I'm building from the master branch.Today after I doing a "make distclean" and re-selected my target I find I'm unable to re-download glibc 2.32 from the the public servers. The source seems to now be missing from both mirrors, and curl gets a 404 error from each:
Assuming you have glibc selected through "make menuconfig" this can be easily reproduced with these commands:
$ rm -f dl/glibc-2.32-*.tar.xz
$ make toolchain/glibc/download V=sc