rcu: INFO: rcu_preempt detected stalls on CPUs/tasks:
	(detected by 0, t=10502 jiffies, g=7785, q=151 ncpus=2)
rcu: All QSes seen, last rcu_preempt kthread activity 10501 (4294956175-4294945674), jiffies_till_next_fqs=1, root ->qsmask 0x0
rcu: rcu_preempt kthread starved for 10502 jiffies! g7785 f0x2 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: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 0 to CPUs 1:
NMI backtrace for cpu 1
CPU: 1 PID: 4281 Comm: syz-executor253 Not tainted syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 08/18/2025
RIP: 0010:lockdep_enabled kernel/locking/lockdep.c:119 [inline]
RIP: 0010:lock_acquire+0x11c/0x490 kernel/locking/lockdep.c:5638
Code: c0 64 9a 1f 8e 48 c1 e8 03 42 0f b6 04 38 84 c0 0f 85 07 02 00 00 83 3d f5 a7 bc 0c 00 0f 84 f1 00 00 00 65 8b 05 04 87 9f 7e <85> c0 0f 85 2f 01 00 00 65 4c 8b 35 b4 7c 9f 7e 49 81 c6 dc 0a 00
RSP: 0018:ffffc90003e77b40 EFLAGS: 00000202
RAX: 0000000000000000 RBX: 0000000000000000 RCX: 03e18441722e8600
RDX: 0000000000000000 RSI: ffffffff8adefd00 RDI: ffffffff8adefcc0
RBP: ffffc90003e77c50 R08: dffffc0000000000 R09: fffffbfff1c3ecb6
R10: fffffbfff1c3ecb6 R11: 1ffffffff1c3ecb5 R12: 0000000000000001
R13: 1ffff920007cef74 R14: 0000000000000000 R15: dffffc0000000000
FS:  00007fe80174a6c0(0000) GS:ffff8880b8f00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000200000000058 CR3: 00000000752a2000 CR4: 00000000003506e0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 <TASK>
 __might_fault+0xc2/0x120 mm/memory.c:5852
 __clear_user arch/x86/include/asm/uaccess_64.h:96 [inline]
 clear_user arch/x86/include/asm/uaccess_64.h:124 [inline]
 copy_siginfo_to_user+0xca/0x140 kernel/signal.c:3341
 __setup_rt_frame arch/x86/kernel/signal.c:491 [inline]
 setup_rt_frame arch/x86/kernel/signal.c:784 [inline]
 handle_signal arch/x86/kernel/signal.c:828 [inline]
 arch_do_signal_or_restart+0xd2e/0x1230 arch/x86/kernel/signal.c:873
 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: 0033:0x7fe801789ed7
Code: 14 25 28 00 00 00 75 05 48 83 c4 28 c3 e8 51 18 00 00 90 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 b0 ff ff ff f7 d8 64 89
RSP: 002b:00007fe80174a178 EFLAGS: 00000246
RAX: 00000000000000ca RBX: 00007fe801814308 RCX: 00007fe801789ed9
RDX: 0000000000000000 RSI: 0000000000000080 RDI: 00007fe801814308
RBP: 00007fe801814300 R08: 00007fe80174a6c0 R09: 00007fe80174a6c0
R10: 0000000000000000 R11: 0000000000000246 R12: 00007fe80181430c
R13: 0000000000000000 R14: 00007ffe538417b0 R15: 00007ffe53841898
 </TASK>
sched: RT throttling activated