From mboxrd@z Thu Jan 1 00:00:00 1970
From: bugzilla-daemon@bugzilla.kernel.org
Subject: [Bug 90601] panic on write to 3ware raid array
Date: Mon, 05 Jan 2015 09:17:03 +0000
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https://bugzilla.kernel.org/show_bug.cgi?id=90601
kashyap changed:
What |Removed |Added
----------------------------------------------------------------------------
CC| |kashyap.desai@lsi.com
--- Comment #3 from kashyap ---
Merlin,
1.)
Can you enable CONFIG_DMA_API_DEBUG in your kernel conf and send complete
/var/log/messages along with back trace.
2.)
>>From existing logs I can figure out that crash happened at below place.
static void intel_unmap_sg(struct device *dev, struct scatterlist *sglist,
int nelems, enum dma_data_direction dir,
struct dma_attrs *attrs)
{
intel_unmap(dev, sglist[0].dma_address);
}
sglist[0] is NULL and while accessing dma_address (which is 0x10th index as per
below definition)
struct scatterlist {
#ifdef CONFIG_DEBUG_SG
unsigned long sg_magic;
#endif
unsigned long page_link;
unsigned int offset;
unsigned int length;
dma_addr_t dma_address; < -- 0x10th index
#ifdef CONFIG_NEED_SG_DMA_LENGTH
unsigned int dma_length;
#endif
};
Crash detail -
[ 1005.899543] Hardware name: Supermicro X9DR7/E-(J)LN4F/X9DR7/E-(J)LN4F, BIOS
3.0a 09/10/2013
[ 1005.899971] task: ffffffff8160a460 ti: ffffffff815f4000 task.ti:
ffffffff815f4000
[ 1005.900401] RIP: 0010:[] []
intel_unmap_sg+0x1/0x10
~ kashyap
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