rcu: INFO: rcu_preempt self-detected stall on CPU rcu: 1-...!: (10500 ticks this GP) idle=462/1/0x4000000000000000 softirq=14636/14636 fqs=0 (t=10500 jiffies g=14889 q=675) rcu: rcu_preempt kthread starved for 10500 jiffies! g14889 f0x0 RCU_GP_WAIT_FQS(5) ->state=0x0 ->cpu=1 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:29176 pid: 13 ppid: 2 flags:0x00004000 Call Trace: context_switch kernel/sched/core.c:4327 [inline] __schedule+0x90c/0x21a0 kernel/sched/core.c:5078 schedule+0xcf/0x270 kernel/sched/core.c:5157 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: 11392 Comm: syz-executor.4 Not tainted 5.11.0-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:1089 [inline] __sysvec_apic_timer_interrupt+0x146/0x540 arch/x86/kernel/apic/apic.c:1106 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:1100 asm_sysvec_apic_timer_interrupt+0x12/0x20 arch/x86/include/asm/idtentry.h:629 RIP: 0010:lock_acquire+0x1d2/0x720 kernel/locking/lockdep.c:5410 Code: 48 c7 c7 a0 a9 4b 89 48 83 c4 20 e8 78 ca a1 07 b8 ff ff ff ff 65 0f c1 05 ab 2a a9 7e 83 f8 01 0f 85 da 03 00 00 ff 34 24 9d <48> b8 00 00 00 00 00 fc ff df 48 01 c3 48 c7 03 00 00 00 00 48 c7 RSP: 0018:ffffc90000db09b0 EFLAGS: 00000246 RAX: 0000000000000001 RBX: 1ffff920001b6138 RCX: 0000000000000001 RDX: 1ffff1100e0984a8 RSI: 0000000000000101 RDI: 0000000000000000 RBP: 0000000000000000 R08: 0000000000000000 R09: ffffffff8f8667a7 R10: fffffbfff1f0ccf4 R11: 0000000000000000 R12: 0000000000000002 R13: ffffffff8bd73da0 R14: 0000000000000000 R15: 0000000000000000 rcu_lock_acquire include/linux/rcupdate.h:259 [inline] rcu_read_lock include/linux/rcupdate.h:648 [inline] ndisc_send_skb+0x882/0x1750 net/ipv6/ndisc.c:504 ndisc_send_rs+0x12e/0x700 net/ipv6/ndisc.c:702 addrconf_rs_timer+0x3f2/0x820 net/ipv6/addrconf.c:3875 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+0x29b/0x9f6 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:1100 asm_sysvec_apic_timer_interrupt+0x12/0x20 arch/x86/include/asm/idtentry.h:629 RIP: 0010:__schedule+0x1/0x21a0 kernel/sched/core.c:4960 Code: 5d 41 5c c3 e8 d0 c5 b9 f8 eb d9 e8 c9 c5 b9 f8 e9 4b ff ff ff e8 5f c5 b9 f8 e9 02 ff ff ff e8 75 c5 b9 f8 e9 6c ff ff ff 55 <48> 89 e5 41 57 48 8d 85 78 ff ff ff 41 56 49 c7 c6 40 4c 03 00 41 RSP: 0018:ffffc900014ff420 EFLAGS: 00000246 RAX: 1ffff1100e0985e8 RBX: ffff8880704c1bc0 RCX: ffffffff88fc1059 RDX: ffffed100e098379 RSI: 0000000000000008 RDI: 0000000000000001 RBP: ffffed100e098378 R08: 0000000000000000 R09: ffff8880704c1bc7 R10: ffffed100e098378 R11: 0000000000000000 R12: dffffc0000000000 R13: ffffffff8100456d R14: ffffc900014ff628 R15: ffffc900014ff5d8 preempt_schedule_common+0x45/0xc0 kernel/sched/core.c:5238 preempt_schedule_thunk+0x16/0x18 arch/x86/entry/thunk_64.S:35 unwind_next_frame+0xe54/0x1f90 arch/x86/kernel/unwind_orc.c:608 __unwind_start+0x51b/0x800 arch/x86/kernel/unwind_orc.c:696 unwind_start arch/x86/include/asm/unwind.h:60 [inline] arch_stack_walk+0x5c/0xe0 arch/x86/kernel/stacktrace.c:24 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:2892 [inline] kmem_cache_alloc_node+0x1e0/0x470 mm/slub.c:2928 alloc_vmap_area+0x13e/0x1e00 mm/vmalloc.c:1179 __get_vm_area_node+0x128/0x380 mm/vmalloc.c:2096 __vmalloc_node_range mm/vmalloc.c:2571 [inline] __vmalloc_node mm/vmalloc.c:2619 [inline] __vmalloc+0xf3/0x1a0 mm/vmalloc.c:2633 bpf_prog_alloc_no_stats+0x33/0x2e0 kernel/bpf/core.c:85 bpf_prog_alloc+0x2c/0x250 kernel/bpf/core.c:113 bpf_prog_load+0x656/0x1f40 kernel/bpf/syscall.c:2152 __do_sys_bpf+0x1251/0x4f10 kernel/bpf/syscall.c:4382 do_syscall_64+0x2d/0x70 arch/x86/entry/common.c:46 entry_SYSCALL_64_after_hwframe+0x44/0xa9 RIP: 0033:0x465d99 Code: ff ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 40 00 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 73 01 c3 48 c7 c1 bc ff ff ff f7 d8 64 89 01 48 RSP: 002b:00007f7280f6e188 EFLAGS: 00000246 ORIG_RAX: 0000000000000141 RAX: ffffffffffffffda RBX: 000000000056bf60 RCX: 0000000000465d99 RDX: 0000000000000048 RSI: 00000000200054c0 RDI: 0000000000000005 RBP: 00000000004bcf27 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 000000000056bf60 R13: 00007ffe7b6c5ccf R14: 00007f7280f6e300 R15: 0000000000022000