Re: [patch] Real-Time Preemption, -RT-2.6.12-rc6-V0.7.48-00

[William Weston <weston@sysex.net>]

Hi Ingo,

I just found this oops from last night on my home audio/midi system
(AthlonXP running -48-37).  I was burning a CD at the time, and the scsi
error precedes the oops trace by 46 seconds.  The system is still up and 
fully functional, BTW.

scsi: unknown opcode 0x01
BUG: Unable to handle kernel NULL pointer dereference at virtual address 
00000009
 printing eip:
c044d001
*pde = 00000000
Oops: 0002 [#1]
PREEMPT 
Modules linked in: snd_seq_dummy snd_seq_oss snd_seq_midi it87 eeprom i2c_sensor i2c_isa i2c_viapro i2c_dev i2c_core realtime usbhid ohci1394 ieee1394 uhci_hcd ehci_hcd usbcore snd_emu10k1_synth snd_emux_synth snd_seq_virmidi snd_seq_midi_event snd_seq_midi_emul snd_seq snd_emu10k1 snd_util_mem snd_hwdep snd_mpu401 snd_via82xx snd_mpu401_uart snd_cs46xx gameport snd_rawmidi snd_seq_device snd_ac97_codec snd_pcm_oss snd_mixer_oss snd_pcm snd_timer snd soundcore snd_page_alloc
CPU:    0
EIP:    0060:[<c044d001>]    Not tainted VLI
EFLAGS: 00010007   (2.6.12-rc6-RT-V0.7.48-37) 
EIP is at setup_IO_APIC+0x4d1/0x4f0
eax: 00000200   ebx: c04372c0   ecx: 00000009   edx: 00024201
esi: 00000010   edi: df096000   ebp: 00000000   esp: df097f84
ds: 007b   es: 007b   ss: 0068   preempt: 00000002
Process IRQ 16 (pid: 2163, threadinfo=df096000 task=df7e5230)
Stack: c01149db c04372c0 00000010 c013ee34 ffffff10 dfbd58e0 df096000 c04372c0 
       c04372c0 c013eee0 c013ef44 00000873 00000001 df097fbc 00000025 df096000 
       df203e3c c0131265 fffffffc ffffffff ffffffff c01311d0 00000000 00000000 
Call Trace:
 [<c01149db>] end_level_ioapic_irq+0x4b/0xa0 (4)
 [<c013ee34>] do_hardirq+0x94/0x140 (12)
 [<c013eee0>] do_irqd+0x0/0xa0 (24)
 [<c013ef44>] do_irqd+0x64/0xa0 (4)
 [<c0131265>] kthread+0x95/0xd0 (28)
 [<c01311d0>] kthread+0x0/0xd0 (16)
 [<c010138d>] kernel_thread_helper+0x5/0x18 (16)
Code: e6 00 e6 e6 e6 00 e6 e6 e6 00 e6 e6 e6 00 e6 e6 e6 00 e6 e6 e6 00 e6 
e6 e6 00 e6 e6 e6 00 e6 e6 e6 00 e6 e6 e6 00 e6 e6 e6 00 fe <31> 09 00 0c 
00 01 02 2e 00 00 00 55 24 10 00 0c 00 02 02 2e 2e 
 <6>note: IRQ 16[2163] exited with preempt_count 1
BUG: scheduling while atomic: IRQ 16/0x00000001/2163
caller is do_exit+0x211/0x3b0
 [<c030e8d5>] __schedule+0x555/0x710 (8)
 [<c011ee2c>] exit_notify+0x54c/0x8a0 (24)
 [<c0117c19>] wake_up_process+0x19/0x20 (4)
 [<c011f391>] do_exit+0x211/0x3b0 (52)
 [<c010443b>] die+0x16b/0x170 (40)
 [<c01162bd>] do_page_fault+0x34d/0x540 (64)
 [<c0117948>] recalc_task_prio+0x88/0x160 (16)
 [<c030e6e0>] __schedule+0x360/0x710 (36)
 [<c0117bef>] try_to_wake_up+0x11f/0x130 (12)
 [<c0117c19>] wake_up_process+0x19/0x20 (20)
 [<c030ec8f>] preempt_schedule_irq+0x4f/0x70 (48)
 [<c010313c>] need_resched+0x20/0x24 (20)
 [<c0115f70>] do_page_fault+0x0/0x540 (48)
 [<c0103c83>] error_code+0x4f/0x54 (8)
 [<c044d001>] setup_IO_APIC+0x4d1/0x4f0 (44)
 [<c01149db>] end_level_ioapic_irq+0x4b/0xa0 (12)
 [<c013ee34>] do_hardirq+0x94/0x140 (12)
 [<c013eee0>] do_irqd+0x0/0xa0 (24)
 [<c013ef44>] do_irqd+0x64/0xa0 (4)
 [<c0131265>] kthread+0x95/0xd0 (28)
 [<c01311d0>] kthread+0x0/0xd0 (16)
 [<c010138d>] kernel_thread_helper+0x5/0x18 (16)
prev->state: 2 != TASK_RUNNING??
