From owner-freebsd-questions@FreeBSD.ORG  Fri Feb  1 15:30:41 2008
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Date: Fri, 1 Feb 2008 16:30:40 +0100 (CET)
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Subject: strange panic: freebsd 6.3: ffs_alloccg: map corrupted
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hi folks,

during copying ~350GB from one volume to another on
the local machine (separate disks, separate fs's) i
get the following panic:

start = 0, len = 23691, fs = /newdata
panic: ffs_alloccg: map corrupted
KDB: enter: panic
[ thread pid 835 tid 10070 ]
stopped at kdb_enter +0x2c:  leave

the destination filesystem i created from scratch
today, and the other which is read from is fsck'd.

because of privacy/security considerations, i cannot
really post the whole configuration of the machine
(like fs-layout, other details, dmesg will be ok if
needed).

the backtrace can be viewed on this image:
http://www.mgedv.at/panic_ffs_alloccg.png

any ideas how to react on this?

cheers...