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    SubjectRe: 2.6.16-rc5-git14 crash in spin_bug on ppc64
     On Fri, Mar 10, Olaf Hering wrote:

    >
    > I got this crash while hunting some other bug. dualcore 970mp.
    >
    > Welcome to SUSE Linux Enterprise Server 9.90 Beta7 (ppc) - Kernel 2.6.16-rc5-git
    > 14-ppc64-defconfig (console).
    >
    >
    > wels login: BUG: spinlock bad magic on CPU#1, gdm/4568
    > cpu 0x1: Vector: 300 (Data Access) at [c0000000f3c2f5c0]
    > pc: c00000000020a7ec: .spin_bug+0x94/0x100

    c0000000f40001f0 is *lock at 0xc0000000f217b738:
    1:mon> d c0000000f40001f0
    c0000000f40001f0 ffff000000000000 ffff000000000000 |................|
    c0000000f4000200 ffff000000000000 ffff000000000000 |................|
    c0000000f4000210 ffff000000000000 ffff000000000000 |................|
    c0000000f4000220 ffff000000000000 ffff000000000000 |................|



    anon_vma_link() *vma is
    1:mon> d c0000000f217b6b8 100
    c0000000f217b6b8 c0000000f4c51800 000000000f6e5000 |.............nP.|
    c0000000f217b6c8 000000000f6e9000 0000000000000000 |.....n..........|
    c0000000f217b6d8 0000000000000113 0000000000100073 |...............s|
    c0000000f217b6e8 c0000000f4edde78 0000000100000000 |.......x........|
    c0000000f217b6f8 c000000007960d18 c00000000ff799a8 |................|
    c0000000f217b708 c0000000f217cde8 c0000000f217cde8 |................|
    c0000000f217b718 0000000000000000 c0000000f4f644a8 |..............D.|
    c0000000f217b728 c0000000f4f64518 c0000000f4000208 |......E.........|
    c0000000f217b738 c0000000f40001f0 c000000000607600 |.............`v.|
    c0000000f217b748 000000000000007b c0000000f953fc80 |.......{.....S..|
    c0000000f217b758 0000000000000000 0000000000000000 |................|
    c0000000f217b768 c0000000f2186180 00000000f7fe1000 |......a.........|
    c0000000f217b778 00000000f7fff000 c0000000f9127088 |..............p.|
    c0000000f217b788 0000000000000117 0000000000000875 |...............u|
    c0000000f217b798 c00000000ff79d18 0000000000000000 |................|
    c0000000f217b7a8 0000000000000000 0000000000000000 |................|
    1:mon>

    The whole area looks broken:


    1:mon> d c0000000f4000000 400
    c0000000f4000000 ffff000000000000 ffff000000000000 |................|
    c0000000f4000010 ffff000000000000 ffff000000000000 |................|
    ...
    c0000000f4000260 ffff000000000000 ffff000000000000 |................|
    c0000000f4000270 ffff000000000000 ffff000000000000 |................|
    c0000000f4000280 c0000000f4000280 c0000000f4000280 |................|
    c0000000f4000290 00000000dead4ead ffffffff00000000 |......N.........|
    c0000000f40002a0 ffffffffffffffff c0000000f40002a8 |................|
    c0000000f40002b0 c0000000f40002a8 00000000dead4ead |..............N.|
    c0000000f40002c0 ffffffff00000000 ffffffffffffffff |................|
    c0000000f40002d0 c0000000f4f58a98 c0000000f4f58a98 |................|
    c0000000f40002e0 00000000dead4ead ffffffff00000000 |......N.........|
    c0000000f40002f0 ffffffffffffffff c0000000f21eaf68 |...............h|
    c0000000f4000300 c0000000f21eaf68 00000000dead4ead |.......h......N.|
    c0000000f4000310 ffffffff00000000 ffffffffffffffff |................|
    c0000000f4000320 c0000000f4000320 c0000000f4000320 |....... ....... |
    c0000000f4000330 00000000dead4ead ffffffff00000000 |......N.........|
    c0000000f4000340 ffffffffffffffff c0000000f4000348 |...............H|
    c0000000f4000350 c0000000f4000348 00000000dead4ead |.......H......N.|
    c0000000f4000360 ffffffff00000000 ffffffffffffffff |................|
    c0000000f4000370 c0000000f4000370 c0000000f4000370 |.......p.......p|
    c0000000f4000380 00000000dead4ead ffffffff00000000 |......N.........|
    c0000000f4000390 ffffffffffffffff c0000000f4442ca8 |.............D,.|
    c0000000f40003a0 c0000000f4efeb48 00000000dead4ead |.......H......N.|
    c0000000f40003b0 ffffffff00000000 ffffffffffffffff |................|
    c0000000f40003c0 c0000000f40003c0 c0000000f40003c0 |................|
    c0000000f40003d0 00000000dead4ead ffffffff00000000 |......N.........|
    c0000000f40003e0 ffffffffffffffff c00000000f335e08 |.............3^.|
    c0000000f40003f0 c00000000f3979e8 00000000dead4ead |.....9y.......N.|

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