From sebastian.cartier at gmx.net  Tue Dec  6 02:51:40 2022
From: sebastian.cartier at gmx.net (Sebastian Cartier)
Date: Tue Dec  6 02:45:35 2022
Subject: [odb-users] segmentation fault on linux while operating Mysql
	database
Message-ID: <CAPmr0s83fjzLYe=RyCXfKJjpidM1db1dvq0+hGzStmXkVZTxLg@mail.gmail.com>

Hi Boris
I have the same problem as Gao Dejian on *Thu Aug 18 04:44:19 EDT 2016. I
use odb 2.4.0 on g++-5 on a Ubuntu Linux (I tried 2 systems). I checked the
connection with 'show processlist;' in mariadb and it actually establishes
the connection. The stacktrace is as follows:*









*Program received signal SIGSEGV, Segmentation fault.0x000055555555dfda in
odb::mysql::statement_cache::find_object<person> (this=0x0) at
/usr/include/odb/mysql/statement-cache.txx:2424      if (version_seq_ !=
conn_.database ().schema_version_sequence ())(gdb) bt#0  0x000055555555dfda
in odb::mysql::statement_cache::find_object<person> (this=0x0) at
/usr/include/odb/mysql/statement-cache.txx:24#1  0x000055555555b22f in
odb::access::object_traits_impl<person, (odb::database_id)0>::persist
(db=..., obj=...) at person-odb.cxx:403#2  0x000055555555864d in
odb::database::persist_<person, (odb::database_id)5> (obj=...,
this=<optimized out>) at /usr/include/odb/database.txx:38#3
 odb::database::persist<person> (obj=..., this=<optimized out>) at
/usr/include/odb/database.ixx:160#4  main (argc=7, argv=<optimized out>) at
driver.cxx:38*

*It looks like the statement_cache is never initialized. Do you have any
advice for me?*

*Thank you!*

*Sebastian*
From boris at codesynthesis.com  Tue Dec  6 05:59:05 2022
From: boris at codesynthesis.com (Boris Kolpackov)
Date: Tue Dec  6 05:52:44 2022
Subject: [odb-users] segmentation fault on linux while operating Mysql
	database
In-Reply-To: <CAPmr0s83fjzLYe=RyCXfKJjpidM1db1dvq0+hGzStmXkVZTxLg@mail.gmail.com>
References: <CAPmr0s83fjzLYe=RyCXfKJjpidM1db1dvq0+hGzStmXkVZTxLg@mail.gmail.com>
Message-ID: <boris.20221206125543@codesynthesis.com>

Sebastian Cartier <sebastian.cartier@gmx.net> writes:

> I have the same problem as Gao Dejian on *Thu Aug 18 04:44:19 EDT 2016. I
> use odb 2.4.0 on g++-5 on a Ubuntu Linux (I tried 2 systems). [...]
> 
> *Program received signal SIGSEGV, Segmentation fault.0x000055555555dfda in
> odb::mysql::statement_cache::find_object<person> (this=0x0) at
> /usr/include/odb/mysql/statement-cache.txx:2424

Hm, I don't see anything obvious in the code that could have caused
this. Could you try the latest pre-release and see if this is still
an issue:

https://codesynthesis.com/products/odb/doc/install-build2.xhtml