title: Segmentation Fault in Pandas read_csv
body: <p>I have Python 2.7.5 on Os X 10.9 with Pandas version 0.12.0-943-gaef5061.  When I download <a href="http://www.kaggle.com/c/crowdflower-weather-twitter/download/train.csv" rel="noreferrer">this train.csv file</a> and run read_csv, I get Segmentation Fault 11.  I have experimented with the file encoding, putting values in the empty columns, and changing the options for quotes, but to no avail.  From the error report, it looks as if the fault may be occurring in <code>unmath.so</code>.</p>
  
  <p>Does anyone have an explanation or workaround?</p>
  
  <pre><code>Python 2.7.5 (default, Aug 25 2013, 00:04:04) 
  [GCC 4.2.1 Compatible Apple LLVM 5.0 (clang-500.0.68)] on darwin
  Type "help", "copyright", "credits" or "license" for more information.
  &gt;&gt;&gt; import pandas
  &gt;&gt;&gt; pandas.read_csv('train.csv')
  Segmentation fault: 11
  </code></pre>
  
  <p>More information from the error report:</p>
  
  <pre><code>Process:         Python [5400]
  Path:            /System/Library/Frameworks/Python.framework/Versions/2.7/Resources/Python.app/Contents/MacOS/Python
  Identifier:      Python
  Version:         2.7.5 (2.7.5)
  Code Type:       X86-64 (Native)
  Parent Process:  bash [4823]
  Responsible:     Terminal [321]
  User ID:         501
  
  PlugIn Path:       /Library/Python/2.7/site-packages/numpy-1.9.0.dev_54d3559-py2.7-macosx-10.9-intel.egg/numpy/core/umath.so
  PlugIn Identifier: umath.so
  PlugIn Version:    ??? (0)
  
  Date/Time:       2013-10-26 09:02:45.350 -0700
  OS Version:      Mac OS X 10.9 (13A603)
  Report Version:  11
  Anonymous UUID:  CAE885D2-2BCB-60AF-9133-E06FE6DD85A9
  
  Sleep/Wake UUID: 2B9C017B-5FE4-4EA0-A2DF-EB279848BED9
  
  Crashed Thread:  0  Dispatch queue: com.apple.main-thread
  
  Exception Type:  EXC_BAD_ACCESS (SIGSEGV)
  Exception Codes: KERN_INVALID_ADDRESS at 0x0000000000000000
  
  VM Regions Near 0:
  --&gt; 
  __TEXT                 0000000109030000-0000000109031000 [    4K] r-x/rwx SM=COW  /System/Library/Frameworks/Python.framework/Versions/2.7/Resources/Python.app/Contents/MacOS/Python
  
