Created attachment 752090 [details] build.log Already run smartctl for ssd that is using btrfs, with gentoo sources 5.10.76-gentoo-r1 compiled for CPU x86_64 AMD Ryzen 5 2400G with Radeon Vega Graphics AuthenticAMD, and short and long tests don't catch any error. But anytime I'm emerge this ebuild it always hangs in config phase on different steps. Don't understand why this is happening since I can't see any hardware issues.
Created attachment 752094 [details] build.log
Created attachment 752098 [details] emerge.info
Created attachment 752102 [details] emerge.pqv
Created attachment 752106 [details] ps faux
I would suggest you try with FEATURES="-ccache -sandbox -userpriv -usersandbox -pid-sandbox -network-sandbox -ipc-sandbox" and see if situation changes.
Don't know why, but today without changing any flag, worked after emerge world... Going to close this bug since I can't reproduce it again.