rcu: INFO: rcu_preempt self-detected stall on CPU
rcu: 	1-....: (1 GPs behind) idle=092/1/0x4000000000000000 softirq=289683/289685 fqs=5044 
	(t=10502 jiffies g=392761 q=6845)
NMI backtrace for cpu 1
CPU: 1 PID: 21323 Comm: syz-executor.1 Not tainted 5.12.0-rc8-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+0x202/0x31e lib/dump_stack.c:120
 nmi_cpu_backtrace+0x16c/0x190 lib/nmi_backtrace.c:105
 nmi_trigger_cpumask_backtrace+0x191/0x2f0 lib/nmi_backtrace.c:62
 trigger_single_cpu_backtrace include/linux/nmi.h:164 [inline]
 rcu_dump_cpu_stacks+0x22d/0x390 kernel/rcu/tree_stall.h:341
 print_cpu_stall kernel/rcu/tree_stall.h:622 [inline]
 check_cpu_stall kernel/rcu/tree_stall.h:697 [inline]
 rcu_pending kernel/rcu/tree.c:3830 [inline]
 rcu_sched_clock_irq+0x1cd7/0x29f0 kernel/rcu/tree.c:2650
 update_process_times+0x197/0x200 kernel/time/timer.c:1796
 tick_sched_handle kernel/time/tick-sched.c:226 [inline]
 tick_sched_timer+0x27d/0x420 kernel/time/tick-sched.c:1369
 __run_hrtimer kernel/time/hrtimer.c:1537 [inline]
 __hrtimer_run_queues+0x4cb/0xa60 kernel/time/hrtimer.c:1601
 hrtimer_interrupt+0x3b3/0x1040 kernel/time/hrtimer.c:1663
 local_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1089 [inline]
 __sysvec_apic_timer_interrupt+0xf9/0x270 arch/x86/kernel/apic/apic.c:1106
 sysvec_apic_timer_interrupt+0x3e/0xb0 arch/x86/kernel/apic/apic.c:1100
 asm_sysvec_apic_timer_interrupt+0x12/0x20 arch/x86/include/asm/idtentry.h:632
RIP: 0010:__raw_spin_unlock_irqrestore include/linux/spinlock_api_smp.h:161 [inline]
RIP: 0010:_raw_spin_unlock_irqrestore+0xbc/0x120 kernel/locking/spinlock.c:191
Code: f0 48 c1 e8 03 42 80 3c 20 00 74 08 4c 89 f7 e8 da 01 18 f8 f6 44 24 21 02 75 4e 41 f7 c7 00 02 00 00 74 01 fb bf 01 00 00 00 <e8> cf 3e a9 f7 65 8b 05 50 e5 54 76 85 c0 74 3f 48 c7 04 24 0e 36
RSP: 0018:ffffc90000dc0a60 EFLAGS: 00000206
RAX: 1ffff920001b8150 RBX: ffff88815add0908 RCX: ffffffff816123b9
RDX: dffffc0000000000 RSI: 0000000000000102 RDI: 0000000000000001
RBP: ffffc90000dc0ae8 R08: dffffc0000000000 R09: fffffbfff1f992cb
R10: fffffbfff1f992cb R11: 0000000000000000 R12: dffffc0000000000
R13: 1ffff920001b814c R14: ffffc90000dc0a80 R15: 0000000000000a02
 spin_unlock_irqrestore include/linux/spinlock.h:409 [inline]
 skb_dequeue+0x10e/0x140 net/core/skbuff.c:3096
 mrp_queue_xmit net/802/mrp.c:350 [inline]
 mrp_join_timer+0x559/0x7b0 net/802/mrp.c:595
 call_timer_fn+0xf6/0x210 kernel/time/timer.c:1431
 expire_timers kernel/time/timer.c:1476 [inline]
