kern/94278: Crash with FIFOs and ktrace

[Martin]

>Number:         94278
>Category:       kern
>Synopsis:       Crash with FIFOs and ktrace
>Confidential:   no
>Severity:       serious
>Priority:       medium
>Responsible:    freebsd-bugs
>State:          open
>Quarter:        
>Keywords:       
>Date-Required:
>Class:          sw-bug
>Submitter-Id:   current-users
>Arrival-Date:   Thu Mar 09 16:10:03 GMT 2006
>Closed-Date:
>Last-Modified:
>Originator:     Martin
>Release:        6.1-PRERELEASE
>Organization:
>Environment:
FreeBSD klotz.local 6.1-PRERELEASE FreeBSD 6.1-PRERELEASE #0: Mon Mar  6 00:21:54 CET 2006     root at klotz.local:/usr/obj/usr/src/sys/KLOTZ  i386
>Description:
In the German Forum BSDForen.de (link: http://www.bsdforen.de/showthread.php?p=115505#post115505)
a poster named tib has found a situation where produces a very nice crash.

The crash is reproducible on 6.0R upto 6.1-PRERELEASE and confirmed by other posters. It involves reading from a FIFO by using ktrace and kdump. You can reproduce it with user privileges.


>How-To-Repeat:
mkfifo ktest
ktrace -f ktest -a date
kdump -f ktest

>Fix:

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