As you've probably heard we have some new scripts generated by our build that allow you to reproduces an entire build or just that build's kernel[1].
In the event you encounter a bug, please feel free to report it at:
https://bugs.launchpad.net/linaro-android-build-tools/+filebug
1: See linaro_android_build_cmds.sh and linaro_kernel_build_cmds.sh