Help on deciphering crash

[System Mangler]

In article <3645 at sdcrdcf.UUCP> davem at sdcrdcf.UUCP (David Melman) writes:
> Our Vax 750 running 4.2BSD has occassionally been crashing with:
> machine check 2: cp tbuf par fault
>	va 80039728 errpc 8000394e mdr a smr 8 rdtimo 0 tbgpar 0 cacherr 5
>	busserr 6 mcesr 9 pc 8000394e ps1 40c0008 mcsr 80016

In article <4891 at mimsy.UUCP>, chris at mimsy.UUCP (Chris Torek) writes:
> There are two interrelated fixes for this.  Both are already in
> 4.3BSD.  The first is that some tbuf parity errors can be corrected [...]

Read the registers.  This is a cache parity error, not a tbuf parity
error.	Never mind that 4.[23] doesn't distinguish between the two.

We get these all the time.  There are two ways to "fix" it:  swap
L0003 boards until you get a good one ($$$), or change the machine
check handler to flush the cache and return.  Now, can anyone tell
me how to flush the cache?

Don Speck   speck at vlsi.caltech.edu  {seismo,rutgers,ames}!cit-vax!speck