Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1755718Ab1C3JyN (ORCPT ); Wed, 30 Mar 2011 05:54:13 -0400 Received: from mail-qy0-f174.google.com ([209.85.216.174]:64488 "EHLO mail-qy0-f174.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1755549Ab1C3JyM convert rfc822-to-8bit (ORCPT ); Wed, 30 Mar 2011 05:54:12 -0400 DomainKey-Signature: a=rsa-sha1; c=nofws; d=gmail.com; s=gamma; h=mime-version:in-reply-to:references:date:message-id:subject:from:to :cc:content-type:content-transfer-encoding; b=DT1bQwFf6jIo0cBqoCA+k0ShfhtzV/hM+fAGFZ/t8N7QbqHfeGkY9k6EIUXXaait60 01JXdQLw9kwX6guGAPua/D4luHK+4cTgq1AU7wsQQ5PBnd8U2ftDIQKxhCO9dal9mS7b LNeWIXPnbDda4Vr8KdwAmE+fyay3ySOYwE5bY= MIME-Version: 1.0 In-Reply-To: <1301476505.29074.47.camel@e102109-lin.cambridge.arm.com> References: <9bde694e1003020554p7c8ff3c2o4ae7cb5d501d1ab9@mail.gmail.com> <1300960540.32158.13.camel@e102109-lin.cambridge.arm.com> <1301395206.583.53.camel@e102109-lin.cambridge.arm.com> <1301399454.583.66.camel@e102109-lin.cambridge.arm.com> <1301476505.29074.47.camel@e102109-lin.cambridge.arm.com> Date: Wed, 30 Mar 2011 12:54:11 +0300 Message-ID: Subject: Re: kmemleak for MIPS From: Daniel Baluta To: Maxin John Cc: naveen yadav , linux-mips@linux-mips.org, linux-kernel@vger.kernel.org, linux-mm@kvack.org, Catalin Marinas Content-Type: text/plain; charset=ISO-8859-1 Content-Transfer-Encoding: 8BIT Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 1580 Lines: 41 >> unreferenced object 0x8f90d000 (size 4096): >> ? comm "swapper", pid 1, jiffies 4294937330 (age 815.000s) >> ? hex dump (first 32 bytes): >> ? ? 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ?................ >> ? ? 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ?................ >> ? backtrace: >> ? ? [<80529644>] alloc_large_system_hash+0x2f8/0x410 >> ? ? [<805383b4>] udp_table_init+0x4c/0x158 >> ? ? [<805384dc>] udp_init+0x1c/0x94 >> ? ? [<8053889c>] inet_init+0x184/0x2a0 >> ? ? [<80100584>] do_one_initcall+0x174/0x1e0 >> ? ? [<8051f348>] kernel_init+0xe4/0x174 >> ? ? [<80103d4c>] kernel_thread_helper+0x10/0x18 > > If you for the kmemleak scan (via echo) a few times, do you get more > leaks? The udp_table_init() function looks like it could leak some > memory but I haven't seen it before. I'm not sure whether this is a > false positive or a real leak. Looking again at udp_init_table it seem that a memory leak is possible. Could you post your .config and the full output of dmesg after booting. A situation where CONFIG_BASE_SMALL is 0, and table->mask < UDP_HTABLE_SIZE_MIN - 1 would lead to a memory leak. Furthermore, you can add some printks inside udp_init_table and check what is really happening there. ([1]) thanks, Daniel. [1] http://lxr.linux.no/linux+v2.6.38/net/ipv4/udp.c#L2125 thanks, Daniel. -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/