kern/158707: kernel trap 12 with interrupts disabled

[Vadim]

>Number:         158707
>Category:       kern
>Synopsis:       kernel trap 12 with interrupts disabled
>Confidential:   no
>Severity:       critical
>Priority:       high
>Responsible:    freebsd-bugs
>State:          open
>Quarter:        
>Keywords:       
>Date-Required:
>Class:          sw-bug
>Submitter-Id:   current-users
>Arrival-Date:   Thu Jul 07 17:50:08 UTC 2011
>Closed-Date:
>Last-Modified:
>Originator:     Vadim
>Release:        8.2
>Organization:
webnewteam
>Environment:
FreeBSD host21-web.mastak.net 8.2-RELEASE-p2 FreeBSD 8.2-RELEASE-p2 #0: Tue Jun 28 19:48:46 UTC 2011     root at host21-web.mastak.net:/usr/obj/usr/src/sys/mastak  amd64
>Description:
host27-web# ifconfig em0 down
kernel trap 12 with interrupts disabled


Fatal trap 12: page fault while in kernel mode
cpuid = 2; apic id = 02
fault virtual address   = 0x20
fault code              = supervisor read data, page not present
instruction pointer     = 0x20:0xffffffff80606468
stack pointer           = 0x28:0xffffff80b9dbc770
frame pointer           = 0x28:0xffffff80b9dbc7a0
code segment            = base 0x0, limit 0xfffff, type 0x1b
                        = DPL 0, pres 1, long 1, def32 0, gran 1
processor eflags        = resume, IOPL = 0
current process         = 91735 (ifconfig)
trap number             = 12
panic: page fault
cpuid = 2
U^[[Aptime: 1d17h38m43s
Cannot dump. Device not defined or unavailable.

Network inerfase dev.em.0.%desc: Intel(R) PRO/1000 Network Connection 7.1.9
and
igb net inerfase
When in a large number of network connections server soedideny give kernel panic


>How-To-Repeat:

>Fix:


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