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From: Salatiel Filho <salatiel.filho@gmail.com>
Date: Fri, 18 Sep 2009 10:40:29 -0300
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Subject: Re: [dm-crypt] Data Corruption using cryptsetup luks on ARM arch
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On Tue, Sep 15, 2009 at 08:53, Arno Wagner <arno@wagner.name> wrote:
> On Tue, Sep 15, 2009 at 07:48:55AM -0300, Salatiel Filho wrote:
>> On Mon, Sep 14, 2009 at 18:10, Arno Wagner <arno@wagner.name> wrote:
>> > On Mon, Sep 14, 2009 at 06:25:10AM -0300, Salatiel Filho wrote:
>> >> On Mon, Sep 14, 2009 at 00:35, Arno Wagner <arno@wagner.name> wrote:
>> >> > On Sun, Sep 13, 2009 at 07:19:00PM -0300, Salatiel Filho wrote:
>> >> >> Where should i report that i get lots of corruption when using
>> >> >> cryptsetup on arm architecture ?
>> >> >>
>> >> >> - Can not use crypted swap , cause page allocator will fail and my
>> >> >> programs will start to seg fault.
>> >> >> - Some files just get corrupted on copying...
>> >> >>
>> >> >> Anyone can help me ?debug it , so i can report ?developers and the=
y
>> >> >> can fix this.
>> >> >
>> >> > If it generally works, but sometimes corrupts, then this
>> >> > very likely has nothing to to with dm-crypt. In fact it
>> >> > sounds like you have defective hardware, but more detail
>> >> > is needed for even a rough guess.
>> >> >
>> >> I do not think ?it is a hardware problem since the disk is ?fine and
>> >> it works fine in other architectures with no corruption at all. And
>> >> the page allocator failure always happens when using crypted swap but
>> >> there is no problem when using uncrypted swap.
>> >
>> > Determine the exact nature of the corruption. It is really
>> > a waste of time to speculate before you have that. Best
>> > option is a binary compare of a corrupted file with the
>> > uncorrupted version. Use something like
>> >
>> > cmp -b -l <file1> <file2>
>> I tried two corrupted files ...
>> Attached the cmp -b -l 'corrupted' 'ok' :
>>
>> -rw-r--r-- 1 root root 50000000 2009-09-15 07:04 file1.ori
>> -rw-r--r-- 1 root root 50000000 2009-09-15 06:21 file1.corrupted
>>
>> -rw-r--r-- 1 root root 50000000 2009-09-15 07:04 file2.ori
>> -rw-r--r-- 1 root root 50000000 2009-09-15 06:22 file2.corrupted
>
> Ok, at a guess (assuming quite a bit of zeros in the non-corrupted
> files), this looks like full sectors are written with zeros instead
> of the data they should hold. =A0This leaves out simple memory or
> other hardware corruption. I would be inclined to assume this
> is a software problem now.
which software ? cp ?
>
> Arno
> --
> Arno Wagner, Dr. sc. techn., Dipl. Inform., CISSP -- Email: arno@wagner.n=
ame
> GnuPG: =A0ID: 1E25338F =A0FP: 0C30 5782 9D93 F785 E79C =A00296 797F 6B50 =
1E25 338F
> ----
> Cuddly UI's are the manifestation of wishful thinking. -- Dylan Evans
>
> If it's in the news, don't worry about it. =A0The very definition of
> "news" is "something that hardly ever happens." -- Bruce Schneier
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--=20
[]'s
Salatiel

"O maior prazer do inteligente =E9 bancar o  idiota
   diante de um  idiota que banca o inteligente".