REGR: pd.read_csv segfaults with 1.2 (has worked since before pandas 1.0)
- [x] I have checked that this issue has not already been reported.

- [x] I have confirmed this bug exists on the latest version of pandas.

- [x] (optional) I have confirmed this bug exists on the master branch of pandas.

---

#### Code Sample, a copy-pastable example

Wish I could give more information, but this is all I have (not sure I can share the input data):
```
 Fatal Python error: Segmentation fault
Current thread 0x00007f658531a740 (most recent call first):
  File "/usr/local/lib/python3.7/site-packages/pandas/io/parsers.py", line 2056 in read
  File "/usr/local/lib/python3.7/site-packages/pandas/io/parsers.py", line 1052 in read
  File "/usr/local/lib/python3.7/site-packages/pandas/io/parsers.py", line 463 in _read
  File "/usr/local/lib/python3.7/site-packages/pandas/io/parsers.py", line 605 in read_csv
```
Once I added the pin `pandas<1.2` everything works again.

#### Output of ``pd.show_versions()``

<details>

INSTALLED VERSIONS
------------------
commit           : 3e89b4c4b1580aa890023fc550774e63d499da25
python           : 3.7.9.final.0
python-bits      : 64
OS               : Linux
OS-release       : 4.4.0-1020-aws
Version          : #29-Ubuntu SMP Wed Jun 14 15:54:52 UTC 2017
machine          : x86_64
processor        : 
byteorder        : little
LC_ALL           : None
LANG             : C.UTF-8
LOCALE           : en_US.UTF-8
pandas           : 1.2.0
numpy            : 1.19.1
pytz             : 2020.5
dateutil         : 2.8.1
pip              : 20.2.2
setuptools       : 49.6.0
Cython           : None
pytest           : 6.2.1
hypothesis       : None
sphinx           : 3.4.1
blosc            : None
feather          : None
xlsxwriter       : None
lxml.etree       : 4.6.2
html5lib         : None
pymysql          : None
psycopg2         : 2.8.6 (dt dec pq3 ext lo64)
jinja2           : 2.11.2
IPython          : None
pandas_datareader: None
bs4              : None
bottleneck       : None
fsspec           : None
fastparquet      : None
gcsfs            : None
matplotlib       : None
numexpr          : None
odfpy            : None
openpyxl         : None
pandas_gbq       : None
pyarrow          : None
pyxlsb           : None
s3fs             : None
scipy            : 1.5.4
sqlalchemy       : 1.3.22
tables           : None
tabulate         : 0.8.7
xarray           : 0.16.2
xlrd             : None
xlwt             : None
numba            : None
None

</details>
