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Date: Tue, 21 May 2013 09:54:15 +0800
From: Fam Zheng <famz@redhat.com>
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Subject: Re: [Qemu-devel] [PATCH v3 00/10] curl: fix curl read
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To: "Richard W.M. Jones" <rjones@redhat.com>
Cc: kwolf@redhat.com, jcody@redhat.com, qemu-devel@nongnu.org, stefanha@redhat.com

On Mon, 05/20 09:49, Richard W.M. Jones wrote:
> On Mon, May 20, 2013 at 09:41:06AM +0100, Richard W.M. Jones wrote:
> > On Mon, May 20, 2013 at 03:03:34PM +0800, Fam Zheng wrote:
> > > CURL library API has changed, the current curl driver is not working.
> > > This patch rewrites the use of API as well as the structure of internal
> > > states. 
> > 
> > I tried this, but it segfaults:
> > 
> > Program terminated with signal 11, Segmentation fault.
> 
> That stack trace was wrong.  I was testing against the version of
> libcurl in Fedora which is known to be broken.
> 
> Here is the stack trace, this time really running against
> curl-7_30_0-147-gae26ee3:
> 
> Program terminated with signal 11, Segmentation fault.
> #0  curl_read_cb (ptr=<optimized out>, size=<optimized out>, 
>     nmemb=<optimized out>, opaque=0x7f63d48ba340) at block/curl.c:240
> 240         size_t aio_base = acb->sector_num * SECTOR_SIZE;

Looks like a memory corrupt (QLIST head is invalid pointer). But I can't
reproduce here with your steps. Can you try qemu-io?

$LD_LIBRARY_PATH=~/d/curl/lib/.libs ~/d/qemu/qemu-io http://192.168.0.249/scratch/winxp.img -c 'read 0 512'

Thanks.

-- 
Fam