Hi Jun'ichi, Which are libvirt version and OS you're using? I also found a leak of XMLDesc() via valgrind, I think the generator should fix this, but you may wait for developers reply, thanks for reporting this. <valgrind> ==14265== 2,407 bytes in 1 blocks are definitely lost in loss record 1,457 of 1,550 ==14265== at 0x4C2845D: malloc (in /usr/lib64/valgrind/vgpreload_memcheck-amd64-linux.so) ==14265== by 0x5C46624: xdr_string (in /usr/lib64/libc-2.17.so) ==14265== by 0xCFD9FCD: xdr_remote_nonnull_string (remote_protocol.c:31) ==14265== by 0xCFDC2C8: xdr_remote_domain_get_xml_desc_ret (remote_protocol.c:1617) ==14265== by 0xCFF0811: virNetMessageDecodePayload (virnetmessage.c:407) ==14265== by 0xCFE68FB: virNetClientProgramCall (virnetclientprogram.c:379) ==14265== by 0xCFBE8B1: callFull.isra.2 (remote_driver.c:6578) ==14265== by 0xCFC7F04: remoteDomainGetXMLDesc (remote_driver.c:6600) ==14265== by 0xCF8167C: virDomainGetXMLDesc (libvirt.c:4380) ==14265== by 0xCC2C4DF: libvirt_virDomainGetXMLDesc (libvirt.c:1141) ==14265== by 0x4F12B93: PyEval_EvalFrameEx (in /usr/lib64/libpython2.7.so.1.0) ==14265== by 0x4F141AC: PyEval_EvalCodeEx (in /usr/lib64/libpython2.7.so.1.0) </valgrind> -- Regards, Alex ----- Original Message ----- From: "Junichi Nomura" <j-nomura(a)ce.jp.nec.com&gt; To: libvir-list(a)redhat.com Sent: Friday, September 12, 2014 2:56:10 PM Subject: [libvirt] libvirt-python: memory leak after GetXMLDesc? Hello, I've observed memory leak in long-running python program and suspects a bug in libvirt-python. libvirt-python contains auto-generated code like this: libvirt_virDomainGetXMLDesc(...) { ... LIBVIRT_BEGIN_ALLOW_THREADS; c_retval = virDomainGetXMLDesc(domain, flags); LIBVIRT_END_ALLOW_THREADS; py_retval = libvirt_charPtrWrap((char *) c_retval); return py_retval; } virDomainGetXMLDesc() expects the caller to free c_retval. Though it used to be freed in libvirt_charPtrWrap(), commit bb3301ba ("Don't free passed in args in libvirt_charPtrWrap / libvirt_charPtrSizeWrap") has moved the responsibility to the outside. So, it seems either GetXMLDesc should not depend on auto-generation or the generator should be fixed. Any comments? -- Jun'ichi Nomura, NEC Corporation -- libvir-list mailing list libvir-list(a)redhat.com https://www.redhat.com/mailman/listinfo/libvir-list

On 12.09.2014 08:56, Junichi Nomura wrote: Yes, this is a libvirt-python bug. And it's there since 1.2.1! We need to fix our generator. Patch on way. Michal