just as an additional datapoint. My 5.0-current system panics
during boot when I enable tagged queing.
This did not happen with a system built on March 16th, but there
have been numerous changes on the ata-subsystem inbetween and I was
not able to trace this down to a specific change.

The trace looks like this (this is just handwritten)

ad_service (e5217c00,1,12788100,0,0) +0x36
ad_transfer (e51fcdc0)

The panic appears right when the disks should be attached.
This happens with a GENERIC kernel too!

This is a dmesg output without tagging:

Copyright (c) 1992-2002 The FreeBSD Project.
Copyright (c) 1979, 1980, 1983, 1986, 1988, 1989, 1991, 1992, 1993, 1994
        The Regents of the University of California. All rights reserved.
FreeBSD 5.0-CURRENT #0: Sun Apr 14 09:29:41 MEST 2002
    [EMAIL PROTECTED]:/usr/src/sys/i386/compile/MCSMP2
Preloaded elf kernel "/boot/kernel/kernel" at 0xc0523000.
Preloaded elf module "/boot/kernel/acpi.ko" at 0xc05230a8.
Timecounter "i8254"  frequency 1193182 Hz
CPU: Pentium III/Pentium III Xeon/Celeron (996.55-MHz 686-class CPU)
  Origin = "GenuineIntel"  Id = 0x68a  Stepping = 10
real memory  = 1073676288 (1048512K bytes)
avail memory = 1038569472 (1014228K bytes)
Programming 24 pins in IOAPIC #0
IOAPIC #0 intpin 2 -> irq 0
FreeBSD/SMP: Multiprocessor System Detected: 2 CPUs
 cpu0 (BSP): apic id:  0, version: 0x00040011, at 0xfee00000
 cpu1 (AP):  apic id:  1, version: 0x00040011, at 0xfee00000
 io0 (APIC): apic id:  2, version: 0x00178011, at 0xfec00000
Pentium Pro MTRR support enabled
Using $PIR table, 8 entries at 0xc00f7570
npx0: <math processor> on motherboard
npx0: INT 16 interface
acpi0: <AMIINT > on motherboard
acpi0: power button is handled as a fixed feature programming model.
Timecounter "ACPI-fast"  frequency 3579545 Hz
acpi_timer0: <24-bit timer at 3.579545MHz> port 0x808-0x80b on acpi0
acpi_cpu0: <CPU> on acpi0
acpi_cpu1: <CPU> on acpi0
acpi_tz0: <thermal zone> on acpi0
acpi_button0: <Power Button> on acpi0
acpi_pcib0: <Host-PCI bridge> port 0xcf8-0xcff on acpi0
pci0: <PCI bus> on acpi_pcib0
agp0: <VIA 82C691 (Apollo Pro) host to PCI bridge> mem 0xe0000000-0xe3ffffff at device 
0.0 on pci0
pcib1: <PCI-PCI bridge> at device 1.0 on pci0
pci1: <PCI bus> on pcib1
pci1: <display, VGA> at device 0.0 (no driver attached)
isab0: <PCI-ISA bridge> at device 7.0 on pci0
isa0: <ISA bus> on isab0
atapci0: <VIA 82C686 ATA100 controller> port 0xffa0-0xffaf at device 7.1 on pci0
ata0: at 0x1f0 irq 14 on atapci0
ata1: at 0x170 irq 15 on atapci0
uhci0: <VIA 83C572 USB controller> port 0xcc00-0xcc1f irq 10 at device 7.2 on pci0
usb0: <VIA 83C572 USB controller> on uhci0
usb0: USB revision 1.0
uhub0: VIA UHCI root hub, class 9/0, rev 1.00/1.00, addr 1
uhub0: 2 ports with 2 removable, self powered
ums0: KYE Genius USB Wheel Mouse, rev 1.00/0.00, addr 2, iclass 3/1
ums0: 3 buttons and Z dir.
ulpt0: Hewlett-Packard DeskJet 990C, rev 1.10/1.00, addr 3, iclass 7/1
ulpt0: using bi-directional mode
uhci1: <VIA 83C572 USB controller> port 0xd800-0xd81f irq 10 at device 7.3 on pci0
usb1: <VIA 83C572 USB controller> on uhci1
usb1: USB revision 1.0
uhub1: VIA UHCI root hub, class 9/0, rev 1.00/1.00, addr 1
uhub1: 2 ports with 2 removable, self powered
pci0: <serial bus, SMBus> at device 7.4 (no driver attached)
xl0: <3Com 3c905B-TX Fast Etherlink XL> port 0xc800-0xc87f mem 0xdffffe80-0xdffffeff 
irq 12 at device 9.0 on pci0
xl0: Ethernet address: 00:10:5a:d7:dd:9c
miibus0: <MII bus> on xl0
xlphy0: <3Com internal media interface> on miibus0
xlphy0:  10baseT, 10baseT-FDX, 100baseTX, 100baseTX-FDX, auto
pcm0: <Creative EMU10K1> port 0xc400-0xc41f irq 9 at device 10.0 on pci0
bktr0: <BrookTree 878> mem 0xdedfe000-0xdedfefff irq 10 at device 11.0 on pci0
bktr0: Hauppauge Model 61344 D121
bktr0: Detected a MSP3410D-B4 at 0x80
bktr0: Hauppauge WinCast/TV, Philips FR1216 PAL FM tuner, msp3400c stereo, remote 
pci0: <multimedia> at device 11.1 (no driver attached)
sym0: <875> port 0xd000-0xd0ff mem 0xdfffe000-0xdfffefff,0xdfffff00-0xdfffffff irq 11 
at device 12.0 on pci0
sym0: Symbios NVRAM, ID 7, Fast-20, SE, parity checking
sym0: open drain IRQ line driver, using on-chip SRAM
sym0: using LOAD/STORE-based firmware.
sym0: SCAN FOR LUNS disabled for targets 0 1 2 3 4 5 6 8 9 10 11 12 13 14 15.
acpi_button1: <Sleep Button> on acpi0
atkbdc0: <Keyboard controller (i8042)> port 0x64,0x60 irq 1 on acpi0
atkbd0: <AT Keyboard> flags 0x1 irq 1 on atkbdc0
kbd0 at atkbd0
fdc0: <enhanced floppy controller (i82077, NE72065 or clone)> port 0x3f7,0x3f2-0x3f5 
irq 6 drq 2 on acpi0
fdc0: FIFO enabled, 8 bytes threshold
fd0: <1440-KB 3.5" drive> on fdc0 drive 0
sio0 port 0x3f8-0x3ff irq 4 on acpi0
sio0: type 16550A
sio1 port 0x2f8-0x2ff irq 3 on acpi0
sio1: type 16550A
ppc0 port 0x778-0x77b,0x378-0x37f irq 7 drq 3 on acpi0
ppc0: SMC-like chipset (ECP/EPP/PS2/NIBBLE) in COMPATIBLE mode
ppc0: FIFO with 16/16/8 bytes threshold
lpt0: <Printer> on ppbus0
lpt0: Interrupt-driven port
orm0: <Option ROM> at iomem 0xc0000-0xc7fff on isa0
sc0: <System console> at flags 0x100 on isa0
sc0: VGA <16 virtual consoles, flags=0x300>
vga0: <Generic ISA VGA> at port 0x3c0-0x3df iomem 0xa0000-0xbffff on isa0
APIC_IO: Testing 8254 interrupt delivery
APIC_IO: routing 8254 via IOAPIC #0 intpin 2
IPv6 packet filtering initialized, default to accept, unlimited logging
IP packet filtering initialized, divert enabled, rule-based forwarding enabled, 
default to accept, unlimited logging
IPsec: Initialized Security Association Processing.
acpi_cpu: CPU throttling enabled, 16 steps from 100% to 6.2%

