They happen both with IDE and SCSI/libata...
IDE:
Linux version 2.6.25-06476-gc9a3f6d-dirty (bzolnier@localhost.localdomain) (gcc version 4.1.2 20070925 (Red Hat 4.1.2-27)) #225 PREEMPT Tue Apr 29 20:53:53 CEST 2008
BIOS-provided physical RAM map:
BIOS-e820: 0000000000000000 - 000000000009fc00 (usable)
BIOS-e820: 000000000009fc00 - 00000000000a0000 (reserved)
BIOS-e820: 00000000000e8000 - 0000000000100000 (reserved)
BIOS-e820: 0000000000100000 - 0000000007ff0000 (usable)
BIOS-e820: 0000000007ff0000 - 0000000008000000 (ACPI data)
BIOS-e820: 00000000fffc0000 - 0000000100000000 (reserved)
127MB LOWMEM available.
Zone PFN ranges:
DMA 0 -> 4096
Normal 4096 -> 32752
Movable zone start PFN for each node
early_node_map[1] active PFN ranges
0: 0 -> 32752
DMI not present or invalid.
ACPI: RSDP 000FA5D0, 0014 (r0 QEMU )
ACPI: RSDT 07FF0000, 002C (r0 QEMU QEMURSDT 1 QEMU 1)
ACPI: FACP 07FF002C, 0074 (r0 QEMU QEMUFACP 1 QEMU 1)
ACPI: DSDT 07FF0100, 0832 (r1 BXPC BXDSDT 1 INTL 20060912)
ACPI: FACS 07FF00C0, 0040
ACPI: APIC 07FF0938, 0040 (r0 QEMU QEMUAPIC 1 QEMU 1)
ACPI: PM-Timer IO Port: 0xb008
ACPI: LAPIC (acpi_id[0x00] lapic_id[0x00] enabled)
BIOS bug, APIC version is 0 for CPU#0! fixing up to 0x10. (tell your hw vendor)
ACPI: IOAPIC (id[0x01] address[0xfec00000] gsi_base[0])
IOAPIC[0]: apic_id 1, version 17, address 0xfec00000, GSI 0-23
Enabling APIC mode: Flat. Using 1 I/O APICs
Using ACPI (MADT) for SMP configuration information
Allocating PCI resources starting at 10000000 (gap: 08000000:f7fc0000)
Built 1 zonelists in Zone order, mobility grouping on. Total pages: 32497
Kernel command line: root=/dev/hda init=/bin/sh console=ttyS0,115200
Enabling fast FPU save and restore... done.
Enabling unmasked SIMD FPU exception support... done.
Initializing CPU#0
CPU 0 irqstacks, hard=c03e1000 soft=c03e0000
PID hash table entries: 512 (order: 9, 2048 bytes)
Detected 1495.172 MHz processor.
Console: colour VGA+ 80x25
console [ttyS0] enabled
Dentry cache hash table entries: 16384 (order: 4, 65536 bytes)
Inode-cache hash table entries: 8192 (order: 3, 32768 bytes)
Memory: 126096k/131008k available (1912k kernel code, 4432k reserved, 832k data, 180k init, 0k highmem)
virtual kernel memory layout:
fixmap : 0xfffb5000 - 0xfffff000 ( 296 kB)
vmalloc : 0xc8800000 - 0xfffb3000 ( 887 MB)
lowmem : 0xc0000000 - 0xc7ff0000 ( 127 MB)
.init : 0xc03b0000 - 0xc03dd000 ( 180 kB)
.data : 0xc02de117 - 0xc03ae1e0 ( 832 kB)
.text : 0xc0100000 - 0xc02de117 (1912 kB)
Checking if this processor honours the WP bit even in supervisor mode...Ok.
Calibrating delay using timer specific routine.. 3012.98 BogoMIPS (lpj=6025962)
Mount-cache hash table entries: 512
CPU: L1 I cache: 8K
CPU: L2 cache: 128K
Compat vDSO mapped to ffffe000.
CPU: Intel Pentium II (Klamath) stepping 03
Checking 'hlt' instruction... OK.
Freeing SMP alternatives: 0k freed
ACPI: Core revision 20070126
ENABLING IO-APIC IRQs
..TIMER: vector=0x31 apic1=0 pin1=0 apic2=-1 pin2=-1
APIC calibration not consistent with PM Timer: 52ms instead of 100ms
APIC delta adjusted to PM-Timer: 6250026 (3292476)
net_namespace: 480 bytes
NET: Registered protocol family 16
No dock devices found.
ACPI: bus type pci registered
PCI: PCI BIOS revision 2.10 entry at 0xfa110, last bus=0
PCI: Using configuration type 1 for base access
Setting up standard PCI resources
ACPI: Interpreter enabled
ACPI: (supports S0 S5)
ACPI: Using IOAPIC for interrupt routing
ACPI: PCI Root Bridge [PCI0] (0000:00)
* Found PM-Timer Bug on the chipset. Due to workarounds for a bug,
* this clock source is slow. Consider trying other clock sources
pci 0000:00:01.3: quirk: region b000-b03f claimed by PIIX4 ACPI
pci 0000:00:01.3: quirk: region b100-b10f claimed by PIIX4 SMB
ACPI: PCI Interrupt Link [LNKA] (IRQs 3 4 5 6 7 9 10 *11 12)
ACPI: PCI Interrupt Link [LNKB] (IRQs 3 4 5 6 7 *9 10 11 12)
ACPI: PCI Interrupt Link [LNKC] (IRQs 3 4 5 6 7 9 10 *11 12)
ACPI: PCI Interrupt Link [LNKD] (IRQs 3 4 5 6 7 *9 10 11 12)
Linux Plug and Play Support v0.97 (c) Adam Belay
pnp: PnP ACPI init
ACPI: bus type pnp registered
pnp: PnP ACPI: found 6 devices
ACPI: ACPI bus type pnp unregistered
SCSI subsystem initialized
usbcore: registered new interface driver usbfs
usbcore: registered new interface driver hub
usbcore: registered new device driver usb
PCI: Using ACPI for IRQ routing
NET: Registered protocol family 2
IP route cache hash table entries: 1024 (order: 0, 4096 bytes)
TCP established hash table entries: 4096 (order: 3, 32768 bytes)
TCP bind hash table entries: 4096 (order: 2, 16384 bytes)
TCP: Hash tables configured (established 4096 bind 4096)
TCP reno registered
NET: Registered protocol family 1
audit: initializing netlink socket (disabled)
type=2000 audit(1209495511.389:1): initialized
Total HugeTLB memory allocated, 0
fuse init (API version 7.9)
msgmni has been set to 246 for ipc namespace c0394260
io scheduler noop registered
io scheduler anticipatory registered (default)
io scheduler deadline registered
io scheduler cfq registered
pci 0000:00:00.0: Limiting direct PCI/PCI transfers
pci 0000:00:01.0: PIIX3: Enabling Passive Release
pci 0000:00:01.0: Activating ISA DMA hang workarounds
isapnp: Scanning for PnP cards...
isapnp: No Plug & Play device found
Real Time Clock Driver v1.12ac
Linux agpgart interface v0.103
Serial: 8250/16550 driver $Revision: 1.90 $ 4 ports, IRQ sharing enabled
Switched to NOHz mode on CPU #0
