rcu: INFO: rcu_preempt detected stalls on CPUs/tasks:
rcu: 	1-...!: (2 ticks this GP) idle=a014/1/0x4000000000000000 softirq=56631/56631 fqs=5
rcu: 	(detected by 0, t=10506 jiffies, g=87941, q=559 ncpus=2)
Sending NMI from CPU 0 to CPUs 1:
NMI backtrace for cpu 1
CPU: 1 PID: 15724 Comm: syz-executor.5 Not tainted 6.9.0-rc5-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 03/27/2024
RIP: 0010:enqueue_hrtimer+0xd5/0x3c0 kernel/time/hrtimer.c:1091
Code: 50 12 00 eb 19 e8 5b 50 12 00 eb 12 80 3d 33 c3 0f 0e 01 0f 85 1c 01 00 00 e8 47 50 12 00 4d 89 ef 49 c1 ef 03 43 80 3c 27 00 <74> 08 4c 89 ef e8 81 b2 76 00 49 8b 6d 00 48 83 c5 4c 48 89 e8 48
RSP: 0018:ffffc90000a08d28 EFLAGS: 00000046
RAX: ffffffff8183b0fe RBX: 0000000000000001 RCX: ffff88804af33c00
RDX: 0000000000010002 RSI: ffffffff8c1f8500 RDI: ffffffff8c1f84c0
RBP: 0000000000000001 R08: ffffffff8183b0ec R09: 1ffffffff1f51c55
R10: dffffc0000000000 R11: fffffbfff1f51c56 R12: dffffc0000000000
R13: ffff8880b952c980 R14: ffff88806906e340 R15: 1ffff110172a5930
FS:  0000000000000000(0000) GS:ffff8880b9500000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000555583e15978 CR3: 000000000e134000 CR4: 0000000000350ef0
Call Trace:
 <NMI>
 </NMI>
 <IRQ>
 __run_hrtimer kernel/time/hrtimer.c:1709 [inline]
 __hrtimer_run_queues+0x6d5/0xd50 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+0x112/0x3f0 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:rcu_lockdep_current_cpu_online+0xf1/0x120 kernel/rcu/tree.c:4295
Code: 7d 00 4c 23 3b 75 1a 48 c7 c7 40 a2 33 8e be 04 00 00 00 e8 61 c2 7d 00 83 3d 7a fe b6 0c 00 74 15 b0 01 65 ff 0d f7 2f 87 7e <74> 0e 5b 41 5e 41 5f e9 2e 9d 33 0a 31 c0 eb e9 e8 0a 0f 84 ff eb
RSP: 0018:ffffc9000446f278 EFLAGS: 00000282
RAX: 1ffffffff1c67301 RBX: ffffffff8e3399b0 RCX: 0000000080000001
RDX: 0000000000000000 RSI: ffffffff8c1f8500 RDI: ffff8880b953f5a0
RBP: 0000000000000140 R08: ffffffff820643fe R09: 1ffffffff25e64a0
R10: dffffc0000000000 R11: fffffbfff25e64a1 R12: 0000000000053710
R13: 8000000053710867 R14: dffffc0000000000 R15: 0000000000000002
 rcu_read_lock_held_common kernel/rcu/update.c:113 [inline]
 rcu_read_lock_held+0x1e/0x50 kernel/rcu/update.c:349
 lookup_page_ext mm/page_ext.c:240 [inline]
 page_ext_get+0x192/0x2a0 mm/page_ext.c:509
 page_table_check_clear+0x59/0x730 mm/page_table_check.c:72
 clear_full_ptes include/linux/pgtable.h:671 [inline]
 zap_present_folio_ptes mm/memory.c:1492 [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+0x31d3/0x4820 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: 0033:0x7fa796a7dea9
Code: Unable to access opcode bytes at 0x7fa796a7de7f.
RSP: 002b:00007fa7977e80c8 EFLAGS: 00000246 ORIG_RAX: 000000000000002e
RAX: 00000000000000b0 RBX: 00007fa796babf80 RCX: 00007fa796a7dea9
RDX: 0000000000000000 RSI: 00000000200007c0 RDI: 0000000000000004
RBP: 00007fa796aca4a4 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 000000000000000b R14: 00007fa796babf80 R15: 00007fff0a988298
 </TASK>
rcu: rcu_preempt kthread timer wakeup didn't happen for 10360 jiffies! g87941 f0x0 RCU_GP_WAIT_FQS(5) ->state=0x402
rcu: 	Possible timer handling issue on cpu=1 timer-softirq=47847
rcu: rcu_preempt kthread starved for 10361 jiffies! g87941 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:24944 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+0x2f2/0x390 kernel/kthread.c:388
 ret_from_fork+0x4d/0x80 arch/x86/kernel/process.c:147
 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:244
 </TASK>