Re: BUG: unable to handle kernel NULL pointer deref, bisected to 746650160

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On Mon, 13 Apr 2015 19:41:05 +0200
Christoph Hellwig <hch@xxxxxx> wrote:

> Can you run gdb on your vmlinux file and send the output of the
> following command in gdb
> 
> l *(scsi_dma_unmap+0x54)

Thanks for looking into it! Here is what gdb says:

Reading symbols
from /opt/kvm/bisect/vmlinux-3.16.0-74665016086615bb+...done.
(gdb) l *(scsi_dma_unmap+0x54)
0xffffffff8146a0b4 is in scsi_dma_unmap
(drivers/scsi/scsi_lib_dma.c:50).
45 struct device *dev = cmd->device->host->dma_dev;
46
47 dma_unmap_sg(dev, scsi_sglist(cmd), scsi_sg_count(cmd),
48 cmd->sc_data_direction);
49		}
50	}
51	EXPORT_SYMBOL(scsi_dma_unmap);

Regards,
Torsten
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