read_csv dumps core with python 2.7.10 and pandas 0.17.1 
I am reading a very large csv file (the NYC taxi dataset at https://storage.googleapis.com/tlc-trip-data/2015/), only two columns:
index_col=False,skipinitialspace=True,usecols=['pickup_longitude', 'pickup_latitude'], chunksize=...
I load it progressively by varying-size chunks, and use 2 threads to do the progressive loading.
After reading about 10M lines (the number varies from one run to the other), it dumps a core. 
Here is what GDB finds-out:

Fatal Python error: GC object already tracked
Fatal Python error: GC object already tracked

Program received signal SIGABRT, Aborted.
[Switching to Thread 0x7fffddd98700 (LWP 10284)]
0x00007ffff782dcc9 in __GI_raise (sig=sig@entry=6)
    at ../nptl/sysdeps/unix/sysv/linux/raise.c:56
56  ../nptl/sysdeps/unix/sysv/linux/raise.c: No such file or directory.
(gdb) where
#0  0x00007ffff782dcc9 in __GI_raise (sig=sig@entry=6)

```
at ../nptl/sysdeps/unix/sysv/linux/raise.c:56
```
#1  0x00007ffff78310d8 in __GI_abort () at abort.c:89
#2  0x000000000045a4f2 in Py_FatalError ()
#3  0x000000000052b5ec in PyTuple_New ()
#4  0x000000000050c73d in ?? ()
#5  0x000000000050d3f6 in Py_BuildValue ()
#6  0x00007fffec3d01d8 in buffer_rd_bytes (source=0x7fffd8006650,

```
nbytes=<optimized out>, bytes_read=0x7fffddd96d08, status=0x7fffddd96d04)
at pandas/src/parser/io.c:123
```
#7  0x00007fffec3cf065 in parser_buffer_bytes (nbytes=<optimized out>,

```
self=0x7fffd8003480) at pandas/src/parser/tokenizer.c:610
```
#8  _tokenize_helper (self=0x7fffd8003480, nrows=nrows@entry=3186,

```
all=all@entry=0) at pandas/src/parser/tokenizer.c:1872
```
#9  0x00007fffec3cf3e7 in tokenize_nrows (self=<optimized out>,

```
nrows=nrows@entry=3186) at pandas/src/parser/tokenizer.c:1905
```
#10 0x00007fffec39a3c4 in __pyx_f_6pandas_6parser_10TextReader__tokenize_rows (

```
__pyx_v_self=0x7fffdddd5050, __pyx_v_nrows=3186) at pandas/parser.c:8745
```
#11 0x00007fffec3a21a2 in __pyx_f_6pandas_6parser_10TextReader__read_rows (

```
__pyx_v_self=0x7fffdddd5050, __pyx_v_rows=0x7fffd8249a88, __pyx_v_trim=0)
at pandas/parser.c:8970
```
#12 0x00007fffec393f0c in __pyx_f_6pandas_6parser_10TextReader__read_low_memory

```
(__pyx_v_self=0x7fffdddd5050, __pyx_v_rows=0x7fffcb815948)
```
