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Re: debugger question

From: "Murali M(dot) Krishna" <murali1729(at)yahoo(dot)com>
To: tomas(at)tuxteam(dot)de
Cc: pgsql-hackers(at)postgresql(dot)org
Subject: Re: debugger question
Date: 2010-04-13 05:32:11
Message-ID: 999599.216.qm@web52808.mail.re2.yahoo.com (view raw or flat)
Thread:
Lists: pgsql-hackers
The OS is

Fedora 12.






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--- On Mon, 4/12/10, tomas(at)tuxteam(dot)de <tomas(at)tuxteam(dot)de> wrote:

From: tomas(at)tuxteam(dot)de <tomas(at)tuxteam(dot)de>
Subject: Re: [HACKERS] debugger question
To: "Murali M. Krishna" <murali1729(at)yahoo(dot)com>
Cc: pgsql-hackers(at)postgresql(dot)org
Date: Monday, April 12, 2010, 9:28 PM

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On Mon, Apr 12, 2010 at 08:31:38PM -0700, Murali M. Krishna wrote:
> Hello:
> 
> I am brand new to Postgresql.
> 
> I ran the following commands.
> ./configure
> gmake
> su
> gmake install
> adduser postgres
> mkdir /usr/local/pgsql/data
> chown postgres /usr/local/pgsql/data
> su - postgres
> /usr/local/pgsql/bin/initdb -D /usr/local/pgsql/data
> /usr/local/pgsql/bin/postmaster -D /usr/local/pgsql/data >logfile 2>&1 &
> /usr/local/pgsql/bin/createdb test
> /usr/local/pgsql/bin/psql test
> 
> I would like to start using gdb.
> 
> What is the simplest way of doing this? I read the instructions
> on this page
> 
> http://sites.google.com/a/cs.berkeley.edu/cs186-fa09/home/assignments/assignment2/pggdb
> 
> , but this is what I get.
> 
> 
> gdb) attach 1731
> Attaching to program: /usr/local/pgsql/bin/postgres, process 1731
> ptrace: Operation not permitted.
> (gdb) break cost_seqscan
> Breakpoint 1 at 0x81cdf97: file costsize.c, line 163.
> (gdb) c
> The program is not being run.

Hm. Seems you got the right PID (gdb finds the executable after all).
Are you perhaps running under SELinux? (i just boldly assumed some
GNU/Linux). Which distribution, which kernel version (there seems to be
a bug in 2.4-ish Linux kernels which manifests itself like that, but
that's quite a while ago).

Next time, please tell us what OS is under you (although it might be fun
to watch people make wild guesses :)

Regards
- -- tomás
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