rcu: INFO: rcu_preempt self-detected stall on CPU rcu: 1-...!: (10499 ticks this GP) idle=5d2/1/0x4000000000000000 softirq=12224/12224 fqs=2 (t=10500 jiffies g=11541 q=453) rcu: rcu_preempt kthread starved for 10495 jiffies! g11541 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:29176 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: 10331 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:get_stack_info_noinstr+0x21/0x110 arch/x86/kernel/dumpstack_64.c:160 Code: cc cc cc cc cc cc cc cc cc 41 55 41 54 49 89 fc 55 48 89 d5 53 48 89 f3 e8 fc 00 00 00 84 c0 75 0e 65 48 8b 14 25 00 f0 01 00 <48> 39 d3 74 07 5b 5d 41 5c 41 5d c3 48 c7 c7 ea 3a cd 8a e8 c7 31 RSP: 0018:ffffc90000db0750 EFLAGS: 00000246 RAX: 0000000000000000 RBX: ffff88806d810000 RCX: ffffc900017e0000 RDX: ffff88806d810000 RSI: ffff88806d810000 RDI: ffffc90000db07a0 RBP: ffffc90000db07f0 R08: 0000000000000001 R09: ffffc90000db07f0 R10: fffff520001b6109 R11: 0000000000000000 R12: ffffc90000db07a0 R13: ffffc90000db07f0 R14: ffffc90000db0828 R15: ffffc90000db07f0 get_stack_info+0x2d/0x90 arch/x86/kernel/dumpstack_64.c:183 __unwind_start+0x4ae/0x800 arch/x86/kernel/unwind_orc.c:665 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:2891 [inline] __kmalloc_node_track_caller+0x1e0/0x3f0 mm/slub.c:4495 __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] ndisc_alloc_skb+0x134/0x320 net/ipv6/ndisc.c:420 ndisc_send_rs+0x388/0x700 net/ipv6/ndisc.c:686 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:__sanitizer_cov_trace_pc+0x55/0x60 kernel/kcov.c:204 Code: 00 00 85 c0 74 2b 8b 82 a8 14 00 00 83 f8 02 75 20 48 8b 8a b0 14 00 00 8b 92 ac 14 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 RSP: 0018:ffffc900017dfb00 EFLAGS: 00000216 RAX: 00000000000000f7 RBX: ffffc90000e06d88 RCX: ffffc90014065000 RDX: 0000000000040000 RSI: ffffffff8166b859 RDI: ffffc90000e06dd0 RBP: ffffc90001ccfb78 R08: 0000000000000000 R09: 0000000000000001 R10: ffffffff83d89c58 R11: 0000000000000000 R12: ffffc90000e06d80 R13: 0000000000000001 R14: ffff88806d74b7a8 R15: 000000000119b000 __unqueue_futex+0xc9/0x1b0 kernel/futex.c:1438 mark_wake_futex+0x10f/0x1a0 kernel/futex.c:1456 futex_wake+0x3b4/0x490 kernel/futex.c:1616 do_futex+0x322/0x1960 kernel/futex.c:3768 __do_sys_futex+0x2a2/0x470 kernel/futex.c:3826 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:00007f28243cecf8 EFLAGS: 00000246 ORIG_RAX: 00000000000000ca RAX: ffffffffffffffda RBX: 000000000119bf88 RCX: 000000000045e219 RDX: 00000000000f4240 RSI: 0000000000000081 RDI: 000000000119bf8c RBP: 000000000119bf80 R08: 0000000000000009 R09: 0000000000000000 R10: ffffffffffffffff R11: 0000000000000246 R12: 000000000119bf8c R13: 00007ffeeecec29f R14: 00007f28243cf9c0 R15: 000000000119bf8c