To try to solve this issue, I grabed the sources for PHP (5.3.2) and libiodbc (3.52.7). When ran under GDB, I can observe the following: odbc_exec() [PHP code] calls SQLAllocStmt() [libiodbc code], which calls some internal function that tries to call SQLAllocStmt(), in some indirect recursive way. As SQLAllocStmt() is protected by a mutex, there's a deadlock. The BT is as follows:
Probably best to ask on the php-internals list, they write the C code behind php so will be best able to help you.
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