Description of problem:

When boot an RHEL 5.7, I met this kernel panic.

RAMDISK: Compressed image found at block 0 
invalid compressed format (err=2) 
EXT2-fs: unable to read superblock 
isofs_fill_super: bread failed, dev=md1, iso_blknum=16, block=32 
No filesystem could mount root, tried:  ext2 iso9660 
Kernel panic - not syncing: VFS: Unable to mount root fs on unknown-block(9,1) 


Version-Release number of selected component (if applicable):
Linux version 2.6.18-262.el5
gcc version 4.1.2 20080704 (Red Hat 4.1.2-50)

How reproducible:
once

Steps to Reproduce:
1.
2.
3.
  
Actual results:


Expected results:


Additional info:
http://beaker-archive.app.eng.bos.redhat.com/beaker-logs/2011/05/881/88132/180889/console.log

 Linux version 2.6.18-262.el5 (mockbuild.bos.redhat.com) (gcc version 4.1.2 20080704 (Red Hat 4.1.2-50)) #1 SMP Mon May 16 17:46:41 EDT 2011 
BIOS-provided physical RAM map: 
 BIOS-e820: 0000000000010000 - 0000000000097000 (usable) 
 BIOS-e820: 0000000000097000 - 00000000000a0000 (reserved) 
 BIOS-e820: 00000000000e8000 - 0000000000100000 (reserved) 
 BIOS-e820: 0000000000100000 - 000000007ffc2e40 (usable) 
 BIOS-e820: 000000007ffc2e40 - 0000000080000000 (reserved) 
 BIOS-e820: 00000000e0000000 - 00000000f0000000 (reserved) 
 BIOS-e820: 00000000fec00000 - 0000000100000000 (reserved) 
1151MB HIGHMEM available. 
896MB LOWMEM available. 
found SMP MP-table at 000fffc0 
Memory for crash kernel (0x0 to 0x0) notwithin permissible range 
disabling kdump 
Using x86 segment limits to approximate NX protection 
DMI 2.5 present. 
Using APIC driver default 
ACPI: PM-Timer IO Port: 0xf808 
ACPI: LAPIC (acpi_id[0x01] lapic_id[0x00] enabled) 
Processor #0 6:15 APIC version 20 
ACPI: LAPIC (acpi_id[0x02] lapic_id[0x04] enabled) 
Processor #4 6:15 APIC version 20 
ACPI: LAPIC (acpi_id[0x03] lapic_id[0x02] enabled) 
Processor #2 6:15 APIC version 20 
ACPI: LAPIC (acpi_id[0x04] lapic_id[0x06] enabled) 
Processor #6 6:15 APIC version 20 
ACPI: LAPIC (acpi_id[0x05] lapic_id[0x01] enabled) 
Processor #1 6:15 APIC version 20 
ACPI: LAPIC (acpi_id[0x06] lapic_id[0x05] enabled) 
Processor #5 6:15 APIC version 20 
ACPI: LAPIC (acpi_id[0x07] lapic_id[0x03] enabled) 
Processor #3 6:15 APIC version 20 
ACPI: LAPIC (acpi_id[0x08] lapic_id[0x07] enabled) 
Processor #7 6:15 APIC version 20 
ACPI: LAPIC_NMI (acpi_id[0x01] high edge lint[0x1]) 
ACPI: LAPIC_NMI (acpi_id[0x02] high edge lint[0x1]) 
ACPI: LAPIC_NMI (acpi_id[0x03] high edge lint[0x1]) 
ACPI: LAPIC_NMI (acpi_id[0x04] high edge lint[0x1]) 
ACPI: LAPIC_NMI (acpi_id[0x05] high edge lint[0x1]) 
ACPI: LAPIC_NMI (acpi_id[0x06] high edge lint[0x1]) 
ACPI: LAPIC_NMI (acpi_id[0x07] high edge lint[0x1]) 
ACPI: LAPIC_NMI (acpi_id[0x08] high edge lint[0x1]) 
ACPI: IOAPIC (id[0x01] address[0xfec00000] gsi_base[0]) 
IOAPIC[0]: apic_id 1, version 32, address 0xfec00000, GSI 0-23 
ACPI: INT_SRC_OVR (bus 0 bus_irq 0 global_irq 2 dfl dfl) 
ACPI: INT_SRC_OVR (bus 0 bus_irq 9 global_irq 9 high level) 
Enabling APIC mode:  Flat.  Using 1 I/O APICs 
ACPI: HPET id: 0x8086a201 base: 0xfed00000 
Using ACPI (MADT) for SMP configuration information 
Allocating PCI resources starting at 88000000 (gap: 80000000:60000000) 
Detected 1595.982 MHz processor. 
