vkms_vblank_simulate: vblank timer overrun
rcu: INFO: rcu_preempt detected stalls on CPUs/tasks:
rcu: 	0-...!: (1 ticks this GP) idle=ee8c/1/0x4000000000000000 softirq=102519/102519 fqs=0
rcu: 	(detected by 1, t=10502 jiffies, g=100933, q=507 ncpus=2)
Sending NMI from CPU 1 to CPUs 0:
NMI backtrace for cpu 0
CPU: 0 PID: 13750 Comm: syz-executor.3 Not tainted 6.9.0-rc4-syzkaller-00214-g13a2e429f644 #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 03/27/2024
RIP: 0010:__lock_acquire+0x63/0x1fd0 kernel/locking/lockdep.c:5005
Code: 00 00 00 00 00 fc ff df 0f b6 04 30 84 c0 0f 85 4b 16 00 00 83 3d e8 92 36 0e 00 0f 84 1c 11 00 00 83 3d 7f 94 ad 0c 00 74 2c <4c> 89 e0 48 c1 e8 03 80 3c 30 00 74 12 4c 89 e7 e8 b8 e1 87 00 48
RSP: 0018:ffffc90000007a70 EFLAGS: 00000002
RAX: 0000000000000000 RBX: 0000000000000000 RCX: 0000000000000000
RDX: 0000000000000000 RSI: dffffc0000000000 RDI: ffff8880b942c898
RBP: 0000000000000000 R08: 0000000000000001 R09: 0000000000000001
R10: dffffc0000000000 R11: fffffbfff1f51c2e R12: ffff8880b942c898
R13: 0000000000000001 R14: ffff888025a20000 R15: 0000000000000000
FS:  0000000000000000(0000) GS:ffff8880b9400000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007fd926e1cfe4 CR3: 0000000055892000 CR4: 00000000003506f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 <NMI>
 </NMI>
 <IRQ>
 lock_acquire+0x1ed/0x550 kernel/locking/lockdep.c:5754
 __raw_spin_lock_irq include/linux/spinlock_api_smp.h:119 [inline]
 _raw_spin_lock_irq+0xd3/0x120 kernel/locking/spinlock.c:170
 __run_hrtimer kernel/time/hrtimer.c:1696 [inline]
 __hrtimer_run_queues+0x67a/0xd50 kernel/time/hrtimer.c:1756
 hrtimer_interrupt+0x396/0x990 kernel/time/hrtimer.c:1818
 local_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1032 [inline]
 __sysvec_apic_timer_interrupt+0x110/0x3f0 arch/x86/kernel/apic/apic.c:1049
 instr_sysvec_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1043 [inline]
 sysvec_apic_timer_interrupt+0xa1/0xc0 arch/x86/kernel/apic/apic.c:1043
 </IRQ>
 <TASK>
 asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:702
RIP: 0010:lock_acquire+0x10c/0x550 kernel/locking/lockdep.c:5727
Code: 00 84 c0 75 0d 80 3d 2f f7 20 0e 00 0f 84 f9 02 00 00 48 c7 c0 bc 14 a9 8f 48 c1 e8 03 42 0f b6 04 28 84 c0 0f 85 ff 02 00 00 <83> 3d d9 98 36 0e 00 0f 84 42 01 00 00 65 8b 05 90 0e 90 7e 85 c0
RSP: 0018:ffffc90003baf140 EFLAGS: 00000246
RAX: 0000000000000000 RBX: 0000000000000000 RCX: ffffffff81727ba4
RDX: 0000000000000000 RSI: ffffffff8c1f8540 RDI: ffffffff8c1f8500
RBP: ffffc90003baf288 R08: ffffffff8fa8e16f R09: 1ffffffff1f51c2d
R10: dffffc0000000000 R11: fffffbfff1f51c2e R12: 1ffff92000775e30
R13: dffffc0000000000 R14: 0000000000000000 R15: ffff88813fff9080
 rcu_lock_acquire include/linux/rcupdate.h:329 [inline]