IRQ 16/2163: BUG in __schedule at kernel/sched.c:2968
 [<c030e85c>] __schedule+0x4dc/0x710 (8)
 [<c0117c19>] wake_up_process+0x19/0x20 (28)
 [<c011f391>] do_exit+0x211/0x3b0 (52)
 [<c010443b>] die+0x16b/0x170 (40)
 [<c01162bd>] do_page_fault+0x34d/0x540 (64)
 [<c0117948>] recalc_task_prio+0x88/0x160 (16)
 [<c030e6e0>] __schedule+0x360/0x710 (36)
 [<c0117bef>] try_to_wake_up+0x11f/0x130 (12)
 [<c0117c19>] wake_up_process+0x19/0x20 (20)
 [<c030ec8f>] preempt_schedule_irq+0x4f/0x70 (48)
 [<c010313c>] need_resched+0x20/0x24 (20)
 [<c0115f70>] do_page_fault+0x0/0x540 (48)
 [<c0103c83>] error_code+0x4f/0x54 (8)
 [<c044d001>] setup_IO_APIC+0x4d1/0x4f0 (44)
 [<c01149db>] end_level_ioapic_irq+0x4b/0xa0 (12)
 [<c013ee34>] do_hardirq+0x94/0x140 (12)
 [<c013eee0>] do_irqd+0x0/0xa0 (24)
 [<c013ef44>] do_irqd+0x64/0xa0 (4)
 [<c0131265>] kthread+0x95/0xd0 (28)
 [<c01311d0>] kthread+0x0/0xd0 (16)
 [<c010138d>] kernel_thread_helper+0x5/0x18 (16)

Is this something you've already fixed in the -50-xx series?  My build of
-50-15 just finished, so I'll reboot and hammer on the cd burner with the 
latest, anyway.

--ww

CONFIG_X86=y
CONFIG_MMU=y
CONFIG_UID16=y
CONFIG_GENERIC_ISA_DMA=y
CONFIG_GENERIC_IOMAP=y
CONFIG_EXPERIMENTAL=y
CONFIG_BROKEN=y
CONFIG_BROKEN_ON_SMP=y
CONFIG_LOCK_KERNEL=y
CONFIG_INIT_ENV_ARG_LIMIT=32
CONFIG_LOCALVERSION=""
CONFIG_SWAP=y
CONFIG_SYSVIPC=y
CONFIG_POSIX_MQUEUE=y
CONFIG_BSD_PROCESS_ACCT=y
CONFIG_SYSCTL=y
CONFIG_AUDIT=y
CONFIG_AUDITSYSCALL=y
CONFIG_HOTPLUG=y
CONFIG_KOBJECT_UEVENT=y
CONFIG_IKCONFIG=y
CONFIG_IKCONFIG_PROC=y
CONFIG_KALLSYMS=y
CONFIG_KALLSYMS_ALL=y
CONFIG_PRINTK=y
CONFIG_BUG=y
CONFIG_BASE_FULL=y
CONFIG_FUTEX=y
CONFIG_EPOLL=y
CONFIG_SHMEM=y
CONFIG_CC_ALIGN_FUNCTIONS=0
CONFIG_CC_ALIGN_LABELS=0
CONFIG_CC_ALIGN_LOOPS=0
CONFIG_CC_ALIGN_JUMPS=0
CONFIG_BASE_SMALL=0
CONFIG_MODULES=y
CONFIG_MODULE_UNLOAD=y
CONFIG_MODULE_FORCE_UNLOAD=y
CONFIG_OBSOLETE_MODPARM=y
CONFIG_MODVERSIONS=y
CONFIG_MODULE_SRCVERSION_ALL=y
CONFIG_KMOD=y
CONFIG_X86_PC=y
CONFIG_MK7=y
CONFIG_X86_CMPXCHG=y
CONFIG_X86_XADD=y
CONFIG_X86_L1_CACHE_SHIFT=6
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_GOOD_APIC=y
