If you have a folder named ~/.gitconfig instead of a file with that
name, when you try to run some global config editing command it will
fail with a wrong error message:
"fatal: Out of memory? mmap failed: No such device"
You can reproduce it:
$rm ~/.gitconfig
$mkdir ~/.gitconfig
$ls -la ~
...
drwxr-xr-x 24 hit hit 4096 may 4 12:30 .gimp-2.8
drwxr-xr-x 2 hit hit 4096 may 27 15:26 .gitconfig
drwxr-xr-x 6 hit hit 4096 may 27 14:01 github
...
$git config --global user.name foo
fatal: Out of memory? mmap failed: No such device
$git config --global core.editor "vim"
fatal: Out of memory? mmap failed: No such device
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