BITCOIN CORE CRASHED

[tomatemozarella]

Hello !
I am using Bitocin core v0.11.2 without problem since a few months now.
This morning when i restarted my computer Bitcoin core did not restarted and i got the message:
" Error: a fatal internal error occured, see debug.log for details ".
I installed v0.12.1 and i got same message.
It seems block verification is Ok then program crashes !

This is the last message debug file:

2016-05-21 07:36:01 Bitcoin version v0.12.1 (2016-04-11 13:01:43 +0200)
2016-05-21 07:36:01 InitParameterInteraction: parameter interaction: -whitelistforcerelay=1 -> setting -whitelistrelay=1
2016-05-21 07:36:01 GUI: "registerShutdownBlockReason: Successfully registered: Bitcoin Core didn't yet exit safely..."
2016-05-21 07:36:03 Using BerkeleyDB version Berkeley DB 4.8.30: (April 9, 2010)
2016-05-21 07:36:03 Default data directory C:\Users\alex\AppData\Roaming\Bitcoin
2016-05-21 07:36:03 Using data directory C:\Users\alex\AppData\Roaming\Bitcoin
2016-05-21 07:36:03 Using config file C:\Users\alex\AppData\Roaming\Bitcoin\bitcoin.conf
2016-05-21 07:36:03 Using at most 125 connections (2048 file descriptors available)
2016-05-21 07:36:03 Using 2 threads for script verification
2016-05-21 07:36:03 Using wallet wallet.dat
2016-05-21 07:36:03 scheduler thread start
2016-05-21 07:36:03 init message: Vérification du portefeuille...
2016-05-21 07:36:03 CDBEnv::Open: LogDir=C:\Users\alex\AppData\Roaming\Bitcoin\database ErrorFile=C:\Users\alex\AppData\Roaming\Bitcoin\db.log
2016-05-21 07:36:03 Bound to [::]:8333
2016-05-21 07:36:03 Bound to 0.0.0.0:8333
2016-05-21 07:36:03 Cache configuration:
2016-05-21 07:36:03 * Using 2.0MiB for block index database
2016-05-21 07:36:03 * Using 32.5MiB for chain state database
2016-05-21 07:36:03 * Using 65.5MiB for in-memory UTXO set
2016-05-21 07:36:03 init message: Chargement de l'index des blocs...
2016-05-21 07:36:03 Opening LevelDB in C:\Users\alex\AppData\Roaming\Bitcoin\blocks\index
2016-05-21 07:36:03 Opened LevelDB successfully
2016-05-21 07:36:03 Using obfuscation key for C:\Users\alex\AppData\Roaming\Bitcoin\blocks\index: 0000000000000000
2016-05-21 07:36:03 Opening LevelDB in C:\Users\alex\AppData\Roaming\Bitcoin\chainstate
2016-05-21 07:36:03 Opened LevelDB successfully
2016-05-21 07:36:03 Using obfuscation key for C:\Users\alex\AppData\Roaming\Bitcoin\chainstate: 0000000000000000
2016-05-21 07:36:17 LoadBlockIndexDB: last block file = 522
2016-05-21 07:36:17 LoadBlockIndexDB: last block file info: CBlockFileInfo(blocks=153, size=125227861, heights=412442...412607, time=2016-05-19...2016-05-20)
2016-05-21 07:36:17 Checking all blk files are present...
2016-05-21 07:36:18 LoadBlockIndexDB: transaction index disabled
2016-05-21 07:36:18 LoadBlockIndexDB: hashBestChain=000000000000000004b8c41d4917e7fe1f36b1dfb16ff9ab1fc48bac2732c1d2 height=412590 date=2016-05-20 15:18:53 progress=0.999597
2016-05-21 07:36:18 init message: Vérifications des blocs...
2016-05-21 07:36:18 Verifying last 288 blocks at level 3
2016-05-21 07:37:22 No coin database inconsistencies in last 12 blocks (18790 transactions)
2016-05-21 07:37:22 block index 79575ms
2016-05-21 07:37:22 init message: Chargement du porte-monnaie...
2016-05-21 07:37:22 nFileVersion = 120100
2016-05-21 07:37:22 Keys: 182 plaintext, 0 encrypted, 71 w/ metadata, 182 total
2016-05-21 07:37:22 wallet 127ms
2016-05-21 07:37:22 init message: Activation de la meilleure chaîne...
2016-05-21 07:37:22 ERROR: CheckProofOfWork(): nBits below minimum work
2016-05-21 07:37:22 ERROR: ReadBlockFromDisk: Errors in block header at CBlockDiskPos(nFile=522, nPos=124229782)
2016-05-21 07:37:22 *** Failed to read block
2016-05-21 07:37:29 scheduler thread interrupt
2016-05-21 07:37:29 Shutdown: In progress...
2016-05-21 07:37:29 StopNode()
2016-05-21 07:37:29 Shutdown: done

What to do ?
Let me know if u need more details
Is it possible to save my wallet and use it with another program if needed ?
Thanks a lot !

[pstratem]

Hardware failure.

[tomatemozarella]

So what to do ?
I copied all datas file of bticoin Core to another computer and i got the same message Error.
So what can i do now ??

[pstratem]

reindex

[tomatemozarella]

thanks for you help but what is reindex ?
Do you think i have to re-download all blocks from beginning ?
That will solve the problem ?
I am in india with a slow connection....

[sipa]

Start bitcoind or bitcoin-qt with the -reindex command line option. This will throw away the indexes and rebuild them from scratch, but reuse the blocks on disk in so far as they are usable.

[tomatemozarella]

Great answer !
Can i do this with Windows ?

[tomatemozarella]

in cmd.exe ? it will work ?

[sipa]

yes

[tomatemozarella]

great !
Thanks a lot
i have bitcoind.exe and bitcoin-cli.exe
bitcoind.exe is best ?

[maflcko]

It would also work with bitcoin-qt.exe if that's what you are using.

[tomatemozarella]

ok
i have bitcoin-qt.exe in directory Bitcoin
and
bitcoind.exe + bitcoin-cli.exe in directory Bitcoin/daemon
I have started " bitcoind.exe -reindex "
It is running ...
Any idea how long it will take ? :-)

[maflcko]

Could make sense to add steps for windows to https://en.bitcoin.it/wiki/Running_Bitcoin, which is the first result for "reindex bitcoin windows" on google

[tomatemozarella]

Thanks for the link !
Command line still running ...
Any idea of the time needed to rebuilt index with a slow internet connection ?

[sipa]

@tomatemozarella Close it, and run bitcoin-qt as you normally do instead. I will show a progress bar.

[tomatemozarella]

ok thanks man !

[tomatemozarella]

Very nice to have your support !
much appreciated !!