This is forked from bug 8234 which is about qemu segfaulting in the middle of a test run. Obviously qemu shouldn't segfault but there should also be a mechanism that stops running the tests when qemu dies.
RP has a patch on list: "oeqa: Test failure/cleanup improvements"
http://git.yoctoproject.org/cgit.cgi/poky/commit/?id=a14c36340961f749514bea1f78347a758509c8fa
Verified on a14c36340961f749514bea1f78347a758509c8fa.