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Fixed bug#54486 - assert in my_seek, concurrent

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DROP/CREATE SCHEMA, CREATE TABLE, REPAIR.

The cause of assert was concurrent execution of
DROP DATABASE and REPAIR TABLE where first statement
deleted table's file .TMD at the same time as
REPAIR TABLE tried to read file details from the old file
that was just removed.

Additionally was fixed trouble when DROP TABLE try delete
all files belong to table being dropped at the same time
when REPAIR TABLE statement has just deleted .TMD file.

No regression test added because this would require adding a
sync point to mysys/my_redel.c. Since this bug is not present in
5.5+, adding test coverage was considered unnecessary.
The patch has been verified using RQG testing.
This commit is contained in:
Dmitry Shulga 2010-12-10 13:48:50 +06:00
parent 7a404214e0
commit dfb622726a
2 changed files with 25 additions and 8 deletions
Show stats Download patch file Download diff file Expand all files Collapse all files

31
sql/sql_db.cc
View file

@ -948,9 +948,6 @@ bool mysql_rm_db(THD *thd,char *db,bool if_exists, bool silent)
remove_db_from_cache(db);
pthread_mutex_unlock(&LOCK_open);
Drop_table_error_handler err_handler(thd->get_internal_handler());
thd->push_internal_handler(&err_handler);
error= -1;
/*
We temporarily disable the binary log while dropping the objects
@ -983,8 +980,8 @@ bool mysql_rm_db(THD *thd,char *db,bool if_exists, bool silent)
error = 0;
reenable_binlog(thd);
}
thd->pop_internal_handler();
}
if (!silent && deleted>=0)
{
const char *query;
@ -1213,16 +1210,34 @@ static long mysql_rm_known_files(THD *thd, MY_DIR *dirp, const char *db,
else
{
strxmov(filePath, org_path, "/", file->name, NullS);
if (my_delete_with_symlink(filePath,MYF(MY_WME)))
/*
We ignore ENOENT error in order to skip files that was deleted
by concurrently running statement like REAPIR TABLE ...
*/
if (my_delete_with_symlink(filePath, MYF(0)) &&
my_errno != ENOENT)
{
goto err;
my_error(EE_DELETE, MYF(0), filePath, my_errno);
goto err;
}
}
}
if (thd->killed ||
(tot_list && mysql_rm_table_part2(thd, tot_list, 1, 0, 1, 1)))
if (thd->killed)
goto err;
if (tot_list)
{
int res= 0;
Drop_table_error_handler err_handler(thd->get_internal_handler());
thd->push_internal_handler(&err_handler);
res= mysql_rm_table_part2(thd, tot_list, 1, 0, 1, 1);
thd->pop_internal_handler();
if (res)
goto err;
}
/* Remove RAID directories */
{
List_iterator<String> it(raid_dirs);

2
storage/myisam/mi_check.c
View file

@ -1741,6 +1741,8 @@ err:
MYF(MY_REDEL_MAKE_BACKUP): MYF(0))) ||
mi_open_datafile(info,share,name,-1))
got_error=1;
param->retry_repair= 0;
}
}
if (got_error)