rcu: INFO: rcu_preempt self-detected stall on CPU rcu: 1-...!: (1 GPs behind) idle=902/1/0x4000000000000000 softirq=24024/24025 fqs=28 (t=10502 jiffies g=34361 q=295) rcu: rcu_preempt kthread starved for 9219 jiffies! g34361 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:28880 pid: 11 ppid: 2 flags:0x00004000 Call Trace: context_switch kernel/sched/core.c:3779 [inline] __schedule+0x893/0x2130 kernel/sched/core.c:4528 schedule+0xcf/0x270 kernel/sched/core.c:4606 schedule_timeout+0x148/0x250 kernel/time/timer.c:1871 rcu_gp_fqs_loop kernel/rcu/tree.c:1925 [inline] rcu_gp_kthread+0xb4c/0x1c90 kernel/rcu/tree.c:2099 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: 14811 Comm: syz-executor.4 Not tainted 5.10.0-rc6-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 Call Trace: __dump_stack lib/dump_stack.c:77 [inline] dump_stack+0x107/0x163 lib/dump_stack.c:118 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+0x1e3/0x21e kernel/rcu/tree_stall.h:331 print_cpu_stall kernel/rcu/tree_stall.h:563 [inline] check_cpu_stall kernel/rcu/tree_stall.h:637 [inline] rcu_pending kernel/rcu/tree.c:3694 [inline] rcu_sched_clock_irq.cold+0x472/0xee8 kernel/rcu/tree.c:2567 update_process_times+0x77/0xd0 kernel/time/timer.c:1709 tick_sched_handle+0x9b/0x180 kernel/time/tick-sched.c:176 tick_sched_timer+0x1d1/0x2a0 kernel/time/tick-sched.c:1328 __run_hrtimer kernel/time/hrtimer.c:1519 [inline] __hrtimer_run_queues+0x1ce/0xea0 kernel/time/hrtimer.c:1583 hrtimer_interrupt+0x334/0x940 kernel/time/hrtimer.c:1645 local_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1080 [inline] __sysvec_apic_timer_interrupt+0x146/0x540 arch/x86/kernel/apic/apic.c:1097 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:1091 asm_sysvec_apic_timer_interrupt+0x12/0x20 arch/x86/include/asm/idtentry.h:631 RIP: 0010:ieee80211_rx_list+0x14f/0x23d0 net/mac80211/rx.c:4666 Code: 80 fb 04 4d 8b 6e 40 44 0f b6 e3 0f 87 13 1f 00 00 4b 8d bc e5 18 01 00 00 48 b8 00 00 00 00 00 fc ff df 48 89 fa 48 c1 ea 03 <80> 3c 02 00 0f 85 e6 1e 00 00 4f 8b a4 e5 18 01 00 00 4d 85 e4 0f RSP: 0018:ffffc90000d90cb8 EFLAGS: 00000212 RAX: dffffc0000000000 RBX: 0000000000000000 RCX: ffffffff884ebcc8 RDX: 1ffff11004d8a0d3 RSI: ffffffff884ebcd6 RDI: ffff888026c50698 RBP: ffff88806198d000 R08: 0000000000000000 R09: ffffffff8ebaf667 R10: 0000000000000004 R11: 0000000000000001 R12: 0000000000000000 R13: ffff888026c50580 R14: ffff888026c50c80 R15: 0000000000000001 ieee80211_rx_napi+0xf7/0x3d0 net/mac80211/rx.c:4780 ieee80211_rx include/net/mac80211.h:4502 [inline] ieee80211_tasklet_handler+0xd3/0x130 net/mac80211/main.c:235 tasklet_action_common.constprop.0+0x22f/0x2d0 kernel/softirq.c:560 __do_softirq+0x2a0/0x9f6 kernel/softirq.c:298 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:393 [inline] __irq_exit_rcu kernel/softirq.c:423 [inline] irq_exit_rcu+0x132/0x200 kernel/softirq.c:435 sysvec_apic_timer_interrupt+0x4d/0x100 arch/x86/kernel/apic/apic.c:1091 asm_sysvec_apic_timer_interrupt+0x12/0x20 arch/x86/include/asm/idtentry.h:631 RIP: 0010:__tlb_remove_page_size+0x8c/0x420 mm/mmu_gather.c:81 Code: c1 ea 03 80 3c 02 00 0f 85 2a 03 00 00 48 b8 00 00 00 00 00 fc ff df 48 8b 6b 28 48 8d 7d 08 48 89 fa 48 c1 ea 03 0f b6 04 02 <84> c0 74 08 3c 03 0f 8e ed 02 00 00 48 b8 00 00 00 00 00 fc ff df RSP: 0018:ffffc900017cf770 EFLAGS: 00000212 RAX: 0000000000000000 RBX: ffffc900017cfa70 RCX: ffffffff81a4a4c2 RDX: 1ffff1100567b201 RSI: ffffffff81a4a4d0 RDI: ffff88802b3d9008 RBP: ffff88802b3d9000 R08: 0000000000000000 R09: ffffea00015fabf3 R10: 0000000000000000 R11: 0000000000000000 R12: ffffea00015fabf0 R13: ffff8880145d1698 R14: ffffea00015fabc0 R15: ffffc900017cfa98 __tlb_remove_page include/asm-generic/tlb.h:438 [inline] zap_pte_range mm/memory.c:1256 [inline] zap_pmd_range mm/memory.c:1357 [inline] zap_pud_range mm/memory.c:1386 [inline] zap_p4d_range mm/memory.c:1407 [inline] unmap_page_range+0xea7/0x2640 mm/memory.c:1428 unmap_single_vma+0x198/0x300 mm/memory.c:1473 unmap_vmas+0x168/0x2e0 mm/memory.c:1505 exit_mmap+0x2b1/0x530 mm/mmap.c:3222 __mmput+0x122/0x470 kernel/fork.c:1079 mmput+0x53/0x60 kernel/fork.c:1100 exit_mm kernel/exit.c:486 [inline] do_exit+0xa72/0x29b0 kernel/exit.c:796 do_group_exit+0x125/0x310 kernel/exit.c:906 get_signal+0x42a/0x1f10 kernel/signal.c:2758 arch_do_signal+0x82/0x2390 arch/x86/kernel/signal.c:811 exit_to_user_mode_loop kernel/entry/common.c:161 [inline] exit_to_user_mode_prepare+0x100/0x1a0 kernel/entry/common.c:191 irqentry_exit_to_user_mode+0x5/0x30 kernel/entry/common.c:279 asm_sysvec_apic_timer_interrupt+0x12/0x20 arch/x86/include/asm/idtentry.h:631 RIP: 0033:0x4062b8 Code: Unable to access opcode bytes at RIP 0x40628e. RSP: 002b:00007efdf9158c80 EFLAGS: 00000217 RAX: 0000000000000000 RBX: 0000000000000003 RCX: 000000000118bf20 RDX: 0000000000000000 RSI: 0000000000000004 RDI: 0000000000000007 RBP: 000000000118bf60 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 000000000118bf2c R13: 00007ffde812a7cf R14: 00007efdf91599c0 R15: 000000000118bf2c