--> at this point I am getting the panic with tagging enabled!

ad0: 32634MB <IBM-DPTA-373420> [66305/16/63] at ata0-master UDMA66
ad1: 43979MB <IBM-DTLA-307045> [89355/16/63] at ata0-slave UDMA100
ad2: 32634MB <IBM-DPTA-373420> [66305/16/63] at ata1-master UDMA66
Waiting 2 seconds for SCSI devices to settle
(noperiph:sym0:0:-1:-1): SCSI BUS reset delivered.
sa0 at sym0 bus 0 target 4 lun 0
sa0: <HP C1533A A708> Removable Sequential Access SCSI-2 device
sa0: 10.000MB/s transfers (10.000MHz, offset 16)
pass0 at sym0 bus 0 target 2 lun 0
pass0: <UMAX Astra 1200S V2.9> Fixed Scanner SCSI-2 device
pass0: 3.300MB/s transfers
Mounting root from ufs:/dev/ad0s4a
SMP: AP CPU #1 Launched!
cd0 at sym0 bus 0 target 3 lun 0
cd0: <PIONEER DVD-ROM DVD-304F 1.03> Removable CD-ROM SCSI-2 device
cd0: 20.000MB/s transfers (20.000MHz, offset 16)
cd0: Attempt to query device size failed: NOT READY, Medium not present
/dev/vmmon: Module vmmon: registered with major=200 minor=0 tag=$Name: build-570 $
/dev/vmmon: Module vmmon: initialized
xl0: promiscuous mode enabled
vmnet1: promiscuous mode enabled
cd1 at sym0 bus 0 target 5 lun 0
cd1: <YAMAHA CRW8424S 1.0j> Removable CD-ROM SCSI-2 device
cd1: 10.000MB/s transfers (10.000MHz, offset 15)
cd1: Attempt to query device size failed: NOT READY, Medium not present - tray closed

On Sun, 14 Apr 2002, Alexander Leidinger wrote:

> On 14 Apr, David W. Chapman Jr. wrote:
> > I updated to -current today and am now getting these errors
> >
> > ad0: READ command timeout tag=1 serv=1 - resetting
> > ata0: resetting devices .. ad0: invalidating queued requests
> > done
> Turn off tagged queing. Søren knows about this error and tries to
> reproduce it (but fails as far as I know).
> Bye,
> Alexander.
        michael class, viktor-renner str. 39, 72074 tuebingen, frg
                    E-Mail: [EMAIL PROTECTED]
         Phone: +49 7031 14-3707 (work) +49 7071 81950 (private)

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