rcu: INFO: rcu_preempt self-detected stall on CPU
rcu: 	0-...!: (10499 ticks this GP) idle=d6b4/1/0x4000000000000000 softirq=25512/25512 fqs=14
	(t=10500 jiffies g=33829 q=281 ncpus=2)
rcu: rcu_preempt kthread starved for 10470 jiffies! g33829 f0x0 RCU_GP_WAIT_FQS(5) ->state=0x0 ->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:R  running task     stack:27712 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:2168
 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 0 to CPUs 1:
NMI backtrace for cpu 1
CPU: 1 PID: 6855 Comm: syz.8.437 Not tainted syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/25/2025
RIP: 0010:lockdep_hardirqs_off+0x89/0x100 kernel/locking/lockdep.c:4418
Code: 35 ec 00 f2 75 48 c7 c7 00 06 6c 8a e8 f0 13 00 00 65 c7 05 05 08 f2 75 00 00 00 00 49 89 9e 88 0a 00 00 41 8b 86 78 0a 00 00 <ff> c0 41 89 86 78 0a 00 00 41 89 86 94 0a 00 00 eb 17 48 c7 c7 20
RSP: 0018:ffffc9000d2c7a98 EFLAGS: 00000082
RAX: 0000000004233ffb RBX: ffffffff8a1065da RCX: 30c61fb283370800
RDX: 0000000000000000 RSI: ffffffff8a6c0600 RDI: ffffffff8abef920
RBP: 0000000000000000 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000000 R12: 0000000000000000
R13: 0000000000000000 R14: ffff88801ab40000 R15: 0000000000000000
FS:  00007f06f976f6c0(0000) GS:ffff8880b8f00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 000020000006b000 CR3: 000000007d564000 CR4: 00000000003506e0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 <TASK>
 irqentry_enter+0x27/0x50 kernel/entry/common.c:-1
 sysvec_apic_timer_interrupt+0xa/0xc0 arch/x86/kernel/apic/apic.c:1118
 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 ae 05 49 f7 48 89 df e8 06 cb 49 f7 e8 d1 bd 6c f7 fb bf 01 00 00 00 <e8> 96 43 3d f7 65 8b 05 27 f1 e7 75 85 c0 74 02 5b c3 e8 c4 02 e6
RSP: 0018:ffffc9000d2c7b98 EFLAGS: 00000282
RAX: 30c61fb283370800 RBX: ffff88802e811bc0 RCX: 30c61fb283370800
RDX: dffffc0000000000 RSI: ffffffff8a6c0600 RDI: 0000000000000001
RBP: ffff88802e812058 R08: dffffc0000000000 R09: ffffed1005d02379
R10: ffffed1005d02379 R11: 1ffff11005d02378 R12: 1ffff11005d0240b
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+0xb7/0x1240 arch/x86/kernel/signal.c:871
 exit_to_user_mode_loop+0x70/0x110 kernel/entry/common.c:174
 exit_to_user_mode_prepare+0xee/0x180 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: 0033:0x7f06f898f747
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:00007f06f976f0e8 EFLAGS: 00000246
RAX: 00000000000000ca RBX: 00007f06f8be5fa8 RCX: 00007f06f898f749
RDX: 0000000000000000 RSI: 0000000000000080 RDI: 00007f06f8be5fa8
RBP: 00007f06f8be5fa0 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007f06f8be6038 R14: 00007fffc64abdc0 R15: 00007fffc64abea8
 </TASK>
CPU: 0 PID: 6847 Comm: syz.5.435 Not tainted syzkaller #0
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+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 ae 05 49 f7 48 89 df e8 06 cb 49 f7 e8 d1 bd 6c f7 fb bf 01 00 00 00 <e8> 96 43 3d f7 65 8b 05 27 f1 e7 75 85 c0 74 02 5b c3 e8 c4 02 e6
RSP: 0018:ffffc9000d1a7b98 EFLAGS: 00000282
RAX: 5d51ec63d27c3700 RBX: ffff88802e8140c0 RCX: 5d51ec63d27c3700
RDX: dffffc0000000000 RSI: ffffffff8a6c0600 RDI: 0000000000000001
RBP: ffff88802e814558 R08: dffffc0000000000 R09: ffffed1005d02819
R10: ffffed1005d02819 R11: 1ffff11005d02818 R12: 1ffff11005d028ab
R13: 0000000000000021 R14: dffffc0000000000 R15: 0000000000000000
FS:  0000555569862500(0000) GS:ffff8880b8e00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 000000110c40a007 CR3: 00000000572b2000 CR4: 00000000003506f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 <TASK>
 spin_unlock_irq include/linux/spinlock.h:401 [inline]
 get_signal+0x1163/0x1350 kernel/signal.c:2874
 arch_do_signal_or_restart+0xb7/0x1240 arch/x86/kernel/signal.c:871
 exit_to_user_mode_loop+0x70/0x110 kernel/entry/common.c:174
 exit_to_user_mode_prepare+0xee/0x180 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: 0033:0x7f62ec86f09a
Code: c4 38 5b 5d 41 5c 41 5d 41 5e 41 5f c3 0f 1f 00 c6 44 24 1e 01 48 89 ee 44 89 e7 4c 89 44 24 10 4c 89 54 24 08 e8 66 e6 fd ff <4c> 8b 54 24 08 4c 8b 44 24 10 84 c0 0f 85 60 ff ff ff 80 7c 24 1f
RSP: 002b:00007ffc9c67f400 EFLAGS: 00000246
RAX: 0000000000000001 RBX: 00007f62ed715720 RCX: ffffffff84061af7
RDX: 0000000000001af7 RSI: ffffffff84061af7 RDI: 0000000000000008
RBP: ffffffff84061af7 R08: 00007f62ecbd0000 R09: 00007f62ecbd2000
R10: 0000000084061afb R11: 0000000000000008 R12: 0000000000000008
R13: 0000000000000000 R14: ffffffff84061922 R15: 0000000000006887
 </TASK>