kern/55038: compat_netbsd32 module gives SIGSEGV when executing a.out image

[paul%whooppee.com@localhost]

	Note: There was a bad value `' for the field `Class'.
	It was set to the default value of `sw-bug'.

>Number:         55038
>Category:       kern
>Synopsis:       compat_netbsd32 module gives SIGSEGV when executing a.out image
>Confidential:   no
>Severity:       serious
>Priority:       medium
>Responsible:    kern-bug-people
>State:          open
>Class:          sw-bug
>Submitter-Id:   net
>Arrival-Date:   Sun Mar 01 16:45:00 +0000 2020
>Originator:     Paul Goyette
>Release:        NetBSD 9.99.46
>Organization:
+--------------------+--------------------------+-----------------------+
| Paul Goyette       | PGP Key fingerprint:     | E-mail addresses:     |
| (Retired)          | FA29 0E3B 35AF E8AE 6651 | paul%whooppee.com@localhost     |
| Software Developer | 0786 F758 55DE 53BA 7731 | pgoyette%netbsd.org@localhost   |
+--------------------+--------------------------+-----------------------+
>Environment:
	
	
System: NetBSD speedy.whooppee.com 9.99.46 NetBSD 9.99.46 (SPEEDY 2020-02-07 16:26:35 UTC) #1: Fri Feb 7 19:37:58 UTC 2020 paul%speedy.whooppee.com@localhost:/build/netbsd-local/obj/amd64/sys/arch/amd64/compile/SPEEDY amd64
Architecture: x86_64
Machine: amd64
>Description:
	When trying to execute a NetBSD-i386 0.9 a.out image, it gets
	a SIGSEGV.

	Note that due to PR kern/55037 you need to use a non-built-in
	compat_netbsd32 module to reproduce.
	
>How-To-Repeat:
	Build a NOCOMPAT amd64 kernel from current sources, install,
	modload compat_netbsd32 module, and try to run an old 0.9
	a.out image from NetBSD-i386 
	
>Fix:
	

>Unformatted: