RE: [Xen-devel] xm pause causing lockup

["Ian Pratt" <m+Ian.Pratt@xxxxxxxxxxxx>]

Wild! It really is looping in get_page_type.

Any chance you could use the serial debugger to find out what x, nx and
y are in the cmpxchg?

I've tried to think of duff inputs that could cause it to loop, but I'm
not smart enough.

Ian 

> -----Original Message-----
> From: Kip Macy [mailto:kip.macy@xxxxxxxxx] 
> Sent: 15 April 2005 18:13
> To: Ian Pratt
> Cc: Keir Fraser; xen-devel; ian.pratt@xxxxxxxxxxxx
> Subject: Re: [Xen-devel] xm pause causing lockup
> 
> Great, thanks. I'm now running a completely fresh tree from 
> last night.
> 
> Over the course of several minutes I hit 'd' a number of 
> times. The addresses I got were:
> 
> 0xfc51c742
> 0xfc51c746
> 0xfc51c74b
> 0xfc51c740
> 
> (gdb) x/i 0xfc51c742
> 0xfc51c742 <get_page_type+1218>:        mov    0x40(%esp,1),%eax
> (gdb) x/i 0xfc51c746
> 0xfc51c746 <get_page_type+1222>:        mov    0x14(%eax),%ebx
> (gdb) x/i 0xfc51c74b
> 0xfc51c74b <get_page_type+1227>:        je     0xfc51c740 
> <get_page_type+1216>
> (gdb) x/i 0xfc51c740
> 0xfc51c740 <get_page_type+1216>:        repz nop 
> 
> 
>                -Kip
> 
> On 4/14/05, Ian Pratt <m+Ian.Pratt@xxxxxxxxxxxx> wrote:
> > 
> > 
> > > -----Original Message-----
> > > From: xen-devel-bounces@xxxxxxxxxxxxxxxxxxx
> > > [mailto:xen-devel-bounces@xxxxxxxxxxxxxxxxxxx] On Behalf 
> Of Kip Macy
> > > Sent: 15 April 2005 05:36
> > > To: Keir Fraser
> > > Cc: xen-devel
> > > Subject: Re: [Xen-devel] xm pause causing lockup
> > >
> > > To further check this I added:
> > >  printk("%s %d %d %d %d %d\n", __FUNCTION__, op->cmd,
> > > op->mfn, count, success_count, domid); to
> > > HYPERVISOR_mmuext_op and something similar to mmu_update.
> > 
> > Is your hypothesis that Xen gets stuck in either the mmuext_op or 
> > mmu_update loops?
> > Are you running with watchdog enabled?
> > 
> > It might be good to add a printk at the end so that you can 
> prove this.
> > 
> > Hitting 'd' on the debug console will give us an EIP on CPU 1.
> > 
> > Ian
> >
> 

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