So….this happened:
$ app/console --domain=myDomain cache:clear Clearing the cache for the dev environment with debug true Segmentation fault
Apparently Segfaults happen, when a process tries to access a portion of RAM that’s already used otherwise.
Removing the app/cache folder contents fixed the problem:
$ app/console --domain=myDomain cache:clear Clearing the cache for the dev environment with debug true Done $