rcu: INFO: rcu_preempt self-detected stall on CPU rcu: 1-...!: (1 GPs behind) idle=4d2/1/0x4000000000000000 softirq=11958/11959 fqs=3 (t=11707 jiffies g=9089 q=639) rcu: rcu_preempt kthread starved for 6472 jiffies! g9089 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:29256 pid: 13 ppid: 2 flags:0x00004000 Call Trace: context_switch kernel/sched/core.c:4683 [inline] __schedule+0x8fc/0x26c0 kernel/sched/core.c:5940 schedule+0xd3/0x270 kernel/sched/core.c:6019 schedule_timeout+0x11d/0x250 kernel/time/timer.c:1892 rcu_gp_fqs_loop kernel/rcu/tree.c:2004 [inline] rcu_gp_kthread+0xd1a/0x2300 kernel/rcu/tree.c:2177 kthread+0x38b/0x460 kernel/kthread.c:319 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:295 rcu: Stack dump where RCU GP kthread last ran: Sending NMI from CPU 1 to CPUs 0: NMI backtrace for cpu 0 CPU: 0 PID: 0 Comm: swapper/0 Not tainted 5.13.0-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 RIP: 0010:native_apic_mem_write+0x8/0x10 arch/x86/include/asm/apic.h:110 Code: c7 80 66 bb 8d e8 b8 69 79 00 eb b0 66 0f 1f 44 00 00 be 01 00 00 00 e9 26 d8 29 00 cc cc cc cc cc cc 89 ff 89 b7 00 c0 5f ff 0f 1f 80 00 00 00 00 48 b8 00 00 00 00 00 fc ff df 53 89 fb 48 RSP: 0018:ffffc90000006da8 EFLAGS: 00000046 RAX: dffffc0000000000 RBX: ffffffff8a3b28c0 RCX: 0000000000000020 RDX: 1ffffffff147651a RSI: 00000000000005e0 RDI: 0000000000000380 RBP: ffff8880ba01f2c0 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000001 R11: 168ddf01a71dadb5 R12: 00000000000005e0 R13: 0000004487140ce6 R14: ffff8880ba026380 R15: 000000448714c029 FS: 0000000000000000(0000) GS:ffff8880ba000000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00005647392e68f0 CR3: 000000001cc04000 CR4: 00000000001506f0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: apic_write arch/x86/include/asm/apic.h:394 [inline] lapic_next_event+0x4d/0x80 arch/x86/kernel/apic/apic.c:472 clockevents_program_event+0x1cf/0x290 kernel/time/clockevents.c:334 hrtimer_interrupt+0x3c0/0x920 kernel/time/hrtimer.c:1676 local_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1089 [inline] __sysvec_apic_timer_interrupt+0x146/0x530 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:638 RIP: 0010:pv_wait_head_or_lock kernel/locking/qspinlock_paravirt.h:434 [inline] RIP: 0010:__pv_queued_spin_lock_slowpath+0x3ba/0xb40 kernel/locking/qspinlock.c:508 Code: eb c6 45 01 01 41 bc 00 80 00 00 48 c1 e9 03 83 e3 07 41 be 01 00 00 00 48 b8 00 00 00 00 00 fc ff df 4c 8d 2c 01 eb 0c f3 90 <41> 83 ec 01 0f 84 72 04 00 00 41 0f b6 45 00 38 d8 7f 08 84 c0 0f RSP: 0018:ffffc90000006f80 EFLAGS: 00000206 RAX: 0000000000000003 RBX: 0000000000000000 RCX: 1ffffffff16db944 RDX: 0000000000000001 RSI: ffffffff88ab1e60 RDI: ffffffff812cd4e1 RBP: ffffffff8b6dca20 R08: 0000000000000001 R09: 0000000000000001 R10: 0000000000000001 R11: ffffc90000007330 R12: 000000000000377a R13: fffffbfff16db944 R14: 0000000000000001 R15: ffff8880ba036800 pv_queued_spin_lock_slowpath arch/x86/include/asm/paravirt.h:585 [inline] queued_spin_lock_slowpath arch/x86/include/asm/qspinlock.h:51 [inline] queued_spin_lock include/asm-generic/qspinlock.h:85 [inline] do_raw_spin_lock+0x200/0x2b0 kernel/locking/spinlock_debug.c:113 spin_lock include/linux/spinlock.h:354 [inline] mac80211_hwsim_tx_frame_no_nl.isra.0+0x5ac/0x1020 drivers/net/wireless/mac80211_hwsim.c:1516 mac80211_hwsim_tx+0x42b/0x11b0 drivers/net/wireless/mac80211_hwsim.c:1669 