this is not a ipython issue, but help(), modules attempts to import all modules 
and crashes in one of them.
for me it crashes in python-apt:

gdb /usr/bin/python-dbg
(gdb) r
>> help()
>>> modules
Program received signal SIGSEGV, Segmentation fault.
(gdb) bt
#0  0x0000000000018236 in ?? ()
#1  0x00007fffefd006e1 in initapt_pkg () from 
/usr/lib/python2.7/dist-packages/apt_pkg.so
#2  0x000000000054778d in _PyImport_LoadDynamicModule (name=0x7fffffff5794 
"apt_pkg", pathname=
    0x7fffffff46a0 "/usr/lib/python2.7/dist-packages/apt_pkg.so", fp=0x266f200)
    at ../Python/importdl.c:53
#3  0x0000000000543734 in load_module (name=0x7fffffff5794 "apt_pkg", 
fp=0x266f200, pathname=
    0x7fffffff46a0 "/usr/lib/python2.7/dist-packages/apt_pkg.so", type=3, 
loader=0x0)
    at ../Python/import.c:1834
#4  0x0000000000545940 in import_submodule (mod=None, subname=0x7fffffff5794 
"apt_pkg", fullname=
    0x7fffffff5794 "apt_pkg") at ../Python/import.c:2596


** Package changed: ipython (Ubuntu) => python-apt (Ubuntu)

** Changed in: python-apt (Ubuntu)
       Status: New => Confirmed

** Summary changed:

- ipython crashed with SIGSEGV in __find_specmb()
+ help() modules crashes with SIGSEGV in apt_pkg.so

** Visibility changed to: Public

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https://bugs.launchpad.net/bugs/905577

Title:
  help() modules crashes with SIGSEGV in apt_pkg.so

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