panic: kern/52718

[Terry Lambert]

Bryan Liesner wrote:
> 
> Is anyone going to look at this before the next release?
> Of course, if more info is needed, I'll send it along.  No dump is
> available - it panics during boot.
> 
> http://www.freebsd.org/cgi/query-pr.cgi?pr=52718

This was caused by rev. 1.3 of a commit by Jeff Robertson to
kern_utmx.c.  The problem is that the proc struct is not locked
for:

        FOREACH_THREAD_IN_PROC(td->td_proc, td0)

in the lock and unlock.

Either lock the proc before and unlock it after this, in both
_utmx_lock() and _utmx_unlock(), or revert the code to 1.2.

It's pretty simple.  No one needs t look at it, all they need
to do is act on information already present.

-- Terry