rcu: INFO: rcu_preempt detected stalls on CPUs/tasks:
rcu: 	(detected by 1, t=10502 jiffies, g=8657, q=85 ncpus=2)
rcu: All QSes seen, last rcu_preempt kthread activity 10500 (4294956049-4294945549), jiffies_till_next_fqs=1, root ->qsmask 0x0
rcu: rcu_preempt kthread starved for 10500 jiffies! g8657 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:27752 pid:17    ppid:2      flags:0x00004000
Call Trace:
 <TASK>
 context_switch kernel/sched/core.c:5380 [inline]
 __schedule+0x14d2/0x44d0 kernel/sched/core.c:6699
 schedule+0xbd/0x170 kernel/sched/core.c:6773
 schedule_timeout+0x160/0x280 kernel/time/timer.c:2167
 rcu_gp_fqs_loop+0x302/0x1560 kernel/rcu/tree.c:1667
 rcu_gp_kthread+0x99/0x380 kernel/rcu/tree.c:1866
 kthread+0x2fa/0x390 kernel/kthread.c:388
 ret_from_fork+0x48/0x80 arch/x86/kernel/process.c:152
 ret_from_fork_asm+0x11/0x20 arch/x86/entry/entry_64.S:293
 </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: 5818 Comm: syz-executor275 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:122 [inline]
RIP: 0010:lock_acquire+0x122/0x410 kernel/locking/lockdep.c:5730
Code: 65 8b 05 19 95 9b 7e 85 c0 0f 85 2e 01 00 00 65 4c 8b 35 e1 c2 9c 7e 49 81 c6 dc 0a 00 00 4c 89 f0 48 c1 e8 03 42 0f b6 04 38 <84> c0 0f 85 f3 01 00 00 41 83 3e 00 0f 85 01 01 00 00 48 c7 84 24
RSP: 0018:ffffc900047df9e0 EFLAGS: 00000807
RAX: 0000000000000000 RBX: 0000000000000000 RCX: f349d783a9802b00
RDX: 0000000000000000 RSI: ffffffff8afc63e0 RDI: ffffffff8afc63a0
RBP: ffffc900047dfae8 R08: ffffffff8e4a83af R09: 1ffffffff1c95075
R10: dffffc0000000000 R11: fffffbfff1c95076 R12: 1ffff920008fbf48
R13: ffff88807bb6a038 R14: ffff8880784946dc R15: dffffc0000000000
FS:  000055557b5ae3c0(0000) GS:ffff8880b8e00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007feacbcee700 CR3: 0000000068cf7000 CR4: 00000000003506f0
Call Trace:
 <TASK>
 __raw_spin_lock_irqsave include/linux/spinlock_api_smp.h:110 [inline]
 _raw_spin_lock_irqsave+0xa8/0xf0 kernel/locking/spinlock.c:162
 __lock_timer+0x2b6/0x3f0 kernel/time/posix-timers.c:596
 posixtimer_rearm+0x60/0x340 kernel/time/posix-timers.c:263
 dequeue_signal+0x1ba/0x4b0 kernel/signal.c:706
 get_signal+0x551/0x1400 kernel/signal.c:2782
 arch_do_signal_or_restart+0x96/0x780 arch/x86/kernel/signal.c:310
 exit_to_user_mode_loop+0x70/0x110 kernel/entry/common.c:174
 exit_to_user_mode_prepare+0xf6/0x180 kernel/entry/common.c:210
 __syscall_exit_to_user_mode_work kernel/entry/common.c:291 [inline]
 syscall_exit_to_user_mode+0x1a/0x50 kernel/entry/common.c:302
 do_syscall_64+0x61/0xb0 arch/x86/entry/common.c:87
 entry_SYSCALL_64_after_hwframe+0x68/0xd2
RIP: 0033:0x7feacbcd6b69
Code: 28 00 00 00 75 05 48 83 c4 28 c3 e8 31 1e 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 01 48
RSP: 002b:00007ffc0cb36948 EFLAGS: 00000246
RAX: 0000000000000000 RBX: 0000000000000003 RCX: 00007feacbcd6b69
RDX: 000020000006b000 RSI: 0000000000000000 RDI: 0000000000000000
RBP: 0000000000000000 R08: 00007ffc0cb36980 R09: 00007ffc0cb36980
R10: 0000000000000000 R11: 0000000000000246 R12: 00007feacbd59488
R13: 00007ffc0cb3696c R14: 0000000000000000 R15: 431bde82d7b634db
 </TASK>