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