rcu: INFO: rcu_preempt self-detected stall on CPU
rcu: 	1-....: (1 GPs behind) idle=79bc/1/0x4000000000000000 softirq=51408/51409 fqs=5237
rcu: 	         hardirqs   softirqs   csw/system
rcu: 	 number:     6032          0            0
rcu: 	cputime:      150      52328            4   ==> 52480(ms)
rcu: 	(t=10500 jiffies g=46341 q=2804 ncpus=2)
CPU: 1 UID: 0 PID: 5829 Comm: syz-executor 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+0xa/0x980 net/sched/sch_taprio.c:709
Code: 24 10 eb ba e8 a7 47 5f f8 48 8b 5c 24 10 eb ae 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 55 41 57 41 56 41 55 41 54 53 <48> 83 ec 30 89 4c 24 10 49 89 d6 41 89 f7 48 89 fb 49 bc 00 00 00
RSP: 0018:ffffc90000a08b08 EFLAGS: 00000246
RAX: 0000000000000000 RBX: 0000000000000000 RCX: 0000000000000002
RDX: ffff8880292ea400 RSI: 0000000000000008 RDI: ffff88807b5e8000
RBP: 1ffff1100f6bd06a R08: ffffffff89615756 R09: ffffffff8df41cc0
R10: 0000000000000001 R11: ffffffff89549fc0 R12: dffffc0000000000
R13: ffff88807b5e8354 R14: 0000000000000010 R15: 0000000000000002
FS:  0000555585d51500(0000) GS:ffff8881261b1000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f04a85156c0 CR3: 000000005f0b4000 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+0x7ac/0x9f0 net/core/dev.c:5781
 handle_softirqs+0x27d/0x850 kernel/softirq.c:622
 __do_softirq kernel/softirq.c:656 [inline]
 invoke_softirq kernel/softirq.c:496 [inline]
 __irq_exit_rcu+0xca/0x1f0 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_count arch/x86/include/asm/preempt.h:27 [inline]
RIP: 0010:check_kcov_mode kernel/kcov.c:183 [inline]
RIP: 0010:__sanitizer_cov_trace_pc+0x11/0x70 kernel/kcov.c:217
Code: 5b e9 13 d2 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 f0 76 92 <65> 8b 15 b8 a5 b5 10 81 e2 00 01 ff 00 74 11 81 fa 00 01 00 00 75
RSP: 0018:ffffc9000408f3b8 EFLAGS: 00000293
RAX: ffffffff820f1875 RBX: 0000000000000001 RCX: ffff88802a211e80
RDX: ffff88802a211e80 RSI: 0000000000000008 RDI: 000000000000001f
RBP: ffffc9000408f650 R08: ffff88801c88470f R09: 1ffff110039108e1
R10: dffffc0000000000 R11: ffffed10039108e2 R12: dffffc0000000000
R13: 0000000000000008 R14: ffff888048ce9768 R15: 00007f04a66ed000
 copy_pte_range mm/memory.c:1267 [inline]
 copy_pmd_range+0x745/0x7f00 mm/memory.c:1390
 copy_pud_range mm/memory.c:1427 [inline]
 copy_p4d_range mm/memory.c:1451 [inline]
 copy_page_range+0xc14/0x1270 mm/memory.c:1539
 dup_mmap+0xf4c/0x1b10 mm/mmap.c:1834
 dup_mm kernel/fork.c:1486 [inline]
 copy_mm+0x13c/0x4b0 kernel/fork.c:1538
 copy_process+0x165d/0x3950 kernel/fork.c:2178
 kernel_clone+0x21e/0x820 kernel/fork.c:2608
 __do_sys_clone kernel/fork.c:2749 [inline]
 __se_sys_clone kernel/fork.c:2733 [inline]
 __x64_sys_clone+0x18b/0x1e0 kernel/fork.c:2733
 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
 do_syscall_64+0xfa/0xf80 arch/x86/entry/syscall_64.c:94
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f04a7785e93
Code: 1f 84 00 00 00 00 00 64 48 8b 04 25 10 00 00 00 45 31 c0 31 d2 31 f6 bf 11 00 20 01 4c 8d 90 d0 02 00 00 b8 38 00 00 00 0f 05 <48> 3d 00 f0 ff ff 77 35 89 c2 85 c0 75 2c 64 48 8b 04 25 10 00 00
RSP: 002b:00007fff84056908 EFLAGS: 00000246 ORIG_RAX: 0000000000000038
RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 00007f04a7785e93
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000001200011
RBP: 0000000000000001 R08: 0000000000000000 R09: 0000000000000001
R10: 0000555585d517d0 R11: 0000000000000246 R12: 0000000000000000
R13: 00000000000927c0 R14: 000000000005fead R15: 00007fff84056aa0
 </TASK>
sched: DL replenish lagged too much