git error – can’t push to github – pack-objects died of signal 9

Try this:

git config --global pack.windowMemory "32m"

pack.windowMemory::
    The maximum size of memory that is consumed by each thread
    in linkgit:git-pack-objects[1] for pack window memory when
    no limit is given on the command line.  The value can be
    suffixed with "k", "m", or "g".  When left unconfigured (or
    set explicitly to 0), there will be no limit.