Comment 6 for bug 1923505

I am now seeing similar build failures (where the build hangs forever before eventually being killed) when building the firefox 89.0 release candidate, on pcc64el, on bionic and focal (the version of rustc is 1.47.0+dfsg1+llvm-1ubuntu1. Groovy, hirsute and impish are not affected. I need to look into it further to understand if the hang also happens when building the webrender crate.