Since upgrading to 2.6.20, my Athlon 4 has been locking up on a very-roughly-daily basis, generally in periods of some load (I've never seen it lock up when idle, but have seen it lock up with a load average of 0.5). I'm fairly sure this didn't happen with 2.6.19 and am certain that it didn't with 2.6.18.
The lockups are almost total: network traffic ceases, the keyboard goes dead, nothing hits the disk. Once, however, it locked up while I was playing an ogg (emu10k1 / SB Live), and the sound did *not* die, but instead went into a ~1.5s-long tight loop. (Perhaps this was the card running on its own with no CPU assistance: I don't know enough about emu10k1 to know if that's plausible.) I turned off CONFIG_PREEMPT and went to CONFIG_PREEMPT_VOLUNTARY, and the lockups ceased. I can't tell if magic sysrq dies, because as far as I know there's no way to get magic sysrq to do much visible when you're in X, and I can't get anything to go over the network kernel syslog because the network is dead. I could begin a (really laborious, ~1 day per iteration) bisection to try to track this down, but before I start, has anyone seen this before? Is its cause known? Crashing .config follows (non-crashing one identical but for CONFIG_PREEMPT, as above): CONFIG_X86_32=y CONFIG_GENERIC_TIME=y CONFIG_LOCKDEP_SUPPORT=y CONFIG_STACKTRACE_SUPPORT=y CONFIG_SEMAPHORE_SLEEPERS=y CONFIG_X86=y CONFIG_MMU=y CONFIG_GENERIC_ISA_DMA=y CONFIG_GENERIC_IOMAP=y CONFIG_GENERIC_BUG=y CONFIG_GENERIC_HWEIGHT=y CONFIG_ARCH_MAY_HAVE_PC_FDC=y CONFIG_DMI=y CONFIG_DEFCONFIG_LIST="/lib/modules/$UNAME_RELEASE/.config" CONFIG_EXPERIMENTAL=y CONFIG_BROKEN_ON_SMP=y CONFIG_INIT_ENV_ARG_LIMIT=32 CONFIG_LOCALVERSION="" CONFIG_LOCALVERSION_AUTO=y CONFIG_SWAP=y CONFIG_SYSVIPC=y CONFIG_POSIX_MQUEUE=y CONFIG_BSD_PROCESS_ACCT=y CONFIG_RELAY=y CONFIG_INITRAMFS_SOURCE="usr/initramfs.hades" CONFIG_INITRAMFS_ROOT_UID=99 CONFIG_INITRAMFS_ROOT_GID=101 CONFIG_CC_OPTIMIZE_FOR_SIZE=y CONFIG_SYSCTL=y CONFIG_UID16=y CONFIG_SYSCTL_SYSCALL=y CONFIG_KALLSYMS=y CONFIG_HOTPLUG=y CONFIG_PRINTK=y CONFIG_BUG=y CONFIG_ELF_CORE=y CONFIG_BASE_FULL=y CONFIG_FUTEX=y CONFIG_EPOLL=y CONFIG_SHMEM=y