A.P. Lawrence

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 Desktop or Openserver.

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.

Unix (3.2v4.2) and ODT FAQ

How do I fix a kernel trap 0x00000006?

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 detail.

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 responses):

* querytlb+5?w 0x9090
querytlb+ox5:     0x375=0x9090
* querytlb,4?ai
querytlb:          call  near 0x17:0x0
querytlb+0x5:      nop
querytlb+0x6:      nop
querytlb+0x7       sub     eax, eax
* $q

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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