rcu: INFO: rcu_preempt self-detected stall on CPU
rcu: 	1-....: (10007 ticks this GP) idle=b86/1/0x4000000000000000 softirq=13127/13130 fqs=2645 
	(t=10502 jiffies g=12121 q=744)
NMI backtrace for cpu 1
CPU: 1 PID: 10228 Comm: syz-executor525 Not tainted 5.11.0-rc5-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: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:1085 [inline]
 __sysvec_apic_timer_interrupt+0x146/0x540 arch/x86/kernel/apic/apic.c:1102
 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:1096
 asm_sysvec_apic_timer_interrupt+0x12/0x20 arch/x86/include/asm/idtentry.h:629
RIP: 0010:unwind_next_frame+0x367/0x1f90 arch/x86/kernel/unwind_orc.c:456
Code: e8 7e f5 ff ff 49 89 c0 4d 85 c0 0f 84 56 02 00 00 4d 8d 48 04 48 b8 00 00 00 00 00 fc ff df 4c 89 ca 48 c1 ea 03 0f b6 04 02 <4c> 89 ca 83 e2 07 38 d0 7f 08 84 c0 0f 85 6f 08 00 00 41 0f b6 40
RSP: 0018:ffffc90000db0668 EFLAGS: 00000212
RAX: 0000000000000000 RBX: 1ffff920001b60d5 RCX: ffffffff81b561aa
RDX: 1ffffffff1b0aa4c RSI: ffffffff8d8551f2 RDI: ffffffff8d1724d4
RBP: 0000000000000002 R08: ffffffff8d85525e R09: ffffffff8d855262
R10: 0000000000082083 R11: 000000000002a2b7 R12: ffffc90000db0788
R13: ffffc90000db0775 R14: ffffc90000db0790 R15: ffffc90000db0740
 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:401 [inline]
 ____kasan_kmalloc.constprop.0+0x82/0xa0 mm/kasan/common.c:429
 kasan_slab_alloc include/linux/kasan.h:209 [inline]
 slab_post_alloc_hook mm/slab.h:512 [inline]
 slab_alloc_node mm/slub.c:2892 [inline]
 __kmalloc_node_track_caller+0x1e0/0x3f0 mm/slub.c:4496
 __kmalloc_reserve net/core/skbuff.c:142 [inline]
 __alloc_skb+0xae/0x5a0 net/core/skbuff.c:210
 __netdev_alloc_skb+0x70/0x400 net/core/skbuff.c:446
 netdev_alloc_skb include/linux/skbuff.h:2832 [inline]
 dev_alloc_skb include/linux/skbuff.h:2845 [inline]
 __ieee80211_beacon_get+0xebe/0x1aa0 net/mac80211/tx.c:4814
 ieee80211_beacon_get_tim+0x88/0x910 net/mac80211/tx.c:4928
 ieee80211_beacon_get include/net/mac80211.h:4918 [inline]
 mac80211_hwsim_beacon_tx+0x111/0x910 drivers/net/wireless/mac80211_hwsim.c:1729
 __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+0x2bc/0xa29 kernel/softirq.c:343
 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: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:1096
 asm_sysvec_apic_timer_interrupt+0x12/0x20 arch/x86/include/asm/idtentry.h:629
RIP: 0010:constant_test_bit arch/x86/include/asm/bitops.h:207 [inline]
RIP: 0010:test_bit include/asm-generic/bitops/instrumented-non-atomic.h:135 [inline]
RIP: 0010:test_ti_thread_flag include/linux/thread_info.h:102 [inline]
RIP: 0010:need_resched include/linux/sched.h:1917 [inline]
RIP: 0010:preempt_schedule_common+0x19/0xc0 kernel/sched/core.c:5246
Code: 3f ba f8 e9 78 ff ff ff 66 0f 1f 84 00 00 00 00 00 41 55 41 54 49 bc 00 00 00 00 00 fc ff df 55 53 65 48 8b 1c 25 00 f0 01 00 <48> 89 dd 48 c1 ed 03 4c 01 e5 65 ff 05 26 b3 06 77 65 8b 05 1f b3
RSP: 0018:ffffc9000b547988 EFLAGS: 00000202
RAX: 0000000000000246 RBX: ffff88802b5b1bc0 RCX: 0000000000000000
RDX: ffff88802b5b1bc0 RSI: ffffffff819a674e RDI: 0000000000000003
RBP: ffffc9000b5479f8 R08: 0000000000000000 R09: 0000000000000000
R10: ffffffff819a65f2 R11: 0000000000000000 R12: dffffc0000000000
R13: ffff8880b9f30dc8 R14: ffff88802b5b1bc0 R15: ffff888023f82300
 preempt_schedule_thunk+0x16/0x18 arch/x86/entry/thunk_64.S:40
 lru_add_drain+0x373/0x430 mm/swap.c:721
 exit_mmap+0x27a/0x5a0 mm/mmap.c:3215
 __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:291 [inline]
 syscall_exit_to_user_mode+0x19/0x50 kernel/entry/common.c:302
 entry_SYSCALL_64_after_hwframe+0x44/0xa9
RIP: 0033:0x44ad59
Code: Unable to access opcode bytes at RIP 0x44ad2f.
RSP: 002b:00007fba68554cf8 EFLAGS: 00000246 ORIG_RAX: 00000000000000ca
RAX: 0000000000000000 RBX: 00000000006e1c28 RCX: 000000000044ad59
RDX: 00000000000f4240 RSI: 0000000000000081 RDI: 00000000006e1c2c
RBP: 00000000006e1c20 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 00000000006e1c2c
R13: 00007ffc917c051f R14: 00007fba685559c0 R15: 20c49ba5e353f7cf