Can't upgrade, install or uninstall port

[Emmanuel Marin]

Hello,
I have recently upgrade my MacBook Pro with Yosemite. Today I  have installed the new version of Macport with success. 
After that I have tried to upgrade ports with the command ’sudo port upgrade outdated’ and everything was good at the beginning but after 2 or 3 hours of work my Mac  close the session.

Now when I want to use Macport for example to upgrade qtiplot after using ‘sudo port upgrade qtiplot’ everything is freeze with this message ‘Waiting for lock on /opt/local/var/macports/registry/.registry.lock’.

I have tried to re-install MacPort but nothing change.

What should I do with my Macport?

Thank-you 
Emmanuel
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