rcu: INFO: rcu_preempt self-detected stall on CPU
rcu: 	0-....: (10499 ticks this GP) idle=66ac/1/0x4000000000000000 softirq=80161/80161 fqs=5222
rcu: 	         hardirqs   softirqs   csw/system
rcu: 	 number:     8256          0            0
rcu: 	cputime:      242      52247            6   ==> 52490(ms)
rcu: 	(t=10500 jiffies g=60965 q=4174 ncpus=2)
CPU: 0 UID: 0 PID: 3 Comm: pool_workqueue_ Not tainted syzkaller #0 PREEMPT(full) 
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/25/2025
RIP: 0010:qdisc_dev include/net/sch_generic.h:594 [inline]
RIP: 0010:taprio_dequeue_from_txq+0x64/0x980 net/sched/sch_taprio.c:711
Code: 74 08 4c 89 ef e8 5c 4f b6 f8 4c 8d a3 80 02 00 00 4d 8b 6d 00 4c 89 e8 48 c1 e8 03 48 b9 00 00 00 00 00 fc ff df 80 3c 08 00 <74> 08 4c 89 ef e8 32 4f b6 f8 4d 8b 6d 00 4c 89 e0 48 c1 e8 03 48
RSP: 0018:ffffc90000007c70 EFLAGS: 00000246
RAX: 1ffff1100f057000 RBX: ffff88804cc3b000 RCX: dffffc0000000000
RDX: 0000000000000100 RSI: 000000000000000b RDI: ffff88804cc3b000
RBP: 1ffff1100998766a R08: ffffffff89702086 R09: ffffffff8df41aa0
R10: 0000000000000001 R11: ffffffff89634ae0 R12: ffff88804cc3b280
R13: ffff8880782b8000 R14: ffff88807e970c00 R15: 000000000000000b
FS:  0000000000000000(0000) GS:ffff888125e1c000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00002000000012c0 CR3: 000000004cbf6000 CR4: 00000000003526f0
Call Trace:
 <IRQ>
 taprio_dequeue_tc_priority+0x1ac/0x750 net/sched/sch_taprio.c:793
 taprio_dequeue+0x186/0x550 net/sched/sch_taprio.c:-1
 dequeue_skb net/sched/sch_generic.c:297 [inline]
 qdisc_restart net/sched/sch_generic.c:402 [inline]
 __qdisc_run+0x23f/0x1510 net/sched/sch_generic.c:420
 qdisc_run+0xc7/0x300 include/net/pkt_sched.h:120
 net_tx_action+0x717/0x900 net/core/dev.c:5795
 handle_softirqs+0x22b/0x7c0 kernel/softirq.c:622
 __do_softirq kernel/softirq.c:656 [inline]
 invoke_softirq kernel/softirq.c:496 [inline]
 __irq_exit_rcu+0x60/0x150 kernel/softirq.c:723
 irq_exit_rcu+0x9/0x30 kernel/softirq.c:739
 instr_sysvec_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1056 [inline]
 sysvec_apic_timer_interrupt+0xa6/0xc0 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:preempt_schedule_irq+0x48/0xa0 kernel/sched/core.c:7190
Code: 49 be 00 00 00 00 00 fc ff df eb 09 48 f7 03 10 00 00 00 74 54 bf 01 00 00 00 e8 73 3b 35 f6 e8 5e 51 6d f6 fb bf 01 00 00 00 <e8> c3 a9 ff ff 9c 58 fa a9 00 02 00 00 74 05 e8 e4 52 6d f6 bf 01
RSP: 0018:ffffc90000087ae8 EFLAGS: 00000206
RAX: 000000000000a209 RBX: 0000000000000000 RCX: 0000000000000001
RDX: 0000000000000000 RSI: ffffffff8d793c31 RDI: 0000000000000001
RBP: 0000000000000000 R08: ffffffff8f822d77 R09: 1ffffffff1f045ae
R10: dffffc0000000000 R11: fffffbfff1f045af R12: 0000000000000000
R13: 0000000000000000 R14: dffffc0000000000 R15: 0000000000000000
 irqentry_exit+0x5e3/0x670 kernel/entry/common.c:216
 asm_sysvec_reschedule_ipi+0x1a/0x20 arch/x86/include/asm/idtentry.h:702
RIP: 0010:lockdep_unregister_key+0x2ce/0x350 kernel/locking/lockdep.c:6616
Code: 41 5d 41 5e 41 5f 5d e9 a0 f1 08 00 89 c7 e8 79 07 00 00 e9 6c fe ff ff e8 df 0d bc 09 41 f7 c7 00 02 00 00 74 bb fb 40 84 ed <75> ba eb cb 90 0f 0b 90 e9 2e ff ff ff 90 0f 0b 90 e9 36 ff ff ff
RSP: 0018:ffffc90000087c08 EFLAGS: 00000246
RAX: 0000000000000046 RBX: ffff888054136938 RCX: 0000000000000046
RDX: ffffffff9343f3d8 RSI: ffffffff8d7a85e9 RDI: ffffffff8bc086e0
RBP: ffff888140a83d00 R08: ffffffff81ab3b98 R09: ffffffff8df41aa0
R10: dffffc0000000000 R11: fffffbfff1f045af R12: 0000000000000000
R13: ffff888054136939 R14: 0000000000001000 R15: 0000000000000a03
 wq_unregister_lockdep kernel/workqueue.c:4852 [inline]
 pwq_release_workfn+0x6d5/0x870 kernel/workqueue.c:5148
 kthread_worker_fn+0x4f0/0xb20 kernel/kthread.c:1005
 kthread+0x711/0x8a0 kernel/kthread.c:463
 ret_from_fork+0x510/0xa50 arch/x86/kernel/process.c:158
 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:246
 </TASK>
sched: DL replenish lagged too much