SIGSEGV in multithreaded app with OCI( on Linux

Question

I have got a SIGSEGV in OCI9. Application is multithreaded.
OS Linux. Distribution SLES8. Libc version 2.2.5.
Oracle 9.2.0.5
Application is heavy multithreaded. SIGSEGV occures very rarely. But always in the same place.
Connect code:
static void oracle_init() {
ILock l(m_env);
if (counter++ <= 0)
(void)OCIInitialize(OCI_DEFAULT, 0, NULL, NULL, NULL);
ctor {
oracle_init();
(void)OCIEnvInit(&env, OCI_DEFAULT, 0, NULL);
(void)OCIHandleAlloc(env, (void **)&err, OCI_HTYPE_ERROR, 0, NULL);
connect {
checkerr(err, OCILogon(env, err, &ctx, (text *)const_cast<char *>(user.c_str()), user.len(), (text *)const_cast<char *>(password.c_str()), pass
word.len(), (text *)const_cast<char *>(db.c_str()), db.len()));
/u/app/oracle/product/9.2.0/lib/libclntsh.so.9.0(nlolgobj+0x50f) [0x4044a22d]
/u/app/oracle/product/9.2.0/lib/libclntsh.so.9.0(nnfun2a+0x243) [0x403bc7e3]
/u/app/oracle/product/9.2.0/lib/libclntsh.so.9.0(nnfsn2a+0x66) [0x403bc310]
/u/app/oracle/product/9.2.0/lib/libclntsh.so.9.0(niqname+0x18a) [0x40365a1a]
/u/app/oracle/product/9.2.0/lib/libclntsh.so.9.0(kwfnran+0x11f) [0x402d5df7]
/u/app/oracle/product/9.2.0/lib/libclntsh.so.9.0(kwfcinit+0x177) [0x402a9155]
/u/app/oracle/product/9.2.0/lib/libclntsh.so.9.0(kpuatch+0x834) [0x4014f7d2]
/u/app/oracle/product/9.2.0/lib/libclntsh.so.9.0(kpulon+0x1bc) [0x4015009e]
/u/app/oracle/product/9.2.0/lib/libclntsh.so.9.0(OCILogon+0xd1) [0x401e2167]
Any ideas? Maybe I should initialise OCI with other flags?

Answer 1

OCIInitialize should be called with mode OCI_THREADED instead of OCI_DEFAULT.