rcu: INFO: rcu_preempt detected stalls on CPUs/tasks:
rcu: 	(detected by 1, t=10502 jiffies, g=82749, q=360 ncpus=2)
rcu: All QSes seen, last rcu_preempt kthread activity 10502 (4295028126-4295017624), jiffies_till_next_fqs=1, root ->qsmask 0x0
rcu: rcu_preempt kthread starved for 10502 jiffies! g82749 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:27544 pid:16    tgid:16    ppid:2      task_flags:0x208040 flags:0x00080000
Call Trace:
 <TASK>
 context_switch kernel/sched/core.c:5388 [inline]
 __schedule+0x17b4/0x5680 kernel/sched/core.c:7189
 __schedule_loop kernel/sched/core.c:7268 [inline]
 schedule+0x164/0x360 kernel/sched/core.c:7283
 schedule_timeout+0x158/0x2c0 kernel/time/sleep_timeout.c:99
 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:436
 ret_from_fork+0x514/0xb70 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:
Sending NMI from CPU 1 to CPUs 0:
NMI backtrace for cpu 0
CPU: 0 UID: 0 PID: 3 Comm: pool_workqueue_ Tainted: G             L      syzkaller #0 PREEMPT(full) 
Tainted: [L]=SOFTLOCKUP
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 04/18/2026
RIP: 0010:check_preemption_disabled+0x1d/0xe0 lib/smp_processor_id.c:53
Code: 90 90 90 90 90 90 90 90 90 90 90 90 90 55 41 57 41 56 53 65 8b 05 b7 9f 90 07 65 8b 0d ac 9f 90 07 f7 c1 ff ff ff 7f 74 0c 5b <41> 5e 41 5f 5d e9 74 e0 67 f5 cc 9c 59 f7 c1 00 02 00 00 74 ea 65
RSP: 0018:ffffc90000007c68 EFLAGS: 00000002
RAX: 0000000000000000 RBX: 0000000000000000 RCX: 0000000000010002
RDX: 0000000000d3da00 RSI: ffffffff8e218a98 RDI: ffffffff8c28ace0
RBP: ffffffff84bc8b03 R08: ffffffff84bc8b03 R09: ffffffff9a71fac0
R10: dffffc0000000000 R11: fffff52000000fac R12: 0000000000000000
R13: ffffffff9a71fac0 R14: 0000000000000001 R15: 0000000000000046
FS:  0000000000000000(0000) GS:ffff888125290000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007fad3c7fc16c CR3: 00000000782c3000 CR4: 0000000000350ef0
Call Trace:
 <IRQ>
 lockdep_recursion_finish kernel/locking/lockdep.c:470 [inline]
 lock_acquire+0x116/0x350 kernel/locking/lockdep.c:5870
 __raw_spin_lock_irqsave include/linux/spinlock_api_smp.h:132 [inline]
 _raw_spin_lock_irqsave+0x40/0x60 kernel/locking/spinlock.c:166
 debug_object_activate+0x83/0x580 lib/debugobjects.c:835
 debug_hrtimer_activate kernel/time/hrtimer.c:485 [inline]
 debug_activate kernel/time/hrtimer.c:528 [inline]
 enqueue_hrtimer+0xa9/0x2c0 kernel/time/hrtimer.c:1109
 __run_hrtimer kernel/time/hrtimer.c:1946 [inline]
 __hrtimer_run_queues+0x4d2/0xa20 kernel/time/hrtimer.c:1994
 hrtimer_interrupt+0x44b/0x950 kernel/time/hrtimer.c:2113
 local_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1050 [inline]
 __sysvec_apic_timer_interrupt+0x102/0x430 arch/x86/kernel/apic/apic.c:1067
 instr_sysvec_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1061 [inline]
 sysvec_apic_timer_interrupt+0xa1/0xc0 arch/x86/kernel/apic/apic.c:1061
 </IRQ>
 <TASK>
 asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:697
RIP: 0010:lockdep_unregister_key+0x2d5/0x350 kernel/locking/lockdep.c:6616
Code: 11 0a 09 00 89 c6 48 c7 c7 30 58 41 96 e8 43 12 09 0a 90 e9 65 fe ff ff e8 98 51 06 0a 41 f7 c7 00 02 00 00 74 b3 fb 40 84 ed <75> b2 eb c3 90 0f 0b 90 e9 26 ff ff ff 90 0f 0b 90 e9 2e ff ff ff
RSP: 0018:ffffc90000087c90 EFLAGS: 00000246
RAX: 0000000000000046 RBX: ffff88802f84e930 RCX: 0000000000000046
RDX: ffffffff93fcd398 RSI: ffffffff8dfbf6c3 RDI: ffffffff8c28ace0
RBP: ffff88801d2e1e00 R08: ffffffff9030a8f7 R09: 1ffffffff206151e
R10: dffffc0000000000 R11: fffffbfff206151f R12: 0000000000000000
R13: ffff88802f84e931 R14: 0000000000001000 R15: 0000000000000a47
 wq_unregister_lockdep kernel/workqueue.c:4929 [inline]
 pwq_release_workfn+0x6d1/0x8c0 kernel/workqueue.c:5225
 kthread_worker_fn+0x4ee/0xb20 kernel/kthread.c:1025
 kthread+0x388/0x470 kernel/kthread.c:436
 ret_from_fork+0x514/0xb70 arch/x86/kernel/process.c:158
 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245
 </TASK>