rcu: INFO: rcu_preempt detected stalls on CPUs/tasks:
rcu: 	(detected by 1, t=10506 jiffies, g=22857, q=287 ncpus=2)
rcu: All QSes seen, last rcu_preempt kthread activity 10506 (4294970080-4294959574), jiffies_till_next_fqs=1, root ->qsmask 0x0
rcu: rcu_preempt kthread starved for 10506 jiffies! g22857 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:28440 pid:16    tgid:16    ppid:2      task_flags:0x208040 flags:0x00080000
Call Trace:
 <TASK>
 context_switch kernel/sched/core.c:5256 [inline]
 __schedule+0x1139/0x6150 kernel/sched/core.c:6863
 __schedule_loop kernel/sched/core.c:6945 [inline]
 schedule+0xe7/0x3a0 kernel/sched/core.c:6960
 schedule_timeout+0x123/0x290 kernel/time/sleep_timeout.c:99
 rcu_gp_fqs_loop+0x1ea/0xaf0 kernel/rcu/tree.c:2083
 rcu_gp_kthread+0x26d/0x380 kernel/rcu/tree.c:2285
 kthread+0x3c5/0x780 kernel/kthread.c:463
 ret_from_fork+0x983/0xb10 arch/x86/kernel/process.c:158
 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:246
 </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: 10013 Comm: syz.2.579 Tainted: G             L      syzkaller #0 PREEMPT(full) 
Tainted: [L]=SOFTLOCKUP
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/25/2025
RIP: 0010:mark_usage kernel/locking/lockdep.c:4639 [inline]
RIP: 0010:__lock_acquire+0xbf0/0x2890 kernel/locking/lockdep.c:5191
Code: 0f 83 56 08 00 00 48 8d 04 80 48 8d 04 80 48 8d 04 c5 60 4a b8 95 48 83 78 40 00 0f 85 af fa ff ff 90 0f 0b 90 e9 a6 fa ff ff <31> d2 4c 89 f6 4c 89 e7 4c 89 5c 24 10 4c 89 4c 24 08 e8 a9 e7 ff
RSP: 0018:ffffc90000007ce8 EFLAGS: 00000002
RAX: 0000000000000001 RBX: 0000000000000000 RCX: 0000000000000040
RDX: 0000000000000002 RSI: 0000000000000000 RDI: ffff8880b8428458
RBP: 0000000000000000 R08: 0000000000080000 R09: 000000000000006f
R10: 0000000000000001 R11: ffff88803445aff0 R12: ffff88803445a4c0
R13: 0000000000000002 R14: ffff88803445aff0 R15: 0000000000000001
FS:  0000555569792500(0000) GS:ffff888124909000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 000000110c39b2f4 CR3: 0000000076579000 CR4: 00000000003526f0
Call Trace:
 <IRQ>
 lock_acquire kernel/locking/lockdep.c:5868 [inline]
 lock_acquire+0x179/0x330 kernel/locking/lockdep.c:5825
 __raw_spin_lock_irq include/linux/spinlock_api_smp.h:119 [inline]
 _raw_spin_lock_irq+0x36/0x50 kernel/locking/spinlock.c:170
 __run_hrtimer kernel/time/hrtimer.c:1781 [inline]
 __hrtimer_run_queues+0x2bc/0xc40 kernel/time/hrtimer.c:1841
 hrtimer_interrupt+0x397/0x8e0 kernel/time/hrtimer.c:1903
 local_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1045 [inline]
 __sysvec_apic_timer_interrupt+0x10b/0x3c0 arch/x86/kernel/apic/apic.c:1062
 instr_sysvec_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1056 [inline]
 sysvec_apic_timer_interrupt+0x9f/0xc0 arch/x86/kernel/apic/apic.c:1056
 </IRQ>
 <TASK>
 asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:697
RIP: 0010:finish_task_switch.isra.0+0x210/0xbd0 kernel/sched/core.c:5114
Code: ac 08 00 00 44 8b 05 b3 0c fd 0e 45 85 c0 0f 85 be 01 00 00 4c 89 e7 e8 ae f6 ff ff e8 39 eb 3b 00 fb 65 48 8b 1d 38 54 26 12 <48> 8d bb 48 16 00 00 48 b8 00 00 00 00 00 fc ff df 48 89 fa 48 c1
RSP: 0018:ffffc9000425f958 EFLAGS: 00000206
RAX: 000000000000067b RBX: ffff88803445a4c0 RCX: ffffffff81c7061f
RDX: 0000000000000000 RSI: ffffffff8dac204b RDI: ffffffff8bf24280
RBP: ffffc9000425f9a0 R08: 0000000000000001 R09: 0000000000000001
R10: ffffffff9087f7d7 R11: ffff88803445aff0 R12: ffff8880b843ac80
R13: ffff8880356ac980 R14: ffff8880356ac980 R15: ffff8880b843bab0
 context_switch kernel/sched/core.c:5259 [inline]
 __schedule+0x1141/0x6150 kernel/sched/core.c:6863
 preempt_schedule_common+0x44/0xc0 kernel/sched/core.c:7047
 preempt_schedule_thunk+0x16/0x30 arch/x86/entry/thunk.S:12
 class_preempt_destructor include/linux/preempt.h:468 [inline]
 try_to_wake_up+0xa67/0x1860 kernel/sched/core.c:4070
 wake_up_process kernel/sched/core.c:4349 [inline]
 wake_up_q+0xa1/0x130 kernel/sched/core.c:1087
 futex_wake+0x460/0x530 kernel/futex/waitwake.c:198
 do_futex+0x1e3/0x350 kernel/futex/syscalls.c:135
 __do_sys_futex kernel/futex/syscalls.c:207 [inline]
 __se_sys_futex kernel/futex/syscalls.c:188 [inline]
 __x64_sys_futex+0x1e0/0x4c0 kernel/futex/syscalls.c:188
 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
 do_syscall_64+0xcd/0xf80 arch/x86/entry/syscall_64.c:94
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7ff99338f749
Code: ff ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 40 00 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 a8 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007fff061d7cb8 EFLAGS: 00000246 ORIG_RAX: 00000000000000ca
RAX: ffffffffffffffda RBX: 00007ff9935e5fa8 RCX: 00007ff99338f749
RDX: 00000000000f4240 RSI: 0000000000000081 RDI: 00007ff9935e5fa8
RBP: 0000000000000000 R08: 0000000000000007 R09: 00000015061d7faf
R10: 00007ff9935e5fa0 R11: 0000000000000246 R12: 00007ff9935e5fac
R13: 00007ff9935e5fa0 R14: 00000000000000e8 R15: 0000000000000002
 </TASK>