drv_tx net/mac80211/driver-ops.h:35 [inline] ieee80211_tx_frags+0x4e0/0x9e0 net/mac80211/tx.c:1683 __ieee80211_tx+0x15a/0x610 net/mac80211/tx.c:1739 ieee80211_tx+0x282/0x390 net/mac80211/tx.c:1923 __ieee80211_subif_start_xmit+0x661/0xa80 net/mac80211/tx.c:4234 ieee80211_subif_start_xmit+0xd1/0x1010 net/mac80211/tx.c:4370 __netdev_start_xmit include/linux/netdevice.h:4944 [inline] netdev_start_xmit include/linux/netdevice.h:4958 [inline] xmit_one net/core/dev.c:3658 [inline] dev_hard_start_xmit+0x1a5/0x6f0 net/core/dev.c:3674 sch_direct_xmit+0x12c/0x1080 net/sched/sch_generic.c:342 __dev_xmit_skb net/core/dev.c:3874 [inline] __dev_queue_xmit+0x1100/0x2e70 net/core/dev.c:4241 neigh_output include/net/neighbour.h:510 [inline] ip6_finish_output2+0x50c/0x1410 net/ipv6/ip6_output.c:117 dst_output include/net/dst.h:448 [inline] NF_HOOK include/linux/netfilter.h:307 [inline] ndisc_send_skb+0x97e/0x1480 net/ipv6/ndisc.c:508 addrconf_rs_timer+0x24b/0x710 net/ipv6/addrconf.c:3877 call_timer_fn+0x163/0x4b0 kernel/time/timer.c:1431 expire_timers kernel/time/timer.c:1476 [inline] __run_timers.part.0+0x524/0x8a0 kernel/time/timer.c:1745 __run_timers kernel/time/timer.c:1726 [inline] run_timer_softirq+0x9c/0x190 kernel/time/timer.c:1758 __do_softirq+0x29b/0x9bd kernel/softirq.c:558 invoke_softirq kernel/softirq.c:432 [inline] __irq_exit_rcu+0x16e/0x1c0 kernel/softirq.c:636 irq_exit_rcu+0x5/0x20 kernel/softirq.c:648 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:638 RIP: 0010:native_save_fl arch/x86/include/asm/irqflags.h:29 [inline] RIP: 0010:arch_local_save_flags arch/x86/include/asm/irqflags.h:70 [inline] RIP: 0010:arch_irqs_disabled arch/x86/include/asm/irqflags.h:132 [inline] RIP: 0010:acpi_safe_halt drivers/acpi/processor_idle.c:110 [inline] RIP: 0010:acpi_idle_do_entry+0x15e/0x1c0 drivers/acpi/processor_idle.c:553 Code: 00 00 00 00 00 fc ff df 48 c1 ea 03 80 3c 02 00 75 6a 48 8b 45 00 a8 08 75 c9 e8 ad f5 1c f9 eb 07 0f 00 2d e4 86 b5 00 fb f4 <9c> 58 fa f6 c4 02 74 b1 5d e9 24 f2 1c f9 48 89 ef 5d e9 cb f9 ff RSP: 0018:ffffffff8a607d90 EFLAGS: 00000206 RAX: 00000000025c5821 RBX: ffff8880138d2065 RCX: 1ffffffff18b36f1 RDX: 0000000000000000 RSI: ffffffff88ab1e60 RDI: ffffffff88fcce20 RBP: ffffffff8a6bb380 R08: 0000000000000001 R09: 0000000000000001 R10: fffffbfff14d7670 R11: 0000000000000001 R12: 0000000000000001 R13: ffff8880138d2064 R14: ffffffff8b2b9c80 R15: ffff8881417af804 acpi_idle_enter+0x2c0/0x4b0 drivers/acpi/processor_idle.c:688 cpuidle_enter_state+0x152/0xb40 drivers/cpuidle/cpuidle.c:237 cpuidle_enter+0x45/0xa0 drivers/cpuidle/cpuidle.c:351 call_cpuidle kernel/sched/idle.c:158 [inline] cpuidle_idle_call kernel/sched/idle.c:239 [inline] do_idle+0x3e8/0x590 kernel/sched/idle.c:306 cpu_startup_entry+0x14/0x20 kernel/sched/idle.c:403 start_kernel+0x321/0x33e init/main.c:1084 secondary_startup_64_no_verify+0xb0/0xbb NMI backtrace for cpu 1 CPU: 1 PID: 24 Comm: kworker/u4:1 Not tainted 5.13.0-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 Workqueue: phy11 ieee80211_iface_work Call Trace: __dump_stack lib/dump_stack.c:79 [inline] dump_stack_lvl+0x45/0x59 lib/dump_stack.c:96 nmi_cpu_backtrace.cold+0x30/0x99 lib/nmi_backtrace.c:105 nmi_trigger_cpumask_backtrace+0x11f/0x170 lib/nmi_backtrace.c:62 trigger_single_cpu_backtrace include/linux/nmi.h:164 [inline] rcu_dump_cpu_stacks+0x25e/0x3f0 kernel/rcu/tree_stall.h:341 print_cpu_stall