Having just done a 'make build' to move from a -current of around November
to -current as of 23 February (which completed successfully), I rebooted
(now running a recent -current), and did a 'make release' so I could have
good snapshot of a system.  (this is on port-i386)

The majority of the build took place on my /scratch partition, which is a
6+ gig LFS partition, about 20% full.

Somewhere during the install phase, I got the following panic:

[ installing merrily ] 

(cd etc.i386; install  -c -o root  -g wheel -m 444 fstab.* /scratch/build/etc)
(cd /scratch/build/dev; ./MAKEDEV all)
(cd ../usr.bin/mail; make distribution)
cd /scratch/src/usr.bin/mail/misc; install -c -o root -g wheel  -m 644 mail.rc /scratch/build/etc
(cd ../gnu/usr.sbin/sendmail/cf/cf; make distribution)
install -c -o root -g wheel -m 444 netbsd-proto.cf  /scratch/build/etc/sendmail.cf
/scratch/build/usr/libexec/sendmail/sendmail -C /scratch/build/etc/sendmail.cf -O AliasFile=/scratch/build/etc/aliases -bi
panic: lfs_truncate: frag count < 0 (32<64), ino 8602
                                                     
Stopped in sendmail at  cpu_Debugger+0x4:       leave
db> trace                                                  
cpu_Debugger(c9a65c80,40,c061bf00,c9a7fda8,c0230018) at cpu_Debugger+0x4
panic(c02e7dc0,20,40,219a,c9a7fe1c) at panic+0x55                       
lfs_truncate(c9a7fdcc) at lfs_truncate+0x1070    
ufs_setattr(c9a7fe08,0,c9a7ff88,fffffffb,c06a5a80) at ufs_setattr+0x1d4
vn_open(c9a7fed8,423,1a4,c9a7ff88,c99f1c84) at vn_open+0x319           
sys_open(c99f1c84,c9a7ff88,c9a7ff80,0,80a9200) at sys_open+0xd0
syscall() at syscall+0x23a                                     
--- syscall (number 5) ---
0x4811d58b:               
db>


... at which point I rebooted.  If there's anything else I should do with
a panic of this nature, please let me know.

+j

-- 
Jeff Rizzo                                         http://boogers.sf.ca.us/~riz