Managed to reproduce it with debug symbols enabled, happened with both
python2.6 and 2.7, the following backtrace is from 2.7:

Program received signal SIGSEGV, Segmentation fault.
visit_decref.48740 (op=<unknown at remote 0xb88c90>, data=0x0) at 
../Modules/gcmodule.c:360
360     ../Modules/gcmodule.c: No such file or directory.
(gdb) bt
#0  visit_decref.48740 (op=<unknown at remote 0xb88c90>, data=0x0) at 
../Modules/gcmodule.c:360
#1  0x00000000004a43f8 in dict_traverse.18561 (op=
    {'bson.son': <module at remote 0xb0b478>, 'heapq': <module at remote 
0xb2c670>, 'functools': <module at remote 0x9d0360>, 'random': <module at 
remote 0xa7dec0>, '_bisect': <module at remote 0xb2c868>, 'datetime': <module 
at remote 0x7ffff7ed6ec0>, 'sysconfig': <module at remote 0x7ffff7f0e558>, 
'ctypes._endian': <module at remote 0xa7d440>, 'encodings.encodings': None, 
'pymongo.socket': None, 'pymongo.warnings': None, 'struct': <module at remote 
0x9c6248>, 'tempfile': <module at remote 0xa7d868>, 'base64': <module at remote 
0xbe6830>, 'collections': <module at remote 0xb2c3d0>, 'bson.time': None, 
'pymongo.connection': <module at remote 0x7ffff7ed6e50>, 'zipimport': <module 
at remote 0x7ffff7fcb9b8>, 'string': <module at remote 0xbe6440>, 
'encodings.utf_8': <module at remote 0x7ffff7ecea28>, 'ssl': <module at remote 
0xbd6638>, 'pymongo.replica_set_connection': <module at remote 0xc05ef8>, 
'pymongo.struct': None, 'ctypes.os': None, 'bisect': <module at remote 
0xb2c830>, 'signal': <module at remote 0x7ffff7fcba6...(truncated), 
    visit=0x4a4520 <visit_decref.48740>, arg=0x0) at 
../Objects/dictobject.c:2113
#2  0x00000000004adf95 in collect.48871 (generation=2) at 
../Modules/gcmodule.c:385
#3  0x000000000042ead2 in PyGC_Collect () at ../Modules/gcmodule.c:1440
#4  0x00000000004345ad in Py_Finalize () at ../Python/pythonrun.c:444
#5  0x000000000044b6a4 in Py_Main (argc=<optimized out>, argv=0x7fffffffd048) 
at ../Modules/main.c:664
#6  0x00007ffff6fb8ead in __libc_start_main (main=<optimized out>, 
argc=<optimized out>, ubp_av=<optimized out>, init=<optimized out>, 
    fini=<optimized out>, rtld_fini=<optimized out>, stack_end=0x7fffffffd038) 
at libc-start.c:228
#7  0x00000000004c8d81 in _start ()
(gdb) 

This was the result of a simple import pymongo.

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