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    SubjectRe: 2.6.25-rc8-mm2: FIX kmalloc-2048 (was Re: 2.6.25-rc8-mm2: IP: [<ffffffff802868f9>] __kmalloc+0x69/0x110)
    On Mon, Apr 14, 2008 at 01:05:09PM -0700, Christoph Lameter wrote:
    > On Mon, 14 Apr 2008, Alexey Dobriyan wrote:
    >
    > > I can reproduce semi-reliably (by kernel standards) corruption in
    > > kmalloc-2048. No idea if this can explain all "struct file" related
    > > oopses I saw, or SLUB free pointer corruption Pekka and Christoph are
    > > looking into.
    >
    > The slub free pointer corruption is usually a result of the overwrites.
    >
    > > Bytes b4 0xffff81017ff9d2c0: 62 ea ff ff 00 00 00 00 5a 5a 5a 5a 5a 5a 5a 5a
    > > Object 0xffff81017ff9d2d0: 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b
    > > Object 0xffff81017ff9d2e0: 6b 6b 00 18 f3 a2 9f 90 00 1b 38 af 22 49 08 00
    > > Object 0xffff81017ff9d2f0: 45 10 00 4c ff 59 40 00 40 11 86 ac c0 a8 00 2a
    > > Object 0xffff81017ff9d300: 50 fa a2 be 91 43 00 7b 00 38 54 d4 23 00 00 00
    > > Object 0xffff81017ff9d310: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
    > > Object 0xffff81017ff9d320: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
    > > Object 0xffff81017ff9d330: 00 00 00 00 4c ff 10 44 74 7f 6f 9d e4 c8 a2 4f
    > > Object 0xffff81017ff9d340: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
    > > Redzone 0xffff81017ff9dad0: bb bb bb bb bb bb bb bb
    > > Padding 0xffff81017ff9db10: 5a 5a 5a 5a 5a 5a 5a 5a
    > >
    > > FIX kmalloc-2048: Restoring 0xffff81017ff9d2e2-0xffff81017ff9d8d9=0x6b
    >
    > Looks like skb corruption. Would be helpful to have the complete output
    > though. Does the data in the restored range trigger any memories?

    No.

    I'm currently tracing this bug and 2.6.24 also has it. :-(



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