kern/37875: ahcisata(4) triggers a panic with QUEUEDEBUG

[juan%xtrarom.org@localhost]

>Number:         37875
>Category:       kern
>Synopsis:       ahcisata(4) triggers a panic with QUEUEDEBUG
>Confidential:   no
>Severity:       serious
>Priority:       high
>Responsible:    kern-bug-people
>State:          open
>Class:          sw-bug
>Submitter-Id:   net
>Arrival-Date:   Fri Jan 25 22:20:00 +0000 2008
>Originator:     juan%xtrarom.org@localhost
>Release:        NetBSD 4.99.50
>Organization:
Juan Romero Pardines             The NetBSD Project
http://plog.xtrarom.org/         NetBSD/pkgsrc news in Spanish
http://mklivecd.xtrarom.org/     Make your own NetBSD Live CD/DVD!
>Environment:
System: NetBSD sasha 4.99.50 NetBSD 4.99.50 (Nocturno-nodbg) #229: Fri Jan 25 
22:38:40 CET 2008 
juan@sasha:/home/juan/build/i386/obj/sys/arch/i386/compile/Nocturno-nodbg i386
Architecture: i386
Machine: i386
>Description:
        While debugging another unrelated problem, I've found that my
        system fails before that the point I wanted to check. Looks like
        that ahcisata1 is the culprit and triggers the TAILQ_INSERT_TAIL
        check with QUEUDEBUG.

        dmesg available at: http://www.xtrarom.org/~juan/dmesg-sasha.txt

>How-To-Repeat:
        Boot a kernel with QUEUEDEBUG and an AHCI controller
>Fix:
        Yes, please.