Built 1 zonelists.  Total pages: 524226 
Kernel command line: initrd=/images/RHEL5.7-Server-20110518.0_nfs-i386/initrd.img ksdevice=00:1A:4B:C5:59:35 kssendmac console=ttyS0,115200n81 ks=http://10.16.64.21/cblr/svc/op/ks/system/hp-xw6400-02.lab.bos.redhat.com BOOT_IMAGE=/images/RHEL5.7-Server-20110518.0_nfs-i386/vmlinuz BOOTIF=01-00-1a-4b-c5-59-35  
Enabling fast FPU save and restore... done. 
Enabling unmasked SIMD FPU exception support... done. 
Initializing CPU#0 
CPU 0 irqstacks, hard=c076f000 soft=c074f000 
PID hash table entries: 4096 (order: 12, 16384 bytes) 
Console: colour VGA+ 80x25 
Dentry cache hash table entries: 131072 (order: 7, 524288 bytes) 
Inode-cache hash table entries: 65536 (order: 6, 262144 bytes) 
Memory: 2063728k/2096904k available (2194k kernel code, 31952k reserved, 915k data, 232k init, 1179400k highmem) 
Checking if this processor honours the WP bit even in supervisor mode... Ok. 
hpet0: at MMIO 0xfed00000 (virtual 0xf8800000), IRQs 2, 8, 0 
hpet0: 3 64-bit timers, 14318180 Hz 
Using HPET for base-timer 
Calibrating delay loop (skipped), value calculated using timer frequency.. 3191.96 BogoMIPS (lpj=1595982) 
Security Framework v1.0.0 initialized 
SELinux:  Initializing. 
selinux_register_security:  Registering secondary module capability 
Capability LSM initialized as secondary 
Mount-cache hash table entries: 512 
monitor/mwait feature present. 
using mwait in idle threads. 
CPU: L1 I cache: 32K, L1 D cache: 32K 
CPU: L2 cache: 4096K 
CPU: Physical Processor ID: 0 
CPU: Processor Core ID: 0 
Intel machine check architecture supported. 
Intel machine check reporting enabled on CPU#0. 
Checking 'hlt' instruction... OK. 
SMP alternatives: switching to UP code 
ACPI: Core revision 20060707 
CPU0: Intel(R) Xeon(R) CPU           E5310  @ 1.60GHz stepping 07 
SMP alternatives: switching to SMP code 
Booting processor 1/1 eip 11000 
CPU 1 irqstacks, hard=c0770000 soft=c0750000 
Initializing CPU#1 
Calibrating delay using timer specific routine.. 3191.87 BogoMIPS (lpj=1595935) 
monitor/mwait feature present. 
CPU: L1 I cache: 32K, L1 D cache: 32K 
CPU: L2 cache: 4096K 
CPU: Physical Processor ID: 0 
CPU: Processor Core ID: 1 
Intel machine check architecture supported. 
Intel machine check reporting enabled on CPU#1. 
