panic at ata-dma: transfer active on this device!

[Soren Schmidt]

It seems Dmitry Morozovsky wrote:
> Dear Soeren,
> 
> I've got almost reproducible panic at one of our machine (possibly related to
> next-to-failing disk). Backtraces from kernel dump (when kernel is able to
> re-init ata0, otherwise dump is unavailable, of course) look as follow.
> 
> System is RELENG_4_9 with
> 
> FreeBSD 4.9-RELEASE #3: Fri Nov  7 17:40:34 MSK 2003
>     marck at kucha.rinet.ru:/usr/obj/FreeBSD/src.stable-49/sys/staff
> CPU: AMD Athlon(tm) XP 1800+ (1533.40-MHz 686-class CPU)
> real memory  = 536805376 (524224K bytes)
> atapci0: <VIA 8233 ATA133 controller> port 0xe400-0xe40f at device 17.1 on pci0
> ata0: at 0x1f0 irq 14 on atapci0
> ata1: at 0x170 irq 15 on atapci0
> ad0: 39266MB <IC35L040AVER07-0> [79780/16/63] at ata0-master tagged UDMA100

Dont use tags, it was apparently severely broken by the PAE integration.

-Søren