CONFIG_X86_INTEL_USERCOPY=y
CONFIG_X86_USE_PPRO_CHECKSUM=y
CONFIG_HPET_TIMER=y
CONFIG_HPET_EMULATE_RTC=y
CONFIG_PREEMPT_RT=y
CONFIG_PREEMPT=y
CONFIG_PREEMPT_SOFTIRQS=y
CONFIG_PREEMPT_HARDIRQS=y
CONFIG_PREEMPT_RCU=y
CONFIG_PREEMPT_BKL=y
CONFIG_RWSEM_GENERIC_SPINLOCK=y
CONFIG_ASM_SEMAPHORES=y
CONFIG_X86_UP_APIC=y
CONFIG_X86_UP_IOAPIC=y
CONFIG_X86_LOCAL_APIC=y
CONFIG_X86_IO_APIC=y
CONFIG_X86_TSC=y
CONFIG_X86_MCE=y
CONFIG_X86_MCE_NONFATAL=y
CONFIG_MICROCODE=m
CONFIG_X86_MSR=m
CONFIG_X86_CPUID=m
CONFIG_NOHIGHMEM=y
CONFIG_MTRR=y
CONFIG_HAVE_DEC_LOCK=y
CONFIG_REGPARM=y
CONFIG_SECCOMP=y
CONFIG_PM=y
CONFIG_ACPI=y
CONFIG_ACPI_BOOT=y
CONFIG_ACPI_INTERPRETER=y
CONFIG_ACPI_SLEEP=y
CONFIG_ACPI_SLEEP_PROC_FS=y
CONFIG_ACPI_PROCESSOR=y
CONFIG_ACPI_THERMAL=y
CONFIG_ACPI_BLACKLIST_YEAR=0
CONFIG_ACPI_DEBUG=y
CONFIG_ACPI_BUS=y
CONFIG_ACPI_EC=y
CONFIG_ACPI_POWER=y
CONFIG_ACPI_PCI=y
CONFIG_ACPI_SYSTEM=y
CONFIG_X86_PM_TIMER=y
CONFIG_APM=y
CONFIG_APM_RTC_IS_GMT=y
CONFIG_APM_REAL_MODE_POWER_OFF=y
CONFIG_PCI=y
CONFIG_PCI_GOANY=y
CONFIG_PCI_BIOS=y
CONFIG_PCI_DIRECT=y
CONFIG_PCI_MMCONFIG=y
CONFIG_PCI_LEGACY_PROC=y
CONFIG_PCI_NAMES=y
CONFIG_ISA_DMA_API=y
CONFIG_ISA=y
CONFIG_BINFMT_ELF=y
CONFIG_BINFMT_MISC=y
CONFIG_STANDALONE=y
CONFIG_PREVENT_FIRMWARE_BUILD=y
CONFIG_PNP=y
CONFIG_ISAPNP=y
CONFIG_PNPACPI=y
CONFIG_BLK_DEV_FD=y
CONFIG_BLK_DEV_LOOP=y
CONFIG_BLK_DEV_RAM=m
CONFIG_BLK_DEV_RAM_COUNT=16
CONFIG_BLK_DEV_RAM_SIZE=16384
CONFIG_INITRAMFS_SOURCE=""
CONFIG_CDROM_PKTCDVD=y
CONFIG_CDROM_PKTCDVD_BUFFERS=128
CONFIG_IOSCHED_NOOP=y
CONFIG_IOSCHED_AS=y
CONFIG_IOSCHED_DEADLINE=y
CONFIG_IOSCHED_CFQ=y
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_TASK_IOCTL=y
CONFIG_IDE_GENERIC=y
CONFIG_BLK_DEV_IDEPNP=y
CONFIG_BLK_DEV_IDEPCI=y
CONFIG_IDEPCI_SHARE_IRQ=y
CONFIG_BLK_DEV_GENERIC=y
CONFIG_BLK_DEV_IDEDMA_PCI=y
CONFIG_IDEDMA_PCI_AUTO=y
CONFIG_BLK_DEV_VIA82CXXX=y
CONFIG_BLK_DEV_IDEDMA=y
CONFIG_IDEDMA_AUTO=y
CONFIG_IEEE1394=m
CONFIG_IEEE1394_OUI_DB=y
CONFIG_IEEE1394_EXTRA_CONFIG_ROMS=y
CONFIG_IEEE1394_CONFIG_ROM_IP1394=y
CONFIG_IEEE1394_OHCI1394=m
CONFIG_IEEE1394_VIDEO1394=m
CONFIG_IEEE1394_ETH1394=m
CONFIG_IEEE1394_DV1394=m
CONFIG_IEEE1394_RAWIO=m
