Обсуждение: BUG #15207: In crash recovery,SyncDataDirectory() will fall into recursion trap
BUG #15207: In crash recovery,SyncDataDirectory() will fall into recursion trap
The following bug has been logged on the website: Bug reference: 15207 Logged by: bret shao Email address: bret.shao@outlook.com PostgreSQL version: 9.5.7 Operating system: windows 10 Description: Hi, I'm R&D engineer of HighGo Co. Ltd. i run the test case as below. I install the PG at location "D:\highgo\database\", then i create a table space with "create tablespace spacetest location 'D:\highgo\database\'" then make the PG crash. In crash recovery, SyncDataDirectory() will be called in function StartupXLOG(), in this function will call walkdir() to fsync the dir and its contents. Because of that the table space spacetest is point to data dir of PG, here is 'D:\highgo\database\', so function walkdir will fall into recursion trap due to lstat is defined to stat in windows environment when the pg_tblspc is handled. Due to windows restrict the length of filename to 255, so the recursion will terminate when the length of file name reach 255. Although, this issue will not affect the startup of PG but i think this issue should be considered to fix. the logs are showed as below. 2018-05-23 09:39:46 HKTLOG: 58P01: could not stat file "./pg_tblspc/16384/pg_tblspc/16384/pg_tblspc/16384/pg_tblspc/16384/pg_tblspc/16384/pg_tblspc/16384/pg_tblspc/16384/pg_tblspc/16384/pg_tblspc/16384/pg_tblspc/16384/pg_tblspc/16384/pg_tblspc/16384/hgdb_log/postgresql-2018-05-23_082809.log": No such file or directory 2018-05-23 09:39:46 HKTLOG: 58P01: could not stat file ......... 2018-05-23 09:43:24 HKTLOG: 58P01: could not stat file "pg_tblspc/16384/pg_tblspc/16384/pg_tblspc/16384/pg_tblspc/16384/pg_tblspc/16384/pg_tblspc/16384/pg_tblspc/16384/pg_tblspc/16384/pg_tblspc/16384/pg_tblspc/16384/pg_tblspc/16384/pg_tblspc/16384/pg_tblspc/16384/pg_xlog/archive_status": No such file or directory 2018-05-23 09:43:25 HKTLOG: 00000: database system was not properly shut down; automatic recovery in progress 2018-05-23 09:43:25 HKTLOG: 00000: invalid record length at 0/1743418 2018-05-23 09:43:25 HKTLOG: 00000: redo is not required 2018-05-23 09:43:25 HKTLOG: 00000: MultiXact member wraparound protections are now enabled 2018-05-23 09:43:25 HKTLOG: 00000: database system is ready to accept connections 2018-05-23 09:43:25 HKTLOG: 00000: autovacuum launcher started thanks. Br. Bret
=?utf-8?q?PG_Bug_reporting_form?= <noreply@postgresql.org> writes: > I install the PG at location "D:\highgo\database\", then i create a table > space with "create tablespace spacetest location 'D:\highgo\database\'" This is pilot error isn't it? It's certainly hard to see what would be the value of making a tablespace pointing at the data directory itself. Offhand, I think we do not support tablespaces that are physically inside the data directory, either. I think there's been some discussion of having CREATE TABLESPACE try to detect and reject such cases. But it would be easy enough to fool it (through symlinks, variant path spellings, etc), that people haven't been excited about adding such a check. regards, tom lane
Re: BUG #15207: In crash recovery, SyncDataDirectory() will fallinto recursion trap
On Wed, May 23, 2018 at 09:36:33AM -0400, Tom Lane wrote: > Offhand, I think we do not support tablespaces that are physically inside > the data directory, either. pg_upgrade and pg_basebackup work funnily in such cases. > I think there's been some discussion of having CREATE TABLESPACE try to > detect and reject such cases. But it would be easy enough to fool it > (through symlinks, variant path spellings, etc), that people haven't been > excited about adding such a check. 33cb8ff6 has added a warning when doing this operation. Here is the related thread: https://www.postgresql.org/message-id/CA%2BTgmobZLyLU8tFCbMqbjMWB6t%2B%3DERaDo820uQEJCVAQK_Paow%40mail.gmail.com -- Michael
Вложения
I have got the history of this issue.
Thanks.
Br.
Bret
发送自 Windows 10 版邮件应用
发件人: Michael Paquier
发送时间: 2018年5月23日 22:03
收件人: Tom Lane
抄送: bret.shao@outlook.com; pgsql-bugs@lists.postgresql.org
主题: Re: BUG #15207: In crash recovery, SyncDataDirectory() will fall into recursion trap
On Wed, May 23, 2018 at 09:36:33AM -0400, Tom Lane wrote:
> Offhand, I think we do not support tablespaces that are physically inside
> the data directory, either.
pg_upgrade and pg_basebackup work funnily in such cases.
> I think there's been some discussion of having CREATE TABLESPACE try to
> detect and reject such cases. But it would be easy enough to fool it
> (through symlinks, variant path spellings, etc), that people haven't been
> excited about adding such a check.
33cb8ff6 has added a warning when doing this operation. Here is the
related thread:
https://www.postgresql.org/message-id/CA%2BTgmobZLyLU8tFCbMqbjMWB6t%2B%3DERaDo820uQEJCVAQK_Paow%40mail.gmail.com
--
Michael