pabloa98 <pabloa98@xxxxxxxxx> writes:
> I just migrated our databases from PostgreSQL version 9.6 to version 11.1.
> We got a segmentation fault while running this query:
> SELECT f_2110 as x FROM baseline_denull
> ORDER BY eid ASC
> limit 500
> OFFSET 131000;
> the table baseline_denull has 1765 columns, mainly numbers, like:
Hm, that sounds like it matches this recent bug fix:
Author: Andres Freund <andres@xxxxxxxxxxx>
Branch: master [b23852766] 2018-11-27 10:07:03 -0800
Branch: REL_11_STABLE [aee085bc0] 2018-11-27 10:07:43 -0800
Fix jit compilation bug on wide tables.
The function generated to perform JIT compiled tuple deforming failed
when HeapTupleHeader's t_hoff was bigger than a signed int8. I'd
failed to realize that LLVM's getelementptr would treat an int8 index
argument as signed, rather than unsigned. That means that a hoff
larger than 127 would result in a negative offset being applied. Fix
that by widening the index to 32bit.
Add a testcase with a wide table. Don't drop it, as it seems useful to
verify other tools deal properly with wide tables.
Thanks to Justin Pryzby for both reporting a bug and then reducing it
to a reproducible testcase!
Reported-By: Justin Pryzby
Author: Andres Freund
Discussion: https://postgr.es/m/20181115223959.GB10913@xxxxxxxxxxxxx
Backpatch: 11, just as jit compilation was
This would result in failures on wide rows that contain some null
entries. If your table is mostly-not-null, that would fit the
observation that it only crashes on a few rows.
Can you try REL_11_STABLE branch tip and see if it works for you?
regards, tom lane
