rcu: INFO: rcu_preempt self-detected stall on CPU rcu: 0-...!: (10500 ticks this GP) idle=80e/1/0x4000000000000000 softirq=39560/39560 fqs=0 (t=10501 jiffies g=67521 q=1627) rcu: rcu_preempt kthread starved for 10502 jiffies! g67521 f0x0 RCU_GP_WAIT_FQS(5) ->state=0x402 ->cpu=0 rcu: Unless rcu_preempt kthread gets sufficient CPU time, OOM is now expected behavior. rcu: RCU grace-period kthread stack dump: task:rcu_preempt state:I stack:28888 pid: 13 ppid: 2 flags:0x00004000 Call Trace: context_switch kernel/sched/core.c:4313 [inline] __schedule+0x90c/0x21a0 kernel/sched/core.c:5064 schedule+0xcf/0x270 kernel/sched/core.c:5143 schedule_timeout+0x148/0x250 kernel/time/timer.c:1878 rcu_gp_fqs_loop kernel/rcu/tree.c:1940 [inline] rcu_gp_kthread+0xbbe/0x1d70 kernel/rcu/tree.c:2113 kthread+0x3b1/0x4a0 kernel/kthread.c:292 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:296 NMI backtrace for cpu 0 CPU: 0 PID: 18825 Comm: syz-executor.5 Not tainted 5.11.0-rc4-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+0x107/0x163 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+0x1f4/0x230 kernel/rcu/tree_stall.h:337 print_cpu_stall kernel/rcu/tree_stall.h:569 [inline] check_cpu_stall kernel/rcu/tree_stall.h:643 [inline] rcu_pending kernel/rcu/tree.c:3751 [inline] rcu_sched_clock_irq.cold+0x48e/0xedf kernel/rcu/tree.c:2580 update_process_times+0x16d/0x200 kernel/time/timer.c:1782 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:1519 [inline] __hrtimer_run_queues+0x1c0/0xe40 kernel/time/hrtimer.c:1583 hrtimer_interrupt+0x334/0x940 kernel/time/hrtimer.c:1645 local_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1085 [inline] __sysvec_apic_timer_interrupt+0x146/0x540 arch/x86/kernel/apic/apic.c:1102 run_sysvec_on_irqstack_cond arch/x86/include/asm/irq_stack.h:91 [inline] sysvec_apic_timer_interrupt+0x48/0x100 arch/x86/kernel/apic/apic.c:1096 asm_sysvec_apic_timer_interrupt+0x12/0x20 arch/x86/include/asm/idtentry.h:628 RIP: 0010:unwind_next_frame+0xc28/0x1f90 arch/x86/kernel/unwind_orc.c:531 Code: 20 4c 8b 4c 24 18 e9 70 f7 ff ff e8 f9 4f ce ff e9 ee f7 ff ff 48 8b 44 24 60 4c 89 e2 4c 89 ff 48 89 4c 24 30 4c 89 4c 24 28 <4c> 89 44 24 20 48 8d 70 f8 48 89 44 24 18 e8 75 f2 ff ff 84 c0 0f RSP: 0018:ffffc90000006cd8 EFLAGS: 00000246 RAX: ffffc90000007c38 RBX: 1ffff92000000da3 RCX: ffffffff8df88ad3 RDX: ffffc90000006df8 RSI: 0000000000000000 RDI: ffffc90000006db0 RBP: 0000000000000002 R08: ffffffff8df88ace R09: ffffffff8df88ad2 R10: 0000000000082083 R11: 0000000000000001 R12: ffffc90000006df8 R13: ffffc90000006de5 R14: ffffc90000006e00 R15: ffffc90000006db0 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 mm/kasan/common.c:46 [inline] set_alloc_info mm/kasan/common.c:401 [inline] ____kasan_kmalloc.constprop.0+0x7f/0xa0 mm/kasan/common.c:429 kasan_slab_alloc include/linux/kasan.h:209 [inline] slab_post_alloc_hook mm/slab.h:512 [inline] slab_alloc_node mm/slab.c:3257 [inline] kmem_cache_alloc_node_trace+0x1d3/0x520 mm/slab.c:3596 __do_kmalloc_node mm/slab.c:3618 [inline] __kmalloc_node_track_caller+0x38/0x60 mm/slab.c:3633 __kmalloc_reserve net/core/skbuff.c:142 [inline] __alloc_skb+0xae/0x5a0 net/core/skbuff.c:210 alloc_skb include/linux/skbuff.h:1099 [inline] ip_frag_next+0x11e/0x9a0 net/ipv4/ip_output.c:705 ip_do_fragment+0x762/0x1450 net/ipv4/ip_output.c:902 ip_fragment.constprop.0+0x174/0x240 net/ipv4/ip_output.c:581 __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:441 [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:4776 [inline] netdev_start_xmit include/linux/netdevice.h:4790 [inline] xmit_one net/core/dev.c:3574 [inline] dev_hard_start_xmit+0x1eb/0x920 net/core/dev.c:3590 __dev_queue_xmit+0x21db/0x2dd0 net/core/dev.c:4151 neigh_hh_output include/net/neighbour.h:499 [inline] neigh_output include/net/neighbour.h:508 [inline] ip6_finish_output2+0x8db/0x16c0 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+0x1db/0x520 net/ipv6/ip6_output.c:215 dst_output include/net/dst.h:441 [inline] NF_HOOK include/linux/netfilter.h:301 [inline] ndisc_send_skb+0xa90/0x1750 