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 13 2014-12-10 22:34:28 <huma_> i've got this error during reindexing: "LevelDB read failure: Corruption: block checksum mismatch". does it mean the actual blockchain data on disk is currupt? is it recommended to download the blockchain from scratch?
 14 2014-12-10 22:34:59 <op_null> no, blocks on disk aren't stored in a leveldb, just the unspent outputs database.
 15 2014-12-10 22:35:30 <op_null> a reindex agressively tries to recover from bad blocks on disk.
 16 2014-12-10 22:36:07 <phantomcircuit> op_null, that specific error might indicate a corrupt block file
 17 2014-12-10 22:36:11 <iwilcox> huma_: Did you memtest yet?
 18 2014-12-10 22:36:42 <phantomcircuit> nope that's just a leveldb failure
 19 2014-12-10 22:36:53 <phantomcircuit> which indicates a hw issue almost certainly
 20 2014-12-10 22:37:09 <phantomcircuit> note leveldb does not provide strong guarantees with failing hw
 21 2014-12-10 22:37:21 <phantomcircuit> so using that system would probably be ill advised
 22 2014-12-10 22:37:22 <huma_> iwilcox: not yet. odd, this system has been smooth for a few years.
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 26 2014-12-10 22:38:40 <iwilcox> huma_: Those things can be surprisingly subtle.
 27 2014-12-10 22:38:49 <huma_> eh, only 35 weeks behind left
 28 2014-12-10 22:39:43 <op_null> phantomcircuit: if it's during index though, isn't that unlikely?
 29 2014-12-10 22:40:40 <phantomcircuit> op_null, leveldb only correctly identifies very specific classes of hw errors
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 31 2014-12-10 22:41:07 <phantomcircuit> specifically afaict it only corrects mutations which do not change the record size (since that's silently ignored!)
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 40 2014-12-10 22:52:47 <gmaxwell> huma_: you're almost certantly suffering hardware induced data corruption.
 41 2014-12-10 22:53:31 <Diablo-D3> aaaand I bet its his power supply
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 54 2014-12-10 23:05:14 <op_null> that could be a fun project, have thousands of computers over the world do a deterministic action and send back the results. see what sort of junk people's computers make.
 55 2014-12-10 23:06:33 <phantomcircuit> op_null, i know for certain my workstation would fail
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 58 2014-12-10 23:06:47 <phantomcircuit> there's about 512MB of high mem which random does bit flips
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 60 2014-12-10 23:07:01 <phantomcircuit> i cant get the sodimm out to replace it though
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 64 2014-12-10 23:08:01 <op_null> phantomcircuit: bet it would make better random numbers than blockchain.info :)
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 66 2014-12-10 23:09:45 <phantomcircuit> op_null, possibly
 67 2014-12-10 23:10:15 <op_null> phantomcircuit: if you have more than 8 bits of entropy you'd win that shoot out.
 68 2014-12-10 23:10:19 <moa> cosmic rays
 69 2014-12-10 23:10:30 <wyager> op_null: IIRC, Google did a study that showed that, at sea level, you expect something like .25 random bit flips per hour per gig of non-error-corrected RAM. So you just need to use a few GB*hours to have a reasonable expectation of a bit flip
 70 2014-12-10 23:10:48 <op_null> wyager: woah, that high?
 71 2014-12-10 23:10:51 <wyager> Yeah
 72 2014-12-10 23:10:55 <wyager> even higher at high altitudes
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 74 2014-12-10 23:11:13 <op_null> I'm stunned we don't have more problems with that in Bitcoin then
 75 2014-12-10 23:11:46 <wyager> In what respect? Some wallets do software RAM error correction, I think. Namely Armory
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 80 2014-12-10 23:14:00 <wyager> Oops, it was .025-.07, not .25. Still pretty high
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 82 2014-12-10 23:14:29 <op_null> that's still way way above what I was expecting.
 83 2014-12-10 23:14:42 <op_null> I guess for 99% of the time it doesn't matter
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112 2014-12-10 23:40:34 <huma_> the first time i got "hashMerkleRoot mismatch" error (during regular blockchain update, on another disk) i also got this error repeatedly along with the merkle problem: "Misbehaving: 108.170.37.114:8333 (0 -> 100) BAN THRESHOLD EXCEEDED". is it of any significance to my problem?
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