linux-ext4 - Re: Commit c1a1e7fc24d6 causes segfault in ext2fs_new

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Message-ID: <20120330131936.GB26221@amd.home.annexia.org>
Date:	Fri, 30 Mar 2012 14:19:36 +0100
From:	"Richard W.M. Jones" <rjones@...hat.com>
To:	Ext4 Developers List <linux-ext4@...r.kernel.org>
Cc:	Sami Liedes <sami.liedes@....fi>
Subject: Re: Commit c1a1e7fc24d6 causes segfault in ext2fs_new_inode

On Fri, Mar 30, 2012 at 01:57:26PM +0100, Richard W.M. Jones wrote:
> [I'm tracking this issue here:
> https://bugzilla.redhat.com/show_bug.cgi?id=808421]

A bit of further investigation:

I'm currently not passing EXT2_FLAG_64BITS when opening the
filesystem.  Passing this flag fixes the issue, so I'm going to do
that (are there any downsides?)

It seems like a non-64-bit-compatible bitmap was being created, and
that doesn't have the bitmap->bitmap_ops field initialized because
gen_bitmap.c doesn't use this field.  Somehow, though, we end up
calling a function in gen_bitmap64.c which requires that this field be
defined.

Rich.

-- 
Richard Jones, Virtualization Group, Red Hat http://people.redhat.com/~rjones
libguestfs lets you edit virtual machines.  Supports shell scripting,
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