arm/180820: FreeBSD v10.0 kernal panic on Raspberry Pi + Fix

[Samuel Seay]

>Number:         180820
>Category:       arm
>Synopsis:       FreeBSD v10.0 kernal panic on Raspberry Pi + Fix
>Confidential:   no
>Severity:       non-critical
>Priority:       low
>Responsible:    freebsd-arm
>State:          open
>Quarter:        
>Keywords:       
>Date-Required:
>Class:          sw-bug
>Submitter-Id:   current-users
>Arrival-Date:   Thu Jul 25 01:10:00 UTC 2013
>Closed-Date:
>Last-Modified:
>Originator:     Samuel Seay
>Release:        10.0-CURRENT r253520M
>Organization:
>Environment:
no environment due to kernel panic
>Description:
Per the thread at http://lists.freebsd.org/pipermail/svn-src-head/2013-July/049735.html, I encountered the same issue when building a raspberry pi with the script at http://kernelnomicon.org/?p=275. After applying the patch I am able to fully boot the latest FreeBSD on my Raspberry Pi.

I do not see this patch in the latest tree nor do I see a bug report about the issue so I am filing this to bring attention to it and get the bug corrected, hopefully in the near future.
>How-To-Repeat:
Download the latest svn base head and compile the kernel for arm based on the script at http://kernelnomicon.org/?p=275. Attempt to boot the image on a raspberry pi after writing it to a sdcard.
>Fix:
Index: sys/vm/vm_map.c
===================================================================
--- sys/vm/vm_map.c     (revision 253514)
+++ sys/vm/vm_map.c     (working copy)
@@ -239,8 +239,7 @@
        vm_map_t map;
 
        map = (vm_map_t)mem;
-       map->nentries = 0;
-       map->size = 0;
+       memset(map, 0, sizeof(*map));
        mtx_init(&map->system_mtx, "vm map (system)", NULL, MTX_DEF | 
MTX_DUPOK);
        sx_init(&map->lock, "vm map (user)");
        return (0);

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