activate best chain crash #6947

I got this error after starting the client but pointing to a directory that already had my data (wallet, some of the chain). I got stuck on "activating best chain". I used the -rescan method but nothing happened.

Then I deleted everything except my wallet and tried to download again the blockchain.

I got this error in the debug.log after crashing

2015-11-04 22:59:11 *** System error while flushing: CDB: Error -30974, can't open database 2015-11-04 22:59:34 ERROR: ProcessNewBlock: ActivateBestChain failed 2015-11-04 22:59:34 addcon thread interrupt 2015-11-04 22:59:34 opencon thread interrupt 2015-11-04 22:59:34 net thread interrupt 2015-11-04 22:59:34 scheduler thread interrupt 2015-11-04 22:59:34 msghand thread interrupt 2015-11-04 22:59:34 Shutdown: In progress... 2015-11-04 22:59:34 StopNode() 2015-11-04 22:59:35 *** System error while flushing: CDB: Error -30974, can't open database

file wallet.dat has LSN 1/5930, past end of log at 1/476 Commonly caused by moving a database from one database environment to another without clearing the database LSNs, or by removing all of the log files from a database environment DB_ENV->log_flush: LSN of 1/5930 past current end-of-log of 1/476 Database environment corrupt; the wrong log files may have been removed or incompatible database files imported from another environment PANIC: DB_RUNRECOVERY: Fatal error, run database recovery wallet.dat: unable to flush page: 53 PANIC: fatal region error detected; run recovery PANIC: fatal region error detected; run recovery PANIC: fatal region error detected; run recovery PANIC: fatal region error detected; run recovery PANIC: fatal region error detected; run recovery PANIC: fatal region error detected; run recovery PANIC: fatal region error detected; run recovery PANIC: fatal region error detected; run recovery PANIC: fatal region error detected; run recovery File handles still open at environment close Open file handle: /media/aris/DATA/bitcoinData/database/log.0000000001 PANIC: fatal region error detected; run recovery

rescan is for the wallet the option you want is reindex

That is a really scary error. Your wallet is corrupted. Are you perhaps trying to use a wallet from a bitcoin core version bulit with another version of berkeleydb? (built with --with-incompatible-bdb).

If not, and you have a recent backup, try restoring that. If not, make a backup as soon as possible and try -salvagewallet. Hopefully your keys can be recovered.

@arisAlexis /media/... - is this some form of removable storage or similar?

wallet was ok , everything is working after deleting all the chains folder and downloading it all over