ERS5520 NVR Sw Exception: Task tCDTMain

[A-W]

Hi
I've several ERS5520 stacks and sometimes I get one of the switches restarted by itself. The status led is off on this unit too.
When I checked the logs, I found that it is usually combined with the following Exception:

C 3 2019-09-14 14:13:25 GMT+02:00 3 NVR Sw Exception: Task tCDTMain, Type Program, PC 0x019d24a8, SP 0x04f69e80

Last Saved Exception - Unit# 3
--------------------------------------

bld version: 6.3.6.17 time: (18/Feb/16 17:09:10) view: (productio)
Exception time: 14/SEP/19 14:13:25
sysUpTime: 183 days, 06:35:51
Registers:

R00 R01 R02 R03 R04 R05 R06 R07
019d24a8 04f69e80 00000000 04f69e88 00000001 02a2d3cc 00000858 04f69e88
R08 R09 R10 R11 R12 R13 R14 R15
00000000 00000000 00000007 00000000 00000000 00000000 00000000 00000000
R16 R17 R18 R19 R20 R21 R22 R23
00000000 00000000 00000000 00000007 019d2498 00000016 00000001 02a2d2a4
R24 R25 R26 R27 R28 R29 R30 R31
00000007 019d24a8 00000003 02a2d2ac 019ce37c 02a2d3cc 00000004 04f69f34

Exception type: Program
Task Name "tCDTMain"
KrnlSt 0, IntCnt 0, TskLckCnt 0, DAR 0x00000000, PC 0x019d24a8, SP 0x04f69e80
- Exception Stack Trace
+ PC 0x019d24a8
+ PC 0x019d24a8
= Total 196 Bytes =

Does anyone know what this problem is ? and how can I fix it?

[Birdy]

Hmm. Am seeing similar errors the last 2-3 weeks, but this specific error:

2020-02-21 20:04:00 GMT-0x:00 52 Sw Exception: Task tCDTMain, Type Data Access, PC 0x00fd3d10, SP 0x04ec4000

I just saw not more than 20 minutes ago.

This is for an ERS 5530-24THD switch that is S/A. The switch was running SW 6.3.5.025. Just upgraded to 6.3.6.017 earlier today, and the crashes are still occurring post-upgrade. These software exceptions seem to occur using switch operations such as working at the CLI, etc.

There is one fan that has Failed. I will hook up a PC to the console sport tomorrow and see what POST shows.

As there’s no more software support for this switch, there’s not much to do except perhaps shutdown un-needed services, etc to see if that corrects the problem. Hate to lose the use of these model switches - they still serve a purpose.