rcu: INFO: rcu_preempt self-detected stall on CPU
rcu: 	0-....: (1 GPs behind) idle=fd84/1/0x4000000000000000 softirq=64214/64215 fqs=5233
rcu: 	         hardirqs   softirqs   csw/system
rcu: 	 number:     6035          0            0
rcu: 	cputime:      147      52342            2   ==> 52490(ms)
rcu: 	(t=10500 jiffies g=61853 q=1440 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:__sanitizer_cov_trace_pc+0x0/0x70 kernel/kcov.c:210
Code: 89 fb e8 23 00 00 00 48 8b 3d 54 0e da 0b 48 89 de 5b e9 b3 fb 5a 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 10 80 92 65 8b 15 58 18
RSP: 0018:ffffc90000007cd0 EFLAGS: 00000283
RAX: ffffffff89707340 RBX: 0000000000000000 RCX: ffff88801c2bbd00
RDX: 0000000000000100 RSI: 0000000000000010 RDI: 0000000000000009
RBP: 1ffff11010b3646a R08: ffffffff896fcc56 R09: ffffffff8df41aa0
R10: 0000000000000001 R11: ffffffff89631050 R12: dffffc0000000000
R13: ffff8880859b2354 R14: 0000000000000010 R15: 0000000000000002
FS:  0000000000000000(0000) GS:ffff888125e1f000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 000000110c24b908 CR3: 0000000077e86000 CR4: 00000000003526f0
Call Trace:
 <IRQ>
 taprio_dequeue_tc_priority+0x187/0x750 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:5782
 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:lockdep_unregister_key+0x2ce/0x350 kernel/locking/lockdep.c:6616
Code: 41 5d 41 5e 41 5f 5d e9 50 f1 08 00 89 c7 e8 79 07 00 00 e9 6c fe ff ff e8 8f 8e bb 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: 00000202
RAX: 0000000000000046 RBX: 0000000000000001 RCX: 0000000000000046
RDX: ffffffff9343c3d8 RSI: ffffffff8d7a6c59 RDI: ffffffff8bc08360
RBP: ffff88801c2bbd01 R08: ffffffff81ab3a98 R09: ffffffff8df41aa0
R10: dffffc0000000000 R11: fffffbfff1f0446f R12: 0000000000000000
R13: ffff888058992939 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