rcu: INFO: rcu_preempt self-detected stall on CPU
rcu: 	0-....: (10500 ticks this GP) idle=54b4/1/0x4000000000000000 softirq=118857/118857 fqs=5247
rcu: 	         hardirqs   softirqs   csw/system
rcu: 	 number:     8450          0            0
rcu: 	cputime:      201      52288           10   ==> 52500(ms)
rcu: 	(t=10502 jiffies g=92005 q=2849 ncpus=2)
CPU: 0 UID: 0 PID: 18104 Comm: syz.6.3101 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 e0 6e 92 65 8b 15 58 dc ae 10 81 e2 00 01 ff 00 74 11 81 fa 00 01 00 00 75 35 83 b9 7c 16 00 00 00 <74> 2c 8b 91 58 16 00 00 83 fa 02 75 21 48 8b 91 60 16 00 00 48 8b
RSP: 0018:ffffc90000007ac0 EFLAGS: 00000246
RAX: ffffffff89538e9d RBX: ffff88807a380000 RCX: ffff888060510000
RDX: 0000000000000100 RSI: 0000000000000000 RDI: ffff88807a380000
RBP: ffff8880567ed000 R08: 0000000000000000 R09: ffffffff89605286
R10: 0000000000000001 R11: ffffffff89538e90 R12: dffffc0000000000
R13: ffff88807f778000 R14: ffff88807a380000 R15: ffffffff8f7d9b78
FS:  00007ff13d3f66c0(0000) GS:ffff888126132000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f964ff750e0 CR3: 0000000061996000 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/0x1540 net/sched/sch_generic.c:420
 qdisc_run+0xc7/0x300 include/net/pkt_sched.h:120
 net_tx_action+0x7c9/0xa10 net/core/dev.c:5781
 handle_softirqs+0x286/0x870 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:1052 [inline]
 sysvec_apic_timer_interrupt+0xa6/0xc0 arch/x86/kernel/apic/apic.c:1052
 </IRQ>
 <TASK>
 asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:697
RIP: 0010:unwind_next_frame+0x1721/0x2390 arch/x86/kernel/unwind_orc.c:648
Code: 18 02 00 00 80 3d 7e 7e 01 11 00 0f 85 0b 02 00 00 c6 05 71 7e 01 11 01 4c 89 f7 e8 89 0c 00 00 e9 f7 01 00 00 48 8b 54 24 08 <48> 8d 5a 02 48 83 c2 03 48 89 d8 48 c1 e8 03 0f b6 04 28 84 c0 0f
RSP: 0018:ffffc90004abecd8 EFLAGS: 00000246
RAX: 0000000000000000 RBX: ffffc90004abee40 RCX: 0000000000000000
RDX: ffffffff900af50a RSI: 0000000000000001 RDI: ffffc90004abee68
RBP: dffffc0000000000 R08: ffffc90004abee67 R09: 0000000000000000
R10: ffffc90004abee58 R11: fffff52000957dcd R12: ffffc90004abee08
R13: ffffc90004abee58 R14: ffffc90004abee08 R15: 1ffffffff2015ea1
 __unwind_start+0x5b9/0x760 arch/x86/kernel/unwind_orc.c:758
 unwind_start arch/x86/include/asm/unwind.h:64 [inline]
 arch_stack_walk+0xe4/0x150 arch/x86/kernel/stacktrace.c:24
 stack_trace_save+0x9c/0xe0 kernel/stacktrace.c:122
 save_stack+0xf5/0x1f0 mm/page_owner.c:156
 __set_page_owner+0x8d/0x4c0 mm/page_owner.c:332
 set_page_owner include/linux/page_owner.h:32 [inline]
 post_alloc_hook+0x234/0x290 mm/page_alloc.c:1845
 prep_new_page mm/page_alloc.c:1853 [inline]
 get_page_from_freelist+0x2365/0x2440 mm/page_alloc.c:3879
 __alloc_frozen_pages_noprof+0x181/0x370 mm/page_alloc.c:5178
 alloc_pages_mpol+0x232/0x4a0 mm/mempolicy.c:2416
 folio_alloc_mpol_noprof+0x39/0x70 mm/mempolicy.c:2435
 shmem_alloc_folio mm/shmem.c:1870 [inline]
 shmem_alloc_and_add_folio+0x423/0xf40 mm/shmem.c:1912
 shmem_get_folio_gfp+0x59d/0x1660 mm/shmem.c:2535
 shmem_fault+0x179/0x390 mm/shmem.c:2736
 __do_fault+0x138/0x390 mm/memory.c:5281
 do_read_fault mm/memory.c:5716 [inline]
 do_fault mm/memory.c:5850 [inline]
 do_pte_missing mm/memory.c:4362 [inline]
 handle_pte_fault mm/memory.c:6195 [inline]
 __handle_mm_fault+0x35e3/0x5400 mm/memory.c:6336
 handle_mm_fault+0x40a/0x8e0 mm/memory.c:6505
 faultin_page mm/gup.c:1126 [inline]
 __get_user_pages+0x165c/0x2a00 mm/gup.c:1428
 populate_vma_page_range+0x29f/0x3a0 mm/gup.c:1860
 __mm_populate+0x24c/0x380 mm/gup.c:1963
 mm_populate include/linux/mm.h:3478 [inline]
 vm_mmap_pgoff+0x387/0x4d0 mm/util.c:586
 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
 do_syscall_64+0xfa/0xfa0 arch/x86/entry/syscall_64.c:94
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7ff13f18f749
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:00007ff13d3f6038 EFLAGS: 00000246 ORIG_RAX: 0000000000000009
RAX: ffffffffffffffda RBX: 00007ff13f3e6180 RCX: 00007ff13f18f749
RDX: 0000000000000003 RSI: 0000000000b36000 RDI: 0000200000000000
RBP: 00007ff13f213f91 R08: ffffffffffffffff R09: 0000000000000000
R10: 0000000000008031 R11: 0000000000000246 R12: 0000000000000000
R13: 00007ff13f3e6218 R14: 00007ff13f3e6180 R15: 00007ffd87583cd8
 </TASK>
sched: DL replenish lagged too much