rcu: INFO: rcu_preempt detected stalls on CPUs/tasks:
rcu: 	(detected by 1, t=10506 jiffies, g=197565, q=873 ncpus=2)
rcu: All QSes seen, last rcu_preempt kthread activity 10506 (4295079780-4295069274), jiffies_till_next_fqs=1, root ->qsmask 0x0
rcu: rcu_preempt kthread starved for 10506 jiffies! g197565 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:27536 pid:16    tgid:16    ppid:2      task_flags:0x208040 flags:0x00080000
Call Trace:
 <TASK>
 context_switch kernel/sched/core.c:5388 [inline]
 __schedule+0x1821/0x5740 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+0x389/0x470 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: 31198 Comm: syz.2.7407 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:rcu_is_watching_curr_cpu include/linux/context_tracking.h:128 [inline]
RIP: 0010:rcu_is_watching+0x35/0xb0 kernel/rcu/tree.c:752
Code: 05 30 73 8d 11 e8 cb b4 fc 09 89 c3 83 f8 08 73 65 49 bf 00 00 00 00 00 fc ff df 4c 8d 34 dd 90 27 26 8e 4c 89 f0 48 c1 e8 03 <42> 80 3c 38 00 74 08 4c 89 f7 e8 ec 41 86 00 48 c7 c3 d8 79 39 93
RSP: 0018:ffffc90000007ca0 EFLAGS: 00000012
RAX: 1ffffffff1c4c4f2 RBX: 0000000000000000 RCX: 0000000080010005
RDX: 0000000000000001 RSI: ffffffff8c28b8c0 RDI: ffffffff8c28b880
RBP: ffff888034e04558 R08: 0000000000000003 R09: 0000000000000004
R10: dffffc0000000000 R11: fffff52000000f94 R12: ffff888034e04550
R13: ffffffff84bc8a20 R14: ffffffff8e262790 R15: dffffc0000000000
FS:  0000555593625500(0000) GS:ffff88812529c000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000001b34a22ff8 CR3: 00000000574f8000 CR4: 0000000000350ef0
Call Trace:
 <IRQ>
 trace_lock_release include/trace/events/lock.h:69 [inline]
 lock_release+0x4b/0x3c0 kernel/locking/lockdep.c:5879
 __raw_spin_unlock_irqrestore include/linux/spinlock_api_smp.h:176 [inline]
 _raw_spin_unlock_irqrestore+0x1b/0x80 kernel/locking/spinlock.c:198
 debug_object_activate+0x320/0x580 lib/debugobjects.c:863
 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:__raw_spin_unlock_irqrestore include/linux/spinlock_api_smp.h:179 [inline]
RIP: 0010:_raw_spin_unlock_irqrestore+0x47/0x80 kernel/locking/spinlock.c:198
Code: f7 e8 9d 38 f8 f5 f7 c3 00 02 00 00 74 05 e8 d0 d2 23 f6 9c 58 a9 00 02 00 00 75 27 f7 c3 00 02 00 00 74 01 fb bf 01 00 00 00 <e8> b4 b7 e9 f5 65 8b 05 ad 2e 8e 07 85 c0 74 18 5b 41 5e e9 7c 2f
RSP: 0018:ffffc90003dd7b20 EFLAGS: 00000206
RAX: 0000000000000002 RBX: 0000000000000287 RCX: 0000000080000002
RDX: 0000000000000000 RSI: ffffffff8dfa4398 RDI: 0000000000000001
RBP: ffff88801db68000 R08: ffffffff90302af7 R09: 1ffffffff206055e
R10: dffffc0000000000 R11: fffffbfff206055f R12: dffffc0000000000
R13: 1ffff110170c77a4 R14: ffff88801db68a70 R15: ffff8880b863bd20
 class_raw_spinlock_irqsave_destructor include/linux/spinlock.h:571 [inline]
 try_to_wake_up+0x7b4/0x1380 kernel/sched/core.c:4190
 wake_up_process kernel/sched/core.c:4434 [inline]
 wake_up_q+0x85/0xd0 kernel/sched/core.c:1158
 futex_wake+0x49a/0x580 kernel/futex/waitwake.c:198
 do_futex+0x395/0x420 kernel/futex/syscalls.c:135
 __do_sys_futex kernel/futex/syscalls.c:207 [inline]
 __se_sys_futex+0x3a8/0x450 kernel/futex/syscalls.c:188
 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
 do_syscall_64+0x174/0x580 arch/x86/entry/syscall_64.c:94
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f69c1b9ce59
Code: ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 44 00 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 e8 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007ffc6f625928 EFLAGS: 00000246 ORIG_RAX: 00000000000000ca
RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 00007f69c1b9ce59
RDX: 00000000000f4240 RSI: 0000000000000081 RDI: 00007f69c1e15fa8
RBP: 000000000000006e R08: 0000000000000018 R09: 0000000000000000
R10: 00007f69c1e15fa0 R11: 0000000000000246 R12: 0000000000000000
R13: 00007f69c1e15fac R14: 00007f69c1e15fa8 R15: 00007f69c1e15fa0
 </TASK>