[FS#3496] tc -s qdisc crashes when a RED queue is in use:

[OpenWrt Bugs]

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A new Flyspray task has been opened.  Details are below. 

User who did this - Daniel Lakeland (dlakelan) 

Attached to Project - OpenWrt/LEDE Project
Summary - tc -s qdisc crashes when a RED queue is in use:
Task Type - Bug Report
Category - Base system
Status - Unconfirmed
Assigned To - 
Operating System - All
Severity - Medium
Priority - Very Low
Reported Version - Trunk
Due in Version - Undecided
Due Date - Undecided
Details - Supply the following if possible:
 - Device problem occurs on
all
 - Software versions of OpenWrt/LEDE release, packages, etc.

current trunk and 19.x.x series

 - Steps to reproduce
   
attach red qdisc to an interface, then run `tc -s qdisc` and see segfault

```
ip link add type veth
tc qdisc add dev veth0 root red limit 150000  min 5000 max 10000 avpkt 500 bandwidth 1000kbit probability 1.0
tc -s qdisc
qdisc noqueue 0: dev lo root refcnt 2 
 Sent 0 bytes 0 pkt (dropped 0, overlimits 0 requeues 0) 
 backlog 0b 0p requeues 0
qdisc fq_codel 0: dev eth0 root refcnt 2 limit 10240p flows 1024 quantum 1514 target 5.0ms interval 100.0ms memory_limit 4Mb ecn 
 Sent 4673809 bytes 6135 pkt (dropped 0, overlimits 0 requeues 0) 
 backlog 0b 0p requeues 0
  maxpacket 1414 drop_overlimit 0 new_flow_count 16 ecn_mark 0
  new_flows_len 0 old_flows_len 0
qdisc noqueue 0: dev br-lan root refcnt 2 
 Sent 0 bytes 0 pkt (dropped 0, overlimits 0 requeues 0) 
 backlog 0b 0p requeues 0
qdisc hfsc 1: dev eth0.1 root refcnt 2 default 3 
 Sent 762564 bytes 569 pkt (dropped 1, overlimits 7 requeues 0) 
 backlog 0b 0p requeues 0
Segmentation fault
root at OpenWrt:~#
```



More information can be found at the following URL:
https://bugs.openwrt.org/index.php?do=details&task_id=3496

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