On Fri, Jul 8, 2016 at 3:28 AM, Patrick McLean <patrickm@xxxxxxxxxx> wrote:
> This is on linus git master as of 2016/07/01
>
> These appear to be two separate deadlocks, one on a a map operation,
> and one on an unmap operation. We can reproduce these pretty
> regularly, but it seems like there is some sort of race condition, as
> it happens no where near every time.
>
> We are currently working to reproduce on a kernel with lockdep
> enabled, as well as better debugging information. Please let me know
> if I can provide any more information.
I can see what happened from the traces, so no need to bother with
lockdep. Figuring out how and why is trickier...
It's a single deadlock between "rbd map" and a kworker thread, a later
"rbd unmap" is just a victim.
Are you mapping the same image more than once?
Thanks,
Ilya
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