[pybsddb] DB read problem from thread

anurag uniyal anuraguniyal at yahoo.com
Tue Apr 1 06:13:36 CEST 2008

In my application I am trying to access(read) a DB thru a thread while my main thread is adding data to it and it gives following error(s)

bsddb._db.DBRunRecoveryError: (-30974, 'DB_RUNRECOVERY: Fatal error, run database recovery -- PANIC: Permission denied')

and sometimes
bsddb._db.DBRunRecoveryError: (-30974, 'DB_RUNRECOVERY: Fatal error, run database recovery -- PANIC: fatal region error detected; run recovery')

bsddb._db.DBInvalidArgError: (22, 'Invalid argument -- DB_LOCK->lock_put: Lock is no longer valid')

sometimes pure seg fault.
Program received signal SIGSEGV, Segmentation fault.
0xb7c1b845 in __bam_adjust () from /usr/lib/libdb-4.4.so

and some time memory usage keeps on increasing and cpu is 100%
it crashes with memory error.

This doesn't happen always, almost 1 in 10 cases.
If i use simple python threaded function instead of threading class, it works.

I have attached a simple script which tries to replicate the scenario.

Do anybody has a clue what I am doing wrong here?
I suppose bsddb3 DB can be accessed from mutiple threads? 
or do I need to specifically set DB_THREAD flag? though with db.DB_THREAD it hangs on some mutex?

Thanks a lot

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