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From: Jaye Mathisen <mrcpu@cdsnet.net>
To: hackers@freebsd.org
Subject: FreeBSD crash
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-current from about 3/21.  P5-90, adaptec 2940, 2940UW.

GDB 4.13 (i386-unknown-freebsd), 
Copyright 1994 Free Software Foundation, Inc...(no debugging symbols 
found)...
IdlePTD 1d7000
current pcb at 1cde80
panic: ffs_valloc: dup alloc
#0  0xf019bca3 in boot ()

(kgdb) where
#0  0xf019bca3 in boot ()
#1  0xf0111926 in panic ()
#2  0xf017e073 in ffs_valloc ()
#3  0xf0189fc2 in ufs_makeinode ()
#4  0xf0187a25 in ufs_create ()
#5  0xf012d60c in vn_open ()
#6  0xf012ae43 in open ()
#7  0xf01a400d in syscall ()
#8  0xf0199305 in Xsyscall ()
#9  0x4e09 in ?? ()
#10 0xc573 in ?? ()
#11 0xe009 in ?? ()
#12 0xe3c7 in ?? ()
#13 0x90e3 in ?? ()
#14 0xbb30 in ?? ()
#15 0x1095 in ?? ()


Not sure what else you want that may help.  I could compile a kernel with 
debugging, since it's happening moderately frequently if you'd like.