rcu: INFO: rcu_preempt self-detected stall on CPU
rcu: 	1-....: (1 GPs behind) idle=8024/1/0x4000000000000000 softirq=84061/84062 fqs=5158
rcu: 	         hardirqs   softirqs   csw/system
rcu: 	 number:     9230          0            0
rcu: 	cputime:      279      52200           26   ==> 52480(ms)
rcu: 	(t=10500 jiffies g=57069 q=2163 ncpus=2)
CPU: 1 UID: 0 PID: 5835 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:check_kcov_mode kernel/kcov.c:183 [inline]
RIP: 0010:__sanitizer_cov_trace_pc+0x28/0x70 kernel/kcov.c:217
Code: 90 90 f3 0f 1e fa 48 8b 04 24 65 48 8b 0c 25 08 40 80 92 65 8b 15 68 47 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
RSP: 0018:ffffc90000a08c58 EFLAGS: 00000246
RAX: ffffffff8963521d RBX: ffff888048d40800 RCX: ffff88802dadbd00
RDX: 0000000000000100 RSI: 0000000000000000 RDI: ffff888048d40800
RBP: ffff888033eea000 R08: ffffffff89702936 R09: ffffffff8df41aa0
R10: 0000000000000001 R11: ffffffff89635210 R12: dffffc0000000000
R13: ffff88803436c000 R14: ffff888048d40800 R15: ffffffff8f82c038
FS:  000055556bc26500(0000) GS:ffff888125f1c000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f46093dfd58 CR3: 000000007a988000 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: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:__page_table_check_ptes_set+0x7/0x330 mm/page_table_check.c:201
Code: 5b 41 5e 5d c3 cc cc cc cc cc 66 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 55 41 57 <41> 56 41 55 41 54 53 48 83 ec 18 89 cd 49 89 d5 49 89 f6 49 89 ff
RSP: 0018:ffffc9000414f3c8 EFLAGS: 00000293
RAX: ffffffff820eedff RBX: 800000005a84c007 RCX: 0000000000000001
RDX: 800000005a84c007 RSI: ffff888056c88228 RDI: ffff88807d468000
RBP: ffffc9000414f670 R08: ffffea00016a1307 R09: 1ffffd40002d4260
R10: dffffc0000000000 R11: fffff940002d4261 R12: dffffc0000000000
R13: ffff88805d7f7228 R14: ffff88807d468000 R15: ffff888056c88228
 page_table_check_ptes_set include/linux/page_table_check.h:76 [inline]
 set_ptes include/linux/pgtable.h:292 [inline]
 __copy_present_ptes mm/memory.c:1102 [inline]
 copy_present_ptes mm/memory.c:1181 [inline]
 copy_pte_range mm/memory.c:1304 [inline]
 copy_pmd_range+0x4d02/0x7e00 mm/memory.c:1392
 copy_pud_range mm/memory.c:1429 [inline]
 copy_p4d_range mm/memory.c:1453 [inline]
 copy_page_range+0xb88/0x11d0 mm/memory.c:1535
 dup_mmap+0xf4a/0x1b80 mm/mmap.c:1827
 dup_mm kernel/fork.c:1529 [inline]
 copy_mm+0x13c/0x4b0 kernel/fork.c:1581
 copy_process+0x165d/0x3950 kernel/fork.c:2221
 kernel_clone+0x21e/0x820 kernel/fork.c:2651
 __do_sys_clone kernel/fork.c:2792 [inline]
 __se_sys_clone kernel/fork.c:2776 [inline]
 __x64_sys_clone+0x18b/0x1e0 kernel/fork.c:2776
 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: 0033:0x7f635dd85e93
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:00007ffc89ff9bc8 EFLAGS: 00000246 ORIG_RAX: 0000000000000038
RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 00007f635dd85e93
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000001200011
RBP: 0000000000000001 R08: 0000000000000000 R09: 0000000000000001
R10: 000055556bc267d0 R11: 0000000000000246 R12: 0000000000000000
R13: 00000000000927c0 R14: 000000000005b041 R15: 00007ffc89ff9d60
 </TASK>
sched: DL replenish lagged too much