From: Keir Fraser <Keir.Fraser@cl.cam.ac.uk>
To: Ryan Harper <ryanh@us.ibm.com>
Cc: Ian Pratt <m+Ian.Pratt@cl.cam.ac.uk>,
xen-devel <xen-devel@lists.xensource.com>
Subject: Re: Re: [PATCH] SMP dom0 boot fix
Date: Fri, 28 Oct 2005 16:15:12 +0100 [thread overview]
Message-ID: <db942d6187efc7983edf6dff41bc3dcd@cl.cam.ac.uk> (raw)
In-Reply-To: <20051028145930.GL22394@us.ibm.com>
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
next prev parent reply other threads:[~2005-10-28 15:15 UTC|newest]
Thread overview: 12+ messages / expand[flat|nested] mbox.gz Atom feed top
2005-10-28 1:05 [PATCH] SMP dom0 boot fix Kamble, Nitin A
2005-10-28 7:31 ` Keir Fraser
2005-10-28 14:59 ` Ryan Harper
2005-10-28 15:15 ` Keir Fraser [this message]
2005-10-28 15:45 ` Keir Fraser
2005-10-28 16:07 ` Ryan Harper
2005-10-28 17:27 ` Ky Srinivasan
-- strict thread matches above, loose matches on Subject: below --
2005-10-28 14:34 Puthiyaparambil, Aravindh
2005-10-28 17:13 Kamble, Nitin A
2005-10-28 23:52 Ian Pratt
2005-10-31 18:32 ` Ky Srinivasan
2005-10-31 18:32 ` Ky Srinivasan
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