A version of efence with the mutex stuff disabled, that does not link
to libpthread, would be nice. When a binary is linked to libpthread,
gdb's threading support is activated.

==
 <drow> yes, gdb native thread support sucks flying goat arse.
==

Suffice it to say that this makes gdb erratic.

[I'd provide a patch, but it's trivial to do and has to be done
upstream anyway, since it's an ABI change and needs to be properly
versioned].