Re: raid1d crash at boot

["Michał Mirosław" <mirq-linux@rere.qmqm.pl>]

On Mon, Nov 21, 2011 at 07:27:45PM +1100, NeilBrown wrote:
> On Mon, 21 Nov 2011 08:04:30 +0100 James Bottomley
> <James.Bottomley@HansenPartnership.com> wrote:
> > On Mon, 2011-11-21 at 12:37 +1100, NeilBrown wrote:
> > > 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 <mirq-linux@rere.qmqm.pl>
> > > wrote:
> > > > 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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