GNU bug report logs - #9145
"BUG" in dd when pushing output over ssh

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Message #5 received at submit <at> debbugs.gnu.org (full text, mbox):

From: Andrew Lisciandrello <andrewlisciandrello <at> gmail.com>
To: bug-coreutils <at> gnu.org
Subject: "BUG" in dd when pushing output over ssh
Date: Thu, 21 Jul 2011 21:36:27 -0400

[Message part 1 (text/plain, inline)]

Hello,

I came across this bug, I don't know what it means but I figured you may
want to see it.

Text States:
"BUG: Bad page state in process dd   pfm:98a00
page:ffffea0002163000 flags:4000000000000000 count:0 mapcount:0
mapping:020000000"

What I did to produce this error:
Boot two Laptops with identical HDDs with the archlinux(x64) netboot .iso,
imaged onto USB.
Install openssh on both.
connect both to a linksys router acting as a switch and WAP with DD-WRT
   please note: this router may be dropping packets or doing something else
equally stupid.
run # dd if=/dev/sda | ssh root <at> host "dd of=/dev/sda"


--Andrew Lisciandrello


P.S. If my first email made it though your span filter, I apoligize, for the
duplicate ticket.

[Message part 2 (text/html, inline)]

[IMG00052-20110721-2120.jpg (image/jpeg, attachment)]

Message #8 received at 9145 <at> debbugs.gnu.org (full text, mbox):

From: Eric Blake <eblake <at> redhat.com>
To: Andrew Lisciandrello <andrewlisciandrello <at> gmail.com>
Cc: 9145 <at> debbugs.gnu.org
Subject: Re: bug#9145: "BUG" in dd when pushing output over ssh
Date: Fri, 22 Jul 2011 07:06:47 -0600

On 07/21/2011 07:36 PM, Andrew Lisciandrello wrote:
> Hello,
>
> I came across this bug, I don't know what it means but I figured you may
> want to see it.
>
> Text States:
> "BUG: Bad page state in process dd   pfm:98a00
> page:ffffea0002163000 flags:4000000000000000 count:0 mapcount:0
> mapping:020000000"

Unfortunately, that means you encountered a kernel fault, perhaps due to 
an I/O error while trying to read or write /dev/sda.  That message is 
printed by your kernel, not by dd, so there's nothing we can do on this 
list to help you with it.

-- 
Eric Blake   eblake <at> redhat.com    +1-801-349-2682
Libvirt virtualization library http://libvirt.org

Message #13 received at 9145-done <at> debbugs.gnu.org (full text, mbox):

From: Eric Blake <eblake <at> redhat.com>
To: andrewlisciandrello <at> gmail.com, 9145-done <at> debbugs.gnu.org
Subject: Re: bug#9145: "BUG" in dd when pushing output over ssh
Date: Fri, 22 Jul 2011 07:13:42 -0600

tag 9145 unreproducible
thanks


On 07/22/2011 07:09 AM, andrewlisciandrello <at> gmail.com wrote:

>> Unfortunately, that means you encountered a kernel fault, perhaps due to
>> an I/O error while trying to read or write /dev/sda.  That message is
>> printed by your kernel, not by dd, so there's nothing we can do on this
>> list to help you with it.
>>

> I'm not really worried about it, especially as an md5 of both drives shows as equal after the dd was over.  Feel free to mark this resolved, I just wanted to be sure you had the error message in case it was useful to you in any way.

Good to hear; I'm re-adding the list and marking the bug closed.

>
> Also, thanks for working on kickass utils!

Our pleasure!

-- 
Eric Blake   eblake <at> redhat.com    +1-801-349-2682
Libvirt virtualization library http://libvirt.org

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