rcu: INFO: rcu_preempt detected stalls on CPUs/tasks:
	(detected by 1, t=10502 jiffies, g=85361, q=373 ncpus=2)
rcu: All QSes seen, last rcu_preempt kthread activity 10503 (4295051743-4295041240), jiffies_till_next_fqs=1, root ->qsmask 0x0
rcu: rcu_preempt kthread starved for 10504 jiffies! g85361 f0x2 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:27840 pid:16    ppid:2      flags:0x00004000
Call Trace:
 <TASK>
 context_switch kernel/sched/core.c:5244 [inline]
 __schedule+0x10ec/0x40b0 kernel/sched/core.c:6561
 schedule+0xb9/0x180 kernel/sched/core.c:6637
 schedule_timeout+0x15c/0x280 kernel/time/timer.c:1965
 rcu_gp_fqs_loop+0x2f2/0x1310 kernel/rcu/tree.c:1706
 rcu_gp_kthread+0x95/0x380 kernel/rcu/tree.c:1905
 kthread+0x29d/0x330 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: 12269 Comm: syz.6.1561 Not tainted 6.1.148-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/12/2025
RIP: 0010:mark_lock+0x1/0x320 kernel/locking/lockdep.c:4589
Code: c1 7c 90 48 c7 c7 68 89 1f 8e e8 6a 41 6d 00 4c 89 f7 41 89 d9 e9 79 ff ff ff 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 44 00 00 55 <41> 57 41 56 41 55 41 54 53 50 89 d5 49 89 f6 48 89 fb 49 bd 00 00
RSP: 0018:ffffc900000078d0 EFLAGS: 00000046
RAX: 00000000000c405e RBX: ffff888027b5e404 RCX: 0000000000000001
RDX: 0000000000000000 RSI: ffff888027b5e420 RDI: ffff888027b5d940
RBP: ffffc90000007b30 R08: dffffc0000000000 R09: fffffbfff215bc4a
R10: fffffbfff215bc4a R11: 1ffffffff215bc49 R12: ffff888027b5d940
R13: ffff888027b5e402 R14: ffff888027b5e420 R15: ffff888027b5e440
FS:  00005555865e9500(0000) GS:ffff8880b8e00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000200000bbdffc CR3: 0000000059820000 CR4: 00000000003506f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 <IRQ>
 mark_usage kernel/locking/lockdep.c:4520 [inline]
 __lock_acquire+0xc25/0x7c50 kernel/locking/lockdep.c:5003
 lock_acquire+0x1b4/0x490 kernel/locking/lockdep.c:5662
 __raw_spin_lock_irq include/linux/spinlock_api_smp.h:119 [inline]
 _raw_spin_lock_irq+0x9f/0xe0 kernel/locking/spinlock.c:170
 __run_hrtimer kernel/time/hrtimer.c:1756 [inline]
 __hrtimer_run_queues+0x63a/0xd60 kernel/time/hrtimer.c:1816
 hrtimer_interrupt+0x3c5/0x9c0 kernel/time/hrtimer.c:1878
 local_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1107 [inline]
 __sysvec_apic_timer_interrupt+0x153/0x5a0 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: f5 ff 0f 1f 00 53 48 89 fb 48 83 c7 18 48 8b 74 24 08 e8 fe f8 42 f7 48 89 df e8 56 be 43 f7 e8 61 b0 66 f7 fb bf 01 00 00 00 <e8> 06 3c 37 f7 65 8b 05 57 05 e2 75 85 c0 74 02 5b c3 e8 a4 16 e0
RSP: 0018:ffffc900046c7bb8 EFLAGS: 00000286
RAX: 3fe6460a7c7d8100 RBX: ffff888057d8c0c0 RCX: 3fe6460a7c7d8100
RDX: dffffc0000000000 RSI: ffffffff8a8c0420 RDI: 0000000000000001
RBP: ffff888057d8c558 R08: dffffc0000000000 R09: ffffed100afb1819
R10: ffffed100afb1819 R11: 1ffff1100afb1818 R12: 1ffff1100afb18ab
R13: 0000000000000021 R14: dffffc0000000000 R15: 0000000000000000
 spin_unlock_irq include/linux/spinlock.h:401 [inline]
 get_signal+0x1163/0x1350 kernel/signal.c:2874
 arch_do_signal_or_restart+0xb0/0x1230 arch/x86/kernel/signal.c:871
 exit_to_user_mode_loop+0x70/0x110 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+0x16/0x40 kernel/entry/common.c:303
 do_syscall_64+0x58/0xa0 arch/x86/entry/common.c:87
 entry_SYSCALL_64_after_hwframe+0x68/0xd2
RIP: 0033:0x7f78db58ebe9
Code: 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 01 48
RSP: 002b:00007fffe1705a38 EFLAGS: 00000246
RAX: fffffffffffffffc RBX: 00000000000fdc40 RCX: 00007f78db58ebe9
RDX: 0000000000000000 RSI: 0000000000000080 RDI: 00007f78db7b5fac
RBP: 0000000000000032 R08: 0018a81abe01edf2 R09: 00000006e1705d2f
R10: 00007fffe1705b30 R11: 0000000000000246 R12: 00007f78db7b5fac
R13: 00007fffe1705b30 R14: 00000000000fdc72 R15: 00007fffe1705b50
 </TASK>