rcu: INFO: rcu_preempt self-detected stall on CPU
rcu: 	1-....: (1 GPs behind) idle=93e4/1/0x4000000000000000 softirq=45531/45539 fqs=5250
rcu: 	         hardirqs   softirqs   csw/system
rcu: 	 number:     7703          0            0
rcu: 	cputime:      118      52381            4   ==> 52520(ms)
rcu: 	(t=10503 jiffies g=37301 q=2178 ncpus=2)
CPU: 1 UID: 0 PID: 9250 Comm: kworker/u8:24 Not tainted syzkaller #0 PREEMPT(full) 
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/25/2025
Workqueue: netns cleanup_net
RIP: 0010:taprio_next_tc_txq net/sched/sch_taprio.c:765 [inline]
RIP: 0010:taprio_dequeue_tc_priority+0x1bb/0x750 net/sched/sch_taprio.c:796
Code: a6 02 00 00 41 8b 75 00 48 8b 7c 24 48 48 8b 54 24 50 8b 4c 24 1c e8 b4 05 00 00 48 89 44 24 10 48 8b 44 24 58 42 0f b6 04 20 <84> c0 0f 85 96 02 00 00 48 8b 44 24 20 44 0f b7 30 48 8b 44 24 70
RSP: 0018:ffffc90000a08cd8 EFLAGS: 00000286
RAX: 0000000000000000 RBX: 0000000000000000 RCX: ffff8880342c5b80
RDX: 0000000000000100 RSI: 0000000000000000 RDI: ffff888053af8000
RBP: 1ffff11003e5d46a R08: ffffffff896fa756 R09: ffffffff8df41aa0
R10: 0000000000000001 R11: ffffffff8962eaf0 R12: dffffc0000000000
R13: ffff88801f2ea354 R14: 0000000000000010 R15: 0000000000000002
FS:  0000000000000000(0000) GS:ffff888125f1f000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007ff9c5519000 CR3: 00000000917f2000 CR4: 00000000003526f0
Call Trace:
 <IRQ>
 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:arch_atomic_read arch/x86/include/asm/atomic.h:23 [inline]
RIP: 0010:raw_atomic_read include/linux/atomic/atomic-arch-fallback.h:457 [inline]
RIP: 0010:atomic_read include/linux/atomic/atomic-instrumented.h:33 [inline]
RIP: 0010:__kernfs_active fs/kernfs/dir.c:34 [inline]
RIP: 0010:kernfs_active fs/kernfs/dir.c:40 [inline]
RIP: 0010:kernfs_drain+0x17d/0x5e0 fs/kernfs/dir.c:496
Code: ff eb 05 e8 65 48 5d ff 4c 89 74 24 10 4d 8d 7e 04 4c 89 ff be 04 00 00 00 e8 ef 6a c3 ff 4d 89 fe 49 c1 ee 03 41 0f b6 04 1e <84> c0 0f 85 71 03 00 00 45 8b 27 bf ff ff ff ff 44 89 e6 e8 6b 4c
RSP: 0018:ffffc9000488f5a0 EFLAGS: 00000a03
RAX: 0000000000000000 RBX: dffffc0000000000 RCX: ffffffff8263af71
RDX: 0000000000000000 RSI: 0000000000000004 RDI: ffff8880771a3a54
RBP: ffffc9000488f6a8 R08: ffff8880771a3a57 R09: 1ffff1100ee3474a
R10: dffffc0000000000 R11: ffffed100ee3474b R12: 1ffffffff1f04a54
R13: ffff8880771a3a50 R14: 1ffff1100ee3474a R15: ffff8880771a3a54
 __kernfs_remove+0x3bc/0x650 fs/kernfs/dir.c:1513
 kernfs_remove_by_name_ns+0xaf/0x130 fs/kernfs/dir.c:1722
 kernfs_remove_by_name include/linux/kernfs.h:633 [inline]
 remove_files fs/sysfs/group.c:28 [inline]
 sysfs_remove_group+0xfc/0x2f0 fs/sysfs/group.c:328
 sysfs_remove_groups+0x54/0xb0 fs/sysfs/group.c:352
 destroy_gid_attrs drivers/infiniband/core/sysfs.c:1182 [inline]
 ib_free_port_attrs+0xc5/0x3b0 drivers/infiniband/core/sysfs.c:1407
 remove_one_compat_dev drivers/infiniband/core/device.c:1038 [inline]
 rdma_dev_exit_net+0x1d8/0x340 drivers/infiniband/core/device.c:1176
 ops_exit_list net/core/net_namespace.c:199 [inline]
 ops_undo_list+0x49a/0x990 net/core/net_namespace.c:252
 cleanup_net+0x4d8/0x7a0 net/core/net_namespace.c:696
 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