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    SubjectRe: shm bug introduced with pagecache in 2.3.11
    On 8 Nov 1999, Christoph Rohland wrote:

    >Hi folks,
    >
    >I finally found the change, which gives me
    >
    >swap_duplicate: unused page

    You got also the EIP address of the caller, please resolved it it's very
    sensitive.

    Could you give a try removing this line:

    --- 2.3.26/ipc/shm.c Sun Nov 7 17:33:38 1999
    +++ /tmp/shm.c Tue Nov 9 12:16:28 1999
    @@ -790,7 +790,6 @@
    page = lookup_swap_cache(entry);
    if (!page) {
    lock_kernel();
    - swapin_readahead(entry);
    page = read_swap_cache(entry);
    unlock_kernel();
    if (!page)
    (note: the above is not the right fix for the kernel, it's just to verify
    that's the problem)

    Andrea


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