Re: pg11.1 jit segv

On Fri, Nov 16, 2018 at 10:24:46AM -0600, Justin Pryzby wrote:
> On Fri, Nov 16, 2018 at 08:38:26AM -0600, Justin Pryzby wrote:
> > The table is not too special, but was probably ALTERed to add columns a good
> > number of times by one of our processes.  It has ~1100 columns, including
> > arrays, and some with null_frac=1.  I'm trying to come up with a test case
> > involving column types and order.

Try this ?

SELECT 'DROP TABLE t; CREATE TABLE t (a3 text, a1 int[], '||array_to_string(array_agg('c'||i||' bigint default 0'),',')||'); INSERT INTO t VALUES(0)' FROM generate_series(1,999) i;
\gexec
SET jit=on; SET jit_above_cost=0; SELECT a3 FROM t LIMIT 9;

That's given all sorts of nice errors:

ERROR:  invalid memory alloc request size 18446744073709551613
ERROR:  compressed data is corrupted

And occasionally crashes and/or returns unrelated data:

 = '0', $21 = '0', $22 = '0', $23 = '0', $24 = '0', $25 = '2741'\x03
 n 21782 :constvalue 4 [ 0 0 0 0 0 0 0 0 ]}) :location 

Justin