sched: DL replenish lagged too much
rcu: INFO: rcu_preempt self-detected stall on CPU
rcu: 	1-....: (1 GPs behind) idle=0804/1/0x4000000000000000 softirq=0/0 fqs=5250 rcuc=10504 jiffies(starved)
rcu: 	         hardirqs   softirqs   csw/system
rcu: 	 number:   827188    1632488         8458
rcu: 	cputime:     1150      50037         1278   ==> 52490(ms)
rcu: 	(t=10501 jiffies g=11869 q=1855 ncpus=2)
CPU: 1 UID: 0 PID: 30 Comm: ktimers/1 Not tainted syzkaller #0 PREEMPT_{RT,(full)} 
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 04/18/2026
RIP: 0010:lock_acquire+0x221/0x350 kernel/locking/lockdep.c:5874
Code: ff ff ff e8 01 12 8f 09 f7 44 24 08 00 02 00 00 0f 84 3a ff ff ff 65 48 8b 05 3b 7c d4 10 48 3b 44 24 58 75 33 fb 48 83 c4 60 <5b> 41 5c 41 5d 41 5e 41 5f 5d c3 cc cc cc cc cc 48 8d 3d b8 7c ef
RSP: 0018:ffffc90000a4f9e0 EFLAGS: 00000282
RAX: 05bc23543a751f00 RBX: 0000000000000000 RCX: 0000000000000046
RDX: 00000000ef863900 RSI: ffffffff8d8af3ac RDI: ffffffff8baa2680
RBP: ffffffff8940d0fa R08: ffffffff8940d0fa R09: ffff8880355ea400
R10: dffffc0000000000 R11: ffffffff8940d040 R12: 0000000000000000
R13: ffff8880355ea400 R14: 0000000000000001 R15: 0000000000000246
FS:  0000000000000000(0000) GS:ffff888125fcd000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00002000000012c0 CR3: 00000000333e8000 CR4: 00000000003526f0
Call Trace:
 <TASK>
 rt_spin_lock+0x83/0x400 kernel/locking/spinlock_rt.c:56
 spin_lock include/linux/spinlock_rt.h:45 [inline]
 advance_sched+0xba/0xc20 net/sched/sch_taprio.c:930
 __run_hrtimer kernel/time/hrtimer.c:2032 [inline]
 __hrtimer_run_queues+0x405/0xb10 kernel/time/hrtimer.c:2096
 hrtimer_run_softirq+0x18f/0x260 kernel/time/hrtimer.c:2113
 handle_softirqs+0x1de/0x6d0 kernel/softirq.c:626
 __do_softirq kernel/softirq.c:660 [inline]
 run_ktimerd+0x69/0x100 kernel/softirq.c:1155
 smpboot_thread_fn+0x541/0xa50 kernel/smpboot.c:160
 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>
NMI backtrace for cpu 1
CPU: 1 UID: 0 PID: 30 Comm: ktimers/1 Not tainted syzkaller #0 PREEMPT_{RT,(full)} 
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 04/18/2026
RIP: 0010:hlock_class kernel/locking/lockdep.c:234 [inline]
RIP: 0010:__lock_acquire+0xa54/0x2d10 kernel/locking/lockdep.c:5236
Code: c7 c6 76 44 76 8d 67 48 0f b9 3a 90 31 c0 48 83 78 40 00 0f 84 7f 1d 00 00 41 8b 45 20 25 ff 1f 00 00 48 0f a3 05 5c 35 dc 11 <73> 10 48 69 c0 c8 00 00 00 48 8d 80 d0 f4 1d 93 eb 32 83 3d 63 c5
RSP: 0018:ffffc90000a4f820 EFLAGS: 00000003
RAX: 000000000000003b RBX: 0000000038ebeb42 RCX: 00000000e859cf28
RDX: 0000000002a9b450 RSI: 0000000061650717 RDI: ffff88801de91f00
RBP: 162a0c9600000000 R08: ffffffff8b321997 R09: ffff8880355ea3c0
R10: dffffc0000000000 R11: fffffbfff1f19f3f R12: ffff88801de92bc8
R13: ffff88801de92bc8 R14: ffff88801de91f00 R15: 0000000000000005
FS:  0000000000000000(0000) GS:ffff888125fcd000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00002000000012c0 CR3: 00000000333e8000 CR4: 00000000003526f0
Call Trace:
 <TASK>
 lock_acquire+0x106/0x350 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
 rtlock_slowlock kernel/locking/rtmutex.c:1917 [inline]
 rtlock_lock kernel/locking/spinlock_rt.c:43 [inline]
 __rt_spin_lock kernel/locking/spinlock_rt.c:49 [inline]
 rt_spin_lock+0x157/0x400 kernel/locking/spinlock_rt.c:57
 spin_lock include/linux/spinlock_rt.h:45 [inline]
 advance_sched+0xba/0xc20 net/sched/sch_taprio.c:930
 __run_hrtimer kernel/time/hrtimer.c:2032 [inline]
 __hrtimer_run_queues+0x405/0xb10 kernel/time/hrtimer.c:2096
 hrtimer_run_softirq+0x18f/0x260 kernel/time/hrtimer.c:2113
 handle_softirqs+0x1de/0x6d0 kernel/softirq.c:626
 __do_softirq kernel/softirq.c:660 [inline]
 run_ktimerd+0x69/0x100 kernel/softirq.c:1155
 smpboot_thread_fn+0x541/0xa50 kernel/smpboot.c:160
 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>