i386/109267: FreeBSD 6.2 Stable Kernel Update Prevents Dell PowerEdge 1750 (SMP) From Booting

[Sean Benoit]

>Number:         109267
>Category:       i386
>Synopsis:       FreeBSD 6.2 Stable Kernel Update Prevents Dell PowerEdge 1750 (SMP) From Booting
>Confidential:   no
>Severity:       critical
>Priority:       high
>Responsible:    freebsd-i386
>State:          open
>Quarter:        
>Keywords:       
>Date-Required:
>Class:          sw-bug
>Submitter-Id:   current-users
>Arrival-Date:   Sun Feb 18 07:40:04 GMT 2007
>Closed-Date:
>Last-Modified:
>Originator:     Sean Benoit
>Release:        6.2 Stable
>Organization:
Digital Jungle Systems Inc.
>Environment:
FreeBSD mail-server.digital-jungle.com 6.2-STABLE FreeBSD 6.2-STABLE #0: Sat Feb 17 01:33:38 UTC 2007     tarzan at mail-server.digital-jungle.com:/usr/obj/usr/src/sys/MAIL-SERVER  i386
>Description:
As stated in the one line summary. We tried to update the FreeBSD kernel from 6.2 Pre-Release to 6.2 Release (Stable) and our Dell PowerEdge 1750 multi-processor machines freeze on while detecting the second processor.

In order to get the machines to boot, the second processor must be disabled in the BIOS.

We had EXACTLY the same problem a few months ago when we updated to 6.2 Pre-Release. It was reported here and you kindly provided a patch extremely quickly. However, the same bug seems to have made its way into the current release.
>How-To-Repeat:
Simply update to the 6.2 Release (Stable) kernel on a Dell PowerEdge 1750 with SMP enabled and watch it freeze on boot while detecting the second processor.
>Fix:
Disable the second processor in the Dell BIOS.
>Release-Note:
>Audit-Trail:
>Unformatted: