ffs_alloccg panics in 5.2 RC2

I'm getting repeated panics. I'm a current newbie and
am still working on building a debug kernel. In the
meantime I'll post what I know.

I'm using an unchanged GENERIC kernel on a single CPU
machine. Not accessing the CD drive. I have only IDE
drives (no SCSI) on this system. I've read most of the
recent panic-related messages on this list and haven't
seen my panic mentioned.

uname -a
FreeBSD mydomain.com 5.2-RC2 FreeBSD 5.2-RC2 #0: Mon
Dec 22 07:23:48 GMT 2003
root_at_wv1u.freebsd.org:/usr/obj/usr/src/sys/GENERIC 
i386

Here is the message, typed in by hand:
start=0, len=2, fs=/mnt/mx01b
panic: ffs_alloccg: map corrupted
cpuid=0;
syncing disks, buffers remaining... panic: bremfree:
removing a buffer not on a queue
cpuid=0;
uptime: 4h27m7s
shutting down ACPI
auto reboot in 15 seconds
...

This system is running a handful of user processes
(~20) that are reading and writing many different
files at the same time. One process periodically
extracts the contents of a different zip file,
containing around 1,000 files, every hour or so. Other
processes are making heavy use of the net, downloading
data, and storing files, as well as updating files.

These panics were happening with 5.1, and have
continued on a regular basis (every few hours or so)
with 5.2. My installation was done using the CD ISO
downloaded from the freebsd mirrors. I used the
default UFS2 filesystem (except for the root
partition, of course). Although I did it as a fresh
install (not an update) it appears to have remembered
some of my settings from 5.1. Not sure if all this is
relevant; just trying to give as much information as I
can.

Recently I also got another panic, ffs_blkfree... I
don't have the full message for that one though.

I'm going through the FAQ item to see how to send more
information to this list, but wanted to start out with
this message while I work on that in the background.
Any suggestions appreciated. Thanks.


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