CPU1: Intel(R) Xeon(R) CPU           E5310  @ 1.60GHz stepping 07 
SMP alternatives: switching to SMP code 
Booting processor 2/2 eip 11000 
CPU 2 irqstacks, hard=c0771000 soft=c0751000 
Initializing CPU#2 
Calibrating delay using timer specific routine.. 3191.87 BogoMIPS (lpj=1595939) 
monitor/mwait feature present. 
CPU: L1 I cache: 32K, L1 D cache: 32K 
CPU: L2 cache: 4096K 
CPU: Physical Processor ID: 0 
CPU: Processor Core ID: 2 
Intel machine check architecture supported. 
Intel machine check reporting enabled on CPU#2. 
CPU2: Intel(R) Xeon(R) CPU           E5310  @ 1.60GHz stepping 07 
SMP alternatives: switching to SMP code 
Booting processor 3/3 eip 11000 
CPU 3 irqstacks, hard=c0772000 soft=c0752000 
Initializing CPU#3 
Calibrating delay using timer specific routine.. 3191.88 BogoMIPS (lpj=1595942) 
monitor/mwait feature present. 
CPU: L1 I cache: 32K, L1 D cache: 32K 
CPU: L2 cache: 4096K 
CPU: Physical Processor ID: 0 
CPU: Processor Core ID: 3 
Intel machine check architecture supported. 
Intel machine check reporting enabled on CPU#3. 
CPU3: Intel(R) Xeon(R) CPU           E5310  @ 1.60GHz stepping 07 
SMP alternatives: switching to SMP code 
Booting processor 4/4 eip 11000 
CPU 4 irqstacks, hard=c0773000 soft=c0753000 
Initializing CPU#4 
Calibrating delay using timer specific routine.. 3191.90 BogoMIPS (lpj=1595951) 
monitor/mwait feature present. 
CPU: L1 I cache: 32K, L1 D cache: 32K 
CPU: L2 cache: 4096K 
CPU: Physical Processor ID: 1 
CPU: Processor Core ID: 0 
Intel machine check architecture supported. 
Intel machine check reporting enabled on CPU#4. 
CPU4: Intel(R) Xeon(R) CPU           E5310  @ 1.60GHz stepping 07 
SMP alternatives: switching to SMP code 
Booting processor 5/5 eip 11000 
CPU 5 irqstacks, hard=c0774000 soft=c0754000 
Initializing CPU#5 
Calibrating delay using timer specific routine.. 3191.89 BogoMIPS (lpj=1595948) 
monitor/mwait feature present. 
CPU: L1 I cache: 32K, L1 D cache: 32K 
CPU: L2 cache: 4096K 
CPU: Physical Processor ID: 1 
CPU: Processor Core ID: 1 
Intel machine check architecture supported. 
Intel machine check reporting enabled on CPU#5. 
CPU5: Intel(R) Xeon(R) CPU           E5310  @ 1.60GHz stepping 07 
SMP alternatives: switching to SMP code 
Booting processor 6/6 eip 11000 
CPU 6 irqstacks, hard=c0775000 soft=c0755000 
Initializing CPU#6 
Calibrating delay using timer specific routine.. 3191.90 BogoMIPS (lpj=1595953) 
monitor/mwait feature present. 
CPU: L1 I cache: 32K, L1 D cache: 32K 
CPU: L2 cache: 4096K 
CPU: Physical Processor ID: 1 
CPU: Processor Core ID: 2 
Intel machine check architecture supported. 
Intel machine check reporting enabled on CPU#6. 
CPU6: Intel(R) Xeon(R) CPU           E5310  @ 1.60GHz stepping 07 
SMP alternatives: switching to SMP code 
Booting processor 7/7 eip 11000 
CPU 7 irqstacks, hard=c0776000 soft=c0756000 
Initializing CPU#7 
Calibrating delay using timer specific routine.. 3191.89 BogoMIPS (lpj=1595947) 
monitor/mwait feature present. 
