Re: kernel panic with 2.5.67-ac1

From: Christian Staudenmayer (
Date: Fri Apr 18 2003 - 17:15:52 EST


as i mentioned, the panic also appears in 2.5.67-ac2, just in a slightly different
variant. However, the fix from bk8 you mentioned _is_ in 2.5.67-ac2 (or at least
the snippit of code that you posted).
So this probably isn't the problem here, is it?

Thanks in advance,
Christian Staudenmayer

--- Patrick Mansfield <> wrote:
> On Fri, Apr 18, 2003 at 10:18:06AM -0700, Christian Staudenmayer wrote:
> > Note: this does not happen with 2.4.20, 2.4.21-pre7, 2.4.21-pre7-ac1 or 2.5.67-bk8
> > It does, however happen with 2.5.67-ac2, but the error message is some lines longer
> > and some of the addresses have changed.
> >
> > I'd be really grateful for any insight on this problem.
> We were plugging a queue that was about to be freed during scsi scan.
> This is fixed in bk8, here is a snippit of part of the patch to scsi_lib.c
> that fixed the problem, or look at the end of scsi_prep_fn, (plus the
> corresponding call to blk_plug_device was removed from scsi_request_fn):
> + defer:
> + /* If we defer, the elv_next_request() returns NULL, but the
> + * queue must be restarted, so we plug here if no returning
> + * command will automatically do that. */
> + if (sdev->device_busy == 0)
> + blk_plug_device(q);
> + return BLKPREP_DEFER;
> +}
> -- Patrick Mansfield

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