In this session Carl and Christoph only wanted to quickly fix some internal interfaces of the FreespaceManager.
While fixing the test case to actually test migration between FreespaceManagers they find a severe bug in FreeSpaceManager migration. In the process of this (very long) session they hunt down the issue and also recover space that was previously lost in migration.
This session demonstrates many debugging techniques and how DTrace can be helpful to focus on the place in the code where things go wrong.
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