rcu: INFO: rcu_preempt detected stalls on CPUs/tasks:
rcu: 	(detected by 0, t=10502 jiffies, g=14441, q=636 ncpus=2)
rcu: All QSes seen, last rcu_preempt kthread activity 10498 (4294960326-4294949828), jiffies_till_next_fqs=1, root ->qsmask 0x0
rcu: rcu_preempt kthread starved for 10498 jiffies! g14441 f0x2 RCU_GP_WAIT_FQS(5) ->state=0x0 ->cpu=1
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:27136 pid:16    tgid:16    ppid:2      task_flags:0x208040 flags:0x00080000
Call Trace:
 <TASK>
 context_switch kernel/sched/core.c:5256 [inline]
 __schedule+0x14bc/0x5000 kernel/sched/core.c:6863
 __schedule_loop kernel/sched/core.c:6945 [inline]
 schedule+0x165/0x360 kernel/sched/core.c:6960
 schedule_timeout+0x12b/0x270 kernel/time/sleep_timeout.c:99
 rcu_gp_fqs_loop+0x301/0x1540 kernel/rcu/tree.c:2083
 rcu_gp_kthread+0x99/0x390 kernel/rcu/tree.c:2285
 kthread+0x711/0x8a0 kernel/kthread.c:463
 ret_from_fork+0x599/0xb30 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 0 to CPUs 1:
NMI backtrace for cpu 1
CPU: 1 UID: 0 PID: 6138 Comm: syz.4.25 Not tainted syzkaller #0 PREEMPT(full) 
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/25/2025
RIP: 0010:_raw_spin_unlock_irqrestore+0x32/0x110 kernel/locking/spinlock.c:193
Code: 41 57 41 56 41 54 53 48 83 e4 e0 48 83 ec 60 48 89 f3 49 89 fe 65 48 8b 05 6b 61 20 07 48 89 44 24 48 48 c7 04 24 b3 8a b5 41 <48> c7 44 24 08 25 ba 80 8d 48 c7 44 24 10 90 4e 5e 8b 49 89 e7 49
RSP: 0018:ffffc90000a08c80 EFLAGS: 00000082
RAX: a5e34cc5ea902000 RBX: 0000000000000016 RCX: 0000000000000003
RDX: ffff888078026ef0 RSI: 0000000000000016 RDI: ffffffff99aa6d48
RBP: ffffc90000a08d08 R08: 0000000000000003 R09: 0000000000000004
R10: dffffc0000000000 R11: fffff52000141174 R12: ffff88803447a718
R13: dffffc0000000000 R14: ffffffff99aa6d48 R15: ffff8880b87282c0
FS:  000055557faa1500(0000) GS:ffff888125f35000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000001b30363fff CR3: 000000007868b000 CR4: 0000000000350ef0
Call Trace:
 <IRQ>
 debug_hrtimer_deactivate kernel/time/hrtimer.c:443 [inline]
 debug_deactivate+0x1d/0x1e0 kernel/time/hrtimer.c:483
 __run_hrtimer kernel/time/hrtimer.c:1745 [inline]
 __hrtimer_run_queues+0x2b0/0xc30 kernel/time/hrtimer.c:1841
 hrtimer_interrupt+0x45b/0xaa0 kernel/time/hrtimer.c:1903
 local_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1045 [inline]
 __sysvec_apic_timer_interrupt+0x102/0x3e0 arch/x86/kernel/apic/apic.c:1062
 instr_sysvec_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1056 [inline]
 sysvec_apic_timer_interrupt+0xa1/0xc0 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:get_current arch/x86/include/asm/current.h:25 [inline]
RIP: 0010:__sanitizer_cov_trace_pc+0x8/0x70 kernel/kcov.c:216
Code: 8b 3d c4 83 d9 0b 48 89 de 5b e9 03 35 5b 00 cc cc cc 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 f3 0f 1e fa 48 8b 04 24 <65> 48 8b 0c 25 08 b0 7e 92 65 8b 15 c8 fd bc 10 81 e2 00 01 ff 00
RSP: 0018:ffffc900031c7bd8 EFLAGS: 00000286
RAX: ffffffff8165fdd7 RBX: ffffc900031c7f48 RCX: 0000000000000000
RDX: ffff88802f01db80 RSI: 0000000000000000 RDI: 0000000000000000
RBP: ffffc900031c7d50 R08: ffff88802f01db87 R09: 1ffff11005e03b70
R10: dffffc0000000000 R11: ffffed1005e03b71 R12: dffffc0000000000
R13: ffffc900031c7da0 R14: 0000000000000000 R15: 1ffff92000638f98
 sigmask_to_save include/linux/sched/signal.h:559 [inline]
 x64_setup_rt_frame+0xd7/0xd40 arch/x86/kernel/signal_64.c:166
 setup_rt_frame arch/x86/kernel/signal.c:250 [inline]
 handle_signal arch/x86/kernel/signal.c:294 [inline]
 arch_do_signal_or_restart+0x3d1/0x7a0 arch/x86/kernel/signal.c:339
 __exit_to_user_mode_loop kernel/entry/common.c:41 [inline]
 exit_to_user_mode_loop+0x87/0x4f0 kernel/entry/common.c:75
 __exit_to_user_mode_prepare include/linux/irq-entry-common.h:226 [inline]
 syscall_exit_to_user_mode_prepare include/linux/irq-entry-common.h:256 [inline]
 syscall_exit_to_user_mode_work include/linux/entry-common.h:159 [inline]
 syscall_exit_to_user_mode include/linux/entry-common.h:194 [inline]
 do_syscall_64+0x2d0/0xf80 arch/x86/entry/syscall_64.c:100
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7fc1a6c5ef2b
Code: 41 5e c3 0f 1f 40 00 48 8b 44 24 18 48 8b 1c 24 48 8b b0 80 00 00 00 8b 78 08 48 8d 53 30 e8 0c 53 ff ff 48 89 83 88 00 00 00 <e9> 45 fe ff ff 8b 7c 24 14 48 8d 74 24 40 ba 0f 00 00 00 e8 cd f1
RSP: 002b:00007ffea794d1c0 EFLAGS: 00000206
RAX: 0000000000000000 RBX: 00007fc1a6fe5fa0 RCX: 00007fc1a6e13f91
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000000
RBP: 00007fc1a6e13f91 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007fc1a6fe5fa0 R14: 00007fc1a6fe5fa0 R15: 0000000000000004
 </TASK>