rcu: INFO: rcu_preempt self-detected stall on CPU
rcu: 	1-....: (1 GPs behind) idle=cca/1/0x4000000000000002 softirq=7241/7242 fqs=4723 
	(t=10502 jiffies g=5441 q=1176)
NMI backtrace for cpu 1
CPU: 1 PID: 7858 Comm: syz-executor.1 Not tainted 5.4.0-syzkaller #0
Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS 1.10.2-1 04/01/2014
Call Trace:
 <IRQ>
 __dump_stack lib/dump_stack.c:77 [inline]
 dump_stack+0x197/0x210 lib/dump_stack.c:118
 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:2827 [inline]
 rcu_sched_clock_irq.cold+0x509/0xc02 kernel/rcu/tree.c:2271
 update_process_times+0x2d/0x70 kernel/time/timer.c:1726
 tick_sched_handle+0xa2/0x190 kernel/time/tick-sched.c:167
 tick_sched_timer+0x53/0x140 kernel/time/tick-sched.c:1310
 __run_hrtimer kernel/time/hrtimer.c:1514 [inline]
 __hrtimer_run_queues+0x364/0xe40 kernel/time/hrtimer.c:1576
 hrtimer_interrupt+0x314/0x770 kernel/time/hrtimer.c:1638
 local_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1110 [inline]
 smp_apic_timer_interrupt+0x160/0x610 arch/x86/kernel/apic/apic.c:1135
 apic_timer_interrupt+0xf/0x20 arch/x86/entry/entry_64.S:829
 </IRQ>
RIP: 0010:preempt_schedule_irq+0xab/0x160 kernel/sched/core.c:4338
Code: 00 00 e8 d8 d8 d4 f9 e8 43 b5 fe f9 4c 89 f0 48 c1 e8 03 80 3c 18 00 75 7d 48 83 3d 96 81 97 01 00 74 6f fb 66 0f 1f 44 00 00 <bf> 01 00 00 00 e8 0b d2 ff ff 48 c7 c0 60 34 13 89 48 c1 e8 03 80
RSP: 0018:ffff88806a897658 EFLAGS: 00000286 ORIG_RAX: ffffffffffffff13
RAX: 1ffffffff122668d RBX: dffffc0000000000 RCX: 0000000000000000
RDX: 0000000000000000 RSI: 0000000000000006 RDI: ffff88806abd4994
RBP: ffff88806a897678 R08: ffff88806abd4100 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000000 R12: ffffed100d57a820
R13: ffff88806abd4100 R14: ffffffff89133468 R15: 0000000000000000
 retint_kernel+0x1b/0x2b
RIP: 0010:pte_lockptr include/linux/mm.h:1909 [inline]
RIP: 0010:zap_pte_range mm/memory.c:1032 [inline]
RIP: 0010:zap_pmd_range mm/memory.c:1178 [inline]
RIP: 0010:zap_pud_range mm/memory.c:1207 [inline]
RIP: 0010:zap_p4d_range mm/memory.c:1228 [inline]
RIP: 0010:unmap_page_range+0x8a7/0x2ac0 mm/memory.c:1249
Code: ff 48 bb 00 00 00 00 00 ea ff ff 48 8b 38 e8 60 a2 ff ff 48 c1 e0 06 48 01 c3 48 8d 7b 28 48 89 f8 48 c1 e8 03 42 80 3c 28 00 <0f> 85 3b 20 00 00 48 8b 5b 28 48 8b b5 50 ff ff ff 48 8b bd 58 ff
RSP: 0018:ffff88806a897730 EFLAGS: 00000246 ORIG_RAX: ffffffffffffff13
RAX: 1ffffd40003ca785 RBX: ffffea0001e53c00 RCX: 0000000000000000
RDX: dffffc0000000000 RSI: ffffffff81a16ece RDI: ffffea0001e53c28
RBP: ffff88806a897898 R08: ffff88806abd4100 R09: ffff88806a897830
R10: ffffed100d512f07 R11: ffff88806a89783f R12: 0000000000000001
R13: dffffc0000000000 R14: 00007f142f000000 R15: 00007f142ef97000
 unmap_single_vma+0x19d/0x300 mm/memory.c:1294
 unmap_vmas+0x184/0x2f0 mm/memory.c:1326
 exit_mmap+0x2ba/0x530 mm/mmap.c:3161
 __mmput kernel/fork.c:1079 [inline]
 mmput+0x179/0x4d0 kernel/fork.c:1100
 exit_mm kernel/exit.c:485 [inline]
 do_exit+0x806/0x2ef0 kernel/exit.c:784
 do_group_exit+0x135/0x360 kernel/exit.c:895
 get_signal+0x47c/0x24f0 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:160
 prepare_exit_to_usermode arch/x86/entry/common.c:195 [inline]
 syscall_return_slowpath arch/x86/entry/common.c:278 [inline]
 do_syscall_64+0x676/0x790 arch/x86/entry/common.c:304
 entry_SYSCALL_64_after_hwframe+0x49/0xbe
RIP: 0033:0x45a759
Code: Bad RIP value.
RSP: 002b:00007f142ef32c88 EFLAGS: 00000246 ORIG_RAX: 000000000000012a
RAX: 0000000000000008 RBX: 000000000071c0f8 RCX: 000000000045a759
RDX: ffffffffffffffff RSI: 0000000000000000 RDI: 000000002001d000
RBP: 0000000000000005 R08: 0000000000000000 R09: 0000000000000000
R10: ffffffffffffffff R11: 0000000000000246 R12: 00007f142ef336d4
R13: 00000000004aec17 R14: 00000000006f1cb0 R15: 00000000ffffffff