rcu: INFO: rcu_preempt self-detected stall on CPU
rcu: 	1-...!: (1 GPs behind) idle=7b54/0/0x1 softirq=9570/9571 fqs=7
	(t=10500 jiffies g=8461 q=100 ncpus=2)
rcu: rcu_preempt kthread starved for 10486 jiffies! g8461 f0x0 RCU_GP_WAIT_FQS(5) ->state=0x0 ->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:R  running task     stack:25528 pid:16    ppid:2      flags:0x00004000
Call Trace:
 <TASK>
 context_switch kernel/sched/core.c:5241 [inline]
 __schedule+0x143f/0x4570 kernel/sched/core.c:6558
 schedule+0xbf/0x180 kernel/sched/core.c:6634
 schedule_timeout+0x1b9/0x300 kernel/time/timer.c:1965
 rcu_gp_fqs_loop+0x2d2/0x1150 kernel/rcu/tree.c:1706
 rcu_gp_kthread+0xa3/0x3b0 kernel/rcu/tree.c:1905
 kthread+0x28d/0x320 kernel/kthread.c:376
 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:295
 </TASK>
rcu: Stack dump where RCU GP kthread last ran:
Sending NMI from CPU 1 to CPUs 0:
NMI backtrace for cpu 0
CPU: 0 PID: 4532 Comm: syz.2.49 Not tainted 6.1.115-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 09/13/2024
RIP: 0010:sig_handler kernel/signal.c:69 [inline]
RIP: 0010:sig_task_ignored kernel/signal.c:83 [inline]
RIP: 0010:sig_ignored kernel/signal.c:119 [inline]
RIP: 0010:prepare_signal+0x7f1/0xc80 kernel/signal.c:974
Code: 00 00 00 fc ff df 80 3c 08 00 74 08 48 89 df e8 45 56 8b 00 48 8b 1b 45 84 ff 4c 8b 64 24 30 0f 84 1e 04 00 00 48 8b 44 24 08 <48> c1 e0 05 48 8d 9c 03 98 00 00 00 48 89 d8 48 c1 e8 03 49 bf 00
RSP: 0018:ffffc90000007b20 EFLAGS: 00000002
RAX: 0000000000000020 RBX: ffff8880216fe5c0 RCX: dffffc0000000000
RDX: ffff888077c50000 RSI: 0000000000000021 RDI: 0000000000000009
RBP: ffffc90000007c10 R08: ffffffff8156bf71 R09: fffffbfff224604f
R10: 0000000000000000 R11: dffffc0000000001 R12: ffff888019364490
R13: 1ffff92000000f70 R14: ffff888019363b80 R15: dffffc0000000001
FS:  00007faef6a686c0(0000) GS:ffff8880b8e00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 000055558c8bb5c8 CR3: 000000007b9bd000 CR4: 00000000003506f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 <NMI>
 </NMI>
 <IRQ>
 send_sigqueue+0x1f9/0x720 kernel/signal.c:1983
 posix_timer_event kernel/time/posix-timers.c:359 [inline]
 posix_timer_fn+0x186/0x390 kernel/time/posix-timers.c:385
 __run_hrtimer kernel/time/hrtimer.c:1689 [inline]
 __hrtimer_run_queues+0x5e5/0xe50 kernel/time/hrtimer.c:1753
 hrtimer_interrupt+0x392/0x980 kernel/time/hrtimer.c:1815
 local_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1107 [inline]
 __sysvec_apic_timer_interrupt+0x158/0x5b0 arch/x86/kernel/apic/apic.c:1124
 instr_sysvec_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1118 [inline]
 sysvec_apic_timer_interrupt+0x9b/0xc0 arch/x86/kernel/apic/apic.c:1118
 </IRQ>
 <TASK>
 asm_sysvec_apic_timer_interrupt+0x16/0x20 arch/x86/include/asm/idtentry.h:691
RIP: 0010:__raw_spin_unlock_irq include/linux/spinlock_api_smp.h:160 [inline]
RIP: 0010:_raw_spin_unlock_irq+0x25/0x40 kernel/locking/spinlock.c:202
Code: 91 9b f5 ff 90 53 48 89 fb 48 83 c7 18 48 8b 74 24 08 e8 2e 27 b9 f6 48 89 df e8 26 65 ba f6 e8 21 bc df f6 fb bf 01 00 00 00 <e8> 26 ef ac f6 65 8b 05 87 d7 50 75 85 c0 74 02 5b c3 e8 34 fb 4e
RSP: 0018:ffffc900066e7b30 EFLAGS: 00000286