 __run_timers+0x6ff/0x910 kernel/time/timer.c:1745
 run_timer_softirq+0x63/0xf0 kernel/time/timer.c:1758
 __do_softirq+0x372/0x7a6 kernel/softirq.c:345
 invoke_softirq kernel/softirq.c:221 [inline]
 __irq_exit_rcu+0x22c/0x260 kernel/softirq.c:422
 irq_exit_rcu+0x5/0x20 kernel/softirq.c:434
 sysvec_apic_timer_interrupt+0x91/0xb0 arch/x86/kernel/apic/apic.c:1100
 </IRQ>
 asm_sysvec_apic_timer_interrupt+0x12/0x20 arch/x86/include/asm/idtentry.h:632
RIP: 0010:instrument_atomic_read include/linux/instrumented.h:71 [inline]
RIP: 0010:atomic_read include/asm-generic/atomic-instrumented.h:27 [inline]
RIP: 0010:lock_page_memcg+0x1e2/0x330 mm/memcontrol.c:2157
Code: 24 10 80 3c 01 00 74 0a 48 8d 7c 24 40 e8 16 cf fa ff f6 44 24 41 02 75 6f 41 f7 c7 00 02 00 00 74 01 fb 49 8d 9d 00 0c 00 00 <48> 89 df be 04 00 00 00 e8 91 d0 fa ff 48 89 d8 48 c1 e8 03 48 b9
RSP: 0018:ffffc90023ca7260 EFLAGS: 00000206
RAX: dffffc0000000000 RBX: ffff888140730c00 RCX: 1ffff92004794e54
RDX: dffffc0000000000 RSI: 0000000000000001 RDI: 0000000000000000
RBP: ffffc90023ca7330 R08: dffffc0000000000 R09: fffffbfff1f992b3
R10: fffffbfff1f992b3 R11: 0000000000000000 R12: ffff888140730000
R13: ffff888140730000 R14: ffffea0000c48d80 R15: 0000000000000286
 page_remove_rmap+0x2b/0x1080 mm/rmap.c:1348
 zap_pte_range+0x92a/0x1b60 mm/memory.c:1270
 zap_pmd_range mm/memory.c:1374 [inline]
 zap_pud_range mm/memory.c:1403 [inline]
 zap_p4d_range mm/memory.c:1424 [inline]
 unmap_page_range+0x55a/0x890 mm/memory.c:1445
 unmap_vmas+0x1d1/0x360 mm/memory.c:1522
 exit_mmap+0x2af/0x5f0 mm/mmap.c:3218
 __mmput+0x111/0x370 kernel/fork.c:1090
 exit_mm+0x67e/0x7d0 kernel/exit.c:501
 do_exit+0x6b9/0x23d0 kernel/exit.c:812
 do_group_exit+0x168/0x2d0 kernel/exit.c:922
 get_signal+0x16d0/0x20e0 kernel/signal.c:2781
 arch_do_signal_or_restart+0x8e/0x6c0 arch/x86/kernel/signal.c:789
 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+0xac/0x1e0 kernel/entry/common.c:208
 __syscall_exit_to_user_mode_work kernel/entry/common.c:290 [inline]
 syscall_exit_to_user_mode+0x26/0x70 kernel/entry/common.c:301
 entry_SYSCALL_64_after_hwframe+0x44/0xae
RIP: 0033:0x4665f9
Code: Unable to access opcode bytes at RIP 0x4665cf.
RSP: 002b:00007ffc2f86a0c8 EFLAGS: 00000246 ORIG_RAX: 00000000000000ca
RAX: 0000000000000000 RBX: 0000000000000032 RCX: 00000000004665f9
RDX: 0000000000000000 RSI: 0000000000000080 RDI: 000000000056bf6c
RBP: 000000000056bf6c R08: 0000000000000010 R09: 0000000000000000
R10: 00007ffc2f86a1a0 R11: 0000000000000246 R12: 000000000020b54a
R13: 00000000000003e8 R14: 000000000056bf60 R15: 000000000020b540