Crash in __db_truncate_pp for a DS database in version 4.7.25

Question

My application creates a DS database (version 4.7.25). It is a single threaded application that reads/inserts records from/to this database.
This application is guarded by a heart-beating parent process that listens to SIGCHLD to re-start this process. There is also a mechanism to cleanly stop the parent and child processes. Both these tasks listen to SIGTERM signal to do cleanup and shutdown gracefully.
The requirement is to populate the database, periodically do a db->sync, continue using the data if crashed and restarted, but in case of a graceful shutdown and restart use a clean database. In the startup path, the application cannot determine whether it is started afresh for the first time or has restarted.
- Hence it tries to open the DB handle.
- If DB is already existing, run db->verify on this DB before accessing it.
- If task is gracefully shutting down, call a truncate on the DB (since this cannot be done at startup).
The truncate call fails and the application crashes with the following core
(gdb) bt
#0 0xfee11ce4 in __db_truncate_pp ()
from /export/home/myapp/3rdparty/bdb/libdb-4.7.so
The code fragment is simply as follows
if(dbase != NULL)
if((ret = dbase->truncate(dbase,NULL,(unsigned long*)count,0)) == 0)
return SUCCESS;
if(ret < 0)
fprintf(stderr,"DB-truncate failure error (BDB returnval: %d)\n", ret);
else
perror("truncate perror");
else
fprintf(stderr,"DB-truncate Invalid DB handle ...\n");
return FAILURE;
Is something missing out here ?
Regards,
Ravi Nathwani

Answer 1

Hello,
Is it possible to configure with:
enable-debug and enable-diagnostic
and get a complete stack trace, as that could
help identify what is going on a bit better.
Thanks,
Sandra