rcu: INFO: rcu_preempt self-detected stall on CPU
rcu: 	1-....: (1 GPs behind) idle=6194/1/0x4000000000000000 softirq=33501/33502 fqs=5017
rcu: 	         hardirqs   softirqs   csw/system
rcu: 	 number:        0          0            0
rcu: 	cputime:      199      52279           14   ==> 52480(ms)
rcu: 	(t=10500 jiffies g=27217 q=2100 ncpus=2)
CPU: 1 UID: 0 PID: 8966 Comm: syz.4.769 Not tainted 6.15.0-rc1-syzkaller-00141-gcfe82469a00f #0 PREEMPT(full) 
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 02/12/2025
RIP: 0010:get_current arch/x86/include/asm/current.h:25 [inline]
RIP: 0010:write_comp_data kernel/kcov.c:245 [inline]
RIP: 0010:__sanitizer_cov_trace_cmp4+0x8/0x90 kernel/kcov.c:288
Code: 44 0a 20 c3 cc cc cc cc 66 2e 0f 1f 84 00 00 00 00 00 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 f3 0f 1e fa 4c 8b 04 24 <65> 48 8b 14 25 08 a0 68 93 65 8b 05 e8 38 a5 11 25 00 01 ff 00 74
RSP: 0018:ffffc90000a08b00 EFLAGS: 00000202
RAX: 0000000000000000 RBX: 0000000000000005 RCX: ffff888030503c00
RDX: 0000000000000100 RSI: 000000000000000d RDI: 0000000000000007
RBP: 0000000000000007 R08: ffffffff8a26dc8a R09: 0000000000000000
R10: 0000000000000000 R11: ffffffff8a18a740 R12: dffffc0000000000
R13: ffff88807e152390 R14: 000000000000000d R15: 1ffff1100fc2a472
FS:  0000000000000000(0000) GS:ffff888125096000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007fabfe01ad58 CR3: 00000000605c2000 CR4: 00000000003526f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 <IRQ>
 taprio_next_tc_txq net/sched/sch_taprio.c:763 [inline]
 taprio_dequeue_tc_priority+0x21a/0x7a0 net/sched/sch_taprio.c:790
 taprio_dequeue+0x186/0x550 net/sched/sch_taprio.c:-1
 dequeue_skb net/sched/sch_generic.c:293 [inline]
 qdisc_restart net/sched/sch_generic.c:398 [inline]
 __qdisc_run+0x272/0x2180 net/sched/sch_generic.c:416
 qdisc_run+0xda/0x270 include/net/pkt_sched.h:127
 net_tx_action+0x898/0xa50 net/core/dev.c:5532
 handle_softirqs+0x2d6/0x9b0 kernel/softirq.c:579
 __do_softirq kernel/softirq.c:613 [inline]
 invoke_softirq kernel/softirq.c:453 [inline]
 __irq_exit_rcu+0xfb/0x220 kernel/softirq.c:680
 irq_exit_rcu+0x9/0x30 kernel/softirq.c:696
 instr_sysvec_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1049 [inline]
 sysvec_apic_timer_interrupt+0xa6/0xc0 arch/x86/kernel/apic/apic.c:1049
 </IRQ>
 <TASK>
 asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:702
RIP: 0010:rcu_preempt_read_enter kernel/rcu/tree_plugin.h:391 [inline]
RIP: 0010:__rcu_read_lock+0x30/0xb0 kernel/rcu/tree_plugin.h:414
Code: 57 41 56 53 49 be 00 00 00 00 00 fc ff df 65 4c 8b 3c 25 08 a0 68 93 49 81 c7 44 04 00 00 4c 89 fb 48 c1 eb 03 42 0f b6 04 33 <84> c0 75 35 41 8b 2f ff c5 42 0f b6 04 33 84 c0 75 3e 41 89 2f 42
RSP: 0018:ffffc900048d71a0 EFLAGS: 00000a03
RAX: 0000000000000000 RBX: 1ffff110060a0808 RCX: ffff888030503c00
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000000
RBP: 0000000000000000 R08: ffffffff8239600c R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000000 R12: 1ffff1100a7caf96
R13: ffffea0001b11f40 R14: dffffc0000000000 R15: ffff888030504044
 rcu_read_lock include/linux/rcupdate.h:839 [inline]
 page_table_check_clear+0x161/0x6f0 mm/page_table_check.c:77
 ptep_get_and_clear_full arch/x86/include/asm/jump_label.h:-1 [inline]
 get_and_clear_full_ptes include/linux/pgtable.h:714 [inline]
 zap_present_folio_ptes mm/memory.c:1501 [inline]
 zap_present_ptes mm/memory.c:1586 [inline]
 do_zap_pte_range mm/memory.c:1687 [inline]
 zap_pte_range mm/memory.c:1731 [inline]
 zap_pmd_range mm/memory.c:1823 [inline]
 zap_pud_range mm/memory.c:1852 [inline]
 zap_p4d_range mm/memory.c:1873 [inline]
 unmap_page_range+0x33cf/0x44d0 mm/memory.c:1894
 unmap_vmas+0x3ce/0x5f0 mm/memory.c:1984
 exit_mmap+0x2bc/0xde0 mm/mmap.c:1284
 __mmput+0x115/0x420 kernel/fork.c:1379
 exit_mm+0x221/0x310 kernel/exit.c:589
 do_exit+0x994/0x27f0 kernel/exit.c:940
 do_group_exit+0x207/0x2c0 kernel/exit.c:1102
 get_signal+0x1696/0x1730 kernel/signal.c:3034
 arch_do_signal_or_restart+0x98/0x840 arch/x86/kernel/signal.c:337
 exit_to_user_mode_loop kernel/entry/common.c:111 [inline]
 exit_to_user_mode_prepare include/linux/entry-common.h:329 [inline]
 __syscall_exit_to_user_mode_work kernel/entry/common.c:207 [inline]
 syscall_exit_to_user_mode+0xce/0x340 kernel/entry/common.c:218
 do_syscall_64+0x100/0x230 arch/x86/entry/syscall_64.c:100
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f23fe58d169
Code: Unable to access opcode bytes at 0x7f23fe58d13f.
RSP: 002b:00007f23ff4c10e8 EFLAGS: 00000246 ORIG_RAX: 00000000000000ca
RAX: fffffffffffffe00 RBX: 00007f23fe7a5fa8 RCX: 00007f23fe58d169
RDX: 0000000000000000 RSI: 0000000000000080 RDI: 00007f23fe7a5fa8
RBP: 00007f23fe7a5fa0 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 00007f23fe7a5fac
R13: 0000000000000000 R14: 00007ffd7cdc45d0 R15: 00007ffd7cdc46b8
 </TASK>
sched: DL replenish lagged too much