Since moving to Py3 (or around about that time) the pstree output isn't pretty anymore: $ pstree -p 11785 python3(11785)───python3(11789)─┬─pseudo(11883)───python3(11884)─┬─python3(1106) │ ├─python3(1362)───run.BUILDSPEC.1(2603)───rpmbuild.real(2604) │ ├─python3(3171)───run.BUILDSPEC.3(17927)───rpmbuild.real(17961) │ ├─python3(15955) │ ├─python3(18458)───sh(17035)───x86_64-poky-lin(17050) │ └─python3(32320)───sh(17002)───opkg-build(17004)───ar(17193) It used to say Cooker, WorkerQueue, etc etc.
Fixed in bitbake 6576a9a95486c28a01d4211b4a33cc3e2c55a7cc.