rcu: INFO: rcu_preempt self-detected stall on CPU rcu: 1-...!: (1 GPs behind) idle=952/1/0x4000000000000000 softirq=20723/20724 fqs=1 (t=10500 jiffies g=27137 q=350) rcu: rcu_preempt kthread starved for 10498 jiffies! g27137 f0x0 RCU_GP_WAIT_FQS(5) ->state=0x0 ->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:R running task 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 1 CPU: 1 PID: 14004 Comm: syz-executor.5 Not tainted 5.11.0-rc3-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 Call Trace: <IRQ> __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:orc_ip arch/x86/kernel/unwind_orc.c:30 [inline] RIP: 0010:__orc_find+0x6f/0xf0 arch/x86/kernel/unwind_orc.c:52 Code: 72 4d 4c 89 e0 48 29 e8 48 89 c2 48 c1 e8 3f 48 c1 fa 02 48 01 d0 48 d1 f8 48 8d 5c 85 00 48 89 d8 48 c1 e8 03 42 0f b6 14 38 <48> 89 d8 83 e0 07 83 c0 03 38 d0 7c 04 84 d2 75 48 48 63 03 48 01 RSP: 0018:ffffc90000db02a0 EFLAGS: 00000213 RAX: 1ffffffff1ae4234 RBX: ffffffff8d7211a4 RCX: ffffffff89000c01 RDX: 0000000000000000 RSI: ffffffff8e0db6f8 RDI: ffffffff8d721164 RBP: ffffffff8d721164 R08: ffffffff8e0db7be R09: ffffffff8e0db6f8 R10: 0000000000082083 R11: 0000000000195fca R12: ffffffff8d7211e4 R13: ffffffff8d721164 R14: ffffffff8d721164 R15: dffffc0000000000 orc_find arch/x86/kernel/unwind_orc.c:173 [inline] unwind_next_frame+0x342/0x1f90 arch/x86/kernel/unwind_orc.c:443 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+0x82/0xa0 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/slub.c:2891 [inline] kmem_cache_alloc_node+0x1e0/0x470 mm/slub.c:2927 __alloc_skb+0x71/0x5a0 net/core/skbuff.c:198 alloc_skb include/linux/skbuff.h:1099 [inline] nlmsg_new include/net/netlink.h:953 [inline] __neigh_notify+0x84/0x160 net/core/neighbour.c:3357 neigh_cleanup_and_release+0x92/0x340 net/core/neighbour.c:102 neigh_del net/core/neighbour.c:194 [inline] neigh_remove_one+0x3cf/0x450 net/core/neighbour.c:215 neigh_forced_gc net/core/neighbour.c:244 [inline] neigh_alloc net/core/neighbour.c:391 [inline] ___neigh_create+0x16a4/0x25d0 net/core/neighbour.c:579 ip6_finish_output2+0xdf8/0x16c0 net/ipv6/ip6_output.c:114 __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 </IRQ> __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:find_va_links mm/vmalloc.c:554 [inline] RIP: 0010:merge_or_add_vmap_area mm/vmalloc.c:759 [inline] RIP: 0010:free_vmap_area_noflush+0x2cf/0xd00 mm/vmalloc.c:1436 Code: 93 08 00 00 48 bd 00 00 00 00 00 fc ff df 48 8b 04 24 4c 8b 70 08 e8 a0 07 c8 ff 48 8d 7b f8 48 89 f8 48 c1 e8 03 80 3c 28 00 <0f> 85 c4 07 00 00 48 8d 7b f0 4c 8b 63 f8 48 89 f8 48 c1 e8 03 80 RSP: 0018:ffffc9000113f6d0 EFLAGS: 00000246 RAX: 1ffff110026b38d9 RBX: ffff88801359c6d0 RCX: ffffc90013963000 RDX: 0000000000040000 RSI: ffffffff81aac220 RDI: ffff88801359c6c8 RBP: dffffc0000000000 R08: ffffc90001088000 R09: 0000000000000003 R10: ffffffff81aac276 R11: 0000000000000001 R12: ffff88801359c140 R13: ffff88801359c6d0 R14: ffffc90001088000 R15: ffffc90001086000 free_unmap_vmap_area mm/vmalloc.c:1455 [inline] remove_vm_area+0x1ca/0x230 mm/vmalloc.c:2188 vm_remove_mappings mm/vmalloc.c:2215 [inline] __vunmap+0x392/0xb50 mm/vmalloc.c:2277 __vfree+0x3c/0xd0 mm/vmalloc.c:2333 vfree+0x5a/0x90 mm/vmalloc.c:2364 bpf_prog_calc_tag+0x4f4/0x720 kernel/bpf/core.c:328 resolve_pseudo_ldimm64 kernel/bpf/verifier.c:9928 [inline] bpf_check+0x2c19/0xca90 kernel/bpf/verifier.c:12039 bpf_prog_load+0xe3e/0x1f40 kernel/bpf/syscall.c:2204 __do_sys_bpf+0x1251/0x4f10 kernel/bpf/syscall.c:4380 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:00007f152fa42c68 EFLAGS: 00000246 ORIG_RAX: 0000000000000141 RAX: ffffffffffffffda RBX: 0000000000000003 RCX: 000000000045e219 RDX: 0000000000000048 RSI: 00000000200054c0 RDI: 0000000000000005 RBP: 000000000119bfc0 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 000000000119bf8c R13: 00007ffeca9774df R14: 00007f152fa439c0 R15: 000000000119bf8c