On 11/11/2016 11:47 AM, Jens Axboe wrote:
Hi,
I've been running into problems when stability testing my 4.10 branch,
and I finally got an easy reproducer today (on the laptop, no less) and
was able to bisect it. Boils down to this:
2253efc850c4cf690516bbc07854eeb1077202ba is the first bad commit
commit 2253efc850c4cf690516bbc07854eeb1077202ba
Author: Bart Van Assche <bart.vanassche@xxxxxxxxxxx>
Date: Fri Oct 28 17:20:02 2016 -0700
blk-mq: Move more code into blk_mq_direct_issue_request()
I think I see what it is - you're grabbing a request off the plug list,
and then you assume that it's the same hardware queue. That's not safe.
So you end up issuing a request from hwq A to hwq B, oops. Let me test
that theory with a patch.
--
Jens Axboe
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