CONFIG_SLAB=y CONFIG_VM_EVENT_COUNTERS=y CONFIG_RT_MUTEXES=y CONFIG_BASE_SMALL=0 CONFIG_MODULES=y CONFIG_MODULE_UNLOAD=y CONFIG_KMOD=y CONFIG_BLOCK=y CONFIG_BLK_DEV_IO_TRACE=y CONFIG_IOSCHED_NOOP=y CONFIG_IOSCHED_AS=m CONFIG_IOSCHED_DEADLINE=m CONFIG_IOSCHED_CFQ=y CONFIG_DEFAULT_CFQ=y CONFIG_DEFAULT_IOSCHED="cfq" CONFIG_X86_PC=y CONFIG_MK7=y CONFIG_X86_CMPXCHG=y CONFIG_X86_XADD=y CONFIG_X86_L1_CACHE_SHIFT=6 CONFIG_RWSEM_XCHGADD_ALGORITHM=y CONFIG_GENERIC_CALIBRATE_DELAY=y CONFIG_X86_WP_WORKS_OK=y CONFIG_X86_INVLPG=y CONFIG_X86_BSWAP=y CONFIG_X86_POPAD_OK=y CONFIG_X86_CMPXCHG64=y CONFIG_X86_GOOD_APIC=y CONFIG_X86_INTEL_USERCOPY=y CONFIG_X86_USE_PPRO_CHECKSUM=y CONFIG_X86_USE_3DNOW=y CONFIG_X86_TSC=y CONFIG_HPET_TIMER=y CONFIG_HPET_EMULATE_RTC=y CONFIG_PREEMPT=y CONFIG_X86_UP_APIC=y CONFIG_X86_UP_IOAPIC=y CONFIG_X86_LOCAL_APIC=y CONFIG_X86_IO_APIC=y CONFIG_X86_MCE=y CONFIG_X86_MCE_NONFATAL=y CONFIG_VM86=y CONFIG_NOHIGHMEM=y CONFIG_PAGE_OFFSET=0xC0000000 CONFIG_PROC_MM=y CONFIG_ARCH_FLATMEM_ENABLE=y CONFIG_ARCH_SPARSEMEM_ENABLE=y CONFIG_ARCH_SELECT_MEMORY_MODEL=y CONFIG_ARCH_POPULATES_NODE_MAP=y CONFIG_SELECT_MEMORY_MODEL=y CONFIG_FLATMEM_MANUAL=y CONFIG_FLATMEM=y CONFIG_FLAT_NODE_MEM_MAP=y CONFIG_SPARSEMEM_STATIC=y CONFIG_SPLIT_PTLOCK_CPUS=4 CONFIG_MTRR=y CONFIG_HZ_1000=y CONFIG_HZ=1000 CONFIG_PHYSICAL_START=0x100000 CONFIG_PHYSICAL_ALIGN=0x100000 CONFIG_PM=y CONFIG_PM_LEGACY=y CONFIG_PCI=y CONFIG_PCI_GOANY=y CONFIG_PCI_BIOS=y CONFIG_PCI_DIRECT=y CONFIG_ISA_DMA_API=y CONFIG_BINFMT_ELF=y CONFIG_BINFMT_MISC=y CONFIG_NET=y CONFIG_PACKET=y CONFIG_PACKET_MMAP=y CONFIG_UNIX=y CONFIG_INET=y CONFIG_IP_MULTICAST=y CONFIG_IP_FIB_HASH=y CONFIG_INET_DIAG=y CONFIG_INET_TCP_DIAG=y CONFIG_TCP_CONG_CUBIC=y CONFIG_DEFAULT_TCP_CONG="cubic" CONFIG_STANDALONE=y CONFIG_PREVENT_FIRMWARE_BUILD=y CONFIG_FW_LOADER=m CONFIG_PARPORT=y CONFIG_PARPORT_PC=y CONFIG_PARPORT_1284=y CONFIG_BLK_DEV_FD=y CONFIG_BLK_DEV_LOOP=m CONFIG_BLK_DEV_CRYPTOLOOP=m CONFIG_BLK_DEV_NBD=m CONFIG_CDROM_PKTCDVD=y CONFIG_CDROM_PKTCDVD_BUFFERS=16 CONFIG_IDE=y CONFIG_BLK_DEV_IDE=y CONFIG_BLK_DEV_IDEDISK=y CONFIG_IDEDISK_MULTI_MODE=y CONFIG_BLK_DEV_IDECD=y