The following reply was made to PR kern/32473; it has been noted by GNATS.

From: Ben Collver <collver@peak.org>
To: "Mike M. Volokhov" <mishka@intostroy.com>, gnats-bugs@netbsd.org
Cc: Zbigniew Baniewski <zb@ispid.com.pl>, netbsd-users@NetBSD.org,
	tech-kern@NetBSD.org
Subject: Re: kern/32473: GUS PnP audio device seem to be broken in NetBSD 3.0
Date: Thu, 13 Apr 2006 20:04:24 -0700

 On Mon, Apr 10, 2006 at 06:07:29PM +0300, Mike M. Volokhov wrote:
 > Heh, unfortunately, I'm not device drivers expert (so please correct me
 > please, if I'm wrong), but looking to your backtrace, seems something
 > introduced by Tamura Kent in rev 1.24 (2005/01/10, kent-audio1 branch)
 > to Interwave driver (sys/dev/ic/interwave.c) was not smooth. Possible
 > easiest way to check it (Ben?) is testing kernels from 2005/01/09, and
 > then from 2005/01/11. If problem would not occurs on first, and would
 > existent on second, I'm right.
 > 
 > Such way we can find responsible (in this case Kent) for this problem.
 > Could you do this, please?
 
 I was not able to build -current from 20050109.
 
 I reproduced the problem in NetBSD 2.0, and the backtrace looks pretty
 much the same as the 3.0 backtrace.  Since this release pre-dates Tamura
 Kent's changes, I am guessing he is not responsible for the problem.
 
 The error message I get is:
 
 isa0: dma start on free channel 5
 panic: _isa_dmastart
 Stopped in pid 526.1 (audioplay) at   netbsd:cpu_Debugger+0x4:   leave
 db>
 
 The dmesg follows:
 
 NetBSD 2.0 (GENERIC) #0: Mon Dec 13 10:03:52 PST 2004
 	ben@sanctum:/usr/ben/objdir/sys/arch/i386/compile/GENERIC
 total memory = 32380 KB
 avail memory = 23968 KB
 BIOS32 rev. 0 found at 0xfd960
 mainbus0 (root)
 cpu0 at mainbus0: (uniprocessor)
 cpu0: Intel Pentium (P54C) (586-class), 132.96 MHz, id 0x52c
 cpu0: features 1bf<FPU,VME,DE,PSE,TSC,MSR,MCE,CX8>
 pci0 at mainbus0 bus 0: configuration mode 1
 pci0: i/o space, memory space enabled, rd/line, rd/mult, wr/inv ok
 pchb0 at pci0 dev 0 function 0
 pchb0: Intel 82437VX System Controller (TVX) (rev. 0x02)
 pcib0 at pci0 dev 7 function 0
 pcib0: Intel 82371SB PCI-to-ISA Bridge (PIIX3) (rev. 0x01)
 piixide0 at pci0 dev 7 function 1
 piixide0: Intel 82371SB IDE Interface (PIIX3) (rev. 0x00)
 piixide0: bus-master DMA support present
 piixide0: primary channel wired to compatibility mode
 piixide0: primary channel interrupting at irq 14
 atabus0 at piixide0 channel 0
 piixide0: secondary channel wired to compatibility mode
 piixide0: secondary channel ignored (disabled)
 S3 Trio32/64 (VGA display, revision 0x44) at pci0 dev 8 function 0 not configured
 vga1 at pci0 dev 13 function 0: Nvidia Corporation & SGS-Thomson Microelectronics Riva 128 (rev. 0x10)
 wsdisplay0 at vga1 kbdmux 1: console (80x25, vt100 emulation)
 wsmux1: connecting to wsdisplay0
 ohci0 at pci0 dev 14 function 0: Opti RM861HA (rev. 0x10)
 ohci0: interrupting at irq 11
 ohci0: OHCI version 1.0, legacy support
 usb0 at ohci0: USB revision 1.0
 uhub0 at usb0
 uhub0: Opti OHCI root hub, class 9/0, rev 1.00/1.00, addr 1
 uhub0: 2 ports with 2 removable, self powered
 isa0 at pcib0
 lpt0 at isa0 port 0x378-0x37b irq 7
 com0 at isa0 port 0x3f8-0x3ff irq 4: ns16550a, working fifo
 pckbc0 at isa0 port 0x60-0x64
 pckbd0 at pckbc0 (kbd slot)
 pckbc0: using irq 1 for kbd slot
 wskbd0 at pckbd0: console keyboard, using wsdisplay0
 pms0 at pckbc0 (aux slot)
 pckbc0: using irq 12 for aux slot
 wsmouse0 at pms0 mux 0
 pcppi0 at isa0 port 0x61
 midi0 at pcppi0: PC speaker
 sysbeep0 at pcppi0
 isapnp0 at isa0 port 0x279: ISA Plug 'n Play device support
 npx0 at isa0 port 0xf0-0xff: using exception 16
 fdc0 at isa0 port 0x3f0-0x3f7 irq 6 drq 2
 isapnp0: read port 0x203
 guspnp0 at isapnp0 port 0x220/16,0x320/8,0x32c/4 irq 7,5 drq 7,5
 guspnp0: Gravis Ultrasound Plug'n'Pray WSS & GUS EMU
 guspnp0: bank[0]: 0K, bank[1]: 0K, bank[2]: 0K, bank[3]: 0K
 guspnp0: interwave version 1.26
 audio0 at guspnp0: full duplex, mmap
 isapnp0: <Gravis Ultrasound Plug'n'Pray, GRV0011, , Disabled[IDE Co> not configured
 joy0 at isapnp0 port 0x201/1
 joy0: Gravis Ultrasound Plug'n'Pray Game Port
 joy0: joystick not connected
 isapnp0: <Gravis Ultrasound Plug'n'Pray, GRV0013, , Disabled[SB & O> not configured
 isapnp0: <Gravis Ultrasound Plug'n'Pray, GRV0014, , Disabled[GM EMU> not configured
 fd0 at fdc0 drive 0: 1.44MB, 80 cyl, 2 head, 18 sec
 Kernelized RAIDframe activated
 wd0 at atabus0 drive 0: <WDC AC21600H>
 wd0: drive supports 16-sector PIO transfers, LBA addressing
 wd0: 1549 MB, 3148 cyl, 16 head, 63 sec, 512 bytes/sect x 3173184 sectors
 wd0: 32-bit data port
 wd0: drive supports PIO mode 4, DMA mode 2
 wd0(piixide0:0:0): using PIO mode 4, DMA mode 2 (using DMA data transfers)
 boot device: wd0
 root on wd0a dumps on wd0b
 root file system type: ffs
 wsdisplay0: screen 1 added (80x25, vt100 emulation)
 wsdisplay0: screen 2 added (80x25, vt100 emulation)
 wsdisplay0: screen 3 added (80x25, vt100 emulation)
 wsdisplay0: screen 4 added (80x25, vt100 emulation)