xb5/0x200 kernel/notifier.c:83 call_netdevice_notifiers_info+0xb5/0x130 net/core/dev.c:2075 call_netdevice_notifiers_mtu net/core/dev.c:2124 [inline] dev_set_mtu_ext+0x397/0x5a0 net/core/dev.c:8828 do_setlink+0x50e/0x3a70 net/core/rtnetlink.c:2671 rtnl_group_changelink net/core/rtnetlink.c:3227 [inline] __rtnl_newlink+0xbe9/0x1710 net/core/rtnetlink.c:3381 rtnl_newlink+0x64/0xa0 net/core/rtnetlink.c:3491 rtnetlink_rcv_msg+0x44e/0xad0 net/core/rtnetlink.c:5553 netlink_rcv_skb+0x153/0x420 net/netlink/af_netlink.c:2502 netlink_unicast_kernel net/netlink/af_netlink.c:1312 [inline] netlink_unicast+0x533/0x7d0 net/netlink/af_netlink.c:1338 netlink_sendmsg+0x856/0xd90 net/netlink/af_netlink.c:1927 sock_sendmsg_nosec net/socket.c:654 [inline] sock_sendmsg+0xcf/0x120 net/socket.c:674 ____sys_sendmsg+0x6e8/0x810 net/socket.c:2350 ___sys_sendmsg+0xf3/0x170 net/socket.c:2404 __sys_sendmsg+0xe5/0x1b0 net/socket.c:2433 do_syscall_64+0x2d/0x70 arch/x86/entry/common.c:46 entry_SYSCALL_64_after_hwframe+0x44/0xae RIP: 0033:0x466459 Code: Unable to access opcode bytes at RIP 0x46642f. RSP: 002b:00007fdc5c1af188 EFLAGS: 00000246 ORIG_RAX: 000000000000002e RAX: ffffffffffffffda RBX: 000000000056bf60 RCX: 0000000000466459 RDX: 0000000000000000 RSI: 0000000020000140 RDI: 0000000000000003 RBP: 00000000004bf9fb R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 000000000056bf60 R13: 00007fff695111af R14: 00007fdc5c1af300 R15: 0000000000022000