构建postgres GiST索引时出现分段错误

Question

我在Ubuntu 14.04 LTS上使用postgres 9.4。

执行此查询时：

create index a_idx on my_table using gist(my_column);

我收到错误：

erver closed the connection unexpectedly
        This probably means the server terminated abnormally
        before or while processing the request.
The connection to the server was lost. Attempting reset: Failed.
!> 

在日志中我可以看到：

2016-04-21 11:30:11 BST LOG:  server process (PID 7850) was terminated by signal 11: Segmentation fault

我检查了这个列是否有任何空值，但它没有。 我该怎么调试呢？

my_table的结构是：

                    Table "public.my_table"
  Column   |  Type   | Modifiers | Storage  | Stats target | Description 
-----------+---------+-----------+----------+--------------+-------------
 id        | integer | not null  | plain    |              |  
 my_column | bfp     |           | extended |              |