linux-kernel - Re: tty-related oops in latest kernel(s)?

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Message-ID: <84144f020705292254o319f6619m787bf29491c92509@mail.gmail.com>
Date:	Wed, 30 May 2007 08:54:04 +0300
From:	"Pekka Enberg" <penberg@...helsinki.fi>
To:	"Tero Roponen" <teanropo@....fi>
Cc:	linux-kernel@...r.kernel.org, akpm@...ux-foundation.org,
	"Alan Cox" <alan@...rguk.ukuu.org.uk>,
	"Andy Whitcroft" <apw@...dowen.org>
Subject: Re: tty-related oops in latest kernel(s)?

On 5/30/07, Tero Roponen <teanropo@....fi> wrote:
> Hmmm, I just found something interesting. In 2.6.21.3 the /sbin/init
> gets corrupted when I watch the video!
>
> $ cp /sbin/init init.before
> $ mplayer kiwi.flv
> $ cp /sbin/init init.after
>
> The sha1sums are here:
>
> 52c8d643057619cbe137b8e69d4709ce3bdd832d  init.after
> 8efc7864a5b535a9e336fa82e9d7f112f3d956c1  init.before
>
> It seems that something corrupts memory somewhere...

To debug this a bit further:

$ od -a -t x1 -v init.after > init.after.dump
$ od -a -t x1 -v init.before > init.before.dump
$ diff -u init.before.dump init.after.dump | less

-0011340  nul nul nul  e9  f0  fe  ff  ff  ff   %   < soh enq  bs   h  80
-           00  00  00  e9  f0  fe  ff  ff  ff  25  3c  01  05  08  68  80
+0010000    y ack nul nul   y ack nul nul   y ack nul nul   y ack nul nul
+           79  06  00  00  79  06  00  00  79  06  00  00  79  06  00  00
+0010020    y ack nul nul   y ack nul nul   y ack nul nul   y ack nul nul
+           79  06  00  00  79  06  00  00  79  06  00  00  79  06  00  00
+0011340    y ack nul nul   y ack nul nul  ff   %   < soh enq  bs   h  80
+           79  06  00  00  79  06  00  00  ff  25  3c  01  05  08  68  80

The file at offset 0010000 - 0011348 is overwritten with the byte
pattern 79 06 00 00.

Do you see anything in the logs or is this a silent corruption? Did
you see this corruption with 2.6.19 or 2.6.22-rc3?
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