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    SubjectRe: I just got got another Oops
    On Mon, 16 Mar 2009 11:55:09 +0900
    KAMEZAWA Hiroyuki <kamezawa.hiroyu@jp.fujitsu.com> wrote:

    > On Thu, 12 Mar 2009 14:31:49 -0400
    > Gene Heskett <gene.heskett@gmail.com> wrote:
    >
    > > Mar 12 14:15:02 coyote kernel: [ 2656.832669]
    > > Mar 12 14:15:02 coyote kernel: [ 2656.832672] Pid: 18877, comm: kmail Not tainted (2.6.29-rc7 #5) System Product Name
    > > Mar 12 14:15:02 coyote kernel: [ 2656.832675] EIP: 0060:[<c046520b>] EFLAGS: 00210202 CPU: 0
    > > Mar 12 14:15:02 coyote kernel: [ 2656.832678] EIP is at get_page_from_freelist+0x24b/0x4c0
    > > Mar 12 14:15:02 coyote kernel: [ 2656.832680] EAX: ffffffff EBX: 80004000 ECX: 00000001 EDX: 00000002
    > > Mar 12 14:15:02 coyote kernel: [ 2656.832682] ESI: c28fc260 EDI: 00000000 EBP: f2168d5c ESP: f2168cfc
    > > Mar 12 14:15:02 coyote kernel: [ 2656.832684] DS: 007b ES: 007b FS: 00d8 GS: 0033 SS: 0068
    > > Mar 12 14:15:02 coyote kernel: [ 2656.832686] Process kmail (pid: 18877, ti=f2168000 task=f22018b0 task.ti=f2168000)
    > > Mar 12 14:15:02 coyote kernel: [ 2656.832688] Stack:
    > > Mar 12 14:15:02 coyote kernel: [ 2656.832689] 00000002 00000044 c28fc060 00000000 f1463ca4 c0744b80 c06d6480 00000002
    > > Mar 12 14:15:02 coyote kernel: [ 2656.832693] 00000000 00000000 001201d2 00000002 00200246 00000001 c06d6900 00000100
    > > Mar 12 14:15:02 coyote kernel: [ 2656.832698] 00000000 80000000 c06d7484 c06d6480 c06d6480 c06d6480 f22018b0 00000129
    >
    > Added linux-mm to CC:
    >
    > 22a9: 8b 1e mov (%esi),%ebx #ebx=80004000 = page->flags
    > 22ab: 89 f2 mov %esi,%edx #remember "page"
    > 22ad: 8b 46 08 mov 0x8(%esi),%eax #esi+8=-1 page->mapcount
    > 22b0: 8b 7e 10 mov 0x10(%esi),%edi #esi+16=0 page->mapping
    > 22b3: f6 c7 40 test $0x40,%bh
    > 22b6: 74 03 je 22bb <get_page_from_freelist+0x24b>
    > 22b8: 8b 56 0c mov 0xc(%esi),%edx #page = page->first_page
    > 22bb: 8b 4a 04 mov 0x4(%edx),%ecx #page->_count
    >
    > Thank you for disassemble list, from above....
    >
    > In prep_new_page()
    > 610 static int prep_new_page(struct page *page, int order, gfp_t gfp_flags)
    > 611 {
    > 612 if (unlikely(page_mapcount(page) |
    > 613 (page->mapping != NULL) |
    > 614 (page_count(page) != 0) |
    > 615 (page->flags & PAGE_FLAGS_CHECK_AT_PREP)))
    > 616 bad_page(page);
    >
    > page->mapping = NULL, (VALID)
    > page->mapcount = -1 (VALID)
    > page->count ==> NULL access because PageTail() is set, see below.
    > (Note: from .config, CONFIG_PAGEFLAGS_EXTENDED is set.)
    >
    > ==
    > 288 static inline int page_count(struct page *page)
    > 289 {
    > 290 return atomic_read(&compound_head(page)->_count);
    > 291 }
    >
    > 281 static inline struct page *compound_head(struct page *page)
    > 282 {
    > 283 if (unlikely(PageTail(page)))
    > 284 return page->first_page;
    > 285 return page;
    > 286 }
    > ==
    >
    > PageTail() is true (this is invalid) and page->first_page contains obsolete data.
    > But, here, PG_tail should not be there...
    >

    Gene-san, could you set CONFIG_DEBUG_VM (and other debug option ?)
    I think it can give us another view.

    -Kame





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