* Keir Fraser <Keir.Fraser@xxxxxxxxxxxx> [2005-10-28 10:41]:
>
> 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.
That fixed it for me here. Thanks!
--
Ryan Harper
Software Engineer; Linux Technology Center
IBM Corp., Austin, Tx
(512) 838-9253 T/L: 678-9253
ryanh@xxxxxxxxxx
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