CPU: L1 I cache: 32K, L1 D cache: 32K 
CPU: L2 cache: 4096K 
CPU: Physical Processor ID: 1 
CPU: Processor Core ID: 3 
Intel machine check architecture supported. 
Intel machine check reporting enabled on CPU#7. 
CPU7: Intel(R) Xeon(R) CPU           E5310  @ 1.60GHz stepping 07 
Total of 8 processors activated (25535.19 BogoMIPS). 
ENABLING IO-APIC IRQs 
..TIMER: vector=0x31 apic1=0 pin1=2 apic2=-1 pin2=-1 
Using local APIC timer interrupts. 
checking TSC synchronization across 8 CPUs: passed. 
Brought up 8 CPUs 
migration_cost=29,3277 
checking if image is initramfs...it isn't (invalid compressed format (err=2)); looks like an initrd 
Freeing initrd memory: 9931k freed 
NET: Registered protocol family 16 
ACPI: bus type pci registered 
PCI: Using MMCONFIG 
Setting up standard PCI resources 
HP xw System ... overriding gpe0_blk to 32-bit value  
ACPI: Interpreter enabled 
ACPI: Using IOAPIC for interrupt routing 
ACPI: No dock devices found. 
ACPI: PCI Root Bridge [PCI0] (0000:00) 
PCI: Ignoring BAR0-3 of IDE controller 0000:00:1f.1 
PCI: Transparent bridge - 0000:00:1e.0 
ACPI: PCI Interrupt Link [LNKA] (IRQs *3 4 5 6 7 10 11 14 15) 
ACPI: PCI Interrupt Link [LNKB] (IRQs 3 4 *5 6 7 10 11 14 15) 
ACPI: PCI Interrupt Link [LNKC] (IRQs 3 4 5 6 7 *10 11 14 15) 
ACPI: PCI Interrupt Link [LNKD] (IRQs 3 4 *5 6 7 10 11 14 15) 
ACPI: PCI Interrupt Link [LNKE] (IRQs 3 4 5 6 7 10 11 14 15) *0, disabled. 
ACPI: PCI Interrupt Link [LNKF] (IRQs *3 4 5 6 7 10 11 14 15) 
ACPI: PCI Interrupt Link [LNKG] (IRQs 3 4 5 6 7 10 11 14 15) *0, disabled. 
ACPI: PCI Interrupt Link [LNKH] (IRQs 3 4 5 6 7 10 *11 14 15) 
Linux Plug and Play Support v0.97 (c) Adam Belay 
pnp: PnP ACPI init 
pnp: PnP ACPI: found 17 devices 
usbcore: registered new driver usbfs 
usbcore: registered new driver hub 
PCI: Using ACPI for IRQ routing 
PCI: If a device doesn't work, try "pci=routeirq".  If it helps, post a report 
NetLabel: Initializing 
NetLabel:  domain hash size = 128 
NetLabel:  protocols = UNLABELED CIPSOv4 
NetLabel:  unlabeled traffic allowed by default 
pnp: 00:0c: ioport range 0x4d0-0x4d1 has been reserved 
pnp: 00:0d: ioport range 0x400-0x41f has been reserved 
pnp: 00:0d: ioport range 0x420-0x43f has been reserved 
pnp: 00:0d: ioport range 0x440-0x45f has been reserved 
pnp: 00:0d: ioport range 0x460-0x47f could not be reserved 
pnp: 00:0d: ioport range 0x480-0x48f has been reserved 
pnp: 00:0d: ioport range 0x490-0x49f has been reserved 
pnp: 00:0d: ioport range 0xf800-0xf81f could not be reserved 
pnp: 00:0d: ioport range 0xf820-0xf83f could not be reserved 
pnp: 00:0e: iomem range 0xfed1c000-0xfed1ffff could not be reserved 
pnp: 00:0e: iomem range 0xffe00000-0xffffffff could not be reserved 
pnp: 00:0e: iomem range 0xfee00000-0xfeefffff could not be reserved 
pnp: 00:0e: iomem range 0xfe700000-0xfe7003ff has been reserved 
pnp: 00:0f: iomem range 0x0-0x9ffff could not be reserved 
pnp: 00:0f: iomem range 0xc0000-0xe7fff could not be reserved 
pnp: 00:0f: iomem range 0xe8000-0xeffff has been reserved 
pnp: 00:0f: iomem range 0xf0000-0xfffff could not be reserved 
pnp: 00:10: iomem range 0xe0000000-0xefffffff could not be reserved 
PCI: Bridge: 0000:1e:00.0 
  IO window: 2000-0000 
  MEM window: f2900000-00000000 
  PREFETCH window 0x0000000088800000-0x00000000889fffff 
PCI: Bridge: 0000:1e:01.0 
  IO window: disabled. 
