linux-ext4 - Re: Segmentation fault in mke2fs

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Date:	Mon, 16 Dec 2013 11:17:09 -0500
From:	Srivatsan Canchivaram <crsrivatstechnical@...il.com>
To:	"Theodore Ts'o" <tytso@....edu>
Cc:	linux-ext4@...r.kernel.org
Subject: Re: Segmentation fault in mke2fs

Hi Ted,

The hardware is a stable product that has been in use for a while.
We have experienced a number of issues with the toolchain that we
received from the vendor.
They are about to release a new, official version this week.

So, I will try this test again with the new toolchain at some point soon.

Thanks to you and Eric for the replies.

Best,
Sri

On Sat, Dec 14, 2013 at 1:59 AM, Theodore Ts'o <tytso@....edu> wrote:
> On Fri, Dec 13, 2013 at 06:33:22PM -0500, Srivatsan Canchivaram wrote:
>> Hello,
>>
>> I found that the segmentation fault occurs in optimized code (-O2). It
>> does not happen when optimization is turned off. I am not sure what
>> exactly happened but mke2fs is now able to get past that point.
>
> This is really starting to smell like a compiler bug.  Are you sure
> you are using a stable version of gcc?
>
>> The command now fails at a different point:
>>
>> ext2fs_mkdir: EXT2 directory corrupted while creating /lost+found
>>
>> Tracing from the ext2fs_mkdir() function, I found that the code
>> returns an error here:
>> ext2fs_read_dir_block3(): returns EXT2_ET_DIR_CORRUPTED
>
> The mke2fs program has just created the root directory, and when it is
> trying to link the newly created lost+found directory to the root
> directory, when it reads in the just-created root directory, when it
> tries to byte-swap the directory block, the values found the root
> directory were insane.
>
> Combined with the fact that the other failure was someplace completely
> diferent, I'm at this point deeply suspicious about your compiler tool
> chain and/or your hardware where you are conducting your tests.
>
>                                          - Ted
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