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    Subject2.6.34-rc2: cpu hotplug test failure on x86_64
    Running cpu hotplug tests on a x86_64 box results in
    the following BUG.

    BUG: unable to handle kernel NULL pointer dereference at 0000000000000004
    IP: [<ffffffff81037388>] amd_pmu_cpu_offline+0x38/0x67
    PGD 0
    Oops: 0000 [#1] SMP
    last sysfs file: /sys/devices/system/cpu/cpu1/online
    CPU 0
    Modules linked in: ipv6 fuse loop dm_mod sg bnx2 rtc_cmos mptctl rtc_core i2c_piix4 rtc_lib serio_raw pcspkr shpchp button i2c_core k8temp pci_hotplug ohci_hcd ehci_hcd sd_mod crc_t10dif usbcore edd ext3 jbd fan thermal processor thermal_sys hwmon mptsas mptscsih mptbase scsi_transport_sas scsi_mod

    Pid: 7657, comm: bash Not tainted 2.6.34-rc2-autotest #1 Server Blade/BladeCenter LS21 -[79716AA]-
    RIP: 0010:[<ffffffff81037388>] [<ffffffff81037388>] amd_pmu_cpu_offline+0x38/0x67
    RSP: 0018:ffff880129e11d88 EFLAGS: 00010246
    RAX: 0000000000000001 RBX: ffff88000608b6f0 RCX: ffffffff8178f3f0
    RDX: 0000000000000000 RSI: 0000000000000007 RDI: ffffffff81930f94
    RBP: ffff880129e11d98 R08: 0000000000000000 R09: ffff880129e11ca8
    R10: 0000000000000000 R11: 0000000000018600 R12: 00000000fffffffd
    R13: ffffffff8179f4e0 R14: 0000000000000001 R15: 0000000000000007
    FS: 00007f7e4c9346f0(0000) GS:ffff880006000000(0000) knlGS:0000000000000000
    CS: 0010 DS: 0000 ES: 0000 CR0: 000000008005003b
    CR2: 0000000000000004 CR3: 0000000129f51000 CR4: 00000000000006f0
    DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
    DR3: 0000000000000000 DR6: 00000000ffff0ff0 DR7: 0000000000000400
    Process bash (pid: 7657, threadinfo ffff880129e10000, task ffff88012850b1e0)
    Stack:
    ffff880129e11d98 0000000000000000 ffff880129e11da8 ffffffff81388ab3
    <0> ffff880129e11de8 ffffffff8139474e 0000000000000001 ffffffff8184c5e0
    <0> 0000000000000001 0000000000000000 0000000000000000 0000000000000001
    Call Trace:
    [<ffffffff81388ab3>] x86_pmu_notifier+0x51/0x58
    [<ffffffff8139474e>] notifier_call_chain+0x33/0x5b
    [<ffffffff810838e0>] raw_notifier_call_chain+0xf/0x11
    [<ffffffff8137d5b1>] _cpu_down+0x1ed/0x2f3
    [<ffffffff8107c5ce>] ? __create_workqueue_key+0x204/0x22c
    [<ffffffff8137d6f0>] cpu_down+0x39/0x53
    [<ffffffff8137f58e>] store_online+0x2c/0x6f
    [<ffffffff812c3707>] sysdev_store+0x1b/0x1d
    [<ffffffff8116bfc0>] sysfs_write_file+0xdf/0x114
    [<ffffffff8111810e>] vfs_write+0xae/0x16a
    [<ffffffff8111828e>] sys_write+0x47/0x6e
    [<ffffffff810299ab>] system_call_fastpath+0x16/0x1b
    Code: b6 80 00 01 76 4f 48 63 c7 48 c7 c3 f0 b6 00 00 48 c7 c7 94 0f 93 81 48 03 1c c5 c0 2e 84 81 e8 00 a2 35 00 48 8b 93 28 07 00 00 <8b> 42 04 ff c8 85 c0 89 42 04 75 0c 48 8b bb 28 07 00 00 e8 ae
    RIP [<ffffffff81037388>] amd_pmu_cpu_offline+0x38/0x67
    RSP <ffff880129e11d88>
    CR2: 0000000000000004
    ---[ end trace d44efb4255454e5f ]---

    The problem seem to have been introduced in 2.6.34-rc1-git8(397104793...)
    I haven't tried a git bisect yet. The following two commits
    modified the code in perf_event_amd.c.

    34538ee77b39a12702e0f4c3ed9e8fa2dd5eb92c
    3f6da3905398826d85731247e7fbcf53400c18bd

    Will try reverting them to check if that helps.

    Thanks
    -Sachin


    --

    ---------------------------------
    Sachin Sant
    IBM Linux Technology Center
    India Systems and Technology Labs
    Bangalore, India
    ---------------------------------



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