2.5.46 / Asus A7M266 - spontaneous reboots - CAUSE FOUND

I've just started testing 2.5.46 and am not getting very far. After about five minutes of use the system spontaneously reboots.

Asus A7M266, Athlon XP2000, 512MB RAM, all partitions mounted as EXT2.

Kernel config follows (ACPI is included but disabled from the kernel command line). The only modules loaded are the sound and network modules.

2.4.19 works fine on this box.

P.

--x--x--x--x--x--x--

CONFIG_X86=y
CONFIG_MMU=y
CONFIG_SWAP=y
CONFIG_UID16=y
CONFIG_GENERIC_ISA_DMA=y

CONFIG_EXPERIMENTAL=y

CONFIG_NET=y
CONFIG_SYSVIPC=y
CONFIG_SYSCTL=y

CONFIG_MODULES=y
CONFIG_KMOD=y

CONFIG_MK7=y
CONFIG_X86_CMPXCHG=y
CONFIG_X86_XADD=y
CONFIG_X86_L1_CACHE_SHIFT=6
CONFIG_RWSEM_XCHGADD_ALGORITHM=y
CONFIG_X86_WP_WORKS_OK=y
CONFIG_X86_INVLPG=y
CONFIG_X86_BSWAP=y
CONFIG_X86_POPAD_OK=y
CONFIG_X86_TSC=y
CONFIG_X86_GOOD_APIC=y
CONFIG_X86_USE_PPRO_CHECKSUM=y
CONFIG_X86_USE_3DNOW=y
CONFIG_X86_MCE=y
CONFIG_NOHIGHMEM=y
CONFIG_MTRR=y

CONFIG_ACPI=y
CONFIG_ACPI_BOOT=y
CONFIG_ACPI_BUTTON=y
CONFIG_ACPI_BUS=y
CONFIG_ACPI_INTERPRETER=y
CONFIG_ACPI_EC=y
CONFIG_ACPI_POWER=y
CONFIG_ACPI_PCI=y
CONFIG_ACPI_SYSTEM=y

CONFIG_PCI=y
CONFIG_PCI_GOANY=y
CONFIG_PCI_BIOS=y
CONFIG_PCI_DIRECT=y
CONFIG_PCI_NAMES=y

CONFIG_KCORE_ELF=y
CONFIG_BINFMT_ELF=y

CONFIG_PARPORT=m
CONFIG_PARPORT_PC=m
CONFIG_PARPORT_PC_CML1=m
CONFIG_PARPORT_PC_FIFO=y
CONFIG_PARPORT_PC_SUPERIO=y
CONFIG_PARPORT_1284=y

CONFIG_BLK_DEV_FD=y
CONFIG_BLK_DEV_LOOP=m
CONFIG_BLK_DEV_RAM=m
CONFIG_BLK_DEV_RAM_SIZE=8192

CONFIG_IDE=y

CONFIG_BLK_DEV_IDE=y

CONFIG_BLK_DEV_IDEDISK=y
CONFIG_IDEDISK_MULTI_MODE=y
CONFIG_BLK_DEV_IDECD=m
CONFIG_BLK_DEV_IDESCSI=m

CONFIG_BLK_DEV_IDEPCI=y
CONFIG_IDEPCI_SHARE_IRQ=y
CONFIG_BLK_DEV_IDEDMA_PCI=y
CONFIG_IDEDMA_PCI_AUTO=y
CONFIG_BLK_DEV_IDEDMA=y
CONFIG_BLK_DEV_ADMA=y
CONFIG_BLK_DEV_VIA82CXXX=y
CONFIG_IDEDMA_AUTO=y
CONFIG_BLK_DEV_IDE_MODES=y

