[Harbour] Are there MT issues in contrib/hbpgsql?

[Lorenzo Fiorini]

Continuing in my MT path this is what I get from code that work since years ST:

double free or corruption (!prev): 0x0a05bd48 ***
======= Backtrace: =========
/lib/tls/i686/cmov/libc.so.6[0xb7a89604]
/lib/tls/i686/cmov/libc.so.6(cfree+0x96)[0xb7a8b5b6]
/usr/lib/libpq.so.5(PQclear+0x30)[0xb7b88420]
/usr/lib/libpq.so.5[0xb7b8849c]
/usr/lib/libpq.so.5[0xb7b8ae52]
/usr/lib/libpq.so.5[0xb7b932dd]
/usr/lib/libpq.so.5[0xb7b89288]
/usr/lib/libpq.so.5(PQgetResult+0xb1)[0xb7b8af51]
/usr/lib/libpq.so.5[0xb7b8b163]
/opt/harbour/lib/libhbpgsql.so(HB_FUN_PQEXEC+0x70)[0xb7ba5120]
/opt/harbour/lib/libharbourmt.so(hb_vmProc+0x4a)[0xb7d4ae3a]
/opt/harbour/lib/libharbourmt.so(hb_vmExecute+0x2626)[0xb7d1cdd6]
/opt/harbour/lib/libhbpgsql.so[0xb7ba2c4a]
/opt/harbour/lib/libharbourmt.so(hb_vmSend+0x82)[0xb7d20082]

Where should I start to look?

best regards,
Lorenzo