rcu: INFO: rcu_preempt self-detected stall on CPU
rcu: 	1-....: (1 GPs behind) idle=79a/1/0x4000000000000004 softirq=161616/161617 fqs=5236 
	(t=10500 jiffies g=177825 q=393)
NMI backtrace for cpu 1
CPU: 1 PID: 19476 Comm: syz-executor.3 Not tainted 5.3.0-rc8+ #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+0x172/0x1f0 lib/dump_stack.c:113
 nmi_cpu_backtrace.cold+0x70/0xb2 lib/nmi_backtrace.c:101
 nmi_trigger_cpumask_backtrace+0x23b/0x28b lib/nmi_backtrace.c:62
 arch_trigger_cpumask_backtrace+0x14/0x20 arch/x86/kernel/apic/hw_nmi.c:38
 trigger_single_cpu_backtrace include/linux/nmi.h:164 [inline]
 rcu_dump_cpu_stacks+0x183/0x1cf kernel/rcu/tree_stall.h:254
 print_cpu_stall kernel/rcu/tree_stall.h:455 [inline]
 check_cpu_stall kernel/rcu/tree_stall.h:529 [inline]
 rcu_pending kernel/rcu/tree.c:2736 [inline]
 rcu_sched_clock_irq.cold+0x4dd/0xc13 kernel/rcu/tree.c:2183
 update_process_times+0x32/0x80 kernel/time/timer.c:1639
 tick_sched_handle+0xa2/0x190 kernel/time/tick-sched.c:167
 tick_sched_timer+0x53/0x140 kernel/time/tick-sched.c:1296
 __run_hrtimer kernel/time/hrtimer.c:1389 [inline]
 __hrtimer_run_queues+0x364/0xe40 kernel/time/hrtimer.c:1451
 hrtimer_interrupt+0x314/0x770 kernel/time/hrtimer.c:1509
 local_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1106 [inline]
 smp_apic_timer_interrupt+0x160/0x610 arch/x86/kernel/apic/apic.c:1131
 apic_timer_interrupt+0xf/0x20 arch/x86/entry/entry_64.S:830
RIP: 0010:__raw_spin_unlock_irq include/linux/spinlock_api_smp.h:169 [inline]
RIP: 0010:_raw_spin_unlock_irq+0x54/0x90 kernel/locking/spinlock.c:199
Code: c0 60 f4 d2 88 48 ba 00 00 00 00 00 fc ff df 48 c1 e8 03 80 3c 10 00 75 33 48 83 3d 75 ce 94 01 00 74 20 fb 66 0f 1f 44 00 00 <bf> 01 00 00 00 e8 92 9b 10 fa 65 8b 05 03 d8 c3 78 85 c0 74 06 41
RSP: 0018:ffff8880ae909dd0 EFLAGS: 00000282 ORIG_RAX: ffffffffffffff13
RAX: 1ffffffff11a5e8c RBX: ffffffff85c68780 RCX: 1ffffffff134b5ee
RDX: dffffc0000000000 RSI: ffffffff8177f14e RDI: ffffffff873e25c8
RBP: ffff8880ae909dd8 R08: ffff888024124380 R09: ffffed1015d24981
R10: ffffed1015d24980 R11: ffff8880ae924c03 R12: ffff8880ae924c00
R13: ffff888213559e48 R14: ffff8880ae924c00 R15: dffffc0000000000
 expire_timers kernel/time/timer.c:1365 [inline]
 __run_timers kernel/time/timer.c:1685 [inline]
 __run_timers kernel/time/timer.c:1653 [inline]
 run_timer_softirq+0x685/0x17a0 kernel/time/timer.c:1698
 __do_softirq+0x262/0x98c kernel/softirq.c:292
 invoke_softirq kernel/softirq.c:373 [inline]
 irq_exit+0x19b/0x1e0 kernel/softirq.c:413
 exiting_irq arch/x86/include/asm/apic.h:537 [inline]
 smp_apic_timer_interrupt+0x1a3/0x610 arch/x86/kernel/apic/apic.c:1133
 apic_timer_interrupt+0xf/0x20 arch/x86/entry/entry_64.S:830
 </IRQ>
RIP: 0010:lock_acquire+0xe/0x410 kernel/locking/lockdep.c:4401
Code: e9 29 fc ff ff 48 c7 c7 70 af a5 89 e8 9b c1 53 00 e9 20 fd ff ff 66 0f 1f 44 00 00 48 b8 00 00 00 00 00 fc ff df 55 48 89 e5 <41> 57 41 89 cf 41 56 41 89 d6 41 55 41 89 f5 41 54 49 89 fc 65 48
RSP: 0018:ffff888210b8f680 EFLAGS: 00000246 ORIG_RAX: ffffffffffffff13
RAX: dffffc0000000000 RBX: ffffea00024ee3c0 RCX: 0000000000000002
RDX: 0000000000000000 RSI: 0000000000000000 RDI: ffffffff88dac3c0
RBP: ffff888210b8f680 R08: 0000000000000000 R09: 0000000000000000
R10: fffff9400049dc78 R11: ffffea00024ee3c7 R12: ffffea00024ee3c0
R13: 0000000000000000 R14: ffffea00024ee3c8 R15: dead000000000100
 rcu_lock_acquire include/linux/rcupdate.h:208 [inline]
 rcu_read_lock include/linux/rcupdate.h:592 [inline]
 lock_page_memcg+0x39/0x240 mm/memcontrol.c:2086
 page_remove_file_rmap mm/rmap.c:1218 [inline]
 page_remove_rmap+0x5d6/0x1190 mm/rmap.c:1303
 zap_pte_range mm/memory.c:1059 [inline]
 zap_pmd_range mm/memory.c:1161 [inline]
 zap_pud_range mm/memory.c:1190 [inline]
 zap_p4d_range mm/memory.c:1211 [inline]
 unmap_page_range+0xd45/0x2170 mm/memory.c:1232
 unmap_single_vma+0x19d/0x300 mm/memory.c:1277
 unmap_vmas+0x135/0x280 mm/memory.c:1309
 exit_mmap+0x2ba/0x530 mm/mmap.c:3145
 __mmput kernel/fork.c:1064 [inline]
 mmput+0x179/0x4d0 kernel/fork.c:1085
 exit_mm kernel/exit.c:547 [inline]
 do_exit+0x84e/0x2e50 kernel/exit.c:866
 do_group_exit+0x135/0x360 kernel/exit.c:983
 get_signal+0x47c/0x2500 kernel/signal.c:2734
 do_signal+0x87/0x1700 arch/x86/kernel/signal.c:815
 exit_to_usermode_loop+0x286/0x380 arch/x86/entry/common.c:159
 prepare_exit_to_usermode arch/x86/entry/common.c:194 [inline]
 syscall_return_slowpath arch/x86/entry/common.c:274 [inline]
 do_syscall_64+0x5a9/0x6a0 arch/x86/entry/common.c:299
 entry_SYSCALL_64_after_hwframe+0x49/0xbe
RIP: 0033:0x4598e9
Code: Bad RIP value.
RSP: 002b:00007fab57286c78 EFLAGS: 00000246 ORIG_RAX: 0000000000000141
RAX: fffffffffffffff5 RBX: 0000000000000003 RCX: 00000000004598e9
RDX: 0000000000000070 RSI: 0000000020000180 RDI: 0000000000000005
RBP: 000000000075bf20 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 00007fab572876d4
R13: 00000000004bfd15 R14: 00000000004d1a58 R15: 00000000ffffffff