Bitcoin Core 0.17.0 sync stuck at block 553342

NotATether

legendary

Activity: 1568

Merit: 6660

bitcoincleanup.com / bitmixlist.org

Quote from: odolvlobo on December 24, 2018, 11:51:50 AM

I deleted the last blk.dat and rev.dat files and restarted. It re-indexed all the blocks and continued syncing and now I'm up-to-date. Thanks for the suggestion and the link.

I have some suggestions for any core developers that might read this:

1. Since this problem seems to happen regularly, it would be helpful if the block processing code would detect that the last block is corrupted and do something about it.
2. Since it is the last block that is corrupted, there really isn't a need to re-index the entire chain. Recovering from a corrupted last block could only take a second.

If you are able to reproduce this and have the disk space, I'd be interested to see what's in your debug.log if you run bitcoind on a new datadir with --log-level=debug, maybe it's a bug in parsing that particular block in Core 0.17.0 that's causing the syncing process to stall (could be an infinite loop).

EDIT: disregard this post, I didn't realize this thread was 2 years old (but I'm interested in knowing if this problem exists in 0.20.1).

kalostrian

newbie

Activity: 11

Merit: 0

Problem here is that reindexing takes the same time as downloading the blocks.

So if that problem happens all the time this is not a solution, as reindexing from the begining takes hours...

jackg

copper member

Activity: 2856

Merit: 3071

https://bit.ly/387FXHi lightning theory

1. There’s probably been a reason they haven’t done that. I got that bug originally three years a go so it is in no way a new thing. I’m guessing it would take a long time to do it but I’m not particularly sure (as I’m it would make the sync process a lot slower or it’s difficult to do).

odolvlobo

legendary

Activity: 4298

Merit: 3209

Quote from: Rath_ on December 23, 2018, 04:10:05 PM

You have to delete that block manually. You won't have to re-download previous blocks. Stop your Bitcoin Core instance and open its data directory. Go to blocks folder and delete files associated with this block (blk.dat and rev.dat). A similar problem has been described here and it was answered by achow101 who is also a member of this forum.

I deleted the last blk.dat and rev.dat files and restarted. It re-indexed all the blocks and continued syncing and now I'm up-to-date. Thanks for the suggestion and the link.

I have some suggestions for any core developers that might read this:

1. Since this problem seems to happen regularly, it would be helpful if the block processing code would detect that the last block is corrupted and do something about it.
2. Since it is the last block that is corrupted, there really isn't a need to re-index the entire chain. Recovering from a corrupted last block could only take a second.

Quote from: Jet Cash on December 24, 2018, 02:34:54 AM

Rather than deleting the bad records, I would rename them. This means that if you have a bad spot on the disk, the software won't try to reuse it. All other actions should be as suggested.

Thanks for the suggestion, but I don't think that managing bad sectors by hand is practical. If you suspect that there is a bad sector, you should have the operating system check the disk.

Jet Cash

legendary

Activity: 2688

Merit: 2444

https://JetCash.com

Rather than deleting the bad records, I would rename them. This means that if you have a bad spot on the disk, the software won't try to reuse it. All other actions should be as suggested.

Rath_

legendary

Activity: 1876

Merit: 3131

You have to delete that block manually. You won't have to re-download previous blocks. Stop your Bitcoin Core instance and open its data directory. Go to blocks folder and delete files associated with this block (blk.dat and rev.dat). A similar problem has been described here and it was answered by achow101 who is also a member of this forum.

odolvlobo

legendary

Activity: 4298

Merit: 3209

My node refuses to sync beyond block 553342. I see this in the debug log:

Quote

2018-12-11T02:00:59Z InvalidChainFound: invalid block=0000000000000000001443924dba96339bfb0a06fb48ca8eb244c601a76a0e95 height=553343 log2_work=90.114118 date=2018-12-11T02:00:43Z

followed forever by this:

Quote

2018-12-11T02:00:59Z ERROR: AcceptBlockHeader: block 0000000000000000001443924dba96339bfb0a06fb48ca8eb244c601a76a0e95 is marked invalid

That block is height 553343 on the main chain according to blockchain.info.

I tried restarting Core, but no luck. The disk is nowhere close to being full.

Any suggestions?

Is there a way to unmark it as invalid? I hope I don't have to sync from the beginning.

Topic: Bitcoin Core 0.17.0 sync stuck at block 553342 (Read 348 times)