rcu: INFO: rcu_preempt self-detected stall on CPU
rcu: 	1-....: (10500 ticks this GP) idle=cfdc/1/0x4000000000000000 softirq=49448/49448 fqs=5250
rcu: 	         hardirqs   softirqs   csw/system
rcu: 	 number:     7454          0            0
rcu: 	cputime:      219      52280           27   ==> 52530(ms)
rcu: 	(t=10504 jiffies g=43041 q=1027 ncpus=2)
CPU: 1 UID: 0 PID: 6867 Comm: kworker/1:17 Not tainted syzkaller #0 PREEMPT(full) 
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/25/2025
Workqueue: events iterate_cleanup_work
RIP: 0010:taprio_dequeue_from_txq+0x752/0x980 net/sched/sch_taprio.c:761
Code: 8f 4c 89 fe e8 6f 37 56 fb e9 61 ff ff ff e8 05 38 50 f8 e9 4e fb ff ff e8 fb 37 50 f8 45 31 f6 4c 89 f0 48 83 c4 30 5b 41 5c <41> 5d 41 5e 41 5f 5d e9 42 20 ec 01 cc 31 ff 44 89 ee e8 17 3c 50
RSP: 0018:ffffc90000a08cb0 EFLAGS: 00000286
RAX: 0000000000000000 RBX: 0000000000000000 RCX: ffff88807e153d00
RDX: 0000000000000100 RSI: 0000000000000000 RDI: ffff888027856000
RBP: ffff888026989000 R08: ffffffff89700d06 R09: ffffffff8df41aa0
R10: 0000000000000001 R11: ffffffff89633680 R12: dffffc0000000000
R13: ffff888077cfc000 R14: 0000000000000000 R15: ffffffff8f82b538
FS:  0000000000000000(0000) GS:ffff888125f1e000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000200000744030 CR3: 000000002fe58000 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:get_next_corpse net/netfilter/nf_conntrack_core.c:2317 [inline]
RIP: 0010:nf_ct_iterate_cleanup+0x4cb/0x520 net/netfilter/nf_conntrack_core.c:2371
Code: 40 b5 75 8c be 2f 09 00 00 31 d2 e8 8f 29 0f f8 2e 2e 2e 31 c0 4c 8b 24 24 41 ff c4 44 3b 25 80 d0 ff 05 73 18 e8 a5 f3 3d f8 <e9> d0 fb ff ff e8 9b f3 3d f8 eb df e8 94 f3 3d f8 eb a7 e8 8d f3
RSP: 0018:ffffc9001ba67930 EFLAGS: 00000293
RAX: ffffffff8983041b RBX: ffffc9001ba679e0 RCX: ffff88807e153d00
RDX: 0000000000000000 RSI: 0000000000000001 RDI: 0000000000000000
RBP: 0000000000000001 R08: ffffffff8f822d77 R09: 1ffffffff1f045ae
R10: dffffc0000000000 R11: fffffbfff1f045af R12: 000000000001138e
R13: ffff888023689c68 R14: dffffc0000000000 R15: 1ffff9200374cf3c
 iterate_cleanup_work+0xda/0x190 net/netfilter/nf_nat_masquerade.c:87
 process_one_work kernel/workqueue.c:3257 [inline]
 process_scheduled_works+0xad1/0x1770 kernel/workqueue.c:3340
 worker_thread+0x8a0/0xda0 kernel/workqueue.c:3421
 kthread+0x711/0x8a0 kernel/kthread.c:463
 ret_from_fork+0x510/0xa50 arch/x86/kernel/process.c:158
 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:246
 </TASK>
sched: DL replenish lagged too much