rcu: INFO: rcu_preempt detected stalls on CPUs/tasks:
rcu: 	1-...!: (1 ticks this GP) idle=e8e4/1/0x4000000000000000 softirq=32295/32295 fqs=0
rcu: 	(detected by 0, t=10506 jiffies, g=25925, q=430 ncpus=2)
Sending NMI from CPU 0 to CPUs 1:
NMI backtrace for cpu 1
CPU: 1 UID: 0 PID: 8386 Comm: syz.6.838 Not tainted 6.17.0-rc1-syzkaller-00029-g91325f31afc1 #0 PREEMPT(full) 
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/12/2025
RIP: 0010:__run_hrtimer kernel/time/hrtimer.c:1759 [inline]
RIP: 0010:__hrtimer_run_queues+0x4cd/0xc60 kernel/time/hrtimer.c:1825
Code: e8 03 48 b9 00 00 00 00 00 fc ff df 0f b6 04 08 84 c0 0f 85 4b 03 00 00 45 0f b6 6d 00 31 ff 44 89 ee e8 36 fc 11 00 45 85 ed <74> 16 e8 2c f9 11 00 4c 89 e7 4d 89 f3 2e e8 70 5e ce 09 41 89 c6
RSP: 0018:ffffc90000a08d40 EFLAGS: 00000046
RAX: ffffffff81adb27a RBX: ffff8880b8727cc8 RCX: 0000000000010000
RDX: ffff8880571bbc00 RSI: 0000000000000000 RDI: 0000000000000000
RBP: ffffc90000a08e90 R08: ffffffff8fa37e37 R09: 1ffffffff1f46fc6
R10: dffffc0000000000 R11: fffffbfff1f46fc7 R12: ffff88807ec8a340
R13: 0000000000000000 R14: ffffffff899a5e00 R15: 0000000000000001
FS:  0000000000000000(0000) GS:ffff888125d1c000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000001b2d91eff8 CR3: 000000004c1c3000 CR4: 0000000000350ef0
Call Trace:
 <IRQ>
 hrtimer_interrupt+0x45b/0xaa0 kernel/time/hrtimer.c:1887
 local_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1039 [inline]
 __sysvec_apic_timer_interrupt+0x10b/0x410 arch/x86/kernel/apic/apic.c:1056
 instr_sysvec_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1050 [inline]
 sysvec_apic_timer_interrupt+0xa1/0xc0 arch/x86/kernel/apic/apic.c:1050
 </IRQ>
 <TASK>
 asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:702
RIP: 0010:const_folio_flags include/linux/page-flags.h:351 [inline]
RIP: 0010:folio_test_head include/linux/page-flags.h:843 [inline]
RIP: 0010:folio_test_large include/linux/page-flags.h:864 [inline]
RIP: 0010:folio_mapcount include/linux/mm.h:1141 [inline]
RIP: 0010:zap_present_folio_ptes mm/memory.c:1525 [inline]
RIP: 0010:zap_present_ptes mm/memory.c:1581 [inline]
RIP: 0010:do_zap_pte_range mm/memory.c:1682 [inline]
RIP: 0010:zap_pte_range mm/memory.c:1726 [inline]
RIP: 0010:zap_pmd_range mm/memory.c:1818 [inline]
RIP: 0010:zap_pud_range mm/memory.c:1847 [inline]
RIP: 0010:zap_p4d_range mm/memory.c:1868 [inline]
RIP: 0010:unmap_page_range+0x1f87/0x4370 mm/memory.c:1889
Code: 01 00 00 48 8b 7c 24 58 48 8b b4 24 a0 00 00 00 ba 01 00 00 00 48 8b 8c 24 80 00 00 00 e8 31 ae 07 00 48 8b 84 24 08 01 00 00 <48> b9 00 00 00 00 00 fc ff df 80 3c 08 00 48 8b 9c 24 10 01 00 00
RSP: 0018:ffffc9000bc9f5e0 EFLAGS: 00000282
RAX: 1ffffd40002ac211 RBX: ffff88806b49a5f8 RCX: ffff8880571bbc00
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000000
RBP: ffffc9000bc9f890 R08: ffffea00015610b3 R09: 1ffffd40002ac216
R10: dffffc0000000000 R11: fffff940002ac217 R12: dffffc0000000000
R13: 00007fb2bfebf000 R14: 8000000055842000 R15: ffffc9000bc9faa0
 unmap_single_vma mm/memory.c:1932 [inline]
 unmap_vmas+0x399/0x580 mm/memory.c:1976
 exit_mmap+0x248/0xb50 mm/mmap.c:1280
 __mmput+0x118/0x420 kernel/fork.c:1130
 exit_mm+0x1da/0x2c0 kernel/exit.c:582
 do_exit+0x648/0x2300 kernel/exit.c:949
 do_group_exit+0x21c/0x2d0 kernel/exit.c:1102
 __do_sys_exit_group kernel/exit.c:1113 [inline]
 __se_sys_exit_group kernel/exit.c:1111 [inline]
 __x64_sys_exit_group+0x3f/0x40 kernel/exit.c:1111
 x64_sys_call+0x21f7/0x2200 arch/x86/include/generated/asm/syscalls_64.h:232
 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
 do_syscall_64+0xfa/0x3b0 arch/x86/entry/syscall_64.c:94
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7fb2c0b8ebe9
Code: Unable to access opcode bytes at 0x7fb2c0b8ebbf.
RSP: 002b:00007fff17e52418 EFLAGS: 00000246 ORIG_RAX: 00000000000000e7
RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 00007fb2c0b8ebe9
RDX: 0000000000000064 RSI: 0000000000000000 RDI: 0000000000000000
RBP: 00007fff17e5247c R08: 0000000417e5250f R09: 00000000000927c0
R10: 0000000000000001 R11: 0000000000000246 R12: 0000000000000021
R13: 00000000000927c0 R14: 00000000000315d5 R15: 00007fff17e524d0
 </TASK>
rcu: rcu_preempt kthread timer wakeup didn't happen for 10505 jiffies! g25925 f0x0 RCU_GP_WAIT_FQS(5) ->state=0x402
rcu: 	Possible timer handling issue on cpu=1 timer-softirq=14535
rcu: rcu_preempt kthread starved for 10506 jiffies! g25925 f0x0 RCU_GP_WAIT_FQS(5) ->state=0x402 ->cpu=1
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:27224 pid:16    tgid:16    ppid:2      task_flags:0x208040 flags:0x00004000
Call Trace:
 <TASK>
 context_switch kernel/sched/core.c:5357 [inline]
 __schedule+0x1798/0x4cc0 kernel/sched/core.c:6961
 __schedule_loop kernel/sched/core.c:7043 [inline]
 schedule+0x165/0x360 kernel/sched/core.c:7058
 schedule_timeout+0x12b/0x270 kernel/time/sleep_timeout.c:99
 rcu_gp_fqs_loop+0x301/0x1540 kernel/rcu/tree.c:2083
 rcu_gp_kthread+0x99/0x390 kernel/rcu/tree.c:2285
 kthread+0x711/0x8a0 kernel/kthread.c:463
 ret_from_fork+0x3fc/0x770 arch/x86/kernel/process.c:148
 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245
 </TASK>
vkms_vblank_simulate: vblank timer overrun