rcu: INFO: rcu_preempt detected stalls on CPUs/tasks:
rcu: 	(detected by 0, t=10502 jiffies, g=18525, q=591 ncpus=2)
rcu: All QSes seen, last rcu_preempt kthread activity 10503 (4294960756-4294950253), jiffies_till_next_fqs=1, root ->qsmask 0x0
rcu: rcu_preempt kthread starved for 10504 jiffies! g18525 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:28088 pid:16    tgid:16    ppid:2      task_flags:0x208040 flags:0x00080000
Call Trace:
 <TASK>
 context_switch kernel/sched/core.c:5295 [inline]
 __schedule+0x1539/0x5080 kernel/sched/core.c:6907
 preempt_schedule_common+0x82/0xd0 kernel/sched/core.c:7091
 preempt_schedule_thunk+0x16/0x30 arch/x86/entry/thunk.S:12
 __raw_spin_unlock_irqrestore include/linux/spinlock_api_smp.h:179 [inline]
 _raw_spin_unlock_irqrestore+0x74/0x80 kernel/locking/spinlock.c:194
 debug_object_free+0x2cf/0x490 lib/debugobjects.c:975
 schedule_timeout+0x168/0x2c0 kernel/time/sleep_timeout.c:103
 rcu_gp_fqs_loop+0x312/0x11d0 kernel/rcu/tree.c:2095
 rcu_gp_kthread+0x9e/0x2b0 kernel/rcu/tree.c:2297
 kthread+0x388/0x470 kernel/kthread.c:467
 ret_from_fork+0x51b/0xa40 arch/x86/kernel/process.c:158
 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245
 </TASK>
rcu: Stack dump where RCU GP kthread last ran:
CPU: 0 UID: 0 PID: 6383 Comm: kworker/R-wg-cr Not tainted syzkaller #0 PREEMPT(full) 
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/13/2026
RIP: 0010:finish_task_switch+0x245/0x920 kernel/sched/core.c:5152
Code: 00 00 48 85 db 0f 85 e8 01 00 00 0f 1f 44 00 00 4c 8b 75 d0 49 83 c4 48 4c 89 e7 e8 65 f8 17 0a e8 80 32 38 00 fb 4c 8b 65 c0 <49> 8d bc 24 30 16 00 00 48 89 f8 48 c1 e8 03 42 0f b6 04 28 84 c0
RSP: 0018:ffffc90003a6f6f8 EFLAGS: 00000202
RAX: 0000000000020637 RBX: 0000000000000000 RCX: 0000000080000001
RDX: 0000000000000006 RSI: ffffffff8dff886f RDI: ffffffff8c295000
RBP: ffffc90003a6f750 R08: ffffffff903246b7 R09: 1ffffffff20648d6
R10: dffffc0000000000 R11: fffffbfff20648d7 R12: ffff888030069e40
R13: dffffc0000000000 R14: ffff8880364c5ac0 R15: ffff8880b843b718
FS:  0000000000000000(0000) GS:ffff88812505d000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000200000000058 CR3: 0000000078f1a000 CR4: 00000000003526f0
Call Trace:
 <TASK>
 context_switch kernel/sched/core.c:5298 [inline]
 __schedule+0x1541/0x5080 kernel/sched/core.c:6907
 preempt_schedule_irq+0x4d/0xa0 kernel/sched/core.c:7234
 irqentry_exit+0x599/0x620 kernel/entry/common.c:239
 asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:697
RIP: 0010:wq_worker_running+0x3b/0x200 kernel/workqueue.c:1408
Code: 49 bc 00 00 00 00 00 fc ff df e8 50 02 38 00 48 89 df e8 68 02 03 00 49 89 c6 4c 8d 68 34 4c 89 eb 48 c1 eb 03 42 0f b6 04 23 <84> c0 0f 85 4c 01 00 00 41 8b 6d 00 31 ff 89 ee e8 60 06 38 00 85
RSP: 0018:ffffc90003a6fa80 EFLAGS: 00000a07
RAX: 0000000000000000 RBX: 1ffff1100a9f6766 RCX: ffff888030069e40
RDX: 0000000000000000 RSI: 0000000000200000 RDI: 0000000000000000
RBP: ffffc90003a6fc70 R08: ffffffff903246b7 R09: 1ffffffff20648d6
R10: dffffc0000000000 R11: fffffbfff20648d7 R12: dffffc0000000000
R13: ffff888054fb3b34 R14: ffff888054fb3b00 R15: ffff88803006b5e0
 schedule_preempt_disabled+0x13/0x30 kernel/sched/core.c:7061
 __mutex_lock_common kernel/locking/mutex.c:692 [inline]
 __mutex_lock+0x7fe/0x1300 kernel/locking/mutex.c:776
 worker_attach_to_pool+0x2e/0x3a0 kernel/workqueue.c:2691
 rescuer_thread+0x357/0x1210 kernel/workqueue.c:3579
 kthread+0x388/0x470 kernel/kthread.c:467
 ret_from_fork+0x51b/0xa40 arch/x86/kernel/process.c:158
 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245
 </TASK>