assembly and lines intermixed

gistfile1.txt

objdump -S /usr/sbin/varnishd | awk '/00000000004836f0/ {flag=1;next}
/0000000000483a30/{flag=0} flag {print}' | while read addr asm
do
  line=`addr2line -i -e /usr/sbin/varnishd $addr`
  if [ "x$line" != "x$last" ]
  then
    echo "$addr $line"
  fi
  echo "$asm"
  last="$line"
done > foo.txt

Just a quick point: the two addresses in the AWK command are just to delimit which function is being dumped, and this will probably break on more than one fuction. :)