Hi,
after upgrading from SQLite 3.7.13 to 3.7.14 our application crashed
with a SEGFAULT located within SQLite.
I boiled down the SQL statement and the tables used, and was able to
reproduce this also with the SQLite standalone binary available at
http://www.sqlite.org/sqlite-shell-linux-x86-3071400.zip
(Debian 6, AMD64).
I assume that the new optimizations on the query planner are causing
this problem; with 3.7.13 everything works fine.
HOW TO REPRODUCE:
-- create these tables and fill with data:
CREATE TABLE GROUPCUSTOMERS (
GC_GROUPID INTEGER NOT NULL,
GC_CUSTOMERID INTEGER NOT NULL,
GC_OBJECTTYPE INTEGER
);
INSERT INTO GROUPCUSTOMERS VALUES (1, 1, NULL);
CREATE TABLE GROUPPERMISSIONS (
GP_GROUPID INTEGER NOT NULL,
GP_MODULEID INTEGER NOT NULL,
GP_PERMISSIONID INTEGER NOT NULL
);
INSERT INTO GROUPPERMISSIONS VALUES (1, 1, 1);
CREATE TABLE GROUPUSERS (
GU_GROUPID INTEGER NOT NULL,
GU_USERID INTEGER NOT NULL,
GU_OBJECTTYPE INTEGER
);
-- then run this query:
SELECT * FROM
( SELECT GP_MODULEID AS CP_MODULEID, GP_PERMISSIONID AS CP_PERMISSIONID
FROM GROUPCUSTOMERS, GROUPPERMISSIONS
WHERE (GC_GROUPID = GP_GROUPID)
) AS A1
LEFT JOIN
( SELECT GP_MODULEID AS UP_MODULEID, GP_PERMISSIONID AS UP_PERMISSIONID
FROM GROUPUSERS, GROUPPERMISSIONS
WHERE (GU_GROUPID = GP_GROUPID)
) AS A2
ON (CP_MODULEID = UP_MODULEID)
OR (UP_PERMISSIONID = 0)
;
=> SEGFAULT
-- note that it is important to have these two records inserted,
-- without them the SQL will work.
-- AND: when running "ANALYZE" before running the SQL statement, the
-- query also succeeds!
In our application, the error occured at the sqlite3VdbeExec function at
"case OP_NullRow:" on the line "u.bn.pC->nullRow = 1;"
u.pn.pC is NULL at this point.
(tested with GDB and the original (bloated) SQL statement from within
our application)
We did NOT use the flag SQLITE_ENABLE_STAT3.
For any questions don't hezitate to contact me.
Best regards
-Klaus Keppler
--
______________________________________________________________________
Keppler IT GmbH - Die Hostingexperten.
Dipl.-Inf. Klaus Keppler Tel. (09131) 691-480
Geschäftsführer Fax: (09131) 691-489
Am Weichselgarten 7 UStID.-Nr. DE259788698
91058 Erlangen Amtsgericht Fürth, HRB 11477
www.keppler-it.de Sitz d. Gesellschaft: Erlangen
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