mempool transaction missing input

[gavinandresen]

I've got a testnet wallet that causes this assertion failure when I turn on CPU mining:

Assertion failed: ("mempool transaction missing input" == 0), function CreateNewBlock, file main.cpp, line 4233.

I'm guessing it is a no-longer-valid-because-of-a-re-org transaction, but the wallet code shouldn't be adding invalid transactions to the memory pool.

[jgarzik]

I think that's always been an artifact. I bet reorg behaves the same way.

[sipa]

It has always been the case, until 0.8 (see 231b399). If it still happens, there is a bug.

[sipa]

@gavinandresen Why do you assume it's caused by the wallet code? (not saying you're wrong, just wondering whether some information is missing here)

[gavinandresen]

I think it is the wallet code because it happens immediately after a fresh, clean start, so I assume an unconfirmed transaction in the wallet is getting added to the memory pool (it isn't a weird edge case during re-orgs or something).

Let me know if you have debugging bandwidth, I'll send you the wallet.

[Krellan]

I'm running Bitcoin-Qt version v0.8.2.2-g09e437b-beta

Not sure if this has been fixed in the latest release, but this happened to me. It was just running in the background, scrolling debug messages in a window, when it crashed, with this error:

sending: inv (37 bytes)
received: inv (37 bytes)
  got inventory: tx c140253a4aeab6e4db5bdbd6c0a1d7d240490c241d86d01a819d5c9f16eb22fd  have
received: inv (37 bytes)
  got inventory: tx c140253a4aeab6e4db5bdbd6c0a1d7d240490c241d86d01a819d5c9f16eb22fd  have
sending: inv (397 bytes)
ERROR: mempool transaction missing input
bitcoin-qt: src/main.cpp:4241: CBlockTemplate* CreateNewBlock(CReserveKey&): Assertion `"mempool transaction missing input" == 0' failed.

I then restarted Bitcoin manually, and all seemed well.

[sipa]

Should be fixed in head by #2769.