panic: vm_page_free_prep: freeing mapped page

[Mark Johnston]

On Mon, Jul 15, 2019 at 07:53:43AM -0500, Larry Rosenman wrote:
> I got another panic overnight while my bacula backups were running.  
> It's
> probably postgres again.
> 
> Mark,
>     I've uploaded the dump/core.txt, info file to the same place on 
> freefall (*17*).
> 
> What else can I provide to help find this bug and eradicate it.

What's the last known good revision for this system?  That is, at what
revision was the last kernel where you didn't see the problem on this
system?