rcu: INFO: rcu_preempt detected stalls on CPUs/tasks:
rcu: 	(detected by 0, t=10504 jiffies, g=26621, q=812 ncpus=2)
rcu: All QSes seen, last rcu_preempt kthread activity 10500 (4294969926-4294959426), jiffies_till_next_fqs=1, root ->qsmask 0x0
rcu: rcu_preempt kthread starved for 10500 jiffies! g26621 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:26976 pid:16    tgid:16    ppid:2      task_flags:0x208040 flags:0x00004000
Call Trace:
 <TASK>
 context_switch kernel/sched/core.c:5382 [inline]
 __schedule+0x1b88/0x5240 kernel/sched/core.c:6767
 __schedule_loop kernel/sched/core.c:6845 [inline]
 schedule+0x163/0x360 kernel/sched/core.c:6860
 schedule_timeout+0x15b/0x2b0 kernel/time/sleep_timeout.c:99
 rcu_gp_fqs_loop+0x2e1/0x1340 kernel/rcu/tree.c:2046
 rcu_gp_kthread+0xa7/0x3b0 kernel/rcu/tree.c:2248
 kthread+0x7b9/0x940 kernel/kthread.c:464
 ret_from_fork+0x4d/0x80 arch/x86/kernel/process.c:153
 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 0 to CPUs 1:
NMI backtrace for cpu 1
CPU: 1 UID: 0 PID: 8818 Comm: syz.0.991 Not tainted 6.15.0-rc1-syzkaller-00025-gbec7dcbc242c #0 PREEMPT(full) 
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 02/12/2025
RIP: 0010:debug_lockdep_rcu_enabled+0x16/0x40 kernel/rcu/update.c:320
Code: 0f 1f 40 00 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 f3 0f 1e fa 31 c0 83 3d 87 58 2f 04 00 74 1e 83 3d 5a 86 2f 04 00 <74> 15 65 48 8b 0c 25 08 a0 68 93 31 c0 83 b9 ec 0a 00 00 00 0f 94
RSP: 0018:ffffc90000a08c68 EFLAGS: 00000002
RAX: 0000000000000000 RBX: ffff88805be38036 RCX: 0000000000000001
RDX: dffffc0000000000 RSI: 0000000000000004 RDI: ffffc90000a08be0
RBP: dffffc0000000000 R08: 0000000000000003 R09: fffff5200014117c
R10: dffffc0000000000 R11: fffff5200014117c R12: 0000000000000002
R13: ffffffff8a26c2a0 R14: ffff88805c2d7340 R15: ffff88803118e4d8
FS:  0000555570467500(0000) GS:ffff888125096000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 000000110c380b18 CR3: 0000000059348000 CR4: 0000000000350ef0
Call Trace:
 <IRQ>
 advance_sched+0xb0/0xca0 net/sched/sch_taprio.c:925
 __run_hrtimer kernel/time/hrtimer.c:1761 [inline]
 __hrtimer_run_queues+0x5a8/0xd40 kernel/time/hrtimer.c:1825
 hrtimer_interrupt+0x403/0xa40 kernel/time/hrtimer.c:1887
 local_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1038 [inline]
 __sysvec_apic_timer_interrupt+0x112/0x420 arch/x86/kernel/apic/apic.c:1055
 instr_sysvec_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1049 [inline]
 sysvec_apic_timer_interrupt+0xa1/0xc0 arch/x86/kernel/apic/apic.c:1049
 </IRQ>
 <TASK>
 asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:702
RIP: 0010:__raw_spin_unlock_irqrestore include/linux/spinlock_api_smp.h:152 [inline]
RIP: 0010:_raw_spin_unlock_irqrestore+0xd9/0x140 kernel/locking/spinlock.c:194
Code: 9c 8f 44 24 20 42 80 3c 2b 00 74 08 4c 89 f7 e8 3d 3b fa f5 f6 44 24 21 02 75 55 41 f7 c7 00 02 00 00 74 01 fb bf 01 00 00 00 <e8> a2 48 5d f5 65 8b 05 cb 5d 35 07 85 c0 74 46 48 c7 04 24 0e 36
RSP: 0018:ffffc90004717c20 EFLAGS: 00000206
RAX: 794619e88e431100 RBX: 1ffff920008e2f88 RCX: ffffffff81cb469c
RDX: 0000000000000000 RSI: ffffffff8e69c6c2 RDI: 0000000000000001
RBP: ffffc90004717cc0 R08: ffffffff905fe077 R09: 1ffffffff20bfc0e
R10: dffffc0000000000 R11: fffffbfff20bfc0f R12: 1ffff920008e2f84
R13: dffffc0000000000 R14: ffffc90004717c40 R15: 0000000000000246
 spin_unlock_irqrestore include/linux/spinlock.h:406 [inline]
 alarm_try_to_cancel+0x131/0x3c0 kernel/time/alarmtimer.c:411
 alarm_cancel+0x16/0x60 kernel/time/alarmtimer.c:428
 timerfd_release+0x1b1/0x250 fs/timerfd.c:239
 __fput+0x3eb/0x9f0 fs/file_table.c:465
 task_work_run+0x253/0x310 kernel/task_work.c:227
 resume_user_mode_work include/linux/resume_user_mode.h:50 [inline]
 exit_to_user_mode_loop kernel/entry/common.c:114 [inline]
 exit_to_user_mode_prepare include/linux/entry-common.h:329 [inline]
 __syscall_exit_to_user_mode_work kernel/entry/common.c:207 [inline]
 syscall_exit_to_user_mode+0x13f/0x340 kernel/entry/common.c:218
 do_syscall_64+0x100/0x230 arch/x86/entry/syscall_64.c:100
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7faf3678d169
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:00007ffc2a2a1108 EFLAGS: 00000246 ORIG_RAX: 00000000000001b4
RAX: 0000000000000000 RBX: 00000000000364fe RCX: 00007faf3678d169
RDX: 0000000000000000 RSI: 000000000000001e RDI: 0000000000000003
RBP: 00007faf369a7ba0 R08: 0000000000000001 R09: 000000042a2a13ff
R10: 00007faf36600000 R11: 0000000000000246 R12: 00007faf369a5fac
R13: 00007faf369a5fa0 R14: ffffffffffffffff R15: 00007ffc2a2a1220
 </TASK>