rcu: INFO: rcu_preempt self-detected stall on CPU
rcu: 	1-....: (1 GPs behind) idle=129c/0/0x3 softirq=71941/71942 fqs=5250
rcu: 	         hardirqs   softirqs   csw/system
rcu: 	 number:     8459          0            0
rcu: 	cputime:      134      52365            0   ==> 52520(ms)
rcu: 	(t=10503 jiffies g=64533 q=3430 ncpus=2)
CPU: 1 UID: 0 PID: 0 Comm: swapper/1 Not tainted syzkaller #0 PREEMPT(full) 
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/25/2025
RIP: 0010:check_kcov_mode kernel/kcov.c:183 [inline]
RIP: 0010:write_comp_data kernel/kcov.c:246 [inline]
RIP: 0010:__sanitizer_cov_trace_cmp4+0x2f/0x90 kernel/kcov.c:288
Code: 8b 04 24 65 48 8b 14 25 08 40 80 92 65 8b 0d a8 45 bf 10 81 e1 00 01 ff 00 74 11 81 f9 00 01 00 00 75 5b 83 ba 6c 16 00 00 00 <74> 52 8b 8a 48 16 00 00 83 f9 03 75 47 48 8b 8a 50 16 00 00 44 8b
RSP: 0018:ffffc90000a08cd0 EFLAGS: 00000246
RAX: ffffffff8970c6ac RBX: 000000000000000c RCX: 0000000000000100
RDX: ffff88801cab5b80 RSI: 000000000000000c RDI: 000000000000000a
RBP: 1ffff1100569be6a R08: ffffffff89702086 R09: ffffffff8df41aa0
R10: 0000000000000001 R11: ffffffff89634ae0 R12: dffffc0000000000
R13: ffff88802b4df354 R14: 000000000000000a R15: 0000000000000008
FS:  0000000000000000(0000) GS:ffff888125f1c000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 000055557c8ea808 CR3: 000000002990c000 CR4: 00000000003526f0
Call Trace:
 <IRQ>
 taprio_next_tc_txq net/sched/sch_taprio.c:769 [inline]
 taprio_dequeue_tc_priority+0x20c/0x750 net/sched/sch_taprio.c:796
 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:pv_native_safe_halt+0x13/0x20 arch/x86/kernel/paravirt.c:82
Code: cc cc cc cc cc cc cc 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 f3 0f 1e fa 66 90 0f 00 2d 53 11 0e 00 f3 0f 1e fa fb f4 <e9> 08 e3 02 00 cc cc cc cc cc cc cc cc 90 90 90 90 90 90 90 90 90
RSP: 0018:ffffc90000197e20 EFLAGS: 000002c6
RAX: 000000000019f2e7 RBX: ffffffff8197149e RCX: 0000000080000001
RDX: 0000000000000001 RSI: ffffffff8d793c31 RDI: ffffffff8bc086e0
RBP: ffffc90000197f10 R08: ffff8880b87336db R09: 1ffff110170e66db
R10: dffffc0000000000 R11: ffffed10170e66dc R12: ffffffff8f822d70
R13: 1ffff11003956b70 R14: 0000000000000001 R15: 0000000000000001
 arch_safe_halt arch/x86/include/asm/paravirt.h:107 [inline]
 default_idle+0x13/0x20 arch/x86/kernel/process.c:767
 default_idle_call+0x73/0xb0 kernel/sched/idle.c:122
 cpuidle_idle_call kernel/sched/idle.c:191 [inline]
 do_idle+0x1be/0x4d0 kernel/sched/idle.c:332
 cpu_startup_entry+0x44/0x60 kernel/sched/idle.c:430
 start_secondary+0x101/0x110 arch/x86/kernel/smpboot.c:312
 common_startup_64+0x13e/0x147
 </TASK>
sched: DL replenish lagged too much