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Bug#41889: Test main.innodb_bug38231 is failing w/embedded server (server crash)

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The problem is that a mysql connection instance is not thread-safe
and reentrant, meaning that it can't be used concurrently and can't
be re-entered while it's already running. This applies for any form
of the server (embedded or not), but this rule can be violated in a
test case if the test sends a new command without waiting for the
result of previous command that was sent asynchronously and this can
lead to hangs when over a network or to crashes under embedded server
as the server query execution path will be re-entered concurrently
with the same connection structure.

The solution is to rework the test case so that the aforementioned
rule is obeyed.
This commit is contained in:
Davi Arnaut
2009-01-08 10:31:34 -02:00
parent b2944d215c
commit e39288b4e4
1 changed files with 3 additions and 11 deletions
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14
mysql-test/t/innodb_bug38231.test
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@ -16,7 +16,6 @@ CREATE TABLE bug38231 (a INT);
-- connect (con1,localhost,root,,) -- connect (con1,localhost,root,,)
-- connect (con2,localhost,root,,) -- connect (con2,localhost,root,,)
-- connect (con3,localhost,root,,)
-- connection con1 -- connection con1
SET autocommit=0; SET autocommit=0;
@ -27,11 +26,6 @@ SET autocommit=0;
-- send -- send
LOCK TABLE bug38231 WRITE; LOCK TABLE bug38231 WRITE;
-- connection con3
SET autocommit=0;
-- send
LOCK TABLE bug38231 WRITE;
-- connection default -- connection default
-- send -- send
TRUNCATE TABLE bug38231; TRUNCATE TABLE bug38231;
@ -39,6 +33,7 @@ TRUNCATE TABLE bug38231;
-- connection con1 -- connection con1
# give time to TRUNCATE and others to be executed; without sleep, sometimes # give time to TRUNCATE and others to be executed; without sleep, sometimes
# UNLOCK executes before TRUNCATE # UNLOCK executes before TRUNCATE
# TODO: Replace with wait_condition once possible under embedded server.
-- sleep 0.2 -- sleep 0.2
# this crashes the server if the bug is present # this crashes the server if the bug is present
UNLOCK TABLES; UNLOCK TABLES;
@ -46,16 +41,13 @@ UNLOCK TABLES;
# clean up # clean up
-- connection con2 -- connection con2
UNLOCK TABLES; -- reap
-- connection con3
UNLOCK TABLES; UNLOCK TABLES;
-- connection default -- connection default
-- reap
-- disconnect con1 -- disconnect con1
-- disconnect con2 -- disconnect con2
-- disconnect con3
# test that TRUNCATE works with with row-level locks # test that TRUNCATE works with with row-level locks