5.2-RELEASE panic in turnstile_wait

[Don Lewis]

On 29 Jan, Erik Moe wrote:
> How long has this been an issue?  Was this a problem in 5.1-RELEASE as well,
> because I had a few mysterious panics in 5.1 where it look like there was
> memory corruption.

I'm not familiar with the history of the code in question, but I think
the problem has been there quite a while.  I saw the first report of the
problem last November, and it took quite some time to trace it to the
vchan code.