Crash of moned fixing pruned blockchain

[Liger0]

Hi, at some point the download of my pruned blockchain got corrupted because the pc got restarted while synching. I used the command --prune-blockchain --db-salvage in the gui as flag and also tried to salvage by command prompt, but while starting the node monerod.exe reports a crash.

[selsta]

You most likely have to resync from scratch.

[Liger0]

It's the fourth time I try to resynch from 0, everytime it reaches 60% it freezes, the gui keeps saying "resynching", and the blockchain isn't updated anymore. I click "stop daemon" but it never does so. Even closing the wallet doesn't work at that point and I am forced to kill the process.

[Liger0]

I tried to resync yet again. After 3 days it was near its end with some hours remaining, the file was over 30GB. I had to restart the PC, so I stopped the daemon by the gui correctly and closed the program. I noticed my system was still sluggish, after 10 minutes my hard disk still reported 100% of my hdd writing bandwidth was used, even though the gui was totally closed.

I restarted the PC, and the blockchain is corrupted again. It's ridiculous...

[selsta]

There is something wrong with your system, hard drive, setup, or there is a bug. A corruption is rare, having it corrupt 5 times is not normal.

In general an SSD is recommended, but it also works on HDD.

Note that you can add --db-sync-mode safe it will avoid the blockchain from corrupting but it will result in slower sync. Alternatively you can simply use a remote node.

[Liger0]

It seems it keeps writing on the hdd after closing the daemon and the gui, I also found other claims that the blockchain gets corrupted when interrupting if it's synched with the pruning option. The log's this:

`2021-07-24 21:05:47.766 [P2P6] INFO global src/cryptonote_protocol/cryptonote_protocol_handler.inl:1680 Synced 2343532/2412008 (97%, 68476 left, 40% of total synced, estimated 22.1 hours left)

2021-07-24 21:06:13.720 [P2P6] INFO global src/cryptonote_protocol/cryptonote_protocol_handler.inl:1680 Synced 2343552/2412008 (97%, 68456 left)

2021-07-24 21:06:20.278 [SRV_MAIN] INFO global src/daemon/p2p.h:80 p2p net loop stopped

2021-07-24 21:06:20.458 [SRV_MAIN] INFO global src/daemon/rpc.h:84 Stopping core RPC server...

2021-07-24 21:06:20.474 [SRV_MAIN] INFO global src/daemon/daemon.cpp:227 Node stopped.

2021-07-24 21:06:20.487 [SRV_MAIN] INFO global src/daemon/rpc.h:96 Deinitializing core RPC server...

2021-07-24 21:06:20.515 [SRV_MAIN] INFO global src/daemon/p2p.h:90 Deinitializing p2p...

2021-07-24 21:06:32.904 [SRV_MAIN] INFO global src/daemon/core.h:94 Deinitializing core...

2021-07-24 21:50:49.629 11804 INFO logging contrib/epee/src/mlog.cpp:273 New log categories: *:WARNING,net:FATAL,net.http:FATAL,net.ssl:FATAL,net.p2p:FATAL,net.cn:FATAL,daemon.rpc:FATAL,global:INFO,verify:FATAL,serialization:FATAL,daemon.rpc.payment:ERROR,stacktrace:INFO,logging:INFO,msgwriter:INFO

2021-07-24 21:50:49.658 11804 INFO global src/daemon/main.cpp:294 Monero 'Oxygen Orion' (v0.17.2.0-release)

2021-07-24 21:50:49.660 11804 INFO global src/daemon/protocol.h:53 Initializing cryptonote protocol...

2021-07-24 21:50:49.661 11804 INFO global src/daemon/protocol.h:58 Cryptonote protocol initialized OK

2021-07-24 21:50:49.662 11804 INFO global src/daemon/core.h:63 Initializing core...

2021-07-24 21:50:49.708 11804 INFO global src/cryptonote_core/cryptonote_core.cpp:515 Loading blockchain from folder E:\Monero storage\bitmonero (pruned blockchain)\lmdb ...

2021-07-24 21:51:25.764 11804 ERROR cn src/cryptonote_basic/cryptonote_format_utils.cpp:1345 Failed to parse block from blob

2021-07-24 21:51:25.900 11804 INFO global src/daemon/protocol.h:75 Stopping cryptonote protocol...

2021-07-24 21:51:25.918 11804 INFO global src/daemon/protocol.h:79 Cryptonote protocol stopped successfully

2021-07-24 21:51:25.919 11804 ERROR daemon src/daemon/main.cpp:362 Exception in main! Failed to parse block from blob retrieved from the db

2021-07-24 21:57:19.452 10992 INFO logging contrib/epee/src/mlog.cpp:273 New log categories: *:WARNING,net:FATAL,net.http:FATAL,net.ssl:FATAL,net.p2p:FATAL,net.cn:FATAL,daemon.rpc:FATAL,global:INFO,verify:FATAL,serialization:FATAL,daemon.rpc.payment:ERROR,stacktrace:INFO,logging:INFO,msgwriter:INFO

2021-07-24 21:57:19.453 10992 INFO global src/daemon/main.cpp:294 Monero 'Oxygen Orion' (v0.17.2.0-release)

2021-07-24 21:57:19.454 10992 INFO global src/daemon/protocol.h:53 Initializing cryptonote protocol...

2021-07-24 21:57:19.455 10992 INFO global src/daemon/protocol.h:58 Cryptonote protocol initialized OK

2021-07-24 21:57:19.457 10992 INFO global src/daemon/core.h:63 Initializing core...

2021-07-24 21:57:19.458 10992 INFO global src/cryptonote_core/cryptonote_core.cpp:515 Loading blockchain from folder E:\Monero storage\bitmonero (pruned blockchain)\lmdb ...

2021-07-24 21:57:19.513 10992 ERROR cn src/cryptonote_basic/cryptonote_format_utils.cpp:1345 Failed to parse block from blob

2021-07-24 21:57:19.932 10992 INFO global src/daemon/protocol.h:75 Stopping cryptonote protocol...

2021-07-24 21:57:19.932 10992 INFO global src/daemon/protocol.h:79 Cryptonote protocol stopped successfully

2021-07-24 21:57:19.933 10992 ERROR daemon src/daemon/main.cpp:362 Exception in main! Failed to parse block from blob retrieved from the db `

[Liger0]

There is something wrong with your system, hard drive, setup, or there is a bug. A corruption is rare, having it corrupt 5 times is not normal.

In general an SSD is recommended, but it also works on HDD.

Note that you can add --db-sync-mode safe it will avoid the blockchain from corrupting but it will result in slower sync. Alternatively you can simply use a remote node.

I downloaded the entire raw blockchain from getmonero. When it ended the import, it gave the following error

I again tried to repair it, but monerod crashes.

[selsta]

I'm closing this here as it seems to be a daemon bug and not a GUI bug. I would recommend to either try a different computer / hard drive or use a remote node.