linux-kernel - BUG in drivers/dma/ioat/dma

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Date:	Mon, 28 Jun 2010 16:50:05 -0700
From:	Chris Li <lkml@...isli.org>
To:	Dan Williams <dan.j.williams@...el.com>
Cc:	linux-kernel <linux-kernel@...r.kernel.org>
Subject: BUG in drivers/dma/ioat/dma_v2.c:314

Hi Dan,

My Mac Pro hit this BUG every time it try to load module ioatdma.

This was first discover in FC 12 & 13 kernel. See redhat bug 605845.
https://bugzilla.redhat.com/show_bug.cgi?id=605845. I attach a picture
of the kernel panic on the bug.

The current git tree has it as well. The bug line number change a
little bit though.

		/* when halted due to errors check for channel
		 * programming errors before advancing the completion state
		 */
		if (is_ioat_halted(status)) {
			u32 chanerr;

			chanerr = readl(chan->reg_base + IOAT_CHANERR_OFFSET);
			dev_err(to_dev(chan), "%s: Channel halted (%x)\n",
				__func__, chanerr);
			BUG_ON(is_ioat_bug(chanerr)); <---------------------------------
		}

The machine is a Mac Pro. The bug is reproducible 100%. Black list the
ioatdma module and the kernel boot just fine.

Any suggestion? I am not afraid to try out patches.

Thanks

Chris
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