Doing a bit of torture testing, I ran across a BUG in the block
subsystem (at blk-core.c:2048): the test for if the request is queued.
It turns out the trigger was a BLKPREP_KILL coming out of the SCSI prep
function. Currently for BLKPREP_KILL requests, we send them straight
into __blk_end_request_all() with an error, but they've never been
dequeued, so they trip the bug. Fix this by starting requests before
killing them.
Signed-off-by: James Bottomley <James.Bottomley@xxxxxxxxxxxxxxxxxxxxx>
---
diff --git a/block/blk-core.c b/block/blk-core.c
index 8b3b74e..9a0568c 100644
--- a/block/blk-core.c
+++ b/block/blk-core.c
@@ -1789,6 +1789,7 @@ struct request *blk_peek_request(struct request_queue *q)
break;
} else if (ret == BLKPREP_KILL) {
rq->cmd_flags |= REQ_QUIET;
+ blk_start_request(rq);
__blk_end_request_all(rq, -EIO);
} else {
printk(KERN_ERR "%s: bad return=%d\n", __func__, ret);
--
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