RAX: 3220f42dc98d7a00 RBX: ffff8880216fe5c0 RCX: ffffffff97337103
RDX: dffffc0000000000 RSI: ffffffff8b0c02c0 RDI: 0000000000000001
RBP: ffffc900066e7c70 R08: dffffc0000000000 R09: ffffed10042dfcb9
R10: 0000000000000000 R11: dffffc0000000001 R12: 1ffff110042dfd4b
R13: 000000001c000004 R14: 0000000000000021 R15: ffff8880216fea58
 spin_unlock_irq include/linux/spinlock.h:401 [inline]
 get_signal+0x154b/0x17d0 kernel/signal.c:2873
 arch_do_signal_or_restart+0xb0/0x1a10 arch/x86/kernel/signal.c:871
 exit_to_user_mode_loop+0x6a/0x100 kernel/entry/common.c:174
 exit_to_user_mode_prepare+0xb1/0x140 kernel/entry/common.c:210
 __syscall_exit_to_user_mode_work kernel/entry/common.c:292 [inline]
 syscall_exit_to_user_mode+0x60/0x270 kernel/entry/common.c:303
 do_syscall_64+0x47/0xb0 arch/x86/entry/common.c:87
 entry_SYSCALL_64_after_hwframe+0x68/0xd2
RIP: 0033:0x7faef5b7e717
Code: ff ff ff ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 40 00 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 <0f> 05 48 3d 01 f0 ff ff 73 01 c3 48 c7 c1 a8 ff ff ff f7 d8 64 89
RSP: 002b:00007faef6a68038 EFLAGS: 00000246
RAX: 0000000000000113 RBX: 00007faef5d35f80 RCX: 00007faef5b7e719
RDX: 0000000000000005 RSI: 0000000000000000 RDI: 0000000000000006
RBP: 00007faef5bf139e R08: 0000000000000005 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 0000000000000000 R14: 00007faef5d35f80 R15: 00007ffe42acad28
 </TASK>
CPU: 1 PID: 0 Comm: swapper/1 Not tainted 6.1.115-syzkaller #0
sched: RT throttling activated
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 09/13/2024
RIP: 0010:native_save_fl arch/x86/include/asm/irqflags.h:22 [inline]
RIP: 0010:arch_local_save_flags arch/x86/include/asm/irqflags.h:70 [inline]
RIP: 0010:arch_irqs_disabled arch/x86/include/asm/irqflags.h:130 [inline]
RIP: 0010:acpi_safe_halt drivers/acpi/processor_idle.c:112 [inline]
RIP: 0010:acpi_idle_do_entry+0x10f/0x340 drivers/acpi/processor_idle.c:567
Code: 09 d9 f6 48 83 e3 08 0f 85 0b 01 00 00 4c 8d 74 24 20 e8 c4 c5 df f6 0f 1f 44 00 00 e8 3a 05 d9 f6 0f 00 2d 23 16 b6 00 fb f4 <4c> 89 f3 48 c1 eb 03 42 80 3c 3b 00 74 08 4c 89 f7 e8 7b 88 30 f7
RSP: 0018:ffffc90000177b80 EFLAGS: 000002d3
RAX: ffffffff8ab18e16 RBX: 0000000000000000 RCX: ffff888017fe9dc0
RDX: 0000000000000000 RSI: ffffffff8b0c02c0 RDI: ffffffff8b5d7540
RBP: ffffc90000177c10 R08: ffffffff8ab18df8 R09: ffffed1002ffd3b9
R10: 0000000000000000 R11: dffffc0000000001 R12: 1ffff9200002ef70
R13: ffff8881462fc004 R14: ffffc90000177ba0 R15: dffffc0000000000
FS:  0000000000000000(0000) GS:ffff8880b8f00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000001b2d315ff8 CR3: 000000007b9bd000 CR4: 00000000003506e0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 <IRQ>
 </IRQ>
 <TASK>
 acpi_idle_enter+0x352/0x4f0 drivers/acpi/processor_idle.c:704
 cpuidle_enter_state+0x516/0xf80 drivers/cpuidle/cpuidle.c:239
 cpuidle_enter+0x59/0x90 drivers/cpuidle/cpuidle.c:356
 call_cpuidle kernel/sched/idle.c:155 [inline]
 cpuidle_idle_call kernel/sched/idle.c:236 [inline]
 do_idle+0x3ce/0x680 kernel/sched/idle.c:303
 cpu_startup_entry+0x3d/0x60 kernel/sched/idle.c:401
 start_secondary+0xe4/0xf0 arch/x86/kernel/smpboot.c:281
 secondary_startup_64_no_verify+0xcf/0xdb
 </TASK>