From mboxrd@z Thu Jan  1 00:00:00 1970
Date: Tue, 15 Feb 2011 18:14:02 -0800
From: Anthony Martin <ality@pbrane.org>
To: Fans of the OS Plan 9 from Bell Labs <9fans@9fans.net>
Message-ID: <20110216021402.GA24848@dinah>
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Subject: Re: [9fans] 9vx on OpenBSD
Topicbox-Message-UUID: af4490a6-ead6-11e9-9d60-3106f5b1d025

> % ktrace -d ./9vx -r /n/plan9 -u glenda -g -S
>         namec #/
>         namec #e/terminal
>         namec #e/cputype
>         namec #e/rootdir
>         namec #e/service
>         namec #e/user
>         namec #e/sysname
>         namec #Zplan9/
>         namec /
>         namec #p
>         namec /proc
>         namec #~/mntloop
>         namec #Zplan9/
>         namec #s/boot
> 9vx panic: vxproc_run: Invalid argument

In src/libvx32/openbsd.c:/vxemu_map
	int s, sel;
	struct vxproc *vxp;
	union descriptor desc;

	...
		/*if(emu->datasel == 0){
			if ((s = i386_set_ldt(LDT_AUTO_ALLOC, &desc, 1)) < 0)
				return -1; */
		emu->datasel = (s<<3) + 4 + 3;  // 4=LDT, 3=RPL
		if(i386_set_ldt(emu->datasel >> 3, &desc, 1) < 0)
			return -1;
	...

The s variable is used un-initialized because
of the commented piece of code, causing EINVAL.
And since LDT_AUTO_ALLOC is only on FreeBSD or
Darwin, you're going to have to get it another
way.

At least, that's what I think from reading the
code since I don't have access to an OpenBSD box.

  Anthony