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SubjectRe: [BUG] panic after umount (biscted)
* Jens Axboe | 2007-10-26 11:32:42 [+0200]:

>On Fri, Oct 26 2007, Jens Axboe wrote:
>> >
>> > I hope this was usefull. Now, I'm going to rebuild my raid now....
>> >
>> Thanks a lot, a full report on this issue. Will get this fixed up asap.
No problem, thanks for working on that :)

>
>Does this work?
>
>diff --git a/drivers/scsi/scsi_lib.c b/drivers/scsi/scsi_lib.c
>index 61fdaf0..cf47fcb 100644
>--- a/drivers/scsi/scsi_lib.c
>+++ b/drivers/scsi/scsi_lib.c
>@@ -1115,6 +1115,8 @@ static int scsi_init_io(struct scsi_cmnd *cmd)
> * kmapping pages)
> */
> cmd->use_sg = req->nr_phys_segments;
>+ if (!cmd->use_sg)
>+ return 0;
>
> /*
> * If sg table allocation fails, requeue request later.
>@@ -1191,7 +1193,7 @@ int scsi_setup_blk_pc_cmnd(struct scsi_device *sdev, struct request *req)
> if (req->bio) {
> int ret;
>
>- BUG_ON(!req->nr_phys_segments);
>+ BUG_ON(!req->nr_phys_segments && req->bio->bi_size);
>
> ret = scsi_init_io(cmd);
> if (unlikely(ret))
>

Nope. I get [1] on manual umount and [2] on system reboot. This is
24-rc1 with this patch on top.

[1] http://download.breakpoint.cc/bug/bug_rc1_patch_manual.jpeg 163 KiB
[2] http://download.breakpoint.cc/bug/bug_rc1_patch_reboot.jpeg 171 KiB
>--
>Jens Axboe

Sebastian
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