Unix (3.2v4.2) and ODT FAQ
This article is from a FAQ concerning SCO operating
systems. While some of the information may be applicable to any OS,
or any Unix or Linux OS, it may be specific to SCO Xenix, Open
There is lots of Linux, Mac OS X and general Unix info elsewhere on
this site: Search this site is the best
way to find anything.
This is an ancient post with no relevance to modern systems.
NOTE: This problem appeared at some point in 3.2v4.x, and
is fixed in OpenServer 5. See the documentation in TA 482366 for more
This is due to executing an invalid instruction in kernel mode
(trap 6 is for an invalid instruction; a user process which does
this will simply die with a core dump). If your particular problem
is a double panic and it doesn't leave a system memory dump in
whatever device you've chosen for dumps (usually /dev/swap),
apply the following patch.
This is due to a problem in the kernel's querytlb() routine,
which may allow the Pentium to execute a 386-specific instruction
which is not supported on the Pentium. The cure involves patching a
kernel module using _fst.
(see part 1 on where to find /etc/_fst). Go into the
/etc/conf/pack.d/kernel directory. We're going to work on
locore.o, so make a backup and then run _fst -w
locore.o - The conversation between you and _fst goes like
this (the * is a prompt from _fst; don't type it or any of _fst's
* querytlb+5?w 0x9090
querytlb: call near 0x17:0x0
querytlb+0x7 sub eax, eax
This fixes one of the modules which is linked into the kernel,
so you only have to apply it once. Relink and reboot.
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