From mboxrd@z Thu Jan 1 00:00:00 1970 Return-path: Received: from mail-ew0-f31.google.com ([209.85.219.31]:63749 "EHLO mail-ew0-f31.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S937808AbZAPWKb (ORCPT ); Fri, 16 Jan 2009 17:10:31 -0500 Received: by ewy12 with SMTP id 12so664532ewy.13 for ; Fri, 16 Jan 2009 14:10:28 -0800 (PST) Message-ID: <497105D1.5040906@gmail.com> (sfid-20090116_231039_492057_B5A3A364) Date: Fri, 16 Jan 2009 23:10:25 +0100 From: Artur Skawina MIME-Version: 1.0 To: Christian Lamparter CC: Johannes Berg , Larry Finger , Artur Skawina , linux-wireless@vger.kernel.org Subject: Re: wireless-testing, p54 and sinus 154 data no longer works References: <494698AF.4020204@gmail.com> <496FFC9F.1000907@lwfinger.net> <1232097187.3854.9.camel@johannes> <200901162138.51855.chunkeey@web.de> In-Reply-To: <200901162138.51855.chunkeey@web.de> Content-Type: text/plain; charset=UTF-8 Sender: linux-wireless-owner@vger.kernel.org List-ID: Christian Lamparter wrote: > On Friday 16 January 2009 10:13:07 Johannes Berg wrote: >> On Thu, 2009-01-15 at 21:18 -0600, Larry Finger wrote: >> >>>>> Object 0xddec18d0: >69< 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b ikkkkkkkkkkkkkkk >>> I too have seen real single bit changes - in my case 6b went to 6a, >>> and my memory is fine. I wouldn't necessarily blame your hardware. >> 6b to 6a is often the result of a refcounting bug that happens to unref >> a value _after_ it has been freed. But that doesn't explain 6b to 69, >> unless you happen to have _two_ refcounting bugs. Not that I necessarily >> think that memory is bad > Well, this idiotic debug patch (kref-kernel-debug-patch) could shed some light into > the problem who's using a freed skb. didn't trigger anything here, just the usual: BUG kmalloc-4096: Poison overwritten ----------------------------------------------------------------------------- INFO: 0xdc8161b0-0xdc8161b0. First byte 0x6a instead of 0x6b INFO: Allocated in dev_alloc_skb+0x19/0x30 age=1762 cpu=0 pid=3530 INFO: Freed in __kfree_skb+0xf/0x90 age=613 cpu=0 pid=3527 INFO: Slab 0xc1390200 objects=7 used=5 fp=0xdc816120 flags=0x400020c2 INFO: Object 0xdc816120 @offset=24864 fp=0xdc8140c0 but no other warnings... artur