kernel/rcu/tree_stall.h:624 [inline] check_cpu_stall kernel/rcu/tree_stall.h:699 [inline] rcu_pending kernel/rcu/tree.c:3911 [inline] rcu_sched_clock_irq.cold+0x9f/0x747 kernel/rcu/tree.c:2649 update_process_times+0x13b/0x1c0 kernel/time/timer.c:1796 tick_sched_handle+0x6f/0x130 kernel/time/tick-sched.c:226 tick_sched_timer+0x132/0x210 kernel/time/tick-sched.c:1421 __run_hrtimer kernel/time/hrtimer.c:1537 [inline] __hrtimer_run_queues+0x18a/0xb00 kernel/time/hrtimer.c:1601 hrtimer_interrupt+0x2f9/0x920 kernel/time/hrtimer.c:1663 local_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1089 [inline] __sysvec_apic_timer_interrupt+0x146/0x530 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:638 RIP: 0010:__orc_find+0x58/0xf0 arch/x86/kernel/unwind_orc.c:50 Code: 00 00 fc ff df 49 89 fe 48 89 fd eb 0c 48 8d 6b 04 49 89 de 49 39 ec 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 RSP: 0018:ffffc90000db0698 EFLAGS: 00000202 RAX: 0000000000000000 RBX: ffffffff8c6332dc RCX: ffffffff81003b4e RDX: 0000000000000002 RSI: ffffffff8cd0922c RDI: ffffffff8c6332b4 RBP: ffffffff8c6332e0 R08: 0000000000000000 R09: ffffffff8cd0922c R10: fffff520001b6102 R11: 0000000000078087 R12: ffffffff8c6332e8 R13: ffffffff8c6332b4 R14: ffffffff8c6332dc R15: dffffc0000000000 orc_find arch/x86/kernel/unwind_orc.c:173 [inline] unwind_next_frame+0x32a/0x1ce0 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:434 [inline] __kasan_slab_alloc+0x61/0x80 mm/kasan/common.c:467 kasan_slab_alloc include/linux/kasan.h:253 [inline] slab_post_alloc_hook mm/slab.h:512 [inline] slab_alloc_node mm/slub.c:2970 [inline] kmem_cache_alloc_node+0x28b/0x4a0 mm/slub.c:3006 __alloc_skb+0x153/0x280 net/core/skbuff.c:414 skb_copy+0x10c/0x2c0 net/core/skbuff.c:1569 mac80211_hwsim_tx_frame_no_nl.isra.0+0x916/0x1020 drivers/net/wireless/mac80211_hwsim.c:1565 mac80211_hwsim_tx_frame+0x1a0/0x250 drivers/net/wireless/mac80211_hwsim.c:1784 mac80211_hwsim_beacon_tx+0x3f5/0x7b0 drivers/net/wireless/mac80211_hwsim.c:1838 __iterate_interfaces+0x107/0x360 net/mac80211/util.c:793 ieee80211_iterate_active_interfaces_atomic+0x5c/0xf0 net/mac80211/util.c:829 mac80211_hwsim_beacon+0xb7/0x160 drivers/net/wireless/mac80211_hwsim.c:1861 __run_hrtimer kernel/time/hrtimer.c:1537 [inline] __hrtimer_run_queues+0x4d7/0xb00 kernel/time/hrtimer.c:1601 hrtimer_run_softirq+0x176/0x340 kernel/time/hrtimer.c:1618 __do_softirq+0x29b/0x9bd kernel/softirq.c:558 do_softirq.part.0+0xcd/0x110 kernel/softirq.c:459 do_softirq kernel/softirq.c:451 [inline] __local_bh_enable_ip+0x102/0x120 kernel/softirq.c:383 spin_unlock_bh include/linux/spinlock.h:399 [inline] cfg80211_bss_update+0x222/0x1f30 net/wireless/scan.c:1789 cfg80211_inform_single_bss_frame_data+0x60d/0xcc0 net/wireless/scan.c:2414 cfg80211_inform_bss_frame_data+0x94/0xa80 net/wireless/scan.c:2447 ieee80211_bss_info_update+0x29d/0x8d0 net/mac80211/scan.c:190 ieee80211_rx_bss_info net/mac80211/ibss.c:1126 [inline] ieee80211_rx_mgmt_probe_beacon+0x7b7/0x1620 net/mac80211/ibss.c:1615 ieee80211_ibss_rx_queued_mgmt+0xb04/0x12b0 net/mac80211/ibss.c:1642 ieee80211_iface_process_skb net/mac80211/iface.c:1426 [inline] ieee80211_iface_work+0x5f5/0x810 net/mac80211/iface.c:1462 process_one_work+0x84c/0x13e0 kernel/workqueue.c:2276 worker_thread+0x598/0x1040 kernel/workqueue.c:2422 kthread+0x38b/0x460 kernel/kthread.c:319 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:295