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Subject: kern/166920: dtrace(1) kills itself with SIGUSR1
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>Number:         166920
>Category:       kern
>Synopsis:       dtrace(1) kills itself with SIGUSR1
>Confidential:   no
>Severity:       serious
>Priority:       low
>Responsible:    freebsd-bugs
>State:          open
>Quarter:        
>Keywords:       
>Date-Required:
>Class:          sw-bug
>Submitter-Id:   current-users
>Arrival-Date:   Fri Apr 13 21:40:05 UTC 2012
>Closed-Date:
>Last-Modified:
>Originator:     Ryan Stone
>Release:        8-STABLE
>Organization:
>Environment:
>Description:
(module-1:wheel)# dtrace -n 'database$pid:::' -c ./db
ld-elf.so.1: invalid probe specifier database$pid:::: failed to grab process 28055
User defined signal 1: 30

dtrace(1) sends itself SIGUSR1 (30) from one thread to another if it hits an error.  It would seem that in certain cases it sends that signal when there is no handler installed for it.
>How-To-Repeat:

>Fix:


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