linux-kernel - O_DIRECT error, user space programming

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Message-ID: <53313.62.101.126.236.1164811670.squirrel@webmail2.ictp.trieste.it>
Date:	Wed, 29 Nov 2006 15:47:50 +0100 (CET)
From:	"Leto Angelo" <aleto@...p.it>
To:	linux-kernel@...r.kernel.org
Subject: O_DIRECT error, user space programming

Hi,
I got an:
*** glibc detected *** double free or corruption (!prev): 0x84c01000 ***
using O_DIRECT with threads: this error appends if I run several threads
wich are reading several files (opened with O_RDONLY|O_DIRECT) at the same
time.
The error doesn't appends if I open the files whithout O_DIRECT or if I
place a pthread_join after each thread call.
I'm sure that no double free is done.
kernel version: 2.6.17 SMP PREEMPT
glibc version: 2.3.6
filesystem: ext3
g++ used: g++ (GCC) 4.0.4 20060507 (prerelease) (Debian 4.0.3-3)
Does somebody knows the reasons of the error? There are limitation to use
O_DIRECT on a multithread application?
Thanks in advance for any help.
A.

ps. I can provide the source code code (135 lines of C++) if it is useful
to uinderstand better the problem

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