i could reproduce this by creating a 2GB file with only zero bytes:
dd if=/dev/zero of=/var/tmp/nullbytes count=1 bs=2000M
then the part in the chkrootkit source creates the crash:
/usr/bin/find /var/tmp -type f -exec head -1 {} \; | grep php 2>
/dev/null;date
deleting that temp file is a temporary solution. A pity, that I don't
know, how such a file could have been created there in the first place .
see
http://unix.stackexchange.com/questions/86866/chkrootkit-throws-signal-13-when-searching-through-var-tmp
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