Messages in this thread |  | | Date | Mon, 17 Sep 2001 00:01:31 -0400 | From | Douglas Gilbert <> | Subject | Re: OOPS in scsi generic stuff 2.4.10-pre6 |
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Jens Axboe wrote: > > On Sun, Sep 16 2001, Jens Axboe wrote: > > It looks like a race in that sg_cmd_done_bh can be completed before > > generic_unplug_device is called (and thus on a free'd scsi request). We > > then pass an invalid queue to generic_unplug_device. > > (corrected version, scsi_allocate_request can of course fail)
Jens, Prior to this patch (actually the first one you posted today) sg_dd would frequently crash in generic_unplug_device when tested against the scsi_debug adapter driver. [I have hacked up that driver to simulate a large number of (ram) disks to test Richard Gooch's 2000+ scsi disk patch.]
The way scsi_debug handles all its commands, the bottom half handler in sg will be called before scsi_do_req() completes. With this patch the problem goes away.
Doug Gilbert
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