panic: mtx_lock_spin: recursed on non-recursive mutex uart_hwmtx...

[Warner Losh]

> On Mon, 2014-01-20 at 07:36 -0800, David Wolfskill wrote:
>> panic: mtx_lock_spin: recursed on non-recursive mutex uart_hwmtx @ /usr/src/sys/dev/uart/uart_cpu.h:94
> 
> Since you mention serial console, I think r260890 might be a candidate.

I have a fix for this. I committed the wrong version of uart_core.c. r260911 should fix this. So this is broken from r260890-r260910.

Warner