SSD on Thinkpad x250 sometimes double-detected

Matthew Dillon dillon at
Fri Mar 23 21:34:40 PDT 2018

Hmm.   That bug was supposed to have been fixed a while ago... like a few
months.  But if not, there's more to it and we have to track it down.  A
double 'da0' is typically due to a unit allocation race.  i.e. two ahci
channels allocate their da* units at the same time without the correct lock.

I will look at the code paths again and try to figure out why it might
still be happening.


On Fri, Mar 23, 2018 at 1:15 AM, Daniel Bilik <ddb at> wrote:

> On Fri, 23 Mar 2018 09:52:50 +0200
> "M. L. Wilson" <ipc at> wrote:
> > I had a similar issue some weeks ago. I could not really track down the
> > real culprit but your description and dmesg output were similar to mine.
> > Somehow, a full world/kernel rebuild solved the issue as I have not seen
> > it again.
> Thank you for responding... As I've written, I am on master, and I always
> do full buildworld+buildkernel when upgrading. Currently I run...
> 5.1-DEVELOPMENT DragonFly v5.1.0.1073.g51a52-DEVELOPMENT #0: Mon Mar 19
> 11:11:20 CET 2018
> ... and with this kernel I've hit the issue this week. Thus my previous
> question, whether there was some commit between 10th March and today that
> could have fixed it.
> --
>                                                 Daniel
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