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The "RELEASE SAVEPOIN ..." query below causes a SEGFAULT in
0x00007fffe8a6ccfa in tr_merge_dbat (tr=0x7fffcc10c760, tdb=0x0)
at /net/toulouse/export/scratch2/zhang/monet-source/Jun2016/sql/storage/bat/bat_storage.c:2089
2089 if (tdb->cached) {
CREATE TABLE test (a int);
START TRANSACTION ;
SAVEPOINT failsafe;
ALTER TABLE test ADD COLUMN b int;
RELEASE SAVEPOINT failsafe;
COMMIT;
The crash seems to have been particularly caused by the use of ALTER TABLE, since it doesn't happen after, e.g., an "INSERT INTO test...".
Just for the records, next to ALTER TABLE, an UPDATE causes mserver5 to crash at the same place. For instance, these queries:
drop table t;
create table t (i int, j int);
insert into t values (10, 20);
start transaction;
savepoint sp;
UPDATE t set i = 42 where j = 20;
release savepoint sp;
commit;
select * from t;
Date: 2016-05-19 12:17:30 +0200
From: @yzchang
To: SQL devs <>
Version: 11.21.19 (Jul2015-SP4)
CC: @njnes, @yzchang
Last updated: 2016-06-23 10:24:25 +0200
Comment 22151
Date: 2016-05-19 12:17:30 +0200
From: @yzchang
The "RELEASE SAVEPOIN ..." query below causes a SEGFAULT in
0x00007fffe8a6ccfa in tr_merge_dbat (tr=0x7fffcc10c760, tdb=0x0)
at /net/toulouse/export/scratch2/zhang/monet-source/Jun2016/sql/storage/bat/bat_storage.c:2089
2089 if (tdb->cached) {
CREATE TABLE test (a int);
START TRANSACTION ;
SAVEPOINT failsafe;
ALTER TABLE test ADD COLUMN b int;
RELEASE SAVEPOINT failsafe;
COMMIT;
The crash seems to have been particularly caused by the use of ALTER TABLE, since it doesn't happen after, e.g., an "INSERT INTO test...".
Comment 22152
Date: 2016-05-19 14:53:42 +0200
From: MonetDB Mercurial Repository <>
Changeset 19ada2e374e8 made by Jennie Zhang y.zhang@cwi.nl in the MonetDB repo, refers to this bug.
For complete details, see http//devmonetdborg/hg/MonetDB?cmd=changeset;node=19ada2e374e8
Changeset description:
Comment 22154
Date: 2016-05-19 16:14:55 +0200
From: @yzchang
Just for the records, next to ALTER TABLE, an UPDATE causes mserver5 to crash at the same place. For instance, these queries:
drop table t;
create table t (i int, j int);
insert into t values (10, 20);
start transaction;
savepoint sp;
UPDATE t set i = 42 where j = 20;
release savepoint sp;
commit;
select * from t;
Comment 22155
Date: 2016-05-19 16:23:34 +0200
From: MonetDB Mercurial Repository <>
Changeset a40033240ec6 made by Jennie Zhang y.zhang@cwi.nl in the MonetDB repo, refers to this bug.
For complete details, see http//devmonetdborg/hg/MonetDB?cmd=changeset;node=a40033240ec6
Changeset description:
Comment 22174
Date: 2016-05-24 23:11:33 +0200
From: @njnes
fixed
Comment 22180
Date: 2016-05-26 14:19:04 +0200
From: @yzchang
Just for the record, this bug was fixed by http//devmonetdborg/hg/MonetDB?cmd=changeset;node=2eaffa87695a
Comment 22181
Date: 2016-05-26 16:49:06 +0200
From: MonetDB Mercurial Repository <>
Changeset 17d2b854e0fa made by Jennie Zhang y.zhang@cwi.nl in the MonetDB repo, refers to this bug.
For complete details, see http//devmonetdborg/hg/MonetDB?cmd=changeset;node=17d2b854e0fa
Changeset description:
Comment 22182
Date: 2016-05-26 16:50:04 +0200
From: MonetDB Mercurial Repository <>
Changeset c1144dfa2ca0 made by Jennie Zhang y.zhang@cwi.nl in the MonetDB repo, refers to this bug.
For complete details, see http//devmonetdborg/hg/MonetDB?cmd=changeset;node=c1144dfa2ca0
Changeset description:
Comment 22183
Date: 2016-05-26 16:52:25 +0200
From: @yzchang
That was just back porting tests accidentally added in Jun2016 to Jul2015
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