rcu: INFO: rcu_preempt self-detected stall on CPU
rcu: 	0-....: (1 GPs behind) idle=2ed4/1/0x4000000000000000 softirq=50319/50327 fqs=5245
rcu: 	         hardirqs   softirqs   csw/system
rcu: 	 number:     8044          0            0
rcu: 	cputime:      181      52318           13   ==> 52520(ms)
rcu: 	(t=10503 jiffies g=47033 q=2099 ncpus=2)
CPU: 0 UID: 0 PID: 13175 Comm: syz.2.1742 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 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 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:ffffc90000007b38 EFLAGS: 00000246
RAX: ffffffff8961fe40 RBX: 0000000000000000 RCX: ffff888025439e80
RDX: 0000000000000100 RSI: 0000000000000010 RDI: 0000000000000009
RBP: 1ffff1100ed7206a R08: ffffffff89615756 R09: ffffffff8df41cc0
R10: 0000000000000001 R11: ffffffff89549fc0 R12: dffffc0000000000
R13: ffff888076b90354 R14: 0000000000000010 R15: 0000000000000002
FS:  0000000000000000(0000) GS:ffff8881260b1000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007fe3671156c0 CR3: 000000000dd3a000 CR4: 00000000003526f0
Call Trace:
 <IRQ>
 taprio_dequeue_tc_priority+0x2d0/0x750 net/sched/sch_taprio.c:803
 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:lock_acquire+0x16c/0x340 kernel/locking/lockdep.c:5872
Code: 00 00 00 00 9c 8f 44 24 30 f7 44 24 30 00 02 00 00 0f 85 cd 00 00 00 f7 44 24 08 00 02 00 00 74 01 fb 65 48 8b 05 14 c5 d8 10 <48> 3b 44 24 58 0f 85 e5 00 00 00 48 83 c4 60 5b 41 5c 41 5d 41 5e
RSP: 0018:ffffc90002ee74f0 EFLAGS: 00000206
RAX: 4fdac2eaeff00e00 RBX: 0000000000000000 RCX: 4fdac2eaeff00e00
RDX: 000000003d98fb7b RSI: ffffffff8d952009 RDI: ffffffff8bbfc660
RBP: ffffffff82324194 R08: ffffffff82324194 R09: ffffffff8df41cc0
R10: dffffc0000000000 R11: fffff9400034f671 R12: 0000000000000002
R13: ffffffff8df41cc0 R14: 0000000000000000 R15: 0000000000000246
 rcu_lock_acquire include/linux/rcupdate.h:331 [inline]
 rcu_read_lock include/linux/rcupdate.h:867 [inline]
 page_table_check_clear+0x164/0x5f0 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:725 [inline]
 zap_present_folio_ptes mm/memory.c:1628 [inline]
 zap_present_ptes mm/memory.c:1710 [inline]
 do_zap_pte_range mm/memory.c:1811 [inline]
 zap_pte_range mm/memory.c:1855 [inline]
 zap_pmd_range mm/memory.c:1947 [inline]
 zap_pud_range mm/memory.c:1976 [inline]
 zap_p4d_range mm/memory.c:1997 [inline]
 unmap_page_range+0x344b/0x4370 mm/memory.c:2018
 unmap_single_vma mm/memory.c:2061 [inline]
 unmap_vmas+0x399/0x580 mm/memory.c:2105
 exit_mmap+0x23b/0xb20 mm/mmap.c:1280
 __mmput+0x118/0x430 kernel/fork.c:1130
 exit_mm+0x1da/0x2c0 kernel/exit.c:583
 do_exit+0x658/0x2310 kernel/exit.c:961
 do_group_exit+0x21c/0x2d0 kernel/exit.c:1114
 __do_sys_exit_group kernel/exit.c:1125 [inline]
 __se_sys_exit_group kernel/exit.c:1123 [inline]
 __x64_sys_exit_group+0x3f/0x40 kernel/exit.c:1123
 x64_sys_call+0x2210/0x2210 arch/x86/include/generated/asm/syscalls_64.h:232
 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: 0033:0x7f258e98f749
Code: Unable to access opcode bytes at 0x7f258e98f71f.
RSP: 002b:00007ffcafedcb68 EFLAGS: 00000246 ORIG_RAX: 00000000000000e7
RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 00007f258e98f749
RDX: 0000000000000064 RSI: 0000000000000000 RDI: 0000000000000000
RBP: 00007ffcafedcbcc R08: 0000001eafedcc5f R09: 00000000000927c0
R10: 0000000000000204 R11: 0000000000000246 R12: 0000000000000156
R13: 00000000000927c0 R14: 0000000000052d84 R15: 00007ffcafedcc20
 </TASK>
sched: DL replenish lagged too much