rcu: INFO: rcu_preempt self-detected stall on CPU
rcu: 	0-....: (1 GPs behind) idle=3b54/1/0x4000000000000000 softirq=42168/42170 fqs=5236
rcu: 	         hardirqs   softirqs   csw/system
rcu: 	 number:     8089          0            0
rcu: 	cputime:      161      52327            4   ==> 52490(ms)
rcu: 	(t=10500 jiffies g=32761 q=2669 ncpus=2)
CPU: 0 UID: 0 PID: 10568 Comm: syz.0.1210 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+0x12c/0x980 net/sched/sch_taprio.c:726
Code: 04 20 84 c0 0f 85 bb 06 00 00 41 8b 1f 89 de 83 e6 01 31 ff e8 15 83 50 f8 83 e3 01 0f 85 62 01 00 00 48 89 6c 24 18 4c 89 f3 <4d> 8d 7e 18 4c 89 f8 48 c1 e8 03 42 80 3c 20 00 74 08 4c 89 ff e8
RSP: 0018:ffffc90000007c70 EFLAGS: 00000246
RAX: ffffffff897078eb RBX: ffff88805488f000 RCX: 0000000000000100
RDX: ffff88801c3a8000 RSI: 0000000000000000 RDI: 0000000000000000
RBP: 0000000000000002 R08: ffffffff896fcc56 R09: ffffffff8df41aa0
R10: 0000000000000001 R11: ffffffff89631050 R12: dffffc0000000000
R13: ffff888076488000 R14: ffff88805488f000 R15: ffff888034b1d290
FS:  00007f7214de06c0(0000) GS:ffff888125e1f000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000200000076000 CR3: 000000007b0ec000 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:5782
 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_acquire+0x222/0x340 kernel/locking/lockdep.c:5872
Code: ff ff ff e8 20 d1 bb 09 f7 44 24 08 00 02 00 00 0f 84 3a ff ff ff 65 48 8b 05 0a 20 e2 10 48 3b 44 24 58 75 33 fb 48 83 c4 60 <5b> 41 5c 41 5d 41 5e 41 5f 5d c3 cc cc cc cc cc 48 8d 3d 37 78 e7
RSP: 0018:ffffc9000b7f76b8 EFLAGS: 00000286
RAX: d12341f89f7d3200 RBX: 0000000000000000 RCX: 0000000080000001
RDX: 00000000cd7cb200 RSI: ffffffff8d976251 RDI: ffffffff8bc08360
RBP: ffffffff823a2e38 R08: ffffffff823a2e38 R09: ffff88802d3cd630
R10: dffffc0000000000 R11: fffffbfff1f0446f R12: 0000000000000000
R13: ffff88802d3cd630 R14: 0000000000000001 R15: 0000000000000246
 __raw_spin_lock include/linux/spinlock_api_smp.h:133 [inline]
 _raw_spin_lock+0x2e/0x40 kernel/locking/spinlock.c:154
 spin_lock include/linux/spinlock.h:351 [inline]
 inode_add_bytes+0x38/0x140 fs/stat.c:931
 __dquot_alloc_space+0x285/0xea0 fs/quota/dquot.c:1698
 dquot_alloc_space_nodirty include/linux/quotaops.h:299 [inline]
 dquot_alloc_block_nodirty include/linux/quotaops.h:326 [inline]
 shmem_inode_acct_blocks+0x1e7/0x460 mm/shmem.c:236
 shmem_alloc_and_add_folio+0x8a2/0xf40 mm/shmem.c:1962
 shmem_get_folio_gfp+0x59d/0x1660 mm/shmem.c:2556
 shmem_get_folio mm/shmem.c:2662 [inline]
 shmem_write_begin+0x16c/0x330 mm/shmem.c:3315
 generic_perform_write+0x2c5/0x900 mm/filemap.c:4314
 shmem_file_write_iter+0xf8/0x120 mm/shmem.c:3490
 new_sync_write fs/read_write.c:593 [inline]
 vfs_write+0x5c9/0xb30 fs/read_write.c:686
 ksys_write+0x145/0x250 fs/read_write.c:738
 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: 0033:0x7f7213f8f749
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:00007f7214de0038 EFLAGS: 00000246 ORIG_RAX: 0000000000000001
RAX: ffffffffffffffda RBX: 00007f72141e6090 RCX: 00007f7213f8f749
RDX: 00000000ffffff6a RSI: 0000200000000000 RDI: 000000000000000b
RBP: 00007f7214013f91 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007f72141e6128 R14: 00007f72141e6090 R15: 00007ffd806d6be8
 </TASK>
sched: DL replenish lagged too much