git pull --recurse-submodules hangs

[dmik]

If there is a configured submodule in a repository, doing

git pull --recurse-submodules

hangs there forever. Aborting it spits the following:

Fetching submodule src/3rdparty
fetch-pack: unexpected disconnect while reading sideband packet
fatal: early EOF
fatal: index-pack failed
Errors during submodule fetch:
        src/3rdparty

Note that it's not a 2.30 regression. The same hang happens with our current RPM git version 2.11.0.

With extensive tracing enabled, I see this endlessly repeating:

01:54:25.549000 http.c:756              == Info: SSLv2, Unknown (23):

Not sure it is related though.

[dmik]

Note also that going into the submodule dir and running git pull there directly works like a charm.