rcu: INFO: rcu_preempt detected stalls on CPUs/tasks:
rcu: 	(detected by 0, t=10502 jiffies, g=15721, q=624 ncpus=2)
rcu: All QSes seen, last rcu_preempt kthread activity 6044 (4294959831-4294953787), jiffies_till_next_fqs=1, root ->qsmask 0x0
rcu: rcu_preempt kthread starved for 6045 jiffies! g15721 f0x2 RCU_GP_CLEANUP(7) ->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:29096 pid:16    tgid:16    ppid:2      task_flags:0x208040 flags:0x00080000
Call Trace:
 <TASK>
 context_switch kernel/sched/core.c:5256 [inline]
 __schedule+0x1139/0x6150 kernel/sched/core.c:6863
 preempt_schedule_irq+0x51/0x90 kernel/sched/core.c:7190
 irqentry_exit+0x1d8/0x8c0 kernel/entry/common.c:216
 asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:697
RIP: 0010:lock_is_held_type+0x107/0x150 kernel/locking/lockdep.c:5945
Code: 00 00 b8 ff ff ff ff 65 0f c1 05 5c 80 3a 08 83 f8 01 75 2d 9c 58 f6 c4 02 75 43 48 f7 04 24 00 02 00 00 74 01 fb 48 83 c4 08 <44> 89 e8 5b 5d 41 5c 41 5d 41 5e 41 5f e9 87 2c 03 00 45 31 ed eb
RSP: 0018:ffffc90000157be8 EFLAGS: 00000286
RAX: 0000000000000046 RBX: 1ffff9200002af86 RCX: 0000000000000001
RDX: 0000000000000000 RSI: ffffffff8daa9241 RDI: ffffffff8bf2b280
RBP: ffffffff8e3c95e0 R08: 0000000000000001 R09: 0000000000000001
R10: ffffffff9088cad7 R11: ffff88801da98b30 R12: ffff88801da98000
R13: 0000000000000000 R14: 00000000ffffffff R15: 0000000000000000
 lock_is_held include/linux/lockdep.h:249 [inline]
 __might_resched+0x4ca/0x5e0 kernel/sched/core.c:8789
 rcu_gp_cleanup+0x350/0xe90 kernel/rcu/tree.c:2200
 rcu_gp_kthread+0x27e/0x380 kernel/rcu/tree.c:2289
 kthread+0x3c5/0x780 kernel/kthread.c:463
 ret_from_fork+0x983/0xb10 arch/x86/kernel/process.c:158
 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:246
 </TASK>
rcu: Stack dump where RCU GP kthread last ran:
CPU: 0 UID: 0 PID: 6724 Comm: syz.0.40 Not tainted syzkaller #0 PREEMPT(full) 
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/25/2025
RIP: 0010:__raw_spin_unlock_irq include/linux/spinlock_api_smp.h:160 [inline]
RIP: 0010:_raw_spin_unlock_irq+0x29/0x50 kernel/locking/spinlock.c:202
Code: 90 f3 0f 1e fa 53 48 8b 74 24 08 48 89 fb 48 83 c7 18 e8 4a 6f 1e f6 48 89 df e8 02 c2 1e f6 e8 0d 8a 4b f6 fb bf 01 00 00 00 <e8> d2 c4 0e f6 65 8b 05 9b 59 37 08 85 c0 74 06 5b e9 01 4d 00 00
RSP: 0018:ffffc9000401fca0 EFLAGS: 00000202
RAX: 00000000050463e9 RBX: ffff88802782c0c0 RCX: ffffffff81c71f9f
RDX: 0000000000000000 RSI: ffffffff8dacf2d0 RDI: 0000000000000001
RBP: ffff88802782c4c0 R08: 0000000000000001 R09: 0000000000000001
R10: ffffffff9088cad7 R11: ffff88802ffb0b30 R12: 0000000000000000
R13: 0000000000000021 R14: 0000000000000400 R15: ffff88802782c0c0
FS:  00007fe244d4e6c0(0000) GS:ffff8881248f1000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000200000000058 CR3: 000000007c057000 CR4: 00000000003526f0
Call Trace:
 <TASK>
 spin_unlock_irq include/linux/spinlock.h:401 [inline]
 get_signal+0x1e6a/0x26d0 kernel/signal.c:3037
 arch_do_signal_or_restart+0x8f/0x7e0 arch/x86/kernel/signal.c:337
 __exit_to_user_mode_loop kernel/entry/common.c:41 [inline]
 exit_to_user_mode_loop+0x8c/0x540 kernel/entry/common.c:75
 __exit_to_user_mode_prepare include/linux/irq-entry-common.h:226 [inline]
 syscall_exit_to_user_mode_prepare include/linux/irq-entry-common.h:256 [inline]
 syscall_exit_to_user_mode_work include/linux/entry-common.h:159 [inline]
 syscall_exit_to_user_mode include/linux/entry-common.h:194 [inline]
 do_syscall_64+0x4ee/0xf80 arch/x86/entry/syscall_64.c:100
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7fe243f8f747
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:00007fe244d4e0e8 EFLAGS: 00000246
RAX: 00000000000000ca RBX: 00007fe2441e5fa8 RCX: 00007fe243f8f749
RDX: 0000000000000000 RSI: 0000000000000080 RDI: 00007fe2441e5fa8
RBP: 00007fe2441e5fa0 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007fe2441e6038 R14: 00007ffe4eb00970 R15: 00007ffe4eb00a58
 </TASK>