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Message-ID: <20071027104436.GA19482@Chamillionaire.breakpoint.cc>
Date: Sat, 27 Oct 2007 12:44:36 +0200
From: Sebastian Siewior <lkml@...breakpoint.cc>
To: Jens Axboe <jens.axboe@...cle.com>
Cc: linux-kernel@...r.kernel.org
Subject: Re: [BUG] panic after umount (biscted)
* Jens Axboe | 2007-10-26 13:42:30 [+0200]:
>> [2] http://download.breakpoint.cc/bug/bug_rc1_patch_reboot.jpeg 171 KiB
>
>Ah, second BUG() for same issue. Try this one. This?
>
>diff --git a/drivers/scsi/scsi_lib.c b/drivers/scsi/scsi_lib.c
>index 61fdaf0..57fde7b 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))
>@@ -1236,9 +1238,10 @@ int scsi_setup_fs_cmnd(struct scsi_device *sdev, struct request *req)
> if (ret != BLKPREP_OK)
> return ret;
> /*
>- * Filesystem requests must transfer data.
>+ * Filesystem requests must transfer data, unless it's an empty
>+ * barrier.
> */
>- BUG_ON(!req->nr_phys_segments);
>+ BUG_ON(!req->nr_phys_segments && !bio_empty_barrier(req->bio));
>
> cmd = scsi_get_cmd_from_req(sdev, req);
> if (unlikely(!cmd))
>
I'm afraid you did not make it to the next level. I hope you have
another man :). [1] shows the result. I double checked it, it seems to
be the same bug() with the second patch.
[1] http://download.breakpoint.cc/bug/bug_patch2.jpeg 134 KiB
>Jens Axboe
Sebastian
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