DB_RUNRECOVERY: Fatal error #316

Generate databases in .bitcoin with bitcoin 0.3.20 (as is available in the bitcoind package in debian squeeze). Close that server down, then run the 0.3.23-rc1 (or beta), and you get the following:

************************
EXCEPTION: 22DbRunRecoveryException       
DbEnv::open: DB_RUNRECOVERY: Fatal error, run database recovery       
bitcoin in AppInit()       



************************
EXCEPTION: 22DbRunRecoveryException       
DbEnv::open: DB_RUNRECOVERY: Fatal error, run database recovery       
bitcoin in CMyApp::OnUnhandledException()       

terminate called after throwing an instance of 'DbRunRecoveryException'
  what():  DbEnv::open: DB_RUNRECOVERY: Fatal error, run database recovery
Aborted

I tried db4.7_recover and db4.8_recover, as well as corresponding dump programs, and none were able to parse my blk0001.dat file. So, I think this is the culprit, but I'm not sure where to begin. It's pretty easy to reproduce this problem, though.

blk0001.dat is not a BDB file, but a raw concatenation of bitcoin blocks.

Sounds like the debian squeeze is compiled against berkeley db 4.8; the fix is to get rid of the __db* database/ and log_* files (the .dat files are compatible between bdb 4.7 and 4.8)