[Xen-devel] Re: [PATCH] Fix qemu-dm segfault when multiple HVM domains

[John Clemens <jclemens@xxxxxxxxxxxxxxx>]

So far, so good.. This patch seems to fix things for me.. I have 4 domains 
running right now, 2 mostly idle, one running an 'ls -R /' loop in cygwin, 
and the fourth trudging through a chkdsk so it too is hitting the disk 
hard.  Domains have been up for about an hour now without any problems, 
which is a lot longer than before.
Please check it in when you can, and thanks.
john.c

- --
John Clemens                    jclemens@xxxxxxxxxxxxxxx

On Mon, 27 Feb 2006, Jiang, Yunhong wrote:

> Hi,  John
>         Can you try the attached patch ?
>
>         This issue can be reproduced on SMP platform, while the domain 0
> is UP. The reason is, after finishing a dma request, the dma thread will
> trigger the interrupt and then clear the call back function. When guest
> get the interrupt , it will try to check the call back function, if it
> is set, then it will trigger a dma request again. So if the checking for
> the callbackfunction happens between trigger interrupt and clear
> callback function on dma thread, it will cause NULL function calling.
> After with domain 0 UP and smp platform, this situation can be
> reproduced easily.
>
> Thanks
> Yunhong Jiang
>
>
> This patch fix this issue by placing the interupt request in the end of
> dma thread.
> > -----Original Message-----
> > From: xen-devel-bounces@xxxxxxxxxxxxxxxxxxx
> > [mailto:xen-devel-bounces@xxxxxxxxxxxxxxxxxxx] On Behalf Of
> > John Clemens
> > Sent: Thursday, February 23, 2006 6:12 AM
> > To: Li, Xin B
> > Cc: xen-devel@xxxxxxxxxxxxxxxxxxx
> > Subject: RE: [Xen-devel] qemu-dm segfault with multiple HVM domains?
> >
> >
> > Thanks, glad to know I'm not the only one seeing this...  I've opened
> > bug 542.
> >
> > http://bugzilla.xensource.com/bugzilla/show_bug.cgi?id=542
> >
> > john.c
> >
> > - --
> > John Clemens                    jclemens@xxxxxxxxxxxxxxx
> >
> > On Thu, 23 Feb 2006, Li, Xin B wrote:
> >
> > > > Just verifying that with cs 8932 I still see this problem.
> > > > I'm able to
> > > > start multiple windows domains, but either immediately or over
> > > > time all
> > > > but one qemu-dm processes segfaults.  This only appears to be
> > > > a problem
> > > > when I start multiple windows domains, a single domain seems
> > > > to work fine.
> > > >
> > > > qemu-dm[4961]: segfault at 0000000000000000 rip 0000000000000000 rsp
> > > > 0000000040800198 error 14
> > > > qemu-dm[4963]: segfault at 0000000000000000 rip 0000000000000000 rsp
> > > > 0000000040800198 error 14
> > > Thanks, I ever met this issue too, but did not pay much attention to
> > > this :-(
> > > Can you pls fire a bug?
> > > -Xin
> > >
> > > > john.c
> > > >
> > > > - --
> > > > John Clemens                    jclemens@xxxxxxxxxxxxxxx
> > > >
> > > >
> > > > _______________________________________________
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