rcu: INFO: rcu_preempt self-detected stall on CPU rcu: 0-....: (10402 ticks this GP) idle=836/1/0x4000000000000000 softirq=11642/11646 fqs=5242 (t=10500 jiffies g=12409 q=88) NMI backtrace for cpu 0 CPU: 0 PID: 9346 Comm: syz-executor678 Not tainted 5.11.0-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: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:orc_ip arch/x86/kernel/unwind_orc.c:30 [inline] RIP: 0010:__orc_find+0x83/0xf0 arch/x86/kernel/unwind_orc.c:52 Code: 01 d0 48 d1 f8 48 8d 5c 85 00 48 89 d8 48 c1 e8 03 42 0f b6 14 38 48 89 d8 83 e0 07 83 c0 03 38 d0 7c 04 84 d2 75 48 48 63 03 <48> 01 d8 48 39 c1 73 b0 4c 8d 63 fc 49 39 ec 73 b3 4d 29 ee 49 c1 RSP: 0018:ffffc900000077a0 EFLAGS: 00000246 RAX: fffffffff733411b RBX: ffffffff8de240fc RCX: ffffffff851582e4 RDX: 0000000000000000 RSI: ffffffff8e65f68c RDI: ffffffff8de240e8 RBP: ffffffff8de240e8 R08: ffffffff8e65f6d4 R09: ffffffff8e65f68c R10: 0000000000082083 R11: 00000000000d66b2 R12: ffffffff8de24114 R13: ffffffff8de240e8 R14: ffffffff8de240e8 R15: dffffc0000000000 orc_find arch/x86/kernel/unwind_orc.c:173 [inline] unwind_next_frame+0x342/0x1f90 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+0x1c/0x30 mm/kasan/common.c:46 kasan_set_free_info+0x20/0x30 mm/kasan/generic.c:356 ____kasan_slab_free+0xe1/0x110 mm/kasan/common.c:362 kasan_slab_free include/linux/kasan.h:192 [inline] slab_free_hook mm/slub.c:1547 [inline] slab_free_freelist_hook+0x5d/0x150 mm/slub.c:1580 slab_free mm/slub.c:3143 [inline] kmem_cache_free+0x82/0x350 mm/slub.c:3159 kfree_skbmem+0xef/0x1b0 net/core/skbuff.c:636 __kfree_skb net/core/skbuff.c:693 [inline] consume_skb net/core/skbuff.c:848 [inline] consume_skb+0xcf/0x160 net/core/skbuff.c:842 mac80211_hwsim_tx_frame+0x157/0x1e0 drivers/net/wireless/mac80211_hwsim.c:1706 mac80211_hwsim_beacon_tx+0x4ba/0x910 drivers/net/wireless/mac80211_hwsim.c:1759 __iterate_interfaces+0x1e5/0x520 net/mac80211/util.c:793 ieee80211_iterate_active_interfaces_atomic+0x8d/0x170 net/mac80211/util.c:829 mac80211_hwsim_beacon+0xd5/0x1a0 drivers/net/wireless/mac80211_hwsim.c:1782 __run_hrtimer kernel/time/hrtimer.c:1519 [inline] __hrtimer_run_queues+0x609/0xe40 kernel/time/hrtimer.c:1583 hrtimer_run_softirq+0x17b/0x360 kernel/time/hrtimer.c:1600 __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:pte_free include/asm-generic/pgalloc.h:102 [inline] RIP: 0010:zap_deposited_table mm/huge_memory.c:1650 [inline] RIP: 0010:zap_huge_pmd+0x610/0xe50 mm/huge_memory.c:1704 Code: 08 48 85 c0 0f 85 e8 05 00 00 e8 eb 76 ba ff ba ff ff ff ff be 25 00 00 00 4c 89 e7 e8 59 67 03 00 e8 d4 76 ba ff ff 34 24 9d <31> f6 4c 89 e7 e8 46 52 f4 ff 48 8d bb 98 00 00 00 be 08 00 00 00 RSP: 0018:ffffc90008eb7748 EFLAGS: 00000286 RAX: 0000000000000000 RBX: ffff888027f4e900 RCX: 0000000000000000 RDX: ffff88801ce09bc0 RSI: ffffffff81b85dcc RDI: 0000000000000000 RBP: ffffc90008eb7a60 R08: 0000000000000001 R09: ffffffff8f8667b7 R10: fffffbfff1f0ccf6 R11: 0000000000000000 R12: ffffea0000851080 R13: ffffea0000c88000 R14: ffff888013307ea0 R15: 0000000000000001 zap_pmd_range mm/memory.c:1355 [inline] zap_pud_range mm/memory.c:1397 [inline] zap_p4d_range mm/memory.c:1418 [inline] unmap_page_range+0x1a9a/0x2640 mm/memory.c:1439 unmap_single_vma+0x198/0x300 mm/memory.c:1484 unmap_vmas+0x168/0x2e0 mm/memory.c:1516 exit_mmap+0x2b1/0x5a0 mm/mmap.c:3220 __mmput+0x122/0x470 kernel/fork.c:1082 mmput+0x53/0x60 kernel/fork.c:1103 exit_mm kernel/exit.c:501 [inline] do_exit+0xb6a/0x2ae0 kernel/exit.c:812 do_group_exit+0x125/0x310 kernel/exit.c:922 get_signal+0x427/0x20f0 kernel/signal.c:2773 arch_do_signal_or_restart+0x2a8/0x1eb0 arch/x86/kernel/signal.c:811 handle_signal_work kernel/entry/common.c:147 [inline] exit_to_user_mode_loop kernel/entry/common.c:171 [inline] exit_to_user_mode_prepare+0x148/0x250 kernel/entry/common.c:201 __syscall_exit_to_user_mode_work kernel/entry/common.c:283 [inline] syscall_exit_to_user_mode+0x19/0x50 kernel/entry/common.c:294 entry_SYSCALL_64_after_hwframe+0x44/0xa9 RIP: 0033:0x4526c9 Code: Unable to access opcode bytes at RIP 0x45269f. RSP: 002b:00007ffce9f8fc88 EFLAGS: 00000246 ORIG_RAX: 0000000000000048 RAX: 0000000000000000 RBX: 0000000000000003 RCX: 00000000004526c9 RDX: 0000000000042000 RSI: 0000000000000004 RDI: 0000000000000003 RBP: 0000000000000000 R08: 00007ffce9f8fcd0 R09: 00007ffce9f8fcd0 R10: 0000000000000000 R11: 0000000000000246 R12: 00007ffce9f8fcbc R13: 00007ffce9f8fcd0 R14: 00007ffce9f8fd10 R15: 0000000000000285