CONFIG_IEEE1394_CMP=m
CONFIG_IEEE1394_AMDTP=m
CONFIG_NET=y
CONFIG_PACKET=y
CONFIG_PACKET_MMAP=y
CONFIG_UNIX=y
CONFIG_NET_KEY=y
CONFIG_INET=y
CONFIG_IP_MULTICAST=y
CONFIG_IP_TCPDIAG=y
CONFIG_XFRM=y
CONFIG_NETDEVICES=y
CONFIG_TUN=y
CONFIG_NET_ETHERNET=y
CONFIG_MII=y
CONFIG_NET_PCI=y
CONFIG_VIA_RHINE=y
CONFIG_VIA_RHINE_MMIO=y
CONFIG_INPUT=y
CONFIG_INPUT_MOUSEDEV=y
CONFIG_INPUT_MOUSEDEV_PSAUX=y
CONFIG_INPUT_MOUSEDEV_SCREEN_X=1280
CONFIG_INPUT_MOUSEDEV_SCREEN_Y=1024
CONFIG_INPUT_JOYDEV=y
CONFIG_INPUT_EVDEV=y
CONFIG_INPUT_KEYBOARD=y
CONFIG_KEYBOARD_ATKBD=y
CONFIG_INPUT_MOUSE=y
CONFIG_MOUSE_PS2=y
CONFIG_INPUT_JOYSTICK=y
CONFIG_INPUT_MISC=y
CONFIG_INPUT_PCSPKR=y
CONFIG_SERIO=y
CONFIG_SERIO_I8042=y
CONFIG_SERIO_LIBPS2=y
CONFIG_GAMEPORT=m
CONFIG_GAMEPORT_CS461X=m
CONFIG_VT=y
CONFIG_VT_CONSOLE=y
CONFIG_HW_CONSOLE=y
CONFIG_SERIAL_8250=y
CONFIG_SERIAL_8250_CONSOLE=y
CONFIG_SERIAL_8250_NR_UARTS=2
CONFIG_SERIAL_8250_EXTENDED=y
CONFIG_SERIAL_8250_SHARE_IRQ=y
CONFIG_SERIAL_8250_DETECT_IRQ=y
CONFIG_SERIAL_CORE=y
CONFIG_SERIAL_CORE_CONSOLE=y
CONFIG_UNIX98_PTYS=y
CONFIG_HW_RANDOM=y
CONFIG_RTC=y
CONFIG_BLOCKER=m
CONFIG_AGP=y
CONFIG_AGP_VIA=y
CONFIG_DRM=y
CONFIG_DRM_RADEON=y
CONFIG_HPET=y
CONFIG_HPET_MMAP=y
CONFIG_I2C=m
CONFIG_I2C_CHARDEV=m
CONFIG_I2C_ISA=m
CONFIG_I2C_VIAPRO=m
CONFIG_I2C_SENSOR=m
CONFIG_SENSORS_IT87=m
CONFIG_SENSORS_EEPROM=m
CONFIG_VIDEO_SELECT=y
CONFIG_VGA_CONSOLE=y
CONFIG_DUMMY_CONSOLE=y
CONFIG_SOUND=m
CONFIG_SND=m
CONFIG_SND_TIMER=m
CONFIG_SND_PCM=m
CONFIG_SND_HWDEP=m
CONFIG_SND_RAWMIDI=m
CONFIG_SND_SEQUENCER=m
CONFIG_SND_SEQ_DUMMY=m
CONFIG_SND_OSSEMUL=y
CONFIG_SND_MIXER_OSS=m
CONFIG_SND_PCM_OSS=m
CONFIG_SND_SEQUENCER_OSS=y
CONFIG_SND_RTCTIMER=m
CONFIG_SND_MPU401_UART=m
CONFIG_SND_DUMMY=m
CONFIG_SND_VIRMIDI=m
CONFIG_SND_SERIAL_U16550=m
CONFIG_SND_MPU401=m
CONFIG_SND_AC97_CODEC=m
CONFIG_SND_CS46XX=m
CONFIG_SND_CS46XX_NEW_DSP=y
CONFIG_SND_EMU10K1=m
CONFIG_SND_CA0106=m
CONFIG_SND_VIA82XX=m
CONFIG_USB_ARCH_HAS_HCD=y
CONFIG_USB_ARCH_HAS_OHCI=y
CONFIG_USB=m
CONFIG_USB_DEVICEFS=y
CONFIG_USB_EHCI_HCD=m
CONFIG_USB_EHCI_SPLIT_ISO=y
CONFIG_USB_EHCI_ROOT_HUB_TT=y
CONFIG_USB_UHCI_HCD=m
CONFIG_USB_AUDIO=m
CONFIG_USB_MIDI=m
