rcu: INFO: rcu_preempt self-detected stall on CPU
rcu: 	1-....: (1 GPs behind) idle=e544/1/0x4000000000000000 softirq=445612/445636 fqs=5249
rcu: 	         hardirqs   softirqs   csw/system
rcu: 	 number:     8087          0            0
rcu: 	cputime:      295      52183           43   ==> 52500(ms)
rcu: 	(t=10502 jiffies g=369745 q=11535 ncpus=2)
CPU: 1 UID: 0 PID: 27754 Comm: syz.1.14347 Not tainted syzkaller #0 PREEMPT(full) 
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/25/2025
RIP: 0010:qdisc_dev include/net/sch_generic.h:594 [inline]
RIP: 0010:taprio_dequeue_from_txq+0x64/0x980 net/sched/sch_taprio.c:711
Code: 74 08 4c 89 ef e8 dc 9f b6 f8 4c 8d a3 80 02 00 00 4d 8b 6d 00 4c 89 e8 48 c1 e8 03 48 b9 00 00 00 00 00 fc ff df 80 3c 08 00 <74> 08 4c 89 ef e8 b2 9f b6 f8 4d 8b 6d 00 4c 89 e0 48 c1 e8 03 48
RSP: 0018:ffffc90000a08c70 EFLAGS: 00000246
RAX: 1ffff1100cdbc800 RBX: ffff88807e371000 RCX: dffffc0000000000
RDX: 0000000000000100 RSI: 000000000000000b RDI: ffff88807e371000
RBP: 1ffff1100fc6e26a R08: ffffffff896fcc56 R09: ffffffff8df41aa0
R10: 0000000000000001 R11: ffffffff89631050 R12: ffff88807e371280
R13: ffff888066de4000 R14: ffff8880513e8800 R15: 000000000000000b
FS:  00007f514823c6c0(0000) GS:ffff888125f1f000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 000000110c2993e0 CR3: 0000000042bf0000 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:unwind_next_frame+0x18de/0x23d0 arch/x86/kernel/unwind_orc.c:-1
Code: 85 43 0a 00 00 49 0f bf 04 24 48 01 c6 4c 89 f7 48 89 da e8 84 0d 00 00 84 c0 0f 84 47 01 00 00 48 bd 00 00 00 00 00 fc ff df <48> 8b 44 24 20 0f b6 04 28 84 c0 0f 85 17 08 00 00 b3 01 8b 84 24
RSP: 0018:ffffc9000d19f318 EFLAGS: 00000202
RAX: 1ffff92001a33e01 RBX: ffffffff901a68b6 RCX: 0000000000000001
RDX: ffffc9000d19f428 RSI: dffffc0000000000 RDI: ffffc9000d19f520
RBP: dffffc0000000000 R08: ffffc9000d19f520 R09: 0000000000000000
R10: ffffc9000d19f438 R11: fffff52001a33e89 R12: ffffc9000d19f438
R13: 1ffff92001a33e7f R14: ffffc9000d19f3e8 R15: 1ffffffff2034d17
 arch_stack_walk+0x11c/0x150 arch/x86/kernel/stacktrace.c:25
 stack_trace_save+0x9c/0xe0 kernel/stacktrace.c:122
 kasan_save_stack mm/kasan/common.c:57 [inline]
 kasan_save_track+0x3e/0x80 mm/kasan/common.c:78
 poison_kmalloc_redzone mm/kasan/common.c:398 [inline]
 __kasan_kmalloc+0x93/0xb0 mm/kasan/common.c:415
 kasan_kmalloc include/linux/kasan.h:263 [inline]
 __kmalloc_cache_noprof+0x3e2/0x700 mm/slub.c:5776
 kmalloc_noprof include/linux/slab.h:957 [inline]
 kzalloc_noprof include/linux/slab.h:1094 [inline]
 ref_tracker_alloc+0x133/0x460 lib/ref_tracker.c:271
 __netns_tracker_alloc include/net/net_namespace.h:362 [inline]
 sk_alloc+0x2c3/0x390 net/core/sock.c:2322
 __netlink_create+0x65/0x260 net/netlink/af_netlink.c:626
 __netlink_kernel_create+0x131/0x710 net/netlink/af_netlink.c:2018
 netlink_kernel_create include/linux/netlink.h:62 [inline]
 rtnetlink_net_init+0xa4/0x130 net/core/rtnetlink.c:7042
 ops_init+0x35c/0x5c0 net/core/net_namespace.c:137
 setup_net+0x110/0x330 net/core/net_namespace.c:446
 copy_net_ns+0x3e3/0x570 net/core/net_namespace.c:581
 create_new_namespaces+0x3e7/0x6a0 kernel/nsproxy.c:130
 unshare_nsproxy_namespaces+0x11c/0x170 kernel/nsproxy.c:226
 ksys_unshare+0x4c8/0x8c0 kernel/fork.c:3171
 __do_sys_unshare kernel/fork.c:3242 [inline]
 __se_sys_unshare kernel/fork.c:3240 [inline]
 __x64_sys_unshare+0x38/0x50 kernel/fork.c:3240
 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: 0033:0x7f514738f749
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:00007f514823c038 EFLAGS: 00000246 ORIG_RAX: 0000000000000110
RAX: ffffffffffffffda RBX: 00007f51475e6090 RCX: 00007f514738f749
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 000000006a040000
RBP: 00007f5147413f91 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007f51475e6128 R14: 00007f51475e6090 R15: 00007ffcabcfb978
 </TASK>
sched: DL replenish lagged too much