kern/166923: dtrace: kernel trap 12 with interrupts disabled (not a panic!?)

[Ryan Stone]

>Number:         166923
>Category:       kern
>Synopsis:       dtrace: kernel trap 12 with interrupts disabled (not a panic!?)
>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:   Fri Apr 13 21:40:06 UTC 2012
>Closed-Date:
>Last-Modified:
>Originator:     Ryan Stone
>Release:        8-STABLE
>Organization:
>Environment:
>Description:
I activated the following probes in a proprietary userland application:

 dtrace -p 45412 -n 'pid$target:foo::entry { ustack();}'


The following got spammed to the console:

kernel trap 12 with interrupts disabled
kernel trap 12 with interrupts disabled
kernel trap 12 with interrupts disabled
kernel trap 12 with interrupts disabled
kernel trap 12 with interrupts disabled
kernel trap 12 with interrupts disabled
kernel trap 12 with interrupts disabled
kernel trap 12 with interrupts disabled
kernel trap 12 with interrupts disabled
kernel trap 12 with interrupts disabled
kernel trap 12 with interrupts disabled
kernel trap 12 with interrupts disabled

Incredibly, the kernel did not panic.  When I stopped dtrace the messages stopped and everything continued normally...

>How-To-Repeat:

>Fix:


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