On Mon, Nov 21, 2011 at 07:27:45PM +1100, NeilBrown wrote:

On Mon, 21 Nov 2011 08:04:30 +0100 James Bottomley
[off-list ref] wrote:

quoted

On Mon, 2011-11-21 at 12:37 +1100, NeilBrown wrote:

quoted

Thank for the report.
However as this crash is clearly in the SCSI layer it makes sense to reported
it to linux-scsi - so I have cc:ed this reply there.

On Sat, 19 Nov 2011 14:41:39 +0100 Michał Mirosław [off-list ref]
wrote:

quoted

I get following BUG_ON tripped while booting, before rootfs is mounted by
Debian's initrd. This started to happen for kernels since sometime
during 3.1-rcX.

[    6.246170] ------------[ cut here ]------------
[    6.246246] kernel BUG at /mnt/src-tmp/jaja/git/qmqm/drivers/scsi/scsi_lib.c:1153!

I can tell you what it is:

        /*
         * Filesystem requests must transfer data.
         */
        BUG_ON(!req->nr_phys_segments);

But the fault is in the layer above SCSI.  It means something sent a
request with REQ_TYPE_FS but no actual data attached ... this is
supposed to be impossible, hence the bug on.

Thanks.... that sounds strangely familiar, but I cannot be sure and google
doesn't help.

Michał: what are you using on the RAID1 - some filesystem (which one)or swap or something else?

The whole stack is: ext4 over lvm over dm-crypt over md-raid1 over SATA
drives.  The boot doesn't survive to the point where the initrd script asks
for md-crypt's key password.

Best Regards,
Michał Mirosław
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