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    SubjectPROBLEM: 3.0-rc kernels unbootable since -rc3
    From
    None of my kernels after 3.0-rc3 will boot on my Dell XPS-M1730
    (x86-64 2-core) test box running
    Ubuntu (Kubuntu) 11.04 (i.e. the first unbootable one was -rc4).
    The machine freezes immediately after selecting the kernel from the
    bootloader menu, leaving
    me with a blank blue screen so I can't give you any log messages.

    It bisects to the following commit:

    commit a46e0899eec7a3069bcadd45dfba7bf67c6ed016
    Author: Paul E. McKenney <paulmck@linux.vnet.ibm.com>
    Date: Wed Jun 15 15:47:09 2011 -0700

    rcu: use softirq instead of kthreads except when RCU_BOOST=y

    This patch #ifdefs RCU kthreads out of the kernel unless RCU_BOOST=y,
    thus eliminating context-switch overhead if RCU priority boosting has
    not been configured.

    Signed-off-by: Paul E. McKenney <paulmck@linux.vnet.ibm.com>

    I've tried cherry-picking onto good/reverting from bad but I don't
    know what to do with the merge
    conflicts, somebody who knows the code/design needs to look really.
    There are more changes than a
    couple of simple #ifdefs.

    Let me know if you need any further info.

    The config of the bad kernel will follow in next email, while you're
    waiting here's some nice
    environment info from a good kernel bisected nearest to the offending
    commit for you to enjoy
    looking at :-)

    ----------
    ver_linux:
    Linux julie-MXG071 3.0.0-rc2-bisect-8+ #11 SMP Tue Jul 5 20:50:02 BST
    2011 x86_64 x86_64 x86_64 GNU/Linux

    Gnu C 4.5.2
    Gnu make 3.81
    binutils 2.21.0.20110327
    util-linux 2.17.2
    mount support
    module-init-tools 3.12
    e2fsprogs 1.41.14
    pcmciautils 015
    Linux C Library 2.13
    Dynamic linker (ldd) 2.13
    Procps 3.2.8
    Net-tools 1.60
    Kbd 1.15
    Sh-utils 8.5
    wireless-tools 30
    Modules Loaded nouveau uvcvideo r852 sm_common videodev
    iwl4965 nand nand_ids dell_wmi sdhci_pci sdhci nand_ecc firewire_ohci
    mtd dell_laptop v4l2_compat_ioctl32 mmc_core firewire_core ttm
    iwl_legacy drm_kms_helper mxm_wmi intel_agp intel_gtt

    ------------------
    cat /proc/cpuinfo:
    processor : 0
    vendor_id : GenuineIntel
    cpu family : 6
    model : 23
    model name : Intel(R) Core(TM)2 Duo CPU T8300 @ 2.40GHz
    stepping : 6
    cpu MHz : 2401.000
    cache size : 3072 KB
    physical id : 0
    siblings : 2
    core id : 0
    cpu cores : 2
    apicid : 0
    initial apicid : 0
    fpu : yes
    fpu_exception : yes
    cpuid level : 10
    wp : yes
    flags : fpu vme de pse tsc msr pae mce cx8 apic sep mtrr pge
    mca cmov pat pse36 clflush dts acpi mmx fxsr sse sse2 ss ht tm pbe
    syscall nx lm constant_tsc arch_perfmon pebs bts rep_good nopl
    aperfmperf pni dtes64 monitor ds_cpl vmx est tm2 ssse3 cx16 xtpr pdcm
    sse4_1 lahf_lm ida dts tpr_shadow vnmi flexpriority
    bogomips : 4787.29
    clflush size : 64
    cache_alignment : 64
    address sizes : 36 bits physical, 48 bits virtual
    power management:

    processor : 1
    vendor_id : GenuineIntel
    cpu family : 6
    model : 23
    model name : Intel(R) Core(TM)2 Duo CPU T8300 @ 2.40GHz
    stepping : 6
    cpu MHz : 800.000
    cache size : 3072 KB
    physical id : 0
    siblings : 2
    core id : 1
    cpu cores : 2
    apicid : 1
    initial apicid : 1
    fpu : yes
    fpu_exception : yes
    cpuid level : 10
    wp : yes
    flags : fpu vme de pse tsc msr pae mce cx8 apic sep mtrr pge
    mca cmov pat pse36 clflush dts acpi mmx fxsr sse sse2 ss ht tm pbe
    syscall nx lm constant_tsc arch_perfmon pebs bts rep_good nopl
    aperfmperf pni dtes64 monitor ds_cpl vmx est tm2 ssse3 cx16 xtpr pdcm
    sse4_1 lahf_lm ida dts tpr_shadow vnmi flexpriority
    bogomips : 4787.46
    clflush size : 64
    cache_alignment : 64
    address sizes : 36 bits physical, 48 bits virtual
    power management:

    ------------------
    cat /proc/modules:
    nouveau 555654 2 - Live 0xffffffffa0124000
    uvcvideo 56906 0 - Live 0xffffffffa0115000
    r852 10128 0 - Live 0xffffffffa0058000
    sm_common 7684 1 r852, Live 0xffffffffa002e000
    videodev 73451 1 uvcvideo, Live 0xffffffffa0102000
    iwl4965 155443 0 - Live 0xffffffffa00db000
    nand 41249 2 r852,sm_common, Live 0xffffffffa006d000
    nand_ids 5858 1 nand, Live 0xffffffffa0017000
    dell_wmi 1625 0 - Live 0xffffffffa0010000
    sdhci_pci 8832 0 - Live 0xffffffffa002a000
    sdhci 22896 1 sdhci_pci, Live 0xffffffffa0023000
    nand_ecc 3888 1 nand, Live 0xffffffffa0009000
    firewire_ohci 26259 0 - Live 0xffffffffa00d3000
    mtd 28256 2 sm_common,nand, Live 0xffffffffa00c7000
    dell_laptop 8899 0 - Live 0xffffffffa00c0000
    v4l2_compat_ioctl32 7213 1 videodev, Live 0xffffffffa00bb000
    mmc_core 76861 1 sdhci, Live 0xffffffffa009f000
    firewire_core 51699 1 firewire_ohci, Live 0xffffffffa008b000
    ttm 58297 1 nouveau, Live 0xffffffffa005d000
    iwl_legacy 122602 1 iwl4965, Live 0xffffffffa0033000
    drm_kms_helper 26926 1 nouveau, Live 0xffffffffa001b000
    mxm_wmi 1695 1 nouveau, Live 0xffffffffa0013000
    intel_agp 11475 0 - Live 0xffffffffa000c000
    intel_gtt 14036 1 intel_agp, Live 0xffffffffa0004000


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