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    SubjectRe: [discuss] 2.6.19-rc6: known regressions (v4)
    On Wed, Nov 22, 2006 at 05:05:49PM +0100, Andre Noll wrote:
    > Unfortunately, yes. I tried rc6, current git, and currrent git + David
    > Rientjes' patch. They all show the same behaviour.

    I must have missed that patch.
    >
    > > It's probably another bug in the memmap parsing rewrite (Mel cc'ed)
    > > but the debugging information in the standard kernel unfortunately
    > > doesn't give enough output to find out where it happens.
    >
    > Feel free to send me a debugging patch..

    Here's one. Please send output (unless Mel finds the problem first..)

    -Andi

    Index: linux-2.6.19-rc6-hack/mm/page_alloc.c
    ===================================================================
    --- linux-2.6.19-rc6-hack/mm/page_alloc.c
    +++ linux-2.6.19-rc6-hack/mm/page_alloc.c
    @@ -188,6 +188,10 @@ static inline int bad_range(struct zone

    static void bad_page(struct page *page)
    {
    + static int warned;
    + if (!warned) {
    + warned = 1;
    + printk(KERN_EMERG "page address %lx\n", page_address(page));
    printk(KERN_EMERG "Bad page state in process '%s'\n"
    KERN_EMERG "page:%p flags:0x%0*lx mapping:%p mapcount:%d count:%d\n"
    KERN_EMERG "Trying to fix it up, but a reboot is needed\n"
    @@ -196,6 +200,7 @@ static void bad_page(struct page *page)
    (unsigned long)page->flags, page->mapping,
    page_mapcount(page), page_count(page));
    dump_stack();
    + }
    page->flags &= ~(1 << PG_lru |
    1 << PG_private |
    1 << PG_locked |
    -
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