[issue530] crash from latest -HEAD

[Peter Avalos]

On Thu, Mar 08, 2007 at 08:55:24AM -0800, Matthew Dillon wrote:
>     I think this is the second time this panic has been reported.

Indeed.  If you look at issue530, you'll see the entire trail.

>     Here is a patch that will kprintf() pages that I think are causing the
>     problem.  If we get this just before a similar crash, and its the
>     same page as the one that the pageout code crashed on (The %esi 
>     register in the trapframe points to the vm_page in the crash), then
>     we will have found it.
> 
>     Think you can reproduce it?  It looks like the issue might be related
>     to page wiring or a program being terminated while undergoing paging I/O.

I've compiled up a new kernel with that patch, so we'll see.  The first time it
happened only after 13 hours of uptime.  The second time took 35 days.  If you
have any suggestions on how to trigger it, I'll see what I can do.

--Peter
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