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    SubjectRe: shm bug introduced with pagecache in 2.3.11
    On 9 Nov 1999, Christoph Rohland wrote:

    > swap_duplicate
    > read_swap_cache_async
    > swapin_readahead
    > shm_nopage
    > handle_mm_fault
    > ...

    Hmm, are you sure you reproduced it in UP as you stated in the previous
    email? The above trace seems the effect of this SMP race condition:

    --- 2.3.26/mm/memory.c Sun Nov 7 17:33:38 1999
    +++ /tmp/memory.c Tue Nov 9 16:46:02 1999
    @@ -282,7 +282,9 @@
    free_page_and_swap_cache(mem_map+nr);
    return 1;
    }
    + lock_kernel();
    swap_free(pte_to_swp_entry(page));
    + unlock_kernel();
    return 0;
    }

    Andrea


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