CONFIG_IDE_GENERIC=y CONFIG_BLK_DEV_IDEPCI=y CONFIG_IDEPCI_SHARE_IRQ=y CONFIG_BLK_DEV_OFFBOARD=y CONFIG_BLK_DEV_GENERIC=y CONFIG_BLK_DEV_IDEDMA_PCI=y CONFIG_IDEDMA_PCI_AUTO=y CONFIG_BLK_DEV_PDC202XX_NEW=y CONFIG_BLK_DEV_VIA82CXXX=y CONFIG_BLK_DEV_IDEDMA=y CONFIG_IDEDMA_AUTO=y CONFIG_SCSI=y CONFIG_BLK_DEV_SD=y CONFIG_SCSI_SCAN_ASYNC=y CONFIG_MD=y CONFIG_BLK_DEV_DM=y CONFIG_DM_CRYPT=y CONFIG_DM_SNAPSHOT=y CONFIG_DM_MIRROR=y CONFIG_DM_ZERO=y CONFIG_NETDEVICES=y CONFIG_DUMMY=m CONFIG_NET_ETHERNET=y CONFIG_MII=y CONFIG_NET_VENDOR_3COM=y CONFIG_VORTEX=y 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_INPUT_JOYDEV=y CONFIG_INPUT_KEYBOARD=y CONFIG_KEYBOARD_ATKBD=y CONFIG_INPUT_MOUSE=y CONFIG_MOUSE_PS2=y CONFIG_INPUT_JOYSTICK=y CONFIG_JOYSTICK_ANALOG=y CONFIG_INPUT_MISC=y CONFIG_SERIO=y CONFIG_SERIO_I8042=y CONFIG_SERIO_LIBPS2=y CONFIG_GAMEPORT=y CONFIG_GAMEPORT_EMU10K1=y CONFIG_VT=y CONFIG_VT_CONSOLE=y CONFIG_HW_CONSOLE=y CONFIG_SERIAL_8250=y CONFIG_SERIAL_8250_PCI=y CONFIG_SERIAL_8250_NR_UARTS=4 CONFIG_SERIAL_8250_RUNTIME_UARTS=4 CONFIG_SERIAL_CORE=y CONFIG_UNIX98_PTYS=y CONFIG_PRINTER=y CONFIG_RTC=y CONFIG_AGP=y CONFIG_AGP_VIA=y CONFIG_DRM=m CONFIG_DRM_RADEON=m CONFIG_I2C=y CONFIG_I2C_CHARDEV=y CONFIG_I2C_ISA=y CONFIG_I2C_VIAPRO=y CONFIG_HWMON=y CONFIG_HWMON_VID=y CONFIG_SENSORS_W83627HF=y CONFIG_VGA_CONSOLE=y CONFIG_VIDEO_SELECT=y CONFIG_DUMMY_CONSOLE=y CONFIG_SOUND=y CONFIG_SND=y CONFIG_SND_TIMER=y CONFIG_SND_PCM=y CONFIG_SND_HWDEP=y CONFIG_SND_RAWMIDI=y CONFIG_SND_SEQUENCER=y CONFIG_SND_SEQ_DUMMY=m CONFIG_SND_OSSEMUL=y CONFIG_SND_MIXER_OSS=y CONFIG_SND_PCM_OSS=y CONFIG_SND_PCM_OSS_PLUGINS=y CONFIG_SND_SEQUENCER_OSS=y CONFIG_SND_RTCTIMER=y CONFIG_SND_SEQ_RTCTIMER_DEFAULT=y CONFIG_SND_SUPPORT_OLD_API=y CONFIG_SND_VERBOSE_PROCFS=y CONFIG_SND_MPU401_UART=m CONFIG_SND_AC97_CODEC=y CONFIG_SND_MPU401=m CONFIG_SND_EMU10K1=y CONFIG_SND_INTEL8X0=y CONFIG_AC97_BUS=y CONFIG_USB_ARCH_HAS_HCD=y CONFIG_USB_ARCH_HAS_OHCI=y CONFIG_USB_ARCH_HAS_EHCI=y CONFIG_USB=y CONFIG_USB_DEVICEFS=y CONFIG_USB_BANDWIDTH=y CONFIG_USB_DYNAMIC_MINORS=y CONFIG_USB_UHCI_HCD=y CONFIG_USB_PRINTER=y CONFIG_USB_STORAGE=y CONFIG_EXT2_FS=y CONFIG_EXT2_FS_XATTR=y