kern/175791: Fatal trap 12: page fault while in kernel mode at seemingly random times.

[Dimitri Semitsoglou-Tsiapos]

>Number:         175791
>Category:       kern
>Synopsis:       Fatal trap 12: page fault while in kernel mode at seemingly random times.
>Confidential:   no
>Severity:       non-critical
>Priority:       low
>Responsible:    freebsd-bugs
>State:          open
>Quarter:        
>Keywords:       
>Date-Required:
>Class:          sw-bug
>Submitter-Id:   current-users
>Arrival-Date:   Sun Feb 03 02:50:00 UTC 2013
>Closed-Date:
>Last-Modified:
>Originator:     Dimitri Semitsoglou-Tsiapos
>Release:        9.1-RELEASE
>Organization:
>Environment:
FreeBSD fbsd 9.1-RELEASE FreeBSD 9.1-RELEASE #0 r243825: Tue Dec  4 09:23:10 UTC 2012     root at farrell.cse.buffalo.edu:/usr/obj/usr/src/sys/GENERIC  amd64
>Description:
System seems to crash at random times, during casual desktop use.
During the last crash the system was very low on Free memory (around 100M according to `top`), while swap was not being used.

I'm not sure if the backtrace [1] contains the desired output (seems to start at /usr/src/sys/kern/kern_shutdown.c).
When running kgdb in /var/crash the output points to ULE instead [2].

[1] http://sprunge.us/CjHC
[2] http://sprunge.us/SMPa
>How-To-Repeat:

>Fix:


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