Ubuntu Hardy (8.0.4), Xen instance

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*** glibc detected *** /usr/bin/python: free(): invalid next size
(fast): 0x0000000000a3af60 ***
======= Backtrace: =========
/lib/libc.so.6[0x7f12dd00c08a]
/lib/libc.so.6(cfree+0x8c)[0x7f12dd00fc1c]
/usr/lib/python2.5/site-packages/psycopgmodule.so[0x7f12d8fc04ee]
/usr/bin/python(PyObject_Call+0x13)[0x417e33]
/usr/bin/python(PyEval_EvalFrameEx+0x4043)[0x487073]
/usr/bin/python(PyEval_EvalFrameEx+0x5bd7)[0x488c07]
/usr/bin/python(PyEval_EvalFrameEx+0x5bd7)[0x488c07]
/usr/bin/python(PyEval_EvalFrameEx+0x5bd7)[0x488c07]
/usr/bin/python(PyEval_EvalCodeEx+0x776)[0x48a406]
/usr/bin/python[0x4d528a]
/usr/bin/python(PyObject_Call+0x13)[0x417e33]
/usr/bin/python[0x41e66f]
/usr/bin/python(PyObject_Call+0x13)[0x417e33]
/usr/bin/python(PyEval_CallObjectWithKeywords+0x72)[0x482052]
/usr/bin/python(PyInstance_New+0x83)[0x422273]
/usr/bin/python(PyObject_Call+0x13)[0x417e33]
/usr/bin/python(PyEval_EvalFrameEx+0x314a)[0x48617a]
/usr/bin/python(PyEval_EvalCodeEx+0x776)[0x48a406]
/usr/bin/python(PyEval_EvalFrameEx+0x5045)[0x488075]
/usr/bin/python(PyEval_EvalFrameEx+0x5bd7)[0x488c07]
/usr/bin/python(PyEval_EvalFrameEx+0x5bd7)[0x488c07]
/usr/bin/python(PyEval_EvalFrameEx+0x5bd7)[0x488c07]
/usr/bin/python(PyEval_EvalFrameEx+0x5bd7)[0x488c07]
/usr/bin/python(PyEval_EvalFrameEx+0x5bd7)[0x488c07]
/usr/bin/python(PyEval_EvalCodeEx+0x776)[0x48a406]
/usr/bin/python(PyEval_EvalCode+0x32)[0x48a522]
/usr/bin/python(PyRun_FileExFlags+0x10e)[0x4abe2e]
/usr/bin/python(PyRun_SimpleFileExFlags+0x1a9)[0x4ac0c9]
/usr/bin/python(Py_Main+0x8fd)[0x4145ad]
/lib/libc.so.6(__libc_start_main+0xf4)[0x7f12dcfb61c4]
/usr/bin/python[0x413b29]
======= Memory map: ========
00400000-00522000 r-xp 00000000 08:01 1572901                          
 /usr/bin/python2.5
00721000-00753000 rw-p 00121000 08:01 1572901                          
 /usr/bin/python2.5
00753000-00b16000 rw-p 00753000 00:00 0                                
 [heap]
7f12d0000000-7f12d0021000 rw-p 7f12d0000000 00:00 0 
7f12d0021000-7f12d4000000 ---p 7f12d0021000 00:00 0 
7f12d62a9000-7f12d62b6000 r-xp 00000000 08:01 753810                   
 /lib/libgcc_s.so.1
7f12d62b6000-7f12d64b6000 ---p 0000d000 08:01 753810                   
 /lib/libgcc_s.so.1
7f12d64b6000-7f12d64b7000 rw-p 0000d000 08:01 753810                   
 /lib/libgcc_s.so.1
7f12d64b7000-7f12d64c1000 r-xp 00000000 08:01 756292                   
 /lib/libnss_nis-2.7.so
7f12d64c1000-7f12d66c0000 ---p 0000a000 08:01 756292                   
 /lib/libnss_nis-2.7.so
7f12d66c0000-7f12d66c2000 rw-p 00009000 08:01 756292                   
 /lib/libnss_nis-2.7.so
7f12d66c2000-7f12d66d8000 r-xp 00000000 08:01 756287                   
 /lib/libnsl-2.7.so
7f12d66d8000-7f12d68d7000 ---p 00016000 08:01 756287                   
 /lib/libnsl-2.7.so
7f12d68d7000-7f12d68d9000 rw-p 00015000 08:01 756287                   
 /lib/libnsl-2.7.so
7f12d68d9000-7f12d68db000 rw-p 7f12d68d9000 00:00 0 
7f12d68db000-7f12d68e3000 r-xp 00000000 08:01 756288                   
 /lib/libnss_compat-2.7.so
7f12d68e3000-7f12d6ae2000 ---p 00008000 08:01 756288                   
 /lib/libnss_compat-2.7.so
7f12d6ae2000-7f12d6ae4000 rw-p 00007000 08:01 756288                   
 /lib/libnss_compat-2.7.so
7f12d6ae4000-7f12d6aee000 r-xp 00000000 08:01 756290                   
 /lib/libnss_files-2.7.so
7f12d6aee000-7f12d6cee000 ---p 0000a000 08:01 756290                   
 /lib/libnss_files-2.7.so
7f12d6cee000-7f12d6cf0000 rw-p 0000a000 08:01 756290                   
 /lib/libnss_files-2.7.so
7f12d6cf0000-7f12d6d31000 rw-p 7f12d6cf0000 00:00 0 
7f12d6d31000-7f12d6d3e000 r-xp 00000000 08:01 1589759                  
 /usr/lib/python2.5/site-packages/mx/DateTime/mxDateTime/mxDateTime.so
7f12d6d3e000-7f12d6f3e000 ---p 0000d000 08:01 1589759                  
 /usr/lib/python2.5/site-packages/mx/DateTime/mxDateTime/mxDateTime.so
7f12d6f3e000-7f12d6f3f000 rw-p 0000d000 08:01 1589759                  
 /usr/lib/python2.5/site-packages/mx/DateTime/mxDateTime/mxDateTime.so
7f12d6f3f000-7f12d6f42000 r-xp 00000000 08:01 Aborted