[gentoo-user] gentoo-sources-2.6.35-r12 causes kernel panic

[Mick]

I haven't had much luck with the 2.6.35 version of kernels - they have
cause panics on two different x86 boxen.

Now that 2.6.35 has gone stable so I tried it again and I'm getting a
kernel panic complaining about VFS unable to mount root fs:
==================================
VFS:  Cannot open root device "sda3" or unknown-block(0,0)
Please append a correct "root=" boot option; here are the available partitions:
Kernel panic - not syncing: VFS: Unable to mount root fs on unknown-block(0,0)
Pid: 1, comm: swapper Not tainted 2.6.35-gentoo-r12 #2
Call Trace:
 [<c14b3530>] ? panic+0x5f/0xc6
 [<c1693c68>] ? mount_block_root+0x1c2/0x245
 [<c1002930>] ? do_signal+0x766/0x7f2
 [<c1693d31>] ? mount_root+0x46/0x5a
 [<c1693e8b>] ? prepare_namespace+0x146/0x182
 [<c1093203>] ? sys_access+0x1f/0x23
 [<c16933f1>] ? kernel_init+0x1a9/0x1b7
 [<c1693248>] ? kernel_init+0x0/0x1b7
 [<c10030b6>] ? kernel_thread_helper+0x6/0x10
panic occurred, switching back to text console
==================================

This is my chipset:
=======================
     *-pci
          description: Host bridge
          product: 82915G/P/GV/GL/PL/910GL Memory Controller Hub
          vendor: Intel Corporation
          physical id: 100
          bus info: pci@0000:00:00.0
          version: 04
          width: 32 bits
          clock: 33MHz
        *-pci:0
             description: PCI bridge
             product: 82915G/P/GV/GL/PL/910GL PCI Express Root Port
             vendor: Intel Corporation
             physical id: 1
             bus info: pci@0000:00:01.0
             version: 04
             width: 32 bits
             clock: 33MHz
             capabilities: pci pm msi pciexpress normal_decode
bus_master cap_list
             configuration: driver=pcieport
             resources: irq:40 ioport:b000(size=4096)
memory:cfe00000-cfefffff memory:d0000000-dfffffff
[snip ...]
        *-pci:1
             description: PCI bridge
             product: 82801FB/FBM/FR/FW/FRW (ICH6 Family) PCI Express Port 1
             vendor: Intel Corporation
             physical id: 1c
             bus info: pci@0000:00:1c.0
             version: 03
             width: 32 bits
             clock: 33MHz
             capabilities: pci pciexpress msi pm normal_decode
bus_master cap_list
             configuration: driver=pcieport
             resources: irq:41 ioport:c000(size=4096)
memory:c0000000-c01fffff ioport:c0200000(size=2097152)
[snip ...]
        *-ide:1
             description: IDE interface
             product: 82801FB/FW (ICH6/ICH6W) SATA Controller
             vendor: Intel Corporation
             physical id: 1f.2
             bus info: pci@0000:00:1f.2
             logical name: scsi2
             version: 03
             width: 32 bits
             clock: 66MHz
             capabilities: ide pm bus_master cap_list emulated
             configuration: driver=ata_piix latency=0
             resources: irq:19 ioport:9400(size=8) ioport:9000(size=4)
ioport:8800(size=8) ioport:8400(size=4) ioport:8000(size=16)
           *-disk
                description: ATA Disk
                product: WDC WD2500JD-22H
                vendor: Western Digital
                physical id: 0.0.0
                bus info: scsi@2:0.0.0
                logical name: /dev/sda
                version: 08.0
                serial: WD-WMAL71304147
                size: 232GiB (250GB)
                capabilities: partitioned partitioned:dos
                configuration: ansiversion=5 signature=08640863
=======================

and these are the kernel options (which work fine with 2.6.34-r12):
=======================
# Bus options (PCI etc.)
#
CONFIG_PCI=y
# CONFIG_PCI_GOBIOS is not set
# CONFIG_PCI_GOMMCONFIG is not set
# CONFIG_PCI_GODIRECT is not set
# CONFIG_PCI_GOOLPC is not set
CONFIG_PCI_GOANY=y
CONFIG_PCI_BIOS=y
CONFIG_PCI_DIRECT=y
CONFIG_PCI_MMCONFIG=y
CONFIG_PCI_DOMAINS=y
# CONFIG_PCI_CNB20LE_QUIRK is not set
CONFIG_PCIEPORTBUS=y
CONFIG_PCIEAER=y
# CONFIG_PCIE_ECRC is not set
# CONFIG_PCIEAER_INJECT is not set
# CONFIG_PCIEASPM is not set
CONFIG_PCIE_PME=y
CONFIG_ARCH_SUPPORTS_MSI=y
# CONFIG_PCI_MSI is not set
# CONFIG_PCI_STUB is not set
CONFIG_HT_IRQ=y
# CONFIG_PCI_IOV is not set
CONFIG_PCI_IOAPIC=y
CONFIG_ISA_DMA_API=y
CONFIG_ISA=y
# CONFIG_EISA is not set
# CONFIG_MCA is not set
# CONFIG_SCx200 is not set
# CONFIG_OLPC is not set
CONFIG_K8_NB=y
# CONFIG_PCCARD is not set
# CONFIG_HOTPLUG_PCI is not set
[snip ...]

