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Re: [Xen-devel] Re: Bug#638172: BUG: soft lockup - CPU#0 stuck for 61s! [qemu-dm:3205]

On Mon, Aug 22, 2011 at 10:00:11AM +0100, Ian Campbell wrote:
> @xen-devel:
> Does this look familiar to anyone, this is (I expect, hopefully Giuseppe
> will confirm) from Debian Squeeze which has a Xen 4.0.x with a PVops
> dom0 kernel based on xen.git from last summer (e73f4955a821) with more
> recent upstream longterm kernels (up to and including merged
> in. While it does seem to have the switch from level to edge triggered
> interrupt the Debian kernel doesn't appear to have the switch to fasteoi
> for pirqs (0672fb44a111 plus a few followups) -- could that be related
> to this? (I'm not sure if that was a cleanup or a fix)

It was a fix. We had some interrupts getting wedged - but I don't recall
the stack exactly. But there are some follows - like

> Might the tsc unstable message be relevant?

Hm, not sure. I keep on getting those on my guests but life seems to go on.

The interesting about the stack trace is that it looks similiar to:


which has some fixes https://patchwork.kernel.org/patch/1091772/
but they may not help.

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