[PyQt] memory corruption

[lucaberto at libero.it]

hello i have made a little software for xdcc transfer via irc i use thread, sometimes all works good and other times i get this error:

*** glibc detected *** ./main: malloc(): memory corruption: 0xb55c72c0 ***
======= Backtrace: =========
/lib/libc.so.6[0xb7e7afc4]
/lib/libc.so.6[0xb7e7d6aa]
/lib/libc.so.6(__libc_malloc+0x9c)[0xb7e7f11c]
./main(PyObject_Malloc+0xe0)[0x8082bf0]
./main(PyString_FromStringAndSize+0xa8)[0x8089b68]
/tmp/_MEI28650/PyQt4.QtNetwork.so[0xb663eeef]
./main(PyCFunction_Call+0x18d)[0x81050fd]
./main(PyEval_EvalFrameEx+0x5a49)[0x80b8319]
./main(PyEval_EvalCodeEx+0x6ad)[0x80b9b6d]
./main[0x81040ca]
./main(PyObject_Call+0x37)[0x805bd97]
./main[0x8061aa8]
./main(PyObject_Call+0x37)[0x805bd97]
./main(PyEval_CallObjectWithKeywords+0x7c)[0x80b1c2c]
/tmp/_MEI28650/sip.so[0xb6b8d2d3]
/tmp/_MEI28650/PyQt4.QtCore.so[0xb66d598d]
/tmp/_MEI28650/PyQt4.QtCore.so[0xb67095a6]
/usr/lib/libQtCore.so.4[0xb6be29b7]
/lib/libpthread.so.0[0xb7f9a175]
/lib/libc.so.6(clone+0x5e)[0xb7edcdce]

You can give me some ideas, if you need the source i will send

Thanks Luca