rcu: INFO: rcu_preempt self-detected stall on CPU
rcu: 	0-....: (10510 ticks this GP) idle=b58c/1/0x4000000000000000 softirq=72269/72270 fqs=5235
rcu: 	         hardirqs   softirqs   csw/system
rcu: 	 number:     7875          0            0
rcu: 	cputime:      144      52345            4   ==> 52520(ms)
rcu: 	(t=10504 jiffies g=54917 q=11528 ncpus=2)
CPU: 0 UID: 0 PID: 15132 Comm: syz.1.2312 Not tainted syzkaller #0 PREEMPT(full) 
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/25/2025
RIP: 0010:taprio_dequeue_from_txq+0x149/0x980 net/sched/sch_taprio.c:726
Code: 85 62 01 00 00 48 89 6c 24 18 4c 89 f3 4d 8d 7e 18 4c 89 f8 48 c1 e8 03 42 80 3c 20 00 74 08 4c 89 ff e8 aa 45 b6 f8 4d 8b 3f <49> 83 c7 38 4c 89 f8 48 c1 e8 03 42 80 3c 20 00 48 8b 6c 24 28 74
RSP: 0018:ffffc90000007c70 EFLAGS: 00000246
RAX: 1ffff110053afe03 RBX: ffff888029d7f000 RCX: 0000000000000100
RDX: ffff8880789d5b80 RSI: 0000000000000000 RDI: 0000000000000000
RBP: 0000000000000002 R08: ffffffff89702936 R09: ffffffff8df41aa0
R10: 0000000000000001 R11: ffffffff89635210 R12: dffffc0000000000
R13: ffff88805b014000 R14: ffff888029d7f000 R15: ffffffff8f82c000
FS:  00007fe2d40106c0(0000) GS:ffff888125e1c000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007efc132bc274 CR3: 000000002f584000 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:__sanitizer_cov_trace_pc+0x4a/0x70 kernel/kcov.c:223
Code: 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 32 48 8d 7e 01 <8b> 89 4c 16 00 00 48 39 cf 73 08 48 89 3a 48 89 44 f2 08 e9 0e 27
RSP: 0018:ffffc9001b1e6e78 EFLAGS: 00000246
RAX: ffffffff8934da6d RBX: dffffc0000000000 RCX: ffff8880789d5b80
RDX: ffffc90004811000 RSI: 0000000000001c0e RDI: 0000000000001c0f
RBP: ffffc9001b1e6f70 R08: 0000000000000003 R09: 0000000000000000
R10: ffffc9001b1e6ee0 R11: fffff5200363cdde R12: 1ffff9200363cdd8
R13: ffff888079b561b4 R14: 0000000000000000 R15: ffffc9001b1e6ee0
 gnet_stats_add_queue net/core/gen_stats.c:364 [inline]
 gnet_stats_copy_queue+0x2cd/0x760 net/core/gen_stats.c:393
 tc_fill_qdisc+0xc8b/0x1150 net/sched/sch_api.c:962
 qdisc_notify+0x28c/0x440 net/sched/sch_api.c:1039
 notify_and_destroy net/sched/sch_api.c:1059 [inline]
 qdisc_graft+0x1109/0x1590 net/sched/sch_api.c:1159
 __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: 0033:0x7fe2d318f749
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:00007fe2d4010038 EFLAGS: 00000246 ORIG_RAX: 000000000000002e
RAX: ffffffffffffffda RBX: 00007fe2d33e5fa0 RCX: 00007fe2d318f749
RDX: 0000000000000000 RSI: 00002000000007c0 RDI: 0000000000000004
RBP: 00007fe2d3213f91 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007fe2d33e6038 R14: 00007fe2d33e5fa0 R15: 00007ffffd86c238
 </TASK>
sched: DL replenish lagged too much