kern/153789: REGRESSION: FreeBSD 8.2-RC1 crashes under Solaris/Xen while FreeBSD 8.1-p2 does not.

[Andrew Kolchoogin]

>Number:         153789
>Category:       kern
>Synopsis:       REGRESSION: FreeBSD 8.2-RC1 crashes under Solaris/Xen while FreeBSD 8.1-p2 does not.
>Confidential:   no
>Severity:       critical
>Priority:       medium
>Responsible:    freebsd-bugs
>State:          open
>Quarter:        
>Keywords:       
>Date-Required:
>Class:          sw-bug
>Submitter-Id:   current-users
>Arrival-Date:   Sat Jan 08 12:50:09 UTC 2011
>Closed-Date:
>Last-Modified:
>Originator:     Andrew Kolchoogin
>Release:        FreeBSD 8.2-RC1
>Organization:
>Environment:
>Description:
After building FreeBSD 8.2-RC1/i386/Xen kernel and booting it under Solaris Express 2010.11/xVM it crashes immediately in pmap_init():

pmap_init(): address is out of range

As partition map initialisation is a very early part of kernel init, backtrace is useless -- it is empty.

It is a regression in comparision with FreeBSD v8.1 -- with the same Xen configuration FreeBSD v8.1 boots and runs adequately.

With decreasing of amount of memory available in virtual machine to value below 1G, kernel hungs in endless loop without any output to console -- only 'xm destroy' is able to destroy the domain in question.
>How-To-Repeat:

>Fix:


>Release-Note:
>Audit-Trail:
>Unformatted: