"double free or corruption" when deleting HDF object

This happens *every* time an HDF is freed.  From within mod_python, it
crashes the Apache child process entirely :-(

lalo:/repo/www/newsite> python
Python 2.5 (r25:51908, Jan 12 2007, 14:52:36) 
[GCC 4.1.1] on linux2
Type "help", "copyright", "credits" or "license" for more information.
>>> import gc, neo_cgi
>>> from neo_util import HDF
>>> d = HDF()
>>> del d
*** glibc detected *** python: double free or corruption (out):
0x00002b9ce8e730d0 ***
======= Backtrace: =========
/lib/libc.so.6[0x2b9ce965b648]
/lib/libc.so.6(__libc_free+0x7b)[0x2b9ce965c91d]
/usr/lib/libpython2.5.so.1.0(PyDict_DelItem+0xf7)[0x2b9ce8f6be07]
/usr/lib/libpython2.5.so.1.0(PyEval_EvalFrameEx+0x38b8)[0x2b9ce8fb5b18]
/usr/lib/libpython2.5.so.1.0(PyEval_EvalCodeEx+0x603)[0x2b9ce8fb98f3]
/usr/lib/libpython2.5.so.1.0(PyEval_EvalCode+0x32)[0x2b9ce8fb9ba2]
/usr/lib/libpython2.5.so.1.0(PyRun_InteractiveOneFlags+0x1ba)[0x2b9ce8fdbf1a]
/usr/lib/libpython2.5.so.1.0(PyRun_InteractiveLoopFlags+0x4e)[0x2b9ce8fdc11e]
/usr/lib/libpython2.5.so.1.0(PyRun_AnyFileExFlags+0x4c)[0x2b9ce8fdc79c]
/usr/lib/libpython2.5.so.1.0(Py_Main+0x945)[0x2b9ce8fe4fb5]
/lib/libc.so.6(__libc_start_main+0x14b)[0x2b9ce961b44b]
python[0x4006f9]
======= Memory map: ========
00400000-00401000 r-xp 00000000 03:01 105472                         
   /usr/bin/python
00500000-00501000 rw-p 00000000 03:01 105472                         
   /usr/bin/python
00501000-005e1000 rw-p 00501000 00:00 0                              
   [heap]
2b9ce8de6000-2b9ce8dfd000 r-xp 00000000 03:01 481693                 
   /lib/ld-2.4.so
2b9ce8dfd000-2b9ce8e3f000 rw-p 2b9ce8dfd000 00:00 0 
2b9ce8e5f000-2b9ce8ea0000 rw-p 2b9ce8e5f000 00:00 0 
2b9ce8ec0000-2b9ce8ef1000 rw-p 2b9ce8ec0000 00:00 0 
2b9ce8efc000-2b9ce8efd000 r--p 00016000 03:01 481693                 
   /lib/ld-2.4.so
2b9ce8efd000-2b9ce8efe000 rw-p 00017000 03:01 481693                 
   /lib/ld-2.4.so
2b9ce8efe000-2b9ce902f000 r-xp 00000000 03:01 107917                 
   /usr/lib/libpython2.5.so.1.0
2b9ce902f000-2b9ce912e000 ---p 00131000 03:01 107917                 
   /usr/lib/libpython2.5.so.1.0
2b9ce912e000-2b9ce9162000 rw-p 00130000 03:01 107917                 
   /usr/lib/libpython2.5.so.1.0
2b9ce9162000-2b9ce916b000 rw-p 2b9ce9162000 00:00 0 
2b9ce916b000-2b9ce917b000 r-xp 00000000 03:01 481505                 
   /lib/libpthread-2.4.so
2b9ce917b000-2b9ce927a000 ---p 00010000 03:01 481505                 
   /lib/libpthread-2.4.so
2b9ce927a000-2b9ce927b000 r--p 0000f000 03:01 481505                 
   /lib/libpthread-2.4.so
2b9ce927b000-2b9ce927c000 rw-p 00010000 03:01 481505                 
   /lib/libpthread-2.4.so
2b9ce927c000-2b9ce9280000 rw-p 2b9ce927c000 00:00 0 
2b9ce9280000-2b9ce9282000 r-xp 00000000 03:01 17096                  
   /lib/libdl-2.4.so
2b9ce9282000-2b9ce9381000 ---p 00002000 03:01 17096                  
   /lib/libdl-2.4.so
2b9ce9381000-2b9ce9382000 r--p 00001000 03:01 17096                  
   /lib/libdl-2.4.so
2b9ce9382000-2b9ce9383000 rw-p 00002000 03:01 17096                  
   /lib/libdl-2.4.so
2b9ce9383000-2b9ce9385000 r-xp 00000000 03:01 481682                 
   /lib/libutil-2.4.so
2b9ce9385000-2b9ce9484000 ---p 00002000 03:01 481682                 
   /lib/libutil-2.4.so
2b9ce9484000-2b9ce9485000 r--p 00001000 03:01 481682                 
   /lib/libutil-2.4.so
2b9ce9485000-2b9ce9486000 rw-p 00002000 03:01 481682                 
   /lib/libutil-2.4.so
2b9ce9486000-2b9ce9487000 rw-p 2b9ce9486000 00:00 0 
2b9ce9487000-2b9ce94fd000 r-xp 00000000 03:01 17045                  
   /lib/libm-2.4.so
2b9ce94fd000-2b9ce95fc000 ---p 00076000 03:01 17045                  
   /lib/libm-2.4.so
2b9ce95fc000-2b9ce95fd000 r--p 00075000 03:01 17045                  
   /lib/libm-2.4.so
2b9ce95fd000-2b9ce95fe000 rw-p 00076000 03:01 17045                  
   /lib/libm-2.4.so
2b9ce95fe000-2b9ce96fc000 r-xp 00000000 03:01 16005                  
   /lib/libc-2.4.so
2b9ce96fc000-2b9ce97fc000 ---p 000fe000 03:01 16005                  
   /lib/libc-2.4.so
2b9ce97fc000-2b9ce9800000 r--p 000fe000 03:01 16005                  
   /lib/libc-2.4.so
2b9ce9800000-2b9ce9801000 rw-p 00102000 03:01 16005                  
   /lib/libc-2.4.so
2b9ce9801000-2b9ce9808000 rw-p 2b9ce9801000 00:00 0 
2b9ce9808000-2b9cec294000 r--p 00000000 03:01 850285                 
   /usr/lib/locale/locale-archive
2b9cec2b4000-2b9cec2f5000 rw-p 2b9cec2b
zsh: abort      python


I'm using AMD64 GNU/Linux, if that matters.