[libvirt] [PATCH 3/3] Remove wrong check for uml monitor response size

[Eric Blake]

On 08/16/2010 03:54 AM, Soren Hansen wrote:
> On Mon, Aug 16, 2010 at 11:37:07AM +0200, Soren Hansen wrote:
>> I'm running this on another kernel right now and I'm not seeing the
>> problem. I'll try again with the kernel I used a couple of days ago.
> 
> Ok, found the other kernel. Same diff as in my previous e-mail, same
> action. These are my results:
> 09:41:01.134: debug : umlMonitorCommand:698 : Run command 'config con0'
> 09:41:01.134: debug : umlMonitorCommand:733 : res.error: 6, res.extra: 0, res.length: 4096, res.data:
> 09:41:01.134: debug : umlMonitorCommand:736 : nbytes: 0
> 09:41:01.134: debug : umlMonitorCommand:738 : res.error: 0, res.extra: 0, res.length: 4, res.data: pts

> 
> This one's a 2.6.34.1 kernel. The one where I didn't see the problem is
> a 2.6.32.something-or-the-other kernel. Mindboggling.

Oh my.  This really does look like a kernel bug.  Can you confirm it
with an strace?  Have you reported this regression to the right kernel
folks?

I guess it would help if we could write a simpler test program to
isolate whether this recvfrom bug exists in a bare minimum number of
syscalls.  Meanwhile, I have no idea how to work around a buggy recvfrom
that doesn't return the correct number of bytes.

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

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