kernel_module
kernel_module has a tearDown method implemented that overwrites the parent's class (oeRuntimeTest) tearDown and because of this, the dumps doesn't work
There are other classes that have a tearDown method defined: _ptest, buildcvs, buildiptables, buildsudoku, date, gcc, kernelmodule, perl, python, rpm, and smart
It is necessary to have define a tearDownLocal method to handle the individual tearDown cases from the tests.
Please disregard the classes mentioned previously. The only classes that have tearDown or setUp methods are: _ptest date kernelmodule scanelf
Sent patches to the mailing list
Fixed in oe-core 13282223b07787a92c251f89251e8a49a0e4e3eb.