Comment 3 for bug 1157795

As of today, I have a similar issue with other branches: I have built gcc-4.8+bzr122581 so that it can serve as a reference for my gcc-4.8+bzr122581~christophe-lyon~gcc-4.9-disable-peeling3
and
gcc-4.8+bzr122582~christophe-lyon~4.9-revert-coalesce-vars
but none of them has testsuite-diff.txt generated.

Running cron-often.sh manually shows these related messages:
INFO:root:No known ancestor to gcc-4.8+bzr122581~christophe-lyon~gcc-4.9-disable-peeling3
INFO:root:No known ancestor to gcc-4.8+bzr122581~christophe-lyon~gcc-4.9-disable-peeling3
INFO:root:No known ancestor to gcc-4.8+bzr122581~christophe-lyon~gcc-4.9-disable-peeling3
INFO:root:No known ancestor to gcc-4.8+bzr122581~christophe-lyon~gcc-4.9-disable-peeling3
INFO:root:No known ancestor to gcc-4.8+bzr122581~christophe-lyon~gcc-4.9-disable-peeling3
INFO:root:No known ancestor to gcc-4.8+bzr122581~christophe-lyon~gcc-4.9-disable-peeling3
INFO:root:No known ancestor to gcc-4.8+bzr122581~christophe-lyon~gcc-4.9-disable-peeling3
DEBUG:root:Can't find ./gcc-4.8+bzr122582~christophe-lyon~4.9-revert-coalesce-vars/logs/armv7l-precise-cbuild452-tcpanda11-cortexa9hfr1/objc.sum.xz of lp:gcc+bzr122581
DEBUG:root:Can't find ./gcc-4.8+bzr122582~christophe-lyon~4.9-revert-coalesce-vars/logs/armv7l-precise-cbuild453-calxeda01_04_00_precise_armhf-cortexa9hfr1/objc.sum.xz of lp:gcc+bzr122581
DEBUG:root:Can't find ./gcc-4.8+bzr122582~christophe-lyon~4.9-revert-coalesce-vars/logs/i686-precise-cbuild449-oort2-i686r1/objc.sum.xz of lp:gcc+bzr122581
DEBUG:root:Can't find ./gcc-4.8+bzr122582~christophe-lyon~4.9-revert-coalesce-vars/logs/x86_64-precise-cbuild449-oort3-x86_64r1/objc.sum.xz of lp:gcc+bzr122581
DEBUG:root:Can't find ./gcc-4.8+bzr122582~christophe-lyon~4.9-revert-coalesce-vars/logs/x86_64-precise-cbuild449-oort3-xaarch64_barer1/libstdc++.sum.xz of lp:gcc+bzr122581
DEBUG:root:Can't find ./gcc-4.8+bzr122582~christophe-lyon~4.9-revert-coalesce-vars/logs/x86_64-precise-cbuild449-oort3-xaarch64r1/libstdc++.sum.xz of lp:gcc+bzr122581
DEBUG:root:Can't find ./gcc-4.8+bzr122582~christophe-lyon~4.9-revert-coalesce-vars/logs/x86_64-precise-cbuild449-oort3-xcortexa15hfr1/objc.sum.xz of lp:gcc+bzr122581
INFO:root:No known ancestor to gcc-4.9+bzr122581
INFO:root:No known ancestor to gcc-4.9+bzr122581
INFO:root:No known ancestor to gcc-4.8+bzr122581~christophe-lyon~gcc-4.9-disable-peeling3
DEBUG:root:Can't find ./gcc-4.8+bzr122582~christophe-lyon~4.9-revert-coalesce-vars/logs/armv7l-precise-cbuild453-tcpanda11-cortexa9hfr1/benchmarks-spec2000.txt of lp:gcc+bzr122581
INFO:root:No known ancestor to gcc-4.8+bzr122581~christophe-lyon~gcc-4.9-disable-peeling3
DEBUG:root:Can't find ./gcc-4.8+bzr122582~christophe-lyon~4.9-revert-coalesce-vars/logs/armv7l-precise-cbuild453-tcpanda11-cortexa9hfr1/benchmarks-eembc.txt of lp:gcc+bzr122581
INFO:root:No known ancestor to gcc-4.8+bzr122581~christophe-lyon~gcc-4.9-disable-peeling3
DEBUG:root:Can't find ./gcc-4.8+bzr122582~christophe-lyon~4.9-revert-coalesce-vars/logs/armv7l-precise-cbuild453-tcpanda11-cortexa9hfr1/benchmarks-eembc_office.txt of lp:gcc+bzr122581

But if one looks at the snapshots page,
http://cbuild.validation.linaro.org/snapshots/gcc-4.8%2bbzr122581~christophe-lyon~gcc-4.9-disable-peeling3.txt
and
http://cbuild.validation.linaro.org/snapshots/gcc-4.8%2bbzr122582~christophe-lyon~4.9-revert-coalesce-vars.txt
both mention 122581 as their ancestor.

What is going wrong?