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    Subject[BUG] 2.6.25-rc3-mm1 kernel bug while running libhugetlbfs
    Hi Andrew,

    kernel bug is triggered while running libhugetlbfs test with 2.6.25-rc3-mm1 kernel
    over the x86 and power machines.

    ------------[ cut here ]------------
    kernel BUG at mm/hugetlb.c:295!
    invalid opcode: 0000 [#1] SMP
    last sysfs file: /sys/devices/system/node/possible
    Modules linked in:
    Pid: 5484, comm: counters Not tainted (2.6.25-rc3-mm1-autokern1 #1)
    EIP: 0060:[<c10535cf>] EFLAGS: 00010202 CPU: 0
    EIP is at alloc_buddy_huge_page+0x7a/0xb0
    EAX: c13acd01 EBX: f7d3a000 ECX: 00000000 EDX: 00006363
    ESI: 00000001 EDI: 00000000 EBP: 00000000 ESP: f5539ebc
    DS: 007b ES: 007b FS: 00d8 GS: 0033 SS: 0068
    Process counters (pid: 5484, ti=f5538000 task=f60afa20 task.ti=f5538000)
    Stack: 00000001 c1053669 fffffff4 00000001 f5539ecc f5539ecc 00000001 fffffff4
    f55d0e78 00000001 c105480c 00000001 00200000 c1054875 00000000 f54426c0
    00200000 00000000 f54426c0 c10b0fb8 fffffff4 00200000 00000000 f55d0e78
    Call Trace:
    [<c1053669>] gather_surplus_pages+0x64/0x16d
    [<c105480c>] hugetlb_acct_memory+0x1e/0x4a
    [<c1054875>] hugetlb_reserve_pages+0x3d/0x6b
    [<c10b0fb8>] hugetlbfs_file_mmap+0x9b/0xe1
    [<c104bf9f>] mmap_region+0x1dc/0x3ae
    [<c104bd42>] do_mmap_pgoff+0x27f/0x28e
    [<c1005af2>] sys_mmap2+0x5a/0x78
    [<c10029fa>] syscall_call+0x7/0xb
    =======================
    Code: c1 e8 ed 27 1c 00 85 db 74 41 83 7b 04 00 75 10 68 c0 93 27 c1 e8 02 92 fc ff 58 e8 c1 02 fb ff f0 ff 4b 04 0f 94 c0 84 c0 74 04 <0f> 0b eb fe c7 43 38 3e 33 05 c1 8b 03 c1 e8 1c ff 04 85 60 ce
    EIP: [<c10535cf>] alloc_buddy_huge_page+0x7a/0xb0 SS:ESP 0068:f5539ebc
    ---[ end trace 5a47484f8fe93a33 ]---

    ------------[ cut here ]------------
    cpu 0x3: Vector: 700 (Program Check) at [c0000000fb277740]
    pc: c0000000000c6f54: .alloc_buddy_huge_page+0x120/0x1dc
    lr: c0000000000c6f20: .alloc_buddy_huge_page+0xec/0x1dc
    sp: c0000000fb2779c0
    msr: 8000000000029032
    current = 0xc0000000fc4cae90
    paca = 0xc0000000004fae80
    pid = 6828, comm = counters
    kernel BUG at mm/hugetlb.c:295!
    enter ? for help
    [c0000000fb277a50] c0000000000c70e8 .hugetlb_acct_memory+0xd8/0x374
    [c0000000fb277b10] c0000000000c769c .hugetlb_reserve_pages+0x184/0x2b0
    [c0000000fb277bc0] c00000000018c950 .hugetlbfs_file_mmap+0xec/0x160
    [c0000000fb277c70] c0000000000bc280 .mmap_region+0x254/0x4d4
    [c0000000fb277d80] c00000000000b1b8 .sys_mmap+0xa4/0x104
    [c0000000fb277e30] c00000000000872c syscall_exit+0x0/0x40
    --- Exception: c01 (System Call) at 000004000019e528
    SP (fffffcd4eb0) is in userspace
    3:mon>
    --
    Thanks & Regards,
    Kamalesh Babulal,
    Linux Technology Center,
    IBM, ISTL.

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