kern/57400: Fatal kernel mode data abort 'translation fault' at wsevent_ibject_0x7c

[dave_daniels%argonet.co.uk@localhost]

>Number:         57400
>Category:       kern
>Synopsis:       Fatal kernel mode data abort 'translation fault' at wsevent_ibject_0x7c
>Confidential:   no
>Severity:       serious
>Priority:       medium
>Responsible:    kern-bug-people
>State:          open
>Class:          sw-bug
>Submitter-Id:   net
>Arrival-Date:   Wed May 10 11:00:00 +0000 2023
>Originator:     Dave Daniels
>Release:        9.3
>Organization:
>Environment:
NetBSD bluebox.nowhere.com  9.3 NetBSD 9.3 (GENERIC) #0: Thu Aug 4 15:30:37 UTC 2022 mkrepro%mkrepro.NetBSD.org@localhost: /usr/src/sys/arch/evbarm/compile/GENERIC evbarm
>Description:
After exiting from ctwm I have had several immediate kernel panics. The messages are the same each time:

uvm_fault(ox809baa20, 0, 2) -> e
Fatal kernel mode data abort: 'Translation Fault (S)'
trapframe: 0xb955fa60
FSR=00000805 FAR=00001560 spsr=20070013
r0=00000002, R1=00000000, r2 =00001560, r3 =00001560
r4 =90b5e450, r5 =b955fab0, r6 =b955faf8, r7=00000018
R9 =800d47bc, r9=90de0000, r10=00000000, r11=b955fadc
r12=b955faf8, ssp=b955fab0, slr=00001568, pc=802b4268
Stopped in pid 0.5 (system) at netnsd:wsevent_inject+0x7c: str R0,[r1,r3]

This causes the machine to lock up completely and the only option is to switch it off and on again.

The fault is intermittent but common, that is, it happens a lot but not every time. I am doing nothing more than starting an extra 'uxterm' or 'xterm' session in ctwm before quitting from ctwm.


 

The machine is a Raspberry Pi 2. I have only just installed NetBSD and have not added any other applications yet so it is running 'as supplied'. 

>How-To-Repeat:
Exit from ctwm using the 'quit' option on the 'NetBSD' menu.

 
>Fix: