Re: [Xen-devel] Re: [PATCH] SMP dom0 boot fix

[Keir Fraser <Keir.Fraser@xxxxxxxxxxxx>]

On 28 Oct 2005, at 16:15, Keir Fraser wrote:

> On 28 Oct 2005, at 15:59, Ryan Harper wrote:
>
> > At this point send_IPI_allbutself() has been invoked and the system
> > just sits and waits on CPU1 to run the function.  But, CPU1's
> > evtchn_upcall_mask was set (1), so I'm guessing the pending interrupt
> > is never acknowledged.
> Okay, the good news is that's the same bug I was able to repro last 
> week. Turns out that CPU1's upcall mask is getting weirdly set under 
> its feet. Since it's waiting on the big kernel lock, which is held by 
> CPU0, which is waiting for acknowledgement of an interrupt in CPU1, we 
> have a deadlock.
> Given the problem is in that one changeset, this can't be hard to 
> track down now.
Now fixed in our staging tree. sizeof_vcpu_shift in 
arch/xen/x86_64/xen_entry.S should be 4, not 3.
 -- Keir


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