rcu: INFO: rcu_preempt self-detected stall on CPU
rcu: 	1-....: (1 GPs behind) idle=7acc/1/0x4000000000000000 softirq=32687/32688 fqs=5200
rcu: 	         hardirqs   softirqs   csw/system
rcu: 	 number:     6045          0            0
rcu: 	cputime:      259      52230            9   ==> 52490(ms)
rcu: 	(t=10500 jiffies g=28853 q=2897 ncpus=2)
CPU: 1 UID: 0 PID: 8959 Comm: syz.1.734 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:__sanitizer_cov_trace_pc+0x2f/0x70 kernel/kcov.c:217
Code: 8b 04 24 65 48 8b 0c 25 08 20 80 92 65 8b 15 58 28 bf 10 81 e2 00 01 ff 00 74 11 81 fa 00 01 00 00 75 35 83 b9 6c 16 00 00 00 <74> 2c 8b 91 48 16 00 00 83 fa 02 75 21 48 8b 91 50 16 00 00 48 8b
RSP: 0018:ffffc90000a08c58 EFLAGS: 00000246
RAX: ffffffff8963368d RBX: ffff88807f2b8800 RCX: ffff888027dd3d00
RDX: 0000000000000100 RSI: 0000000000000000 RDI: ffff88807f2b8800
RBP: ffff888056a2a000 R08: ffffffff89700d06 R09: ffffffff8df41aa0
R10: 0000000000000001 R11: ffffffff89633680 R12: dffffc0000000000
R13: ffff888034480000 R14: ffff88807f2b8800 R15: ffffffff8f82b538
FS:  00007ff21d7b56c0(0000) GS:ffff888125f1e000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00002000000000c0 CR3: 0000000024fb8000 CR4: 00000000003526f0
Call Trace:
 <IRQ>
 qdisc_peek_head+0xd/0x40 include/net/sch_generic.h:1180
 taprio_dequeue_from_txq+0x174/0x980 net/sched/sch_taprio.c:726
 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: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 ce 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:ffffc90002f67028 EFLAGS: 00000246
RAX: 0000000000000046 RBX: ffff8880793d2268 RCX: 0000000000000046
RDX: ffffffff95885158 RSI: ffffffff8d7a7c62 RDI: ffffffff8bc08360
RBP: ffff888027dd3d00 R08: ffffffff81ab3a98 R09: ffffffff8df41aa0
R10: dffffc0000000000 R11: ffffffff89633ea0 R12: 0000000000000000
R13: ffff8880793d2269 R14: 0000000000001000 R15: 0000000000000a87
 __qdisc_destroy+0x166/0x400 net/sched/sch_generic.c:1079
 taprio_destroy+0x263/0x550 net/sched/sch_taprio.c:2043
 __qdisc_destroy+0x153/0x400 net/sched/sch_generic.c:1077
 taprio_attach+0x25a/0x380 net/sched/sch_taprio.c:2161
 qdisc_graft+0x1175/0x1590 net/sched/sch_api.c:1162
 __tc_modify_qdisc net/sched/sch_api.c:1761 [inline]
 tc_modify_qdisc+0x16d3/0x2020 net/sched/sch_api.c:1817
 rtnetlink_rcv_msg+0x77c/0xb70 net/core/rtnetlink.c:6967
 netlink_rcv_skb+0x208/0x470 net/netlink/af_netlink.c:2550
 netlink_unicast_kernel net/netlink/af_netlink.c:1318 [inline]
 netlink_unicast+0x82f/0x9e0 net/netlink/af_netlink.c:1344
 netlink_sendmsg+0x805/0xb30 net/netlink/af_netlink.c:1894
 sock_sendmsg_nosec net/socket.c:727 [inline]
 __sock_sendmsg+0x21c/0x270 net/socket.c:742
 ____sys_sendmsg+0x505/0x820 net/socket.c:2592
 ___sys_sendmsg+0x21f/0x2a0 net/socket.c:2646
 __sys_sendmsg net/socket.c:2678 [inline]
 __do_sys_sendmsg net/socket.c:2683 [inline]
 __se_sys_sendmsg net/socket.c:2681 [inline]
 __x64_sys_sendmsg+0x19b/0x260 net/socket.c:2681
 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
 do_syscall_64+0xec/0xf80 arch/x86/entry/syscall_64.c:94
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7ff21c98f749
Code: ff ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 40 00 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 c7 c1 a8 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007ff21d7b5038 EFLAGS: 00000246 ORIG_RAX: 000000000000002e
RAX: ffffffffffffffda RBX: 00007ff21cbe6090 RCX: 00007ff21c98f749
RDX: 0000000000000000 RSI: 00002000000007c0 RDI: 000000000000000a
RBP: 00007ff21ca13f91 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007ff21cbe6128 R14: 00007ff21cbe6090 R15: 00007ffcf8fca7f8
 </TASK>
sched: DL replenish lagged too much