Boot panic w/7.2-STABLE on amd64: resource_list_alloc

[Bruce Simpson]

Bruce Simpson wrote:
> Since upgrading sources on RELENG_7 yesterday, my amd64 system panics 
> right after this line in dmesg:
>
> ata4: <ATA channel 2> on atapci1
> panic: resource_list_alloc: resource entry is busy
> ...
> I see there have recently been commits in this area which may have 
> broken ATA driver support in some subtle way.

Rolling back SVN rev 192033 by hand makes no difference.
The controller is an AcerLabs M5287 SATA150 controller.

Has anyone else seen a similar boot panic?

thanks,
BMS