rcu: INFO: rcu_preempt self-detected stall on CPU
rcu: 	0-....: (1 GPs behind) idle=776c/1/0x4000000000000000 softirq=61335/61336 fqs=5224
rcu: 	         hardirqs   softirqs   csw/system
rcu: 	 number:     7995          0            0
rcu: 	cputime:      171      52318            4   ==> 52490(ms)
rcu: 	(t=10500 jiffies g=45025 q=10530 ncpus=2)
CPU: 0 UID: 0 PID: 12551 Comm: modprobe 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+0x159/0x980 net/sched/sch_taprio.c:726
Code: 18 4c 89 f8 48 c1 e8 03 42 80 3c 20 00 74 08 4c 89 ff e8 da c3 b6 f8 4d 8b 3f 49 83 c7 38 4c 89 f8 48 c1 e8 03 42 80 3c 20 00 <48> 8b 6c 24 28 74 08 4c 89 ff e8 b8 c3 b6 f8 4d 8b 1f 48 89 df 2e
RSP: 0018:ffffc90000007c70 EFLAGS: 00000246
RAX: 1ffffffff1f05547 RBX: ffff888031db4000 RCX: 0000000000000100
RDX: ffff8880345d1e80 RSI: 0000000000000000 RDI: 0000000000000000
RBP: 0000000000000002 R08: ffffffff896fa756 R09: ffffffff8df41aa0
R10: 0000000000000001 R11: ffffffff8962eaf0 R12: dffffc0000000000
R13: ffff888033ac8000 R14: ffff888031db4000 R15: ffffffff8f82aa38
FS:  0000000000000000(0000) GS:ffff888125e1f000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f8aafb60f98 CR3: 00000000340be000 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+0x717/0x900 net/core/dev.c:5783
 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:lock_is_held_type+0x107/0x150 kernel/locking/lockdep.c:5945
Code: 18 00 00 b8 ff ff ff ff 65 0f c1 05 93 c1 26 07 83 f8 01 75 25 9c 58 a9 00 02 00 00 75 39 41 f7 c4 00 02 00 00 74 01 fb 89 d8 <5b> 41 5c 41 5d 41 5e 41 5f 5d e9 9a db 02 00 cc 90 0f 0b 90 48 c7
RSP: 0018:ffffc900040af268 EFLAGS: 00000206
RAX: 0000000000000001 RBX: 0000000000000001 RCX: 0000000000000046
RDX: 0000000000000000 RSI: ffffffff8d975f6e RDI: ffffffff8bc083e0
RBP: 00000000ffffffff R08: ffff8880345d1e80 R09: 0000000000000003
R10: 0000000000000003 R11: 0000000000000000 R12: 0000000000000246
R13: ffff8880345d1e80 R14: ffff8880311bccc0 R15: 0000000000000000
 lock_is_held include/linux/lockdep.h:249 [inline]
 mt_locked lib/maple_tree.c:-1 [inline]
 mt_slot lib/maple_tree.c:736 [inline]
 mas_slot lib/maple_tree.c:769 [inline]
 mt_validate_nulls lib/maple_tree.c:7124 [inline]
 mt_validate+0x3e08/0x4390 lib/maple_tree.c:7179
 validate_mm+0xae/0x4a0 mm/vma.c:644
 vms_complete_munmap_vmas+0x6aa/0x8a0 mm/vma.c:1299
 __mmap_complete+0x7b/0x610 mm/vma.c:2540
 __mmap_region mm/vma.c:2717 [inline]
 mmap_region+0x11e3/0x1d10 mm/vma.c:2786
 do_mmap+0xc45/0x10d0 mm/mmap.c:558
 vm_mmap_pgoff+0x2a6/0x4d0 mm/util.c:581
 ksys_mmap_pgoff+0x51f/0x760 mm/mmap.c:604
 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: 0033:0x7f3717761242
Code: 08 00 04 00 00 eb e2 90 41 f7 c1 ff 0f 00 00 75 27 55 89 cd 53 48 89 fb 48 85 ff 74 33 41 89 ea 48 89 df b8 09 00 00 00 0f 05 <48> 3d 00 f0 ff ff 77 5e 5b 5d c3 0f 1f 00 c7 05 46 40 01 00 16 00
RSP: 002b:00007ffc213504c8 EFLAGS: 00000206 ORIG_RAX: 0000000000000009
RAX: ffffffffffffffda RBX: 00007f3717466000 RCX: 00007f3717761242
RDX: 0000000000000003 RSI: 0000000000002000 RDI: 00007f3717466000
RBP: 0000000000000812 R08: 0000000000000000 R09: 000000000002c000
R10: 0000000000000812 R11: 0000000000000206 R12: 00007ffc21350588
R13: 00007f3717736ab0 R14: 00007ffc21350940 R15: 00000fff8426a09c
 </TASK>
sched: DL replenish lagged too much