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    SubjectRe: RCU hang on cpu re-hotplug with 2.6.27rc8
    > Could you please try the patch at the following URL (from Thomas
    > Gleixner)?
    > This fixed some CPU hotplug hangs that I was seeing in 2.6.27-rc7 and
    > -rc8. Alternatively, try 2.6.27-rc9, which seems to include Thomas's
    > patch.

    Still happens with rc9. This time with frame pointers:

    bash D 00000000ffff975e 0 4770 4757
    ffff8804bcda3bf8 0000000000000082 ffff8804bcda3c18 0000000000000296
    ffff8804bde4e6b0 ffff8804be6fc630 ffff8804bde4e8f8 0000000e00000296
    ffff8804bcda3c18 ffffffff808cfd98 ffff880288064780 ffff88027d18ec98
    Call Trace:
    [<ffffffff805c4915>] schedule_timeout+0x22/0xb4
    [<ffffffff8020a009>] ? __switch_to+0x320/0x330
    [<ffffffff802602ed>] ? cpupri_set+0xc5/0xd8
    [<ffffffff805c476f>] wait_for_common+0xcd/0x131
    [<ffffffff8022db87>] ? default_wake_function+0x0/0xf
    [<ffffffff805c485d>] wait_for_completion+0x18/0x1a
    [<ffffffff80243fbf>] synchronize_rcu+0x35/0x3c
    [<ffffffff8024403e>] ? wakeme_after_rcu+0x0/0x12
    [<ffffffff8022ed25>] partition_sched_domains+0x9b/0x1dd
    [<ffffffff8022dbb3>] ? wake_up_process+0x10/0x12
    [<ffffffff8022ee95>] update_sched_domains+0x2e/0x35
    [<ffffffff805c8342>] notifier_call_chain+0x33/0x5b
    [<ffffffff80249291>] __raw_notifier_call_chain+0x9/0xb
    [<ffffffff802492a2>] raw_notifier_call_chain+0xf/0x11
    [<ffffffff805c1c3a>] _cpu_up+0xd3/0x10c
    [<ffffffff805c1cca>] cpu_up+0x57/0x67
    [<ffffffff805a5787>] store_online+0x4d/0x75
    [<ffffffff803e67bb>] sysdev_store+0x1b/0x1d
    [<ffffffff802cce10>] sysfs_write_file+0xe0/0x11c
    [<ffffffff8028b661>] vfs_write+0xae/0x137
    [<ffffffff8028bb0a>] sys_write+0x47/0x6f
    [<ffffffff8020b34b>] system_call_fastpath+0x16/0x1b

    BTW it also happens reliably every time. Reproduced it three times
    now. I just do

    laut:~ # echo 0 > /sys/devices/system/cpu/cpu15/online
    laut:~ # echo 0 > /sys/devices/system/cpu/cpu14/online
    laut:~ # echo 1 > /sys/devices/system/cpu/cpu14/online
    laut:~ # echo 1 > /sys/devices/system/cpu/cpu15/online


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