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Running the counters testcase from libhugetlbfs results in on 2.6.25-rc5
and 2.6.25-rc5-mm1:

    BUG: soft lockup - CPU#3 stuck for 61s! [counters:10531]
    NIP: c0000000000d1f3c LR: c0000000000d1f2c CTR: c0000000001b5088
    REGS: c000005db12cb360 TRAP: 0901   Not tainted  (2.6.25-rc5-autokern1)
    MSR: 8000000000009032 <EE,ME,IR,DR>  CR: 48008448  XER: 20000000
    TASK = c000005dbf3d6000[10531] 'counters' THREAD: c000005db12c8000 CPU: 3
    GPR00: 0000000000000004 c000005db12cb5e0 c000000000879228 0000000000000004
    GPR04: 0000000000000010 0000000000000000 0000000000200200 0000000000100100
    GPR08: c0000000008aba10 000000000000ffff 0000000000000004 0000000000000000
    GPR12: 0000000028000442 c000000000770080
    NIP [c0000000000d1f3c] .return_unused_surplus_pages+0x84/0x18c
    LR [c0000000000d1f2c] .return_unused_surplus_pages+0x74/0x18c
    Call Trace:
    [c000005db12cb5e0] [c000005db12cb670] 0xc000005db12cb670 (unreliable)...