Assertion failed: (bn->batCapacity >= cnt), function BAT_scanselect, file gdk_select.c, line 1008.

[monetdb-team]

Date: 2015-08-11 12:14:22 +0200
From: @hannesmuehleisen
To: SQL devs <>
Version: 11.19.3 (Oct2014)

Last updated: 2015-08-28 13:43:11 +0200

Comment 21115

Date: 2015-08-11 12:14:22 +0200
From: @hannesmuehleisen

User-Agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10_10_4) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/44.0.2403.130 Safari/537.36
Build Identifier:

When running the following query, an assertion fails and kills mserver

SELECT t.rcl,SUM(ct) as t,SUM(cr) as r,SUM(ce) as tel, COUNT(*) as r1 FROM (select ct,cr,ce, case when ct = 0 then 0 when ct BETWEEN 1 AND 10000 then 1 when ct BETWEEN 10000 AND 50000 then 2 when ct BETWEEN 50000 AND 100000 then 3 when ct BETWEEN 100000 AND 200000 then 4 when ct BETWEEN 200000 AND 300000 then 5 when ct BETWEEN 300000 AND 500000 then 6 when ct BETWEEN 500000 AND 1000000 then 7 when ct BETWEEN 1000000 AND 2000000 then 8 when ct BETWEEN 2000000 AND 5000000 then 9 when ct BETWEEN 5000000 AND 10000000 then 10 when ct > 10000000 then 11 else 12 end as rcl from (SELECT reservedCid,ct,cr,ce FROM (SELECT jt.column1 as reservedCid,SUM(ri.column1) as ct,COUNT(ri.id) as cr,SUM(ri.el) as ce FROM Table3 as jt, (SELECT column3 as el, * FROM Table1) as ri WHERE (ri .column2 = 'R') AND jt.column2 = ri.id group by jt.column1) AS agg, Table2 AS contract WHERE agg.reservedCid = contract.id) as ft) as t GROUP BY t.rcl ORDER BY t.rcl;

Reproducible: Always

Steps to Reproduce:

1. import from http://wikistats.ins.cwi.nl/lsde-data/schema-and-data-scanselect-assertion.sql.xz
2. run query above
3. crash

Actual Results:

Crash

Expected Results:

Some result or an error message

Here is a stack trace

 frame 4: 0x000000010040259a libbat.12.dylib`BAT_scanselect(b=0x00000001051531d0, s=0x00000001051582e0, bn=0x0000000105172f20, tl=0x000000010419b570, th=0x000000010419b570, li=1, hi=1, equi=1, anti=0, lval=1, hval=1, maximum=358031, use_imprints=0) + 9002 at gdk_select.c:1008
 frame 5: 0x00000001003fd54b libbat.12.dylib`BATsubselect(b=0x00000001051531d0, s=0x00000001051582e0, tl=0x000000010419b570, th=0x000000010419b570, li=1, hi=1, anti=0) + 36267 at gdk_select.c:1704
 frame 6: 0x00000001000ec549 libmonetdb5.19.dylib`ALGsubselect2(result=0x0000000101092970, bid=0x0000000101092250, sid=0x00000001010921d0, low=0x000000010419b570, high=0x000000010419b570, li=0x0000000101090350, hi=0x0000000101090650, anti=0x0000000101090650) + 841 at algebra.c:341

Comment 21117

Date: 2015-08-11 15:11:41 +0200
From: @sjoerdmullender

I couldn't initially reproduce this problem, but if I set the number of threads to 4, I could.

Comment 21119

Date: 2015-08-11 15:41:36 +0200
From: MonetDB Mercurial Repository <>

Changeset fff94a9041d2 made by Sjoerd Mullender sjoerd@acm.org in the MonetDB repo, refers to this bug.

For complete details, see http//devmonetdborg/hg/MonetDB?cmd=changeset;node=fff94a9041d2

Changeset description:

Off-by-one error.
p is incremented before the number of remaining items is calculated, a
calculation that involves p.  Compensate for the early increment.
This fixes bug #3784.

Comment 21234

Date: 2015-08-28 13:43:11 +0200
From: @sjoerdmullender

Jul2015 has been released.