rcu: INFO: rcu_preempt self-detected stall on CPU rcu: 0-...!: (10089 ticks this GP) idle=b4a/1/0x4000000000000000 softirq=10312/10313 fqs=82 (t=10501 jiffies g=10101 q=374) rcu: rcu_preempt kthread starved for 5711 jiffies! g10101 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: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 0 CPU: 0 PID: 9902 Comm: syz-executor022 Not tainted 5.10.0-rc7-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:mac80211_hwsim_tx_frame_no_nl.isra.0+0x737/0x1330 drivers/net/wireless/mac80211_hwsim.c:1445 Code: b6 44 24 08 84 c0 0f 85 a8 06 00 00 e8 62 97 60 fc e8 5d 97 60 fc 48 89 d8 48 c1 e8 03 80 3c 28 00 0f 85 93 09 00 00 48 8b 1b <48> 81 fb 40 d4 ff 8b 0f 84 f7 04 00 00 e8 37 97 60 fc 49 39 de 4c RSP: 0018:ffffc90000007b88 EFLAGS: 00000246 RAX: 1ffff11004564624 RBX: ffff88801b8cb120 RCX: ffffffff850f6ef3 RDX: ffff888017569a40 RSI: ffffffff850f6d13 RDI: 0000000000000004 RBP: dffffc0000000000 R08: 0000000000000001 R09: 0000000000000003 R10: 0000000000000001 R11: 0000000000000001 R12: ffff888010f04a00 R13: ffff88802263b350 R14: ffff88802263b120 R15: 0000000000000004 mac80211_hwsim_tx_frame+0x14f/0x1e0 drivers/net/wireless/mac80211_hwsim.c:1705 mac80211_hwsim_beacon_tx+0x4ba/0x910 drivers/net/wireless/mac80211_hwsim.c:1759 __iterate_interfaces+0x1e5/0x520 net/mac80211/util.c:792 ieee80211_iterate_active_interfaces_atomic+0x8d/0x170 net/mac80211/util.c:828 mac80211_hwsim_beacon+0xd5/0x1a0 drivers/net/wireless/mac80211_hwsim.c:1782 __run_hrtimer kernel/time/hrtimer.c:1519 [inline] __hrtimer_run_queues+0x693/0xea0 kernel/time/hrtimer.c:1583 hrtimer_run_softirq+0x17b/0x360 kernel/time/hrtimer.c:1600 __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:__schedule+0x42/0x2130 kernel/sched/core.c:4411 Code: e8 03 41 55 41 54 48 89 c1 4d 89 fc 53 89 fb 48 81 ec a0 00 00 00 48 89 85 38 ff ff ff 48 b8 00 00 00 00 00 fc ff df 48 01 c8 <48> c7 45 80 7f b9 c5 8a 48 c7 85 78 ff ff ff b3 8a b5 41 48 c7 45 RSP: 0018:ffffc9000ab8f5f0 EFLAGS: 00000286 RAX: fffff52001571ec6 RBX: 0000000000000001 RCX: 1ffff92001571ec6 RDX: 0000000000000000 RSI: 0000000000000001 RDI: 0000000000000001 RBP: ffffc9000ab8f6b8 R08: 0000000000000001 R09: 0000000000000001 R10: 0000000000000000 R11: 0000000000000001 R12: 0000000000034980 R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000034980 preempt_schedule_irq+0x4e/0x90 kernel/sched/core.c:4789 irqentry_exit_cond_resched kernel/entry/common.c:357 [inline] irqentry_exit_cond_resched kernel/entry/common.c:349 [inline] irqentry_exit+0x7a/0xa0 kernel/entry/common.c:387 asm_sysvec_apic_timer_interrupt+0x12/0x20 arch/x86/include/asm/idtentry.h:631 RIP: 0010:__sanitizer_cov_trace_cmp8+0x4/0x20 kernel/kcov.c:263 Code: 84 00 00 00 00 00 48 8b 0c 24 89 f2 89 fe bf 04 00 00 00 e9 2e ff ff ff 0f 1f 40 00 66 2e 0f 1f 84 00 00 00 00 00 48 8b 0c 24 <48> 89 f2 48 89 fe bf 06 00 00 00 e9 0c ff ff ff 66 90 66 2e 0f 1f RSP: 0018:ffffc9000ab8f790 EFLAGS: 00000293 RAX: 0000000000000000 RBX: 00000000004e0000 RCX: ffffffff81a14a41 RDX: ffff888017569a40 RSI: 0000000000421000 RDI: 00000000004e0000 RBP: 0000000000000004 R08: 0000000000000000 R09: ffff88801c82c183 R10: ffffed1003905830 R11: 0000000000000000 R12: ffff888032ede250 R13: 0000000000000000 R14: dffffc0000000000 R15: 0000000000421000 zap_pte_range mm/memory.c:1322 [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+0xfb1/0x2640 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:3220 __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 syscall_exit_to_user_mode+0x38/0x260 kernel/entry/common.c:266 entry_SYSCALL_64_after_hwframe+0x44/0xa9 RIP: 0033:0x44b069 Code: Unable to access opcode bytes at RIP 0x44b03f. RSP: 002b:00007f686e50ddb8 EFLAGS: 00000246 ORIG_RAX: 00000000000000ca RAX: fffffffffffffe00 RBX: 00000000006e79e8 RCX: 000000000044b069 RDX: 0000000000000000 RSI: 0000000000000080 RDI: 00000000006e79e8 RBP: 00000000006e79e0 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 00000000006e79ec R13: 00007ffebc4d2a6f R14: 00007f686e50e9c0 R15: 20c49ba5e353f7cf