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    SubjectRe: block/bsg.c
    On Tue, 2007-07-17 at 15:54 -0700, Andrew Morton wrote:
    > On Tue, 17 Jul 2007 17:19:15 -0500
    > James Bottomley <> wrote:
    > > > Adding 1020116k swap on /dev/hdc3. Priority:-1 extents:1 across:1020116k
    > > > generic_ide_ioctl: cmd=21382
    > > > generic_ide_ioctl: err=0
    > > > generic_ide_ioctl: cmd=1
    > > > program scsi_unique_id is using a deprecated SCSI ioctl, please convert it to SG_IO
    > >
    > > I can tell you what went wrong:
    > >
    > > This cmd=1 is SCSI_IOCTL_SEND_COMMAND, but that doesn't seem to be
    > > what's intended ... I'm guessing it's a legacy ide ioctl value which
    > > suddenly has become interpreted as a scsi_ioctl ... and certainly a non
    > > CD IDE device cannot handle a SCSI command, so all hell breaks loose.
    > An interrupt-off lockup is a pretty bad reaction to an unexpected ioctl
    > command. It makes one wonder if tht lockup can be triggered by other means...

    I think this is pretty much par for the course for IDE drivers ... send
    it a bogus taskfile (which root is allowed to do) and you'll see it
    exhibit the same behaviour. I suspect what happened is that the driver
    expects to treat all REQ_BLOCK_PC requests as taskfiles, so the
    wrappered SCSI command got treated as a task file ... the rest you know.


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