[FS#330] From Lede 2443 ownwards on WND3700v4 causes panic on BT Home Hub 5 on boot

[LEDE Bugs]

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

User who did this - Mauro Mozzarelli (ezplanet) 

Attached to Project - LEDE Project
Summary - From Lede 2443 ownwards on WND3700v4 causes panic on BT Home Hub 5 on boot
Task Type - Bug Report
Category - Kernel
Status - Unconfirmed
Assigned To - 
Operating System - All
Severity - Critical
Priority - Very Low
Reported Version - Trunk
Due in Version - Undecided
Due Date - Undecided
Details - Supply the following if possible:
 - Device problem occurs on Bt Home Hub 5 Type A (caused by WNDR3700v4)
 - Software versions of LEDE release from 2395 on BT Home Hub 5, from 2443 on WNDR3700v4
 - Steps to reproduce
   
Bt Home Hub 5 is connected to the internet via ADSL and acquires a subnet.
The 4 ports Switch is on the fixed public IP Internet subnet, 1 port connected to WNDR3700v4 WAN port and the others to servers on fixed public IP subnet.
The red Ethernet is not connected.
Masquerading is not configured, used as proper router.
WiFi Disabled

WNDR3700v4 WAN port connected to BT Home Hub 5 Switch and assigned 1 IP in the public subnet
WNDR3700v4 4 port switch connected to local switch and other devices on local private lan.
Configured for Masquerading from LAN and WiFi to WAN.

Bt Home Hub 5 panics at boot only if:
1) the 4 port switch is connected to the WNDR3700v4 WAN port
2) WNDR3700v4 runs LEDE > r2393. I have no releases between r2393 and r2443, thus it begins to happen if I upgrade WNDR3700v4 to 2443.

It is really peculiar because a firmware upgrade on one router, WNDR3700v4, causes a panic on a Home Hub 5 type!

If I downgrade WNDR3700v4 to r2393, I can reboot the Home Hub as many times as I want and there is no panic.

Attached is the boot console log from Home Hub 5


 

One or more files have been attached.

More information can be found at the following URL:
https://bugs.lede-project.org/index.php?do=details&task_id=330