  Thread 0 Crashed:: Dispatch queue: com.apple.main-thread
  0   umath.so                        0x0000000109563567 _extract_pyvals + 403
  1   umath.so                        0x0000000109565ea4 _get_bufsize_errmask + 49
  2   umath.so                        0x0000000109563ad4 PyUFunc_GenericFunction + 1181    
  3   umath.so                        0x00000001095677b7 ufunc_generic_call + 307
  4   org.python.python               0x000000010903ef72 PyObject_Call + 101
  5   org.python.python               0x00000001090b8df5 PyEval_EvalFrameEx + 15416
  6   org.python.python               0x00000001090bb864 0x109035000 + 551012
  7   org.python.python               0x00000001090b84d4 PyEval_EvalFrameEx + 13079
  8   org.python.python               0x00000001090bb864 0x109035000 + 551012
  9   org.python.python               0x00000001090b84d4 PyEval_EvalFrameEx + 13079
  10  org.python.python               0x00000001090bb864 0x109035000 + 551012
  11  org.python.python               0x00000001090b84d4 PyEval_EvalFrameEx + 13079
  12  org.python.python               0x00000001090bb864 0x109035000 + 551012
  13  org.python.python               0x00000001090b84d4 PyEval_EvalFrameEx + 13079
  14  org.python.python               0x00000001090b5093 PyEval_EvalCodeEx + 1641
  15  org.python.python               0x000000010905c796 0x109035000 + 161686
  16  org.python.python               0x000000010903ef72 PyObject_Call + 101
  17  org.python.python               0x00000001090499a7 0x109035000 + 84391
  18  org.python.python               0x000000010903ef72 PyObject_Call + 101
  19  org.python.python               0x00000001090b8df5 PyEval_EvalFrameEx + 15416
  20  org.python.python               0x00000001090b5093 PyEval_EvalCodeEx + 1641
  21  org.python.python               0x00000001090bb8c8 0x109035000 + 551112
  22  org.python.python               0x00000001090b84d4 PyEval_EvalFrameEx + 13079
  23  org.python.python               0x00000001090b5093 PyEval_EvalCodeEx + 1641
  24  org.python.python               0x000000010905c796 0x109035000 + 161686
  25  org.python.python               0x000000010903ef72 PyObject_Call + 101
  26  org.python.python               0x00000001090499a7 0x109035000 + 84391
  27  org.python.python               0x000000010903ef72 PyObject_Call + 101
  28  org.python.python               0x00000001090b8df5 PyEval_EvalFrameEx + 15416
  29  org.python.python               0x00000001090b5093 PyEval_EvalCodeEx + 1641
  30  org.python.python               0x00000001090bb8c8 0x109035000 + 551112
  31  org.python.python               0x00000001090b84d4 PyEval_EvalFrameEx + 13079
  32  org.python.python               0x00000001090b5093 PyEval_EvalCodeEx + 1641
  33  org.python.python               0x00000001090bb8c8 0x109035000 + 551112
  34  org.python.python               0x00000001090b84d4 PyEval_EvalFrameEx + 13079
  35  org.python.python               0x00000001090bb864 0x109035000 + 551012
  36  org.python.python               0x00000001090b84d4 PyEval_EvalFrameEx + 13079
  37  org.python.python               0x00000001090bb864 0x109035000 + 551012
  38  org.python.python               0x00000001090b84d4 PyEval_EvalFrameEx + 13079
  39  org.python.python               0x00000001090b5093 PyEval_EvalCodeEx + 1641
  40  org.python.python               0x000000010905c796 0x109035000 + 161686
  41  org.python.python               0x000000010903ef72 PyObject_Call + 101
  42  org.python.python               0x00000001090499a7 0x109035000 + 84391
  43  org.python.python               0x000000010903ef72 PyObject_Call + 101
  44  org.python.python               0x00000001090bb01f PyEval_CallObjectWithKeywords + 93
  45  org.python.python               0x0000000109083d09 0x109035000 + 322825
  46  org.python.python               0x000000010906dd34 _PyObject_Str + 127
  47  org.python.python               0x000000010906ddca PyObject_Str + 15
  48  org.python.python               0x00000001090769c2 0x109035000 + 268738
  49  org.python.python               0x00000001090800f9 0x109035000 + 307449
  50  org.python.python               0x000000010903ef72 PyObject_Call + 101
  51  org.python.python               0x00000001090b8df5 PyEval_EvalFrameEx + 15416
  52  org.python.python               0x00000001090b5093 PyEval_EvalCodeEx + 1641
  53  org.python.python               0x000000010905c796 0x109035000 + 161686
  54  org.python.python               0x000000010903ef72 PyObject_Call + 101
  55  org.python.python               0x00000001090499a7 0x109035000 + 84391
  56  org.python.python               0x000000010903ef72 PyObject_Call + 101
  57  org.python.python               0x00000001090bb01f PyEval_CallObjectWithKeywords + 93
  58  org.python.python               0x0000000109083a74 0x109035000 + 322164
  59  org.python.python               0x000000010906dbde PyObject_Repr + 49
  60  org.python.python               0x000000010906da93 0x109035000 + 232083
  61  org.python.python               0x000000010905563f PyFile_WriteObject + 137
  62  org.python.python               0x00000001090d9b5f 0x109035000 + 674655
  63  org.python.python               0x000000010903ef72 PyObject_Call + 101
  64  org.python.python               0x00000001090bb01f PyEval_CallObjectWithKeywords +     93
  65  org.python.python               0x00000001090b7682 PyEval_EvalFrameEx + 9413
  66  org.python.python               0x00000001090b5093 PyEval_EvalCodeEx + 1641
  67  org.python.python               0x00000001090b4a24 PyEval_EvalCode + 54
  68  org.python.python               0x00000001090d3c2c 0x109035000 + 650284
  69  org.python.python               0x00000001090d3a4e PyRun_InteractiveOneFlags + 365
  70  org.python.python               0x00000001090d353f PyRun_InteractiveLoopFlags + 188
  71  org.python.python               0x00000001090d33f0 PyRun_AnyFileExFlags + 60
  72  org.python.python               0x00000001090e4363 Py_Main + 2995
  73  libdyld.dylib                   0x00007fff8821b5fd start + 1
  
  Thread 0 crashed with X86 Thread State (64-bit):
    rax: 0x000000010e1810e0  rbx: 0x0000000000000000  rcx: 0xc4002be6c4209f06  rdx: 0x0000000000000000
    rdi: 0x0000000109584326  rsi: 0x00007fff56bca700  rbp: 0x00007fff56bca870  rsp: 0x00007fff56bca840
     r8: 0x0000000000000000   r9: 0x0800000000000100  r10: 0x2000000000000200  r11: 0x0000000004c09dce
    r12: 0x00007fff56bcaa88  r13: 0x00007fff56bcaa8c  r14: 0x00007fff56bcaa88  r15: 0x0000000000000000
    rip: 0x0000000109563567  rfl: 0x0000000000010206  cr2: 0x0000000000000000
  
  Logical CPU:     4
  Error Code:      0x00000006
  Trap Number:     14
  
  
  Binary Images:
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  </code></pre>