I was running 7.0-BETA4 and had problems with SEG_FAULT 12 in g_up so I

rebuilt a stock GENERIC kernel with these additional options:
options     KDB
option      DDB
options     INVARIANTS
options     INVARIANT_SUPPORT
options     WITNESS
options     DEBUG_LOCKS
options     DEBUG_VFS_LOCKS
options     DIAGNOSTIC
Here is the build date:
FreeBSD charon.confluentasp.com 7.0-BETA4 FreeBSD 7.0-BETA4 #6: Tue Dec

11 09:05:50 EST 2007

mikej@charon.confluentasp.com:/usr/obj/usr/src/sys/CHARON  i386
(I cvsup'd source on this day just prior to kernel build - tag=RELENG_7)
Now when my SCSI array is plugged into the AHA-2944 controller the

kernel panics on boot.  If the array is not plugged
into the controller the system boots and runs fine.
I've read the handbook and tried to follow what posts I read as to what

would be of use in trouble shooting this.  
Please don't shoot the messenger. I'll be glad to supply and additional

information - this box is not in production 
so I'm willing to try anything.
Just to note, the controller and array had been in production under

6.2-RELEASE and prior versions and has been running 
for years without any problems.
Thanks.
--mikej
KDB: debugger backends: ddb
KDB: current backend: ddb
Copyright (c) 1992-2007 The FreeBSD Project.
Copyright (c) 1979, 1980, 1983, 1986, 1988, 1989, 1991, 1992, 1993, 1994
            The Regents of the University of California. All rights

reserved.
FreeBSD is a registered trademark of The FreeBSD Foundation.
FreeBSD 7.0-BETA4 #6: Tue Dec 11 09:05:50 EST 2007
    mikej@charon.confluentasp.com:/usr/obj/usr/src/sys/CHARON
WARNING: WITNESS option enabled, expect reduced performance.
WARNING: DIAGNOSTIC option enabled, expect reduced performance.
Timecounter "i8254" frequency 1193182 Hz quality 0
CPU: Mobile AMD Sempron(tm) Processor 3000+ (1799.81-MHz 686-class CPU)
  Origin = "AuthenticAMD"  Id = 0x20fc2  Stepping =...
[ message continues ]

This simple patch should fix it.  This code path is pretty rare, though,

I'm frankly shocked that you're running into it.
--- cam_xpt.c   20 Oct 2007 23:23:12 -0000      1.191

+++ cam_xpt.c   16 Dec 2007 07:46:22 -0000

@@ -3862,6 +3862,7 @@

                                                    &work_ccb->ccb_h,

                                                    xpt_links.stqe);
+                               mtx_unlock(&xsoftc.xpt_lock);

                                 continue;

                         } else {

                                 /*
Scott
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-----Original Message-----

From: Scott Long [mailto:scottl@samsco.org]

Sent: Sunday, December 16, 2007 2:48 AM

To: Michael Jung

Cc: freebsd-current@freebsd.org

Subject: Re: 7.0-BETA4 - witness_warn on boot
This simple patch should fix it.  This code path is pretty rare, though,

I'm frankly shocked that you're running into it.
--- cam_xpt.c   20 Oct 2007 23:23:12 -0000      1.191

+++ cam_xpt.c   16 Dec 2007 07:46:22 -0000

@@ -3862,6 +3862,7 @@

                                                    &work_ccb->ccb_h,

                                                    xpt_links.stqe);
+                               mtx_unlock(&xsoftc.xpt_lock);

                                 continue;

                         } else {

                                 /*
Scott
"freebsd-current-unsubscribe@freebsd.org"
Scott,
Any chance on getting this committed?  It's been working great but

requires me to

patch after every cvsup.
Thanks.
--mikej
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Thanks for the reminder, I'll take care of it.
Scott
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