I'm not sure whether it's related to ata driver, but starting from several days
ago (my previous kernel was from 30 January) my kernel panices on every more or
less active ad0 usage (for example, dd if=/dev/ad0 of=/dev/null kills it
perfectly). The system in question is Toshiba Satellite Pro 445CDX with
isa-based ATA controller. Following is relevant dmesg, kernel config and
backtrace of crash dump.

Copyright (c) 1992-2001 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 Feb 11 02:05:32 EET 2001
Timecounter "i8254"  frequency 1193136 Hz
CPU: Pentium/P55C (132.63-MHz 586-class CPU)
  Origin = "GenuineIntel"  Id = 0x543  Stepping = 3
real memory  = 33685504 (32896K bytes)
avail memory = 29745152 (29048K bytes)
Preloaded elf kernel "kernel" at 0xc0302000.
Preloaded elf module "snd_pcm.ko" at 0xc030209c.
Preloaded elf module "snd_mss.ko" at 0xc030213c.
Intel Pentium detected, installing workaround for F00F bug
VESA: v2.0, 2048k memory, flags:0x0, mode table:0xc0293d20 (1000040)
VESA: CHIPS 6x554 Super VGA
apm0: <APM BIOS> on motherboard
apm0: found APM BIOS v1.2, connected at v1.2
npx0: <math processor> on motherboard
npx0: INT 16 interface
isa0: <ISA bus> on motherboard
ata0 at port 0x1f0-0x1f7,0x3f6 irq 14 on isa0
ata1 at port 0x170-0x177,0x376 irq 15 on isa0
atkbdc0: <Keyboard controller (i8042)> at port 0x60,0x64 on isa0
atkbd0: <AT Keyboard> irq 1 on atkbdc0
psm0: <PS/2 Mouse> irq 12 on atkbdc0
psm0: model GlidePoint, device ID 0
fdc0: <NEC 765 or clone> at port 0x3f0-0x3f5,0x3f7 irq 6 drq 2 on isa0
pcic0: <Intel i82365> at port 0x3e0-0x3e1 on isa0
pcic0: Polling mode
pccard0: <PC Card bus -- kludge version> on pcic0
pccard1: <PC Card bus -- kludge version> on pcic0
pcm0: <OPL3-SA3 (YMF715)> at port 0x530-0x537,0x370-0x371 irq 5 drq 1 flags 0xc110 on 
pmtimer0 on isa0
ppc0: <Parallel port> at port 0x378-0x37f irq 7 flags 0x1 on isa0
ppc0: Generic chipset (NIBBLE-only) in NIBBLE mode
plip0: <PLIP network interface> on ppbus0
sc0: <System console> on isa0
sc0: VGA <16 virtual consoles, flags=0x200>
sio0 at port 0x3f8-0x3ff irq 4 flags 0x10 on isa0
sio0: type 16550A
vga0: <Generic ISA VGA> at port 0x3c0-0x3df iomem 0xa0000-0xbffff on isa0
unknown: <PNP0303> can't assign resources
unknown: <TOS7400> can't assign resources
unknown: <PNP0700> can't assign resources
unknown: <PNP0600> can't assign resources
unknown: <PNP0600> can't assign resources
unknown: <PNP0501> can't assign resources
unknown: <PNP0401> can't assign resources
unknown: <PNP0e00> can't assign resources
unknown: <TOS7009> can't assign resources
unknown: <YMH0021> can't assign resources
lp0 XXX: driver didn't initialize queue mtx
lo0 XXX: driver didn't initialize queue mtx
ad0: 1376MB <TOSHIBA MK1403MAV> [2796/16/63] at ata0-master BIOSPIO
acd0: CDROM <TOSHIBA CD-ROM XM-1502BN> at ata1-master using BIOSPIO
Mounting root from ufs:/dev/ad0s1a
pccard: card inserted, slot 0
pccard: card inserted, slot 1
WARNING: / was not properly dismounted
ed0 at port 0x240-0x25f irq 3 slot 0 on pccard0
ed0: address 00:80:c8:88:86:b1, type NE2000 (16 bit) 
sio1 at port 0x2e8-0x2ef irq 10 slot 1 on pccard1
sio1: type 16550A


machine         i386
cpu             I586_CPU # Coz we don't need stuff for I386, I486 and I686
ident           GENERIC
maxusers        10

#options                KTRACE
options         FFS
#options                FFS_ROOT
options         NFS
options         MSDOSFS
options         INET                    #InterNETworking
options         PROCFS                  #Process filesystem
options         COMPAT_43               #Compatible with BSD 4.3 [KEEP THIS!]
options         USERCONFIG              #boot -c editor
options         VISUAL_USERCONFIG       #visual boot -c editor
options         NSWAPDEV=1
options         CLK_USE_I8254_CALIBRATION
options         USER_LDT
options         P1003_1B
options         _KPOSIX_VERSION=199309L

device          random

device          isa

#device         pcm

device          fdc

device          ata
device          atadisk
device          atapicd

device          atkbdc  1
device          atkbd
device          psm
#options                PSM_HOOKAPM

device          vga
device          sc      1
options         VESA
options         SC_PIXEL_MODE
#options                SC_NO_SYSMOUSE
options         SC_TWOBUTTON_MOUSE
options         SC_HISTORY_SIZE=1024

device          npx

device          sio

device          apm
device          pmtimer

device          card
device          pcic
device          ed
options         PCIC_RESUME_RESET
options         POWERFAIL_NMI

# Zip Stuff - comment out if not needed
#device         vpo0
#device         scbus0 at vpo0
#device          da0

device          ppc
device          ppbus
device          plip
options         PPC_PROBE_CHIPSET

# Various Pseudo-Devices
device          loop
device          ether
device          pty
device          splash
device          bpf

options         SYSVSHM
options         SYSVSEM
options         SYSVMSG
options         SHMSEG=100

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