re:
https://tracker.ceph.com/issues/49387 (rgw) and
https://tracker.ceph.com/issues/49240 (mgr etc.)
Mark and Yuval have shown that these crashes reproduce on fedora 33
only after tcmalloc is upgraded from 2.7 to 2.8. I'm guessing that
upgrade was installed on the smithis and gibbas somewhere around the
beginning of February when these crashes started showing up.
It looks like there was a regression in 2.8 that was reverted in 2.8.1:
https://github.com/gperftools/gperftools/commit/02d5264018cc76a36713f973298…