CONFIG_EXT2_FS_POSIX_ACL=y CONFIG_EXT3_FS=y CONFIG_EXT3_FS_XATTR=y CONFIG_EXT3_FS_POSIX_ACL=y CONFIG_JBD=y CONFIG_FS_MBCACHE=y CONFIG_REISERFS_FS=y CONFIG_REISERFS_FS_XATTR=y CONFIG_REISERFS_FS_POSIX_ACL=y CONFIG_FS_POSIX_ACL=y CONFIG_INOTIFY=y CONFIG_INOTIFY_USER=y CONFIG_QUOTA=y CONFIG_QFMT_V2=y CONFIG_QUOTACTL=y CONFIG_DNOTIFY=y CONFIG_FUSE_FS=y CONFIG_GENERIC_ACL=y CONFIG_ISO9660_FS=y CONFIG_JOLIET=y CONFIG_ZISOFS=y CONFIG_ZISOFS_FS=y CONFIG_UDF_FS=y CONFIG_UDF_NLS=y CONFIG_FAT_FS=y CONFIG_MSDOS_FS=y CONFIG_VFAT_FS=m CONFIG_FAT_DEFAULT_CODEPAGE=437 CONFIG_FAT_DEFAULT_IOCHARSET="iso8859-1" CONFIG_PROC_FS=y CONFIG_PROC_SYSCTL=y CONFIG_SYSFS=y CONFIG_TMPFS=y CONFIG_TMPFS_POSIX_ACL=y CONFIG_HUGETLBFS=y CONFIG_HUGETLB_PAGE=y CONFIG_RAMFS=y CONFIG_CONFIGFS_FS=y CONFIG_NFS_FS=y CONFIG_NFS_V3=y CONFIG_NFS_V3_ACL=y CONFIG_NFSD=y CONFIG_NFSD_V2_ACL=y CONFIG_NFSD_V3=y CONFIG_NFSD_V3_ACL=y CONFIG_NFSD_TCP=y CONFIG_LOCKD=y CONFIG_LOCKD_V4=y CONFIG_EXPORTFS=y CONFIG_NFS_ACL_SUPPORT=y CONFIG_NFS_COMMON=y CONFIG_SUNRPC=y CONFIG_PARTITION_ADVANCED=y CONFIG_MSDOS_PARTITION=y CONFIG_NLS=y CONFIG_NLS_DEFAULT="iso8859-1" CONFIG_NLS_CODEPAGE_437=y CONFIG_NLS_ASCII=m CONFIG_NLS_ISO8859_1=y CONFIG_NLS_ISO8859_15=m CONFIG_NLS_UTF8=m CONFIG_PROFILING=y CONFIG_OPROFILE=y CONFIG_KPROBES=y CONFIG_TRACE_IRQFLAGS_SUPPORT=y CONFIG_ENABLE_MUST_CHECK=y CONFIG_DEBUG_FS=y CONFIG_LOG_BUF_SHIFT=14 CONFIG_DEBUG_BUGVERBOSE=y CONFIG_EARLY_PRINTK=y CONFIG_X86_FIND_SMP_CONFIG=y CONFIG_X86_MPPARSE=y CONFIG_DOUBLEFAULT=y CONFIG_CRYPTO=y CONFIG_CRYPTO_ALGAPI=y CONFIG_CRYPTO_BLKCIPHER=y CONFIG_CRYPTO_MANAGER=y CONFIG_CRYPTO_ECB=m CONFIG_CRYPTO_CBC=y CONFIG_CRYPTO_TWOFISH_COMMON=m CONFIG_CRYPTO_TWOFISH_586=m CONFIG_BITREVERSE=y CONFIG_CRC32=y CONFIG_ZLIB_INFLATE=y CONFIG_PLIST=y CONFIG_IOMAP_COPY=y CONFIG_GENERIC_HARDIRQS=y CONFIG_GENERIC_IRQ_PROBE=y CONFIG_X86_BIOS_REBOOT=y CONFIG_KTIME_SCALAR=y -- `In the future, company names will be a 32-character hex string.' --- Bruce Schneier on the shortage of company names - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to [EMAIL PROTECTED] More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/