mythbackend segfault

[Free Denizen <freedenizen@…>]

I'm not sure of the trigger for the crash, it seems to happen randomly, but it does not occur when running under gdb. Attaching backtrace from a core dump. Running trunk rev 26497 The only thing I see in the logs are:

*** glibc detected *** /usr/local/bin/mythbackend: corrupted double-linked list: 0xa5e19e10 ***
======= Backtrace: =========
/lib/libc.so.6(+0x6c534)[0xb49e6534]
/lib/libc.so.6(+0x6ca92)[0xb49e6a92]
/lib/libc.so.6(+0x6eab6)[0xb49e8ab6]
/lib/libc.so.6(__libc_malloc+0x5e)[0xb49eae5e]
/usr/lib/qt4/libQtCore.so.4(_Z7qMallocj+0x1e)[0xb4d46634]
/usr/lib/qt4/libQtCore.so.4(_ZN7QString17fromLatin1_helperEPKci+0x3f)[0xb4d91689]
/usr/lib/qt4/libQtCore.so.4(_ZN7QString16fromAscii_helperEPKci+0xd9)[0xb4d9833b]
/usr/local/bin/mythbackend(_ZN7QStringC1EPKc+0x19)[0x807f317]
/usr/local/lib/libmythupnp-0.24.so.0(_ZN4SSDP11ProcessDataEP13MSocketDevice+0xcb)[0xb6934741]
/usr/local/lib/libmythupnp-0.24.so.0(_ZN4SSDP3runEv+0x1ea)[0xb69356a8]
/usr/lib/qt4/libQtCore.so.4(+0x637b5)[0xb4d4b7b5]
/lib/libpthread.so.0(+0x666f)[0xb4be266f]
/lib/libc.so.6(clone+0x5e)[0xb4a4b95e]

Followed by the memory map, please let me know if that would be useful to attach. I'm also seeing previewgen segfaulting as well. It is possible that this is just an error on my machine but if so I've been unable to locate the cause.