sched: DL replenish lagged too much
rcu: INFO: rcu_preempt detected stalls on CPUs/tasks:
rcu: 	1-...!: (2 ticks this GP) idle=e9dc/1/0x4000000000000000 softirq=22719/22719 fqs=0
rcu: 	(detected by 0, t=10502 jiffies, g=16597, q=373 ncpus=2)
Sending NMI from CPU 0 to CPUs 1:
NMI backtrace for cpu 1
CPU: 1 UID: 0 PID: 12 Comm: kworker/u8:0 Not tainted syzkaller #0 PREEMPT(full) 
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/02/2025
Workqueue: events_unbound linkwatch_event
RIP: 0010:hlock_class kernel/locking/lockdep.c:234 [inline]
RIP: 0010:mark_lock+0x3c/0x190 kernel/locking/lockdep.c:4731
Code: 00 03 00 83 f9 01 bb 09 00 00 00 83 db 00 83 fa 08 0f 45 da bd 01 00 00 00 89 d9 d3 e5 25 ff 1f 00 00 48 0f a3 05 94 a9 dd 11 <73> 10 48 69 c0 c8 00 00 00 48 8d 88 70 93 1c 93 eb 48 83 3d 1b 39
RSP: 0018:ffffc90000a08b38 EFLAGS: 00000003
RAX: 000000000000006e RBX: 0000000000000000 RCX: 0000000000000000
RDX: 0000000000000000 RSI: ffff88801d6ce668 RDI: ffff88801d6cdac0
RBP: 0000000000000001 R08: 0000000000000000 R09: ffffffff81ae2c62
R10: dffffc0000000000 R11: fffffbfff1efae8f R12: 0000000000000002
R13: 0000000000000002 R14: ffff88801d6ce668 R15: 0000000000000000
FS:  0000000000000000(0000) GS:ffff888125fe2000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f978655c340 CR3: 00000000798e4000 CR4: 00000000003526f0
Call Trace:
 <IRQ>
 mark_usage kernel/locking/lockdep.c:4639 [inline]
 __lock_acquire+0x65a/0xd20 kernel/locking/lockdep.c:5191
 lock_acquire+0x120/0x360 kernel/locking/lockdep.c:5868
 __raw_spin_lock_irq include/linux/spinlock_api_smp.h:119 [inline]
 _raw_spin_lock_irq+0xa2/0xf0 kernel/locking/spinlock.c:170
 __run_hrtimer kernel/time/hrtimer.c:1781 [inline]
 __hrtimer_run_queues+0x602/0xc60 kernel/time/hrtimer.c:1841
 hrtimer_interrupt+0x45b/0xaa0 kernel/time/hrtimer.c:1903
 local_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1041 [inline]
 __sysvec_apic_timer_interrupt+0x10b/0x410 arch/x86/kernel/apic/apic.c:1058
 instr_sysvec_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1052 [inline]
 sysvec_apic_timer_interrupt+0xa1/0xc0 arch/x86/kernel/apic/apic.c:1052
 </IRQ>
 <TASK>
 asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:697
RIP: 0010:ip6_route_add+0x0/0x1b0 net/ipv6/route.c:3930
Code: 83 c4 10 5b 41 5c 41 5d 41 5e 41 5f 5d e9 58 1b 51 01 cc e8 32 78 b9 f7 eb e5 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 <0f> 1f 40 d6 55 41 57 41 56 41 55 41 54 53 49 89 d7 89 f5 49 89 fc
RSP: 0018:ffffc900001174b8 EFLAGS: 00000246
RAX: ffff88804b170000 RBX: ffff88805da2a108 RCX: ffff88801d6cdac0
RDX: 0000000000000000 RSI: 0000000000000cc0 RDI: ffffc900001174e0
RBP: ffffc90000117630 R08: 0000000000000000 R09: ffffffff8a03f6b8
R10: ffffc900001174e8 R11: fffff52000022eb2 R12: 1ffff92000022e98
R13: dffffc0000000000 R14: ffff88805da3a000 R15: 0000000000000000
 addrconf_add_mroute net/ipv6/addrconf.c:2552 [inline]
 addrconf_add_dev+0x24f/0x340 net/ipv6/addrconf.c:2570
 addrconf_dev_config net/ipv6/addrconf.c:3479 [inline]
 addrconf_init_auto_addrs+0x572/0xaa0 net/ipv6/addrconf.c:3567
 addrconf_notify+0xb41/0x1080 net/ipv6/addrconf.c:3740
 notifier_call_chain+0x1b6/0x3e0 kernel/notifier.c:85
 netif_state_change+0x284/0x3a0 net/core/dev.c:1584
 linkwatch_do_dev+0x124/0x180 net/core/link_watch.c:186
 __linkwatch_run_queue+0x56a/0x7e0 net/core/link_watch.c:244
 linkwatch_event+0x4c/0x60 net/core/link_watch.c:304
 process_one_work+0x94a/0x15d0 kernel/workqueue.c:3267
 process_scheduled_works kernel/workqueue.c:3350 [inline]
 worker_thread+0x9b0/0xee0 kernel/workqueue.c:3431
 kthread+0x711/0x8a0 kernel/kthread.c:463
 ret_from_fork+0x4bc/0x870 arch/x86/kernel/process.c:158
 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245
 </TASK>
rcu: rcu_preempt kthread timer wakeup didn't happen for 10501 jiffies! g16597 f0x0 RCU_GP_WAIT_FQS(5) ->state=0x402
rcu: 	Possible timer handling issue on cpu=1 timer-softirq=7513
rcu: rcu_preempt kthread starved for 10502 jiffies! g16597 f0x0 RCU_GP_WAIT_FQS(5) ->state=0x402 ->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:I stack:27816 pid:16    tgid:16    ppid:2      task_flags:0x208040 flags:0x00080000
Call Trace:
 <TASK>
 context_switch kernel/sched/core.c:5254 [inline]
 __schedule+0x17c4/0x4d60 kernel/sched/core.c:6862
 __schedule_loop kernel/sched/core.c:6944 [inline]
 schedule+0x165/0x360 kernel/sched/core.c:6959
 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+0x4bc/0x870 arch/x86/kernel/process.c:158
 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245
 </TASK>