  MEM window: f2a00000-00000000 
  PREFETCH window: disabled. 
PCI: Bridge: 0000:10:00.0 
  IO window: 2000-0000 
  MEM window: f2900000-00000000 
  PREFETCH window 0x0000000088800000-0x00000000889fffff 
PCI: Bridge: 0000:10:00.3 
  IO window: disabled. 
  MEM window: disabled. 
  PREFETCH window: disabled. 
PCI: Bridge: 0000:00:02.0 
  IO window: 2000-0000 
  MEM window: f2900000-00000000 
  PREFETCH window 0x0000000088800000-0x00000000889fffff 
PCI: Bridge: 0000:00:03.0 
  IO window: disabled. 
  MEM window: disabled. 
  PREFETCH window: disabled. 
PCI: mem resource #6:20000@e0000000 for 0000:40:00.0 was not allocated. 
PCI: Bridge: 0000:00:04.0 
  IO window: disabled. 
  MEM window: f0000000-00000000 
  PREFETCH window 0x00000000d0000000-0x00000000dfffffff 
PCI: Bridge: 0000:00:05.0 
  IO window: disabled. 
  MEM window: disabled. 
  PREFETCH window: disabled. 
PCI: Bridge: 0000:00:06.0 
  IO window: disabled. 
  MEM window: disabled. 
  PREFETCH window: disabled. 
PCI: Bridge: 0000:00:07.0 
  IO window: disabled. 
  MEM window: disabled. 
  PREFETCH window: disabled. 
PCI: Bridge: 0000:00:1c.0 
  IO window: 1000-0000 
  MEM window: f2000000-00000000 
  PREFETCH window 0x0000000088000000-0x00000000887fffff 
PCI: Bridge: 0000:00:1e.0 
  IO window: disabled. 
  MEM window: disabled. 
  PREFETCH window: disabled. 
ACPI: PCI Interrupt 0000:1e:00.0[A] -> GSI 16 (level, low) -> IRQ 169 
ACPI: PCI Interrupt 0000:1e:01.0[A] -> GSI 17 (level, low) -> IRQ 177 
ACPI: PCI Interrupt 0000:10:00.3[A] -> GSI 16 (level, low) -> IRQ 169 
ACPI: PCI Interrupt 0000:00:1c.0[A] -> GSI 16 (level, low) -> IRQ 169 
NET: Registered protocol family 2 
IP route cache hash table entries: 32768 (order: 5, 131072 bytes) 
TCP established hash table entries: 131072 (order: 8, 1048576 bytes) 
TCP bind hash table entries: 65536 (order: 7, 524288 bytes) 
TCP: Hash tables configured (established 131072 bind 65536) 
TCP reno registered 
apm: BIOS not found. 
