Memory Pool Error/s with VxWorks

Hi,
I am running Berkeley DB under vxWorks and am encountering memory pool errors. The version we are using is 4.5.20, and we are building a "Concurrent Data Store Application" (small footprint, MIPS64gnu).
The environment flags are set as follows:
(DB_INIT_CDB | DB_INIT_MPOOL | DB_CREATE | DB_SYSTEM_MEM)
The cache size is set to 1MB.
I believe I have found the offending routine. It is __db_tmp_open in db-4.5.20\env\env_open.c.
Initially I was receiving the following error:
db_starchoice: unable to create temporary backing file
db_starchoice: temporary open: /ata00/oracle/temp/BDB0-*/*: S_dosFsLib_ILLEGAL_N
AME
So, I modified the above mentioned routine to generate a legal file name. At which point the file name became:
/ata00/oracle/temp/BDB87bc4940
87bc4940 is the PID in hex.
I am no longer told that the file name is illegal, however, an exception is thrown with the following trace:
800a5bdc vxTaskEntry +c : excTask (0, 0, 0, 0)
8014dca8 excTask +b8 : sigPendKill (eeeeeeee, eeeeeeee, eeeeeeee, eeeeeee
e)
80159c28 sigPendKill +118: 801592b8 (eeeeeeee, 8014dcb0, 0, 0)
80159300 sigPendDestroy +248: sigismember (0, 0, 0, 7400ff01)
Do I have some configuration incorrect? Is there a known problem with this code, for which I am unable to find reference to?
Thx,
Coralie

I have more information about this problem.
If I "disable" the routine __os_zerofill() in os_fzero.c, by having it always return (0), I no longer get an exception and my application appears to run smoothly. However, I have not determined what in this routine leads to the exception. And, I have no idea what the short and long term consequences of "disabling" this routine will be....
-Coralie

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