> I just installed OpenSolaris 2008.05, which runs just
> fine, but as soon as I upgrade to b99 from b86,
> everything goes haywire. My machine will randomly
> reboot or hang while doing normal operations like
> browsing the web, etc. 

Are there kernel crash dumps written to /var/crash/`hostname` ?

If yes, can you try to get a panic stack backtrace from 
the kernel crash dump:

    # cd /var/crash/`hostname`
    # ls -la
    # mdb -k 0             (where "0" is sequence number of the crash, from the 
previous listing)
    $C

    the output of the mdb "::msgbuf" command could be interesting, too.

> Has anyone encountered this before, and if so, what
> should I do to resolve this issue?

What kind of hardware are you using?
cpu? mainboard? chipset? hdd?  etc..

Just a wild guess: b99 contains a nasty memory corruption
bug in the nv_sata driver (which is fixed in b101) ...
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