net/ipv6/ndisc.c:508 ndisc_send_rs+0x12e/0x700 net/ipv6/ndisc.c:702 addrconf_rs_timer+0x3f2/0x820 net/ipv6/addrconf.c:3874 call_timer_fn+0x1a5/0x6b0 kernel/time/timer.c:1417 expire_timers kernel/time/timer.c:1462 [inline] __run_timers.part.0+0x67c/0xa50 kernel/time/timer.c:1731 __run_timers kernel/time/timer.c:1712 [inline] run_timer_softirq+0xb3/0x1d0 kernel/time/timer.c:1744 __do_softirq+0x2bc/0xa29 kernel/softirq.c:343 asm_call_irq_on_stack+0xf/0x20 __run_on_irqstack arch/x86/include/asm/irq_stack.h:26 [inline] run_on_irqstack_cond arch/x86/include/asm/irq_stack.h:77 [inline] do_softirq_own_stack+0xaa/0xd0 arch/x86/kernel/irq_64.c:77 invoke_softirq kernel/softirq.c:226 [inline] __irq_exit_rcu kernel/softirq.c:420 [inline] irq_exit_rcu+0x134/0x200 kernel/softirq.c:432 sysvec_apic_timer_interrupt+0x4d/0x100 arch/x86/kernel/apic/apic.c:1096 asm_sysvec_apic_timer_interrupt+0x12/0x20 arch/x86/include/asm/idtentry.h:628 RIP: 0010:on_stack arch/x86/include/asm/stacktrace.h:45 [inline] RIP: 0010:stack_access_ok arch/x86/kernel/unwind_orc.c:342 [inline] RIP: 0010:deref_stack_reg+0x52/0x150 arch/x86/kernel/unwind_orc.c:352 Code: 84 c0 74 08 3c 03 0f 8e d7 00 00 00 41 8b 04 24 85 c0 74 62 49 8d 7c 24 08 48 b8 00 00 00 00 00 fc ff df 48 89 fa 48 c1 ea 03 <80> 3c 02 00 0f 85 c3 00 00 00 49 8d 7c 24 10 4d 8b 6c 24 08 48 b8 RSP: 0018:ffffc90001dd6240 EFLAGS: 00000a06 RAX: dffffc0000000000 RBX: ffffc90001dd6390 RCX: ffffffff8d857dff RDX: 1ffff920003bac6a RSI: ffffc90001dd6748 RDI: ffffc90001dd6350 RBP: ffffc90001dd6748 R08: ffffffff8d857dfa R09: ffffffff8d857dfe R10: 0000000000082083 R11: 0000000000000001 R12: ffffc90001dd6348 R13: ffffc90001dd637d R14: ffffc90001dd6398 R15: ffffc90001dd6348 unwind_next_frame+0xc3b/0x1f90 arch/x86/kernel/unwind_orc.c:531 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 mm/kasan/common.c:46 [inline] set_alloc_info mm/kasan/common.c:401 [inline] ____kasan_kmalloc.constprop.0+0x7f/0xa0 mm/kasan/common.c:429 kasan_slab_alloc include/linux/kasan.h:209 [inline] slab_post_alloc_hook mm/slab.h:512 [inline] slab_alloc_node mm/slab.c:3257 [inline] kmem_cache_alloc_node_trace+0x1d3/0x520 mm/slab.c:3596 __do_kmalloc_node mm/slab.c:3618 [inline] __kmalloc_node_track_caller+0x38/0x60 mm/slab.c:3633 __kmalloc_reserve net/core/skbuff.c:142 [inline] __alloc_skb+0xae/0x5a0 net/core/skbuff.c:210 alloc_skb include/linux/skbuff.h:1099 [inline] nlmsg_new include/net/netlink.h:953 [inline] rtmsg_fib+0x1bc/0xdf0 net/ipv4/fib_semantics.c:512 fib_table_delete+0x6a3/0xa20 net/ipv4/fib_trie.c:1714 fib_magic+0x355/0x520 net/ipv4/fib_frontend.c:1087 fib_del_ifaddr+0x89d/0x13a0 net/ipv4/fib_frontend.c:1197 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:2040 call_netdevice_notifiers_mtu net/core/dev.c:2089 [inline] dev_set_mtu_ext+0x38b/0x590 net/core/dev.c:8620 do_setlink+0x50e/0x3a70 net/core/rtnetlink.c:2671 rtnl_group_changelink net/core/rtnetlink.c:3227 [inline] __rtnl_newlink+0xde5/0x16e0 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:2494 netlink_unicast_kernel net/netlink/af_netlink.c:1304 [inline] netlink_unicast+0x533/0x7d0 net/netlink/af_netlink.c:1330 netlink_sendmsg+0x856/0xd90 net/netlink/af_netlink.c:1919 sock_sendmsg_nosec net/socket.c:652 [inline] sock_sendmsg+0xcf/0x120 net/socket.c:672 ____sys_sendmsg+0x6e8/0x810 net/socket.c:2345 ___sys_sendmsg+0xf3/0x170 net/socket.c:2399 __sys_sendmsg+0xe5/0x1b0 net/socket.c:2432 do_syscall_64+0x2d/0x70 arch/x86/entry/common.c:46 entry_SYSCALL_64_after_hwframe+0x44/0xa9 RIP: 0033:0x45e219 Code: 0d b4 fb ff c3 66 2e 0f 1f 84 00 00 00 00 00 66 90 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 0f 83 db b3 fb ff c3 66 2e 0f 1f 84 00 00 00 00 RSP: 002b:00007fb58317cc68 EFLAGS: 00000246 ORIG_RAX: 000000000000002e RAX: ffffffffffffffda RBX: 0000000000000003 RCX: 000000000045e219 RDX: 0000000000000000 RSI: 0000000020000140 RDI: 0000000000000005 RBP: 000000000119bfc0 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 000000000119bf8c R13: 00007ffd4596e5cf R14: 00007fb58317d9c0 R15: 000000000119bf8c