CONFIG_SCSI=m

CONFIG_BLK_DEV_SD=m
CONFIG_BLK_DEV_SR=m
CONFIG_SR_EXTRA_DEVS=2
CONFIG_CHR_DEV_SG=m

CONFIG_SCSI_MULTI_LUN=y
CONFIG_SCSI_CONSTANTS=y

CONFIG_PACKET=y
CONFIG_UNIX=y
CONFIG_INET=y
CONFIG_IP_MULTICAST=y

CONFIG_IPV6_SCTP__=y

CONFIG_NETDEVICES=y

CONFIG_NET_ETHERNET=y

CONFIG_NET_PCI=y
CONFIG_EEPRO100=m
CONFIG_NE2K_PCI=m
CONFIG_8139TOO=m
CONFIG_VIA_RHINE=m

CONFIG_INPUT=y

CONFIG_INPUT_MOUSEDEV=y
CONFIG_INPUT_MOUSEDEV_PSAUX=y
CONFIG_INPUT_MOUSEDEV_SCREEN_X=1024
CONFIG_INPUT_MOUSEDEV_SCREEN_Y=768

CONFIG_SOUND_GAMEPORT=y
CONFIG_SERIO=y
CONFIG_SERIO_I8042=y

CONFIG_INPUT_KEYBOARD=y
CONFIG_KEYBOARD_ATKBD=y
CONFIG_INPUT_MOUSE=y
CONFIG_MOUSE_PS2=y

CONFIG_VT=y
CONFIG_VT_CONSOLE=y
CONFIG_HW_CONSOLE=y

CONFIG_SERIAL_8250=y

CONFIG_SERIAL_CORE=y
CONFIG_UNIX98_PTYS=y
CONFIG_UNIX98_PTY_COUNT=256
CONFIG_PRINTER=m

CONFIG_I2C=m
CONFIG_I2C_ALGOBIT=m

CONFIG_AGP=m
CONFIG_AGP_AMD=y
CONFIG_DRM=y
CONFIG_DRM_RADEON=m

CONFIG_AUTOFS4_FS=m
CONFIG_FAT_FS=m
CONFIG_MSDOS_FS=m
CONFIG_VFAT_FS=m
CONFIG_TMPFS=y
CONFIG_RAMFS=y
CONFIG_ISO9660_FS=m
CONFIG_JOLIET=y
CONFIG_PROC_FS=y
CONFIG_DEVPTS_FS=y
CONFIG_EXT2_FS=y
CONFIG_UDF_FS=m
CONFIG_UDF_RW=y

CONFIG_NFS_FS=m
CONFIG_NFS_V3=y
CONFIG_NFSD=m
CONFIG_NFSD_V3=y
CONFIG_NFSD_TCP=y
CONFIG_SUNRPC=m
CONFIG_LOCKD=m
CONFIG_LOCKD_V4=y
CONFIG_EXPORTFS=m

CONFIG_MSDOS_PARTITION=y
CONFIG_NLS=y

CONFIG_NLS_DEFAULT="iso8859-1"

CONFIG_VGA_CONSOLE=y
CONFIG_VIDEO_SELECT=y

CONFIG_SOUND=m

CONFIG_SND=m
CONFIG_SND_OSSEMUL=y
CONFIG_SND_MIXER_OSS=m
CONFIG_SND_PCM_OSS=m

CONFIG_SND_ENS1371=m

CONFIG_USB=m

CONFIG_USB_STORAGE=m
CONFIG_USB_STORAGE_DATAFAB=y
CONFIG_USB_STORAGE_DPCM=y
CONFIG_USB_STORAGE_SDDR09=y
CONFIG_USB_STORAGE_JUMPSHOT=y

CONFIG_USB_SERIAL=m
CONFIG_USB_SERIAL_GENERIC=y
CONFIG_USB_SERIAL_FTDI_SIO=m

CONFIG_DEBUG_KERNEL=y
CONFIG_MAGIC_SYSRQ=y
CONFIG_KALLSYMS=y

CONFIG_SECURITY_CAPABILITIES=y

CONFIG_X86_BIOS_REBOOT=y