audit: initializing netlink socket (disabled) 
type=2000 audit(1306145622.242:1): initialized 
highmem bounce pool size: 64 pages 
Total HugeTLB memory allocated, 0 
VFS: Disk quotas dquot_6.5.1 
Dquot-cache hash table entries: 1024 (order 0, 4096 bytes) 
Initializing Cryptographic API 
alg: No test for crc32c (crc32c-generic) 
ksign: Installing public key data 
Loading keyring 
- Added public key 45BD9A4D6D871F29 
- User ID: Red Hat, Inc. (Kernel Module GPG key) 
io scheduler noop registered 
io scheduler anticipatory registered 
io scheduler deadline registered 
io scheduler cfq registered (default) 
pci_hotplug: PCI Hot Plug PCI Core version: 0.5 
ACPI: Processor [CPU0] (supports 8 throttling states) 
ACPI: Processor [CPU4] (supports 8 throttling states) 
ACPI: Processor [CPU2] (supports 8 throttling states) 
ACPI: Processor [CPU6] (supports 8 throttling states) 
ACPI: Processor [CPU1] (supports 8 throttling states) 
ACPI: Processor [CPU5] (supports 8 throttling states) 
ACPI: Processor [CPU3] (supports 8 throttling states) 
ACPI: Processor [CPU7] (supports 8 throttling states) 
Real Time Clock Driver v1.12ac 
Non-volatile memory driver v1.2 
Linux agpgart interface v0.101 (c) Dave Jones 
Serial: 8250/16550 driver $Revision: 1.90 $ 4 ports, IRQ sharing enabled 
erial8250: ttyS0 at I/O 0x3f8 (irq = 4) is a 16550A 
00:08: ttyS0 at I/O 0x3f8 (irq = 4) is a 16550A 
brd: module loaded 
Uniform Multi-Platform E-IDE driver Revision: 7.00alpha2 
ide: Assuming 33MHz system bus speed for PIO modes; override with idebus=xx 
ESB2: IDE controller at PCI slot 0000:00:1f.1 
ACPI: PCI Interrupt 0000:00:1f.1[A] -> GSI 17 (level, low) -> IRQ 177 
ESB2: chipset revision 9 
ESB2: not 100% native mode: will probe irqs later 
    ide0: BM-DMA at 0x30c0-0x30c7, BIOS settings: hda:DMA, hdb:pio 
hda: LITE-ON DVD SOHD-16P9S, ATAPI CD/DVD-ROM drive 
ide0 at 0x1f0-0x1f7,0x3f6 on irq 14 
ide-floppy driver 0.99.newide 
usbcore: registered new driver hiddev 
usbcore: registered new driver usbhid 
drivers/usb/input/hid-core.c: v2.6:USB HID core driver 
PNP: PS/2 Controller [PNP0303:KBD,PNP0f0e:PS2M] at 0x60,0x64 irq 1,12 
serio: i8042 KBD port at 0x60,0x64 irq 1 
serio: i8042 AUX port at 0x60,0x64 irq 12 
mice: PS/2 mouse device common for all mice 
md: md driver 0.90.3 MAX_MD_DEVS=256, MD_SB_DISKS=27 
md: bitmap version 4.39 
TCP bic registered 
Initializing IPsec netlink socket 
NET: Registered protocol family 1 
NET: Registered protocol family 17 
Using IPI No-Shortcut mode 
ACPI: (supports<6>Time: tsc clocksource has been installed. 
 S0 S1 S3 S4 S5) 
Initalizing network drop monitor service 
md: Autodetecting RAID arrays. 
md: autorun ... 
md: ... autorun DONE. 
RAMDISK: Compressed image found at block 0 
invalid compressed format (err=2) 
EXT2-fs: unable to read superblock 
isofs_fill_super: bread failed, dev=md1, iso_blknum=16, block=32 
No filesystem could mount root, tried:  ext2 iso9660 
Kernel panic - not syncing: VFS: Unable to mount root fs on unknown-block(9,1) 
 [-- MARK -- Mon May 23 10:15:00 2011] 
[-- MARK -- Mon May 23 10:20:00 2011] 
[-- MARK -- Mon May 23 10:25:00 2011]