UMR with PURIFY

Question

Hi All,
I am using a multi-threaded application to execute database
queries. The Oracle version in use is 9.0.1.0.0 on Sun Solaris
platform. A single environment handle along with connection
pooling is used.
I am running the application with PURIFY and have a couple
of questions :
1. When I run the application with PURIFY, I get many UMR's
(Uninitialized Memory Reads) in OCI system calls like
OCIEnvCreate and OCIConnectionPoolCreate (a couple are shown
below). Are these known issues in OCI, or is it something to
do with our usage of the OCI system calls in our application :
UMR: Uninitialized memory read
This is occurring while in:
LdiDateRoundFS [ldirfs.c]
LdiDateConstruct [ldidcon.c]
sLdiGetDate [sldiget.c]
kpu_get_ldi_ostz [kpuzln.c]
kpuinit0 [kpuini.c]
kpuenvcr [kpuini.c]
OCIEnvCreate [oci8.c]
=> (void)OCIEnvCreate((OCIEnv **)&(this->pEnvHandle), (ub4)(OCI_DEFAULT),\
(dvoid*)0,NULL,NULL,NULL,\
(size_t)0, (dvoid **)0);
UMR: Uninitialized memory read
This is occurring while in:
nlnvews [nlnv.c]
nlnvmsc [nlnv.c]
nlnvpds [nlnv.c]
nlnvcrb [nlnv.c]
nlnvcpb [nlnvcpb.c]
nlnvibb [nlnvibb.c]
nlad_use_node [nlad.c]
nscall1 [nscall.c]
nscall [nscall.c]
niotns [nio.c]
nigcall [nig.c]
osncon [nigcon.c]
kpuadef [kpu.c]
upiini [upiprv.c]
upiah0 [upicdc.c]
kpuatch [kpu.c]
kpucpcrecons [kpucp.c]
kpucpcreate [kpucp.c]
OCIConnectionPoolCreate [oci8.c]
     retStatus = OCIConnectionPoolCreate((this->pEnvHandle),\
pErrorHandle, (this->pCPoolHandle), &(this->pPoolName),\
&(this->dPoolNameLen), this->pDatabase, \
(sb4)strlen((const char *)this->pDatabase), 1,\
this->dTotalConn, 1, (text*)this->pDbUserName,\
(sb4)strlen((const char*)this->pDbUserName),\
(text*)this->pDbPasswd, (sb4)strlen(\
(const char*)this->pDbPasswd), OCI_DEFAULT);
2. I also get a memory dump/core dump in OCI system calls
(OCILogOff(), OCIStmtExecute()) after some time when I run
multiple simultaneous queries. The dump is shown below.
Are there some memory space initializations that need to be
done when initializing OCI/PURIFY for this ?
********** Internal heap ERROR 17112 addr=0x4d998c *********
***** Dump of memory around addr 4d998c:
4D9780 00000000 [....]
4D9790 00000000 00000000 00000000 00000000 [................]
Repeat 2 times
4D97C0 00000000 00000000 00000000 00069DE4 [................]
4D97D0 FED147B8 FEDD5114 FCBCE788 FCBD93D4 [..G...Q.........]
4D97E0 FCE7D960 FCE84118 FCE86F14 FDDB8F10 [...`..A...o.....]
Chunk 546f18 sz= 4144 free " "
Chunk 55a2d8 sz= 4144 free " "
Total free space = 729940
UNPINNED RECREATABLE CHUNKS (lru first):
PERMANENT CHUNKS:
Chunk 573f00 sz= 76 perm "perm " alo=76
Permanent space = 76
Hla: 0
Thanks in advance for any help
Subhash Nayak.

Answer 1

Hello,
I found also a lot of UMR when I purified it on HP-UX. Looks like they don't hurt.
But your application should not crash. AFAICS you didn't initialize OCI in threaded mode, thats might be the cause for the crash.
Regards,
Kai