rcu: INFO: rcu_preempt detected stalls on CPUs/tasks:
	(detected by 1, t=10502 jiffies, g=12717, q=25 ncpus=2)
rcu: All QSes seen, last rcu_preempt kthread activity 10503 (4294958400-4294947897), jiffies_till_next_fqs=1, root ->qsmask 0x0
rcu: rcu_preempt kthread starved for 10504 jiffies! g12717 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:28016 pid:16    ppid:2      flags:0x00004000
Call Trace:
 <TASK>
 context_switch kernel/sched/core.c:5245 [inline]
 __schedule+0x11d1/0x40e0 kernel/sched/core.c:6562
 preempt_schedule_common+0x82/0xd0 kernel/sched/core.c:6731
 preempt_schedule+0xbc/0xd0 kernel/sched/core.c:6755
 preempt_schedule_thunk+0x16/0x18 arch/x86/entry/thunk_64.S:34
 __raw_spin_unlock_irqrestore include/linux/spinlock_api_smp.h:152 [inline]
 _raw_spin_unlock_irqrestore+0x10d/0x120 kernel/locking/spinlock.c:194
 prepare_to_swait_event+0x335/0x350 kernel/sched/swait.c:119
 rcu_gp_fqs_loop+0x2ce/0x1340 kernel/rcu/tree.c:1706
 rcu_gp_kthread+0x99/0x3b0 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: 4890 Comm: syz.4.219 Not tainted syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 02/12/2026
RIP: 0010:preempt_count arch/x86/include/asm/preempt.h:27 [inline]
RIP: 0010:trace_hardirqs_off+0x24/0x40 kernel/trace/trace_preemptirq.c:81
Code: 00 e9 59 ff ff ff 53 48 8b 5c 24 08 48 89 df e8 b2 c5 a3 08 65 8b 05 43 55 7a 7e 85 c0 75 19 65 c7 05 34 55 7a 7e 01 00 00 00 <65> 8b 05 fd 8d 79 7e a9 00 00 f0 00 74 02 5b c3 48 89 df 31 f6 5b
RSP: 0018:ffffc90005417c10 EFLAGS: 00000046
RAX: 0000000000000000 RBX: ffffffff8a36bcb6 RCX: f2f9126ec2ce2d00
RDX: 0000000000000000 RSI: ffffffff8a8c1220 RDI: ffffffff8adf0de0
RBP: ffffc90005417c98 R08: ffffc90005410000 R09: ffffc90005417ff0
R10: dffffc0000000000 R11: fffffbfff1c3f9a6 R12: ffff888072cf5940
R13: dffffc0000000000 R14: 1ffff92000a82f84 R15: dffffc0000000000
FS:  00007f7fa6f456c0(0000) GS:ffff8880b8e00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f32aa3e9d40 CR3: 000000002a5ee000 CR4: 00000000003506f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 <TASK>
 __raw_spin_lock_irq include/linux/spinlock_api_smp.h:117 [inline]
 _raw_spin_lock_irq+0x86/0xf0 kernel/locking/spinlock.c:170
 spin_lock_irq include/linux/spinlock.h:376 [inline]
 __set_current_blocked+0xe7/0x240 kernel/signal.c:3058
 __ia32_sys_rt_sigreturn+0x1ad/0x760 arch/x86/kernel/signal.c:673
 do_syscall_x64 arch/x86/entry/common.c:46 [inline]
 do_syscall_64+0x4c/0xa0 arch/x86/entry/common.c:76
 entry_SYSCALL_64_after_hwframe+0x68/0xd2
RIP: 0033:0x7f7fa5f3da19
Code: 11 06 00 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 40 00 90 66 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 40 00 48 c7 c0 0f 00 00 00 0f 05 <0f> 1f 80 00 00 00 00 48 81 ec 48 01 00 00 49 89 d0 64 48 8b 0c 25
RSP: 002b:00007f7fa6f44b40 EFLAGS: 00000206 ORIG_RAX: 000000000000000f
RAX: ffffffffffffffda RBX: 00007f7fa6215fa8 RCX: 00007f7fa5f3da19
RDX: 00007f7fa6f44b40 RSI: 00007f7fa6f44c70 RDI: 0000000000000021
RBP: 00007f7fa6215fa0 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000206 R12: 0000000000000000
R13: 00007f7fa6216038 R14: 00007fff2e8e3d50 R15: 00007fff2e8e3e38
 </TASK>