kern/52606: cmdide transfers never finish

[martin%NetBSD.org@localhost]

>Number:         52606
>Category:       kern
>Synopsis:       cmdide transfers never finish
>Confidential:   no
>Severity:       critical
>Priority:       high
>Responsible:    kern-bug-people
>State:          open
>Class:          sw-bug
>Submitter-Id:   net
>Arrival-Date:   Mon Oct 09 10:20:00 +0000 2017
>Originator:     Martin Husemann
>Release:        NetBSD 8.99.2
>Organization:
The NetBSD Foundation, Inc.
>Environment:
System: NetBSD setting-sun.duskware.de 8.99.2 NetBSD 8.99.2 (SETTINGSUN) #1: Fri Sep 15 14:34:34 CEST 2017 martin%seven-days-to-the-wolves.aprisoft.de@localhost:/work/src/sys/arch/sparc64/compile/SETTINGSUN sparc64
Architecture: sparc64
Machine: sparc64

(can't boot the new kernel, so the above is from an older one)

>Description:

I have:

cmdide0 at pci1 dev 3 function 0: CMD Technology PCI0646 (rev. 0x03)
cmdide0: bus-master DMA support present
cmdide0: primary channel configured to native-PCI mode
cmdide0: using ivec 1820 for native-PCI interrupt
atabus0 at cmdide0 channel 0
cmdide0: secondary channel configured to native-PCI mode
atabus1 at cmdide0 channel 1
[..]
wd0 at atabus0 drive 0
wd0: <Maxtor 32049H2>
wd0: drive supports 16-sector PIO transfers, LBA addressing
wd0: 19541 MB, 39704 cyl, 16 head, 63 sec, 512 bytes/sect x 40021632 sectors
wd0: drive supports PIO mode 4, DMA mode 2, Ultra-DMA mode 5 (Ultra/100)
wd0(cmdide0:0:0): using PIO mode 4, DMA mode 2 (using DMA)
wd1 at atabus1 drive 0
wd1: <WDC WD205AA>
wd1: drive supports 16-sector PIO transfers, LBA addressing
wd1: 19569 MB, 39761 cyl, 16 head, 63 sec, 512 bytes/sect x 40079088 sectors
wd1: drive supports PIO mode 4, DMA mode 2, Ultra-DMA mode 4 (Ultra/66)
wd1(cmdide0:1:0): using PIO mode 4, DMA mode 2 (using DMA)

and the system hangs idle at mountroot(), apparently the cmdide transfers
never finish.

>How-To-Repeat:
Boot -current on a Sun U5

>Fix:
n/a