CONFIG_USB_HID=m
CONFIG_USB_HIDINPUT=y
CONFIG_HID_FF=y
CONFIG_LOGITECH_FF=y
CONFIG_USB_HIDDEV=y
CONFIG_EXT2_FS=y
CONFIG_EXT2_FS_XATTR=y
CONFIG_EXT2_FS_POSIX_ACL=y
CONFIG_EXT2_FS_SECURITY=y
CONFIG_EXT3_FS=y
CONFIG_EXT3_FS_XATTR=y
CONFIG_EXT3_FS_POSIX_ACL=y
CONFIG_EXT3_FS_SECURITY=y
CONFIG_JBD=y
CONFIG_JBD_DEBUG=y
CONFIG_FS_MBCACHE=y
CONFIG_FS_POSIX_ACL=y
CONFIG_ROMFS_FS=m
CONFIG_DNOTIFY=y
CONFIG_ISO9660_FS=y
CONFIG_JOLIET=y
CONFIG_ZISOFS=y
CONFIG_ZISOFS_FS=y
CONFIG_UDF_FS=m
CONFIG_UDF_NLS=y
CONFIG_FAT_FS=m
CONFIG_MSDOS_FS=m
CONFIG_VFAT_FS=m
CONFIG_FAT_DEFAULT_CODEPAGE=437
CONFIG_FAT_DEFAULT_IOCHARSET="ascii"
CONFIG_PROC_FS=y
CONFIG_PROC_KCORE=y
CONFIG_SYSFS=y
CONFIG_DEVPTS_FS_XATTR=y
CONFIG_DEVPTS_FS_SECURITY=y
CONFIG_TMPFS=y
CONFIG_TMPFS_XATTR=y
CONFIG_TMPFS_SECURITY=y
CONFIG_HUGETLBFS=y
CONFIG_HUGETLB_PAGE=y
CONFIG_RAMFS=y
CONFIG_HFS_FS=m
CONFIG_HFSPLUS_FS=m
CONFIG_CRAMFS=m
CONFIG_SMB_FS=m
CONFIG_CIFS=m
CONFIG_CIFS_XATTR=y
CONFIG_CIFS_POSIX=y
CONFIG_PARTITION_ADVANCED=y
CONFIG_ATARI_PARTITION=y
CONFIG_MAC_PARTITION=y
CONFIG_MSDOS_PARTITION=y
CONFIG_NLS=y
CONFIG_NLS_DEFAULT="utf8"
CONFIG_NLS_CODEPAGE_437=y
CONFIG_NLS_CODEPAGE_850=y
CONFIG_NLS_CODEPAGE_852=y
CONFIG_NLS_CODEPAGE_1250=y
CONFIG_NLS_ASCII=y
CONFIG_NLS_ISO8859_1=y
CONFIG_NLS_ISO8859_2=y
CONFIG_NLS_ISO8859_15=y
CONFIG_NLS_UTF8=y
CONFIG_PROFILING=y
CONFIG_DEBUG_KERNEL=y
CONFIG_MAGIC_SYSRQ=y
CONFIG_LOG_BUF_SHIFT=18
CONFIG_WAKEUP_TIMING=y
CONFIG_LATENCY_TIMING=y
CONFIG_DEBUG_BUGVERBOSE=y
CONFIG_DEBUG_INFO=y
CONFIG_EARLY_PRINTK=y
CONFIG_X86_FIND_SMP_CONFIG=y
CONFIG_X86_MPPARSE=y
CONFIG_SECURITY=y
CONFIG_SECURITY_NETWORK=y
CONFIG_SECURITY_CAPABILITIES=m
CONFIG_SECURITY_SECLVL=m
CONFIG_SECURITY_SELINUX=y
CONFIG_SECURITY_SELINUX_BOOTPARAM=y
CONFIG_SECURITY_SELINUX_BOOTPARAM_VALUE=1
CONFIG_SECURITY_SELINUX_DEVELOP=y
CONFIG_SECURITY_SELINUX_AVC_STATS=y
CONFIG_SECURITY_SELINUX_CHECKREQPROT_VALUE=1
CONFIG_CRYPTO=y
CONFIG_CRYPTO_MD5=y
CONFIG_CRYPTO_SHA1=y
CONFIG_CRYPTO_DES=y
CONFIG_CRYPTO_CRC32C=y
CONFIG_CRC_CCITT=y
CONFIG_CRC32=y
CONFIG_LIBCRC32C=y
CONFIG_ZLIB_INFLATE=y
CONFIG_GENERIC_HARDIRQS=y
CONFIG_GENERIC_IRQ_PROBE=y
CONFIG_X86_BIOS_REBOOT=y
CONFIG_PC=y