rcu: INFO: rcu_preempt self-detected stall on CPU
rcu: 	1-....: (10048 ticks this GP) idle=cde/1/0x4000000000000000 softirq=10858/10860 fqs=191 
	(t=10500 jiffies g=8689 q=82)
NMI backtrace for cpu 1
CPU: 1 PID: 8879 Comm: syz-executor587 Not tainted 5.10.0-rc7-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
Call Trace:
 <IRQ>
 __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:__read_once_word_nocheck+0x3/0x10 include/asm-generic/rwonce.h:68
Code: 48 c7 c7 60 64 1b 8b e8 1b ea 9e 02 e9 60 fb ff ff e8 11 b4 81 00 e9 cf fb ff ff cc cc cc cc cc cc cc cc cc cc cc cc 48 8b 07 <c3> 66 90 66 2e 0f 1f 84 00 00 00 00 00 41 57 89 d0 41 56 41 55 41
RSP: 0018:ffffc90000d90640 EFLAGS: 00000246
RAX: ffffffff8126823a RBX: ffffc90000d90798 RCX: ffffc90000d90798
RDX: dffffc0000000000 RSI: 0000000000000001 RDI: ffffc9000268f5e8
RBP: ffffc9000268f5e8 R08: 0000000000000000 R09: ffffffff8df5db76
R10: 0000000000082081 R11: 0000000000000001 R12: ffffc90000d90750
R13: ffffc90000d89000 R14: ffffc90000d907a0 R15: ffffc90000d90750
 deref_stack_reg+0xee/0x150 arch/x86/kernel/unwind_orc.c:355
 unwind_next_frame+0xc3b/0x1f90 arch/x86/kernel/unwind_orc.c:531
 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:48
 kasan_set_track mm/kasan/common.c:56 [inline]
 __kasan_kmalloc.constprop.0+0xc2/0xd0 mm/kasan/common.c:461
 slab_post_alloc_hook mm/slab.h:535 [inline]
 slab_alloc_node mm/slub.c:2891 [inline]
 slab_alloc mm/slub.c:2899 [inline]
 kmem_cache_alloc+0x1c6/0x440 mm/slub.c:2904
 __build_skb+0x21/0x60 net/core/skbuff.c:311
 __netdev_alloc_skb+0x20d/0x3f0 net/core/skbuff.c:464
 netdev_alloc_skb include/linux/skbuff.h:2826 [inline]
 dev_alloc_skb include/linux/skbuff.h:2839 [inline]
 __ieee80211_beacon_get+0xebe/0x1aa0 net/mac80211/tx.c:4837
 ieee80211_beacon_get_tim+0x88/0x910 net/mac80211/tx.c:4951
 ieee80211_beacon_get include/net/mac80211.h:4912 [inline]
 mac80211_hwsim_beacon_tx+0x111/0x910 drivers/net/wireless/mac80211_hwsim.c:1729
 __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
 </IRQ>
 __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:__raw_spin_unlock_irq include/linux/spinlock_api_smp.h:169 [inline]
RIP: 0010:_raw_spin_unlock_irq+0x25/0x40 kernel/locking/spinlock.c:199
Code: 0f 1f 44 00 00 55 48 8b 74 24 08 48 89 fd 48 83 c7 18 e8 3e 29 6e f8 48 89 ef e8 c6 dd 6e f8 e8 81 c7 8d f8 fb bf 01 00 00 00 <e8> d6 49 63 f8 65 8b 05 ff f3 19 77 85 c0 74 02 5d c3 e8 9b 49 18
RSP: 0018:ffffc9000268f6e8 EFLAGS: 00000202
RAX: 00000000002f71b3 RBX: ffff888020b23480 RCX: 1ffffffff19d8e91
RDX: 0000000000000000 RSI: 0000000000000002 RDI: 0000000000000001
RBP: ffff8880b9f34940 R08: 0000000000000001 R09: 0000000000000001
R10: 0000000000000000 R11: 0000000000000000 R12: ffff8880b9f34940
R13: ffff88801d72b480 R14: 0000000000000000 R15: 0000000000000001
 finish_lock_switch kernel/sched/core.c:3518 [inline]
 finish_task_switch+0x150/0x7a0 kernel/sched/core.c:3618
 context_switch kernel/sched/core.c:3782 [inline]
 __schedule+0x89b/0x2130 kernel/sched/core.c:4528
 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:compound_head include/linux/page-flags.h:187 [inline]
RIP: 0010:release_pages+0xfc/0x1690 mm/swap.c:892
Code: 83 c6 08 4c 01 f8 48 89 44 24 10 e8 3e 13 da ff 49 8d 7d 08 48 89 f8 48 c1 e8 03 42 80 3c 38 00 0f 85 f9 11 00 00 49 8b 45 08 <31> ff 48 89 c3 48 89 44 24 08 83 e3 01 48 89 de e8 7f 0b da ff 48
RSP: 0018:ffffc9000268f8f0 EFLAGS: 00000246
RAX: ffffea0000ae9a88 RBX: 00000000000000b6 RCX: ffffffff8195f4f3
RDX: ffff888020b23480 RSI: ffffffff8195f132 RDI: ffffea0000b79c08
RBP: 0000000000000000 R08: 0000000000000001 R09: ffffea0000ae9ab7
R10: 00000000000000b6 R11: 0000000000000000 R12: 0000000000000038
R13: ffffea0000b79c00 R14: ffff888013e8d1d8 R15: dffffc0000000000
 tlb_batch_pages_flush mm/mmu_gather.c:49 [inline]
 tlb_flush_mmu_free mm/mmu_gather.c:242 [inline]
 tlb_flush_mmu mm/mmu_gather.c:249 [inline]
 tlb_finish_mmu+0x165/0x8c0 mm/mmu_gather.c:328
 exit_mmap+0x2d1/0x530 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
 syscall_exit_to_user_mode+0x38/0x260 kernel/entry/common.c:266
 entry_SYSCALL_64_after_hwframe+0x44/0xa9
RIP: 0033:0x447ad9
Code: Unable to access opcode bytes at RIP 0x447aaf.
RSP: 002b:00007f0e9fe7adb8 EFLAGS: 00000246 ORIG_RAX: 00000000000000ca
RAX: fffffffffffffe00 RBX: 00000000006dcc28 RCX: 0000000000447ad9
RDX: 0000000000000000 RSI: 0000000000000080 RDI: 00000000006dcc28
RBP: 00000000006dcc20 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 00000000006dcc2c
R13: 00007ffd8baf43cf R14: 00007f0e9fe7b9c0 R15: 0000000000000064