# Protocols
#
# CONFIG_ISAPNP is not set
# CONFIG_PNPBIOS is not set
CONFIG_PNPACPI=y
CONFIG_BLK_DEV=y
# CONFIG_BLK_DEV_FD is not set
# CONFIG_BLK_DEV_XD is not set
# CONFIG_PARIDE is not set
# CONFIG_BLK_CPQ_DA is not set
# CONFIG_BLK_CPQ_CISS_DA is not set
# CONFIG_BLK_DEV_DAC960 is not set
# CONFIG_BLK_DEV_UMEM is not set
# CONFIG_BLK_DEV_COW_COMMON is not set
CONFIG_BLK_DEV_LOOP=y
# CONFIG_BLK_DEV_CRYPTOLOOP is not set
# CONFIG_BLK_DEV_DRBD is not set
# CONFIG_BLK_DEV_NBD is not set
# CONFIG_BLK_DEV_SX8 is not set
# CONFIG_BLK_DEV_UB is not set
CONFIG_BLK_DEV_RAM=y
CONFIG_BLK_DEV_RAM_COUNT=16
CONFIG_BLK_DEV_RAM_SIZE=4096
# CONFIG_BLK_DEV_XIP is not set
CONFIG_CDROM_PKTCDVD=y
CONFIG_CDROM_PKTCDVD_BUFFERS=8
# CONFIG_CDROM_PKTCDVD_WCACHE is not set
# CONFIG_ATA_OVER_ETH is not set
# CONFIG_BLK_DEV_HD is not set
# CONFIG_MISC_DEVICES is not set
CONFIG_HAVE_IDE=y
# CONFIG_IDE is not set

#
# SCSI device support
#
CONFIG_SCSI_MOD=y
# CONFIG_RAID_ATTRS is not set
CONFIG_SCSI=y
CONFIG_SCSI_DMA=y
# CONFIG_SCSI_TGT is not set
# CONFIG_SCSI_NETLINK is not set
CONFIG_SCSI_PROC_FS=y

#
# SCSI support type (disk, tape, CD-ROM)
#
CONFIG_BLK_DEV_SD=y
# CONFIG_CHR_DEV_ST is not set
# CONFIG_CHR_DEV_OSST is not set
CONFIG_BLK_DEV_SR=y
# CONFIG_BLK_DEV_SR_VENDOR is not set
CONFIG_CHR_DEV_SG=y
# CONFIG_CHR_DEV_SCH is not set
CONFIG_SCSI_MULTI_LUN=y
# CONFIG_SCSI_CONSTANTS is not set
# CONFIG_SCSI_LOGGING is not set
# CONFIG_SCSI_SCAN_ASYNC is not set
CONFIG_SCSI_WAIT_SCAN=m

# SCSI Transports
#
# CONFIG_SCSI_SPI_ATTRS is not set
# CONFIG_SCSI_FC_ATTRS is not set
# CONFIG_SCSI_ISCSI_ATTRS is not set
# CONFIG_SCSI_SAS_ATTRS is not set
# CONFIG_SCSI_SAS_LIBSAS is not set
# CONFIG_SCSI_SRP_ATTRS is not set
# CONFIG_SCSI_LOWLEVEL is not set
CONFIG_SCSI_DH=y
# CONFIG_SCSI_DH_RDAC is not set
# CONFIG_SCSI_DH_HP_SW is not set
# CONFIG_SCSI_DH_EMC is not set
# CONFIG_SCSI_DH_ALUA is not set
# CONFIG_SCSI_OSD_INITIATOR is not set
CONFIG_ATA=y
# CONFIG_ATA_NONSTANDARD is not set
# CONFIG_ATA_VERBOSE_ERROR is not set
CONFIG_ATA_ACPI=y
# CONFIG_SATA_PMP is not set

#
# Controllers with non-SFF native interface
#
# CONFIG_SATA_AHCI is not set
# CONFIG_SATA_AHCI_PLATFORM is not set
# CONFIG_SATA_INIC162X is not set
# CONFIG_SATA_SIL24 is not set
# CONFIG_ATA_SFF is not set
# CONFIG_MD is not set
# CONFIG_FUSION is not set
=======================

Am I missing something obvious to make the 2.6.35 series work with my boxen?

Please ask if you need more info.
-- 
Regards,
Mick