Olivier Nicole wrote at 15:14 +0700 on Oct 12, 2007:
 > Hi,
 > 
 > I just upgraded amanda-client and gtar:
 > 
 > gtar-1.18_1         GNU version of the traditional tar archiver
 > amanda-client-2.5.1p3_1,1 The Advanced Maryland Automatic Network Disk 
 > Archiver
 > 
 > on a 5.5 server
 > 
 > FreeBSD ufo.cs.ait.ac.th 5.5-RELEASE-p15 FreeBSD 5.5-RELEASE-p15 #7: Wed Oct 
 >  3 10:17:29 ICT 2007     root AT ufo.cs.ait.ac DOT 
 > th:/usr/obj/usr/src/sys/GENERIC  i386
 > 
 > and last night bacup failed with sendsize coredump.
 > 
 > kernel: Oct 12 00:50:59 ufo kernel: pid 64313 (sendsize), uid 14: exited on 
 > signal 11 (core dumped)
 > 
 > 
 > While I am looking at it, any idea about where I could search is welcome.
 > 
 > Best regards,
 > 
 > Olivier

Can you show the gdb backtrace?