RE: Deadlock when executing multiple select statements from multiple threads

Thanks Hiroshi !

________________________________
From: Inoue, Hiroshi [h-inoue(at)dream(dot)email(dot)ne(dot)jp]
Sent: Monday, April 16, 2018 8:48 PM
To: Ayman Samamry
Cc: pgsql-odbc(at)postgresql(dot)org; Henry Santosa; Denn Sporcic
Subject: Re: Deadlock when executing multiple select statements from multiple threads

Hi,

On 2018/04/16 9:41, Ayman Samamry wrote:
Hi,

The deadlock with the ‘select’ statement is fixed, however it seems that the other operations (update/insert/delete) still cause a similar deadlock too…(can be easily reproduced if you replace the selects with any of the other operations).

Could you please retry the test drivers 10.02.0101 on Windows at
https://winpg.jp/~inoue/psqlodbc/index.html<https://winpg.jp/%7Einoue/psqlodbc/index.html>
?

regards,
Hiroshi Inoue

Regards,
Ayman

From: Inoue, Hiroshi [mailto:h-inoue(at)dream(dot)email(dot)ne(dot)jp]
Sent: Friday, April 13, 2018 6:52 PM
To: Ayman Samamry <Ayman(dot)Samamry(at)ir(dot)com><mailto:Ayman(dot)Samamry(at)ir(dot)com>
Cc: pgsql-odbc(at)postgresql(dot)org<mailto:pgsql-odbc(at)postgresql(dot)org>; Henry Santosa <Henry(dot)Santosa(at)ir(dot)com><mailto:Henry(dot)Santosa(at)ir(dot)com>; Denn Sporcic <Denn(dot)Sporcic(at)ir(dot)com><mailto:Denn(dot)Sporcic(at)ir(dot)com>
Subject: Re: Deadlock when executing multiple select statements from multiple threads

Hi,
On 2018/04/11 12:03, Inoue, Hiroshi wrote:
Hi Ayman,

Thanks for the report.
I would examine the issue.

Could you please try the test drivers 10.02.0100 on Windows at
https://winpg.jp/~inoue/psqlodbc/index.html<https://winpg.jp/%7Einoue/psqlodbc/index.html>
?

regards,
Hiroshi Inoue

regards,
Hiroshi Inoue
On 2018/04/10 14:51, Ayman Samamry wrote:
Hello,

We are having a deadlock issue when executing multiple select statements from multiple threads, the issue happens with driver version (9.6.4.0) or newer, doesn’t happen on 9.6.3.1 .
I’ve attached a simple project that triggers the deadlock, tested with visual studio 2017, release x64 build, PostgreSQL 10.3, usually happens after few runs.[please note that the proper database connection string and the table names need to be provided in the code for it to work].
I’ve also included the stack trace of the two threads in deadlock.

Regards,
Ayman

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