 rcu_read_lock_sched include/linux/rcupdate.h:873 [inline]
 pfn_valid+0x113/0x440 include/linux/mmzone.h:2019
 page_table_check_clear+0x21/0x730 mm/page_table_check.c:68
 get_and_clear_full_ptes include/linux/pgtable.h:634 [inline]
 zap_present_folio_ptes mm/memory.c:1479 [inline]
 zap_present_ptes mm/memory.c:1563 [inline]
 zap_pte_range mm/memory.c:1605 [inline]
 zap_pmd_range mm/memory.c:1722 [inline]
 zap_pud_range mm/memory.c:1751 [inline]
 zap_p4d_range mm/memory.c:1772 [inline]
 unmap_page_range+0x31b0/0x4820 mm/memory.c:1793
 unmap_vmas+0x3cc/0x5f0 mm/memory.c:1883
 exit_mmap+0x2cb/0xd60 mm/mmap.c:3267
 __mmput+0x115/0x3c0 kernel/fork.c:1346
 exit_mm+0x220/0x310 kernel/exit.c:569
 do_exit+0x99e/0x27e0 kernel/exit.c:865
 do_group_exit+0x207/0x2c0 kernel/exit.c:1027
 get_signal+0x16a1/0x1740 kernel/signal.c:2911
 arch_do_signal_or_restart+0x96/0x860 arch/x86/kernel/signal.c:310
 exit_to_user_mode_loop kernel/entry/common.c:111 [inline]
 exit_to_user_mode_prepare include/linux/entry-common.h:328 [inline]
 __syscall_exit_to_user_mode_work kernel/entry/common.c:207 [inline]
 syscall_exit_to_user_mode+0xc9/0x370 kernel/entry/common.c:218
 do_syscall_64+0x102/0x240 arch/x86/entry/common.c:89
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f982527dea9
Code: Unable to access opcode bytes at 0x7f982527de7f.
RSP: 002b:00007f9825f8a178 EFLAGS: 00000246 ORIG_RAX: 00000000000000ca
RAX: fffffffffffffe00 RBX: 00007f98253abf88 RCX: 00007f982527dea9
RDX: 0000000000000000 RSI: 0000000000000080 RDI: 00007f98253abf88
RBP: 00007f98253abf80 R08: 00007f9825f8a6c0 R09: 00007f9825f8a6c0
R10: 0000000000000000 R11: 0000000000000246 R12: 00007f98253abf8c
R13: 000000000000000b R14: 00007f98254cf910 R15: 00007f98254cf9f8
 </TASK>
rcu: rcu_preempt kthread timer wakeup didn't happen for 10501 jiffies! g100933 f0x0 RCU_GP_WAIT_FQS(5) ->state=0x402
rcu: 	Possible timer handling issue on cpu=0 timer-softirq=47268
rcu: rcu_preempt kthread starved for 10502 jiffies! g100933 f0x0 RCU_GP_WAIT_FQS(5) ->state=0x402 ->cpu=0
rcu: 	Unless rcu_preempt kthread gets sufficient CPU time, OOM is now expected behavior.
rcu: RCU grace-period kthread stack dump:
task:rcu_preempt     state:I stack:24496 pid:16    tgid:16    ppid:2      flags:0x00004000
Call Trace:
 <TASK>
 context_switch kernel/sched/core.c:5409 [inline]
 __schedule+0x17e8/0x4a50 kernel/sched/core.c:6746
 __schedule_loop kernel/sched/core.c:6823 [inline]
 schedule+0x14b/0x320 kernel/sched/core.c:6838
 schedule_timeout+0x1be/0x310 kernel/time/timer.c:2582
 rcu_gp_fqs_loop+0x2df/0x1370 kernel/rcu/tree.c:1663
 rcu_gp_kthread+0xa7/0x3b0 kernel/rcu/tree.c:1862
 kthread+0x2f0/0x390 kernel/kthread.c:388
 ret_from_fork+0x4b/0x80 arch/x86/kernel/process.c:147
 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:244
 </TASK>