kern/100802: panic in ddb mode if sending signal '0'

Valerio Daelli valerio.daelli at
Tue Jul 25 08:20:18 UTC 2006

>Number:         100802
>Category:       kern
>Synopsis:       panic in ddb mode if sending signal '0'
>Confidential:   no
>Severity:       serious
>Priority:       medium
>Responsible:    freebsd-bugs
>State:          open
>Class:          sw-bug
>Submitter-Id:   current-users
>Arrival-Date:   Tue Jul 25 08:20:16 GMT 2006
>Originator:     Valerio Daelli
>Release:        5.4
FreeBSD 5.4-RELEASE-p12 FreeBSD 5.4-RELEASE-p12 #1: Thu Mar  2 14:16:41 CET 2006     root at  alpha
If you break in ddb mode by pressing CTRL-ALT-ESC and send any process
a signal '0', then kernel panics.
Break in ddb mode (CTRL-ALT-ESC), type ps, get a pid and type

kill 0 <PID>
Correct line number 561 in /usr/src/sys/ddb/db_command.c:


         if (sig < 0 || sig > _SIG_MAXSIG)


       if (sig < 1 || sig > _SIG_MAXSIG)

and recompile the kernel.


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