On my debian squeeze server in the chkrootkit log I get loads of these errors:/usr/bin/find: Proze head wurde durch das Signal 13 abgebrochen./usr/bin/find: Proze head wurde durch das Signal 13 abgebrochen.which meanshead terminated by signal 13A google search gives a lot of same problems, but no solution.It comes from these lines in /usr/sbin/chkrootkit:if [ `echo abc | head -n 1` = abc ]; then      fileshead=`${find} ${ROOTDIR}tmp ${ROOTDIR}var/tmp ${findargs} -type f -exec head -n 1 {} \; | $egrep '#!.*php' 2> /dev/null`else      fileshead=`${find} ${ROOTDIR}tmp ${ROOTDIR}var/tmp ${findargs} -type f -exec head -1 {} \; | grep '#!.*php' 2> /dev/null`fiwhen I enter directly as root:/usr/bin/find /var/tmp -type f -exec head -1 {} \; | grep php 2> /dev/null;dateI get the same errors. egrep instead makes no difference.
chkrootkit throws Signal 13 when searching through /var/tmp
chkrootkit
chkrootkit searches for PHP files in /tmp/ and /var/tmp directories. Most likely, some files there trigger the bug.In my case, it was a test file with lots of zero bytes - deleting the file solved the issue.