Travis build shows core dumps

[StefanScherer]

In PR #3 some builds in Travis showed a core dump:

https://travis-ci.org/hypriot/rpi-java/builds/192465117#L408

Setting up ca-certificates-java (20140324) ...
qemu: uncaught target signal 11 (Segmentation fault) - core dumped
/var/lib/dpkg/info/ca-certificates-java.postinst: line 40:  4732 Done                    echo -e "-diginotar_root_ca\n-diginotar_root_ca_pem"
      4734 Segmentation fault      (core dumped) | java -Xmx64m -jar $JAR -storepass "$storepass"
qemu: uncaught target signal 11 (Segmentation fault) - core dumped
/var/lib/dpkg/info/ca-certificates-java.postinst: line 40:  4737 Done                    find /etc/ssl/certs -name \*.pem
      4739 Broken pipe             | while read filename; do
    alias=$(basename $filename .pem | tr A-Z a-z | tr -cs a-z0-9 _); alias=${alias%*_}; if [ -n "$FIXOLD" ]; then
        echo "-${alias}"; echo "-${alias}_pem";
    fi; echo "+${filename}";
done
      4740 Segmentation fault      (core dumped) | java -Xmx64m -jar $JAR -storepass "$storepass"
done.
Processing triggers for libc-bin (2.19-18+deb8u6) ...
Processing triggers for systemd (215-17+deb8u5) ...
Processing triggers for ca-certificates (20141019+deb8u1) ...
Updating certificates in /etc/ssl/certs... 0 added, 0 removed; done.
Running hooks in /etc/ca-certificates/update.d....
qemu: uncaught target signal 11 (Segmentation fault) - core dumped
Segmentation fault (core dumped)
E: /etc/ca-certificates/update.d/jks-keystore exited with code 1.
done.
 ---> fdfed3639deb
Removing intermediate container 7f0d0397d043

[trycoon]

This could be related: https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=706237