Comment 18 for bug 1921664

From my test PPAs the version "1:5.2+dfsg-9ubuntu2~hirsuteppa3" which is a no-change rebuild of the formerly working "1:5.2+dfsg-9ubuntu1" did in three tries fail three times.

So we are not looking at anything that is in the qemu source or the Ubuntu/Debian Delta applied to it. But at something in the build environment that now creates binaries behaving badly, which built on 2021-03-23 worked fine.
Since I have no idea yet where exactly to look at I'll add "the usual suspects" of glibc, gcc-10 and binutils - also Doko/Rbalint (who look after those packages) have seen a lot might have an idea about what might be going on here.