Hey, when I try to launch monerod I get this error message:

2017-Jan-05 17:53:50.053754 ERROR /DISTRIBUTION-BUILD/src/cryptonote_core/cryptonote_core.cpp:391 Error opening database: Failed to query m_blocks: MDB_BAD_TXN: Transaction must abort, has a child, or is invalid

Is this a bug? Is this known?

[edit: when I try to run it with a log level > 1 I get a memory access violation]

greetings