> netscape-2.0beta2[pid 212]: T_RWRET read_rw failed: pc=3a44fc npc=3a4500
> 	psr=90001081<EF,S>
> 

This points at a bogus stack pointer. In fact, ktraceing reveals that the
thing wants to mmap(2) a region of memory at 0x5000000, which is an illegal
address on small sparcs but which the VM system does nothing about (this
has come up before not too long ago).

It seems netscape sets up its thread stacks in that region and bombs
when trying to switch to one.

The following adb one-liner makes the Illegal instruction go away:

	sunos% adb netscape
	$W
	450628?We0000000
	^D
	sunos%

-pk