lkml.org 
[lkml]   [2007]   [Mar]   [19]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
    /
    Date
    From
    SubjectRe: 2.6.20.3: kernel BUG at mm/slab.c:597 try#2
    On 3/19/07, Andrew Morton <akpm@linux-foundation.org> wrote:
    > BUG_ON(!PageSlab(page));
    >
    > that's seriously screwed up. Do you have CONFIG_DEBUG_SLAB enabled? If
    > not, please enable it and retest.

    This is scary. Looking at disassembly of the OOPS:

    Disassembly of section .text:

    00000000 <.text>:
    0: 5f pop %edi
    1: c3 ret
    2: 57 push %edi
    3: 89 c1 mov %eax,%ecx
    5: 89 d7 mov %edx,%edi
    7: 8d 92 00 00 00 40 lea 0x40000000(%edx),%edx
    d: 56 push %esi
    e: c1 ea 0c shr $0xc,%edx
    11: 53 push %ebx
    12: c1 e2 05 shl $0x5,%edx
    15: 03 15 40 5d 5a c0 add 0xc05a5d40,%edx

    At this point, edx has the result of virt_to_page().

    1b: 8b 02 mov (%edx),%eax
    1d: f6 c4 40 test $0x40,%ah
    20: 74 03 je 0x25

    If it's a compound page, look up the real page from ->private.

    22: 8b 52 0c mov 0xc(%edx),%edx

    Now, reload page flags.

    25: 8b 02 mov (%edx),%eax

    And test...

    27: a8 80 test $0x80,%al
    29: 75 04 jne 0x2f
    2b: 0f 0b ud2a
    2d: eb fe jmp 0x2d
    2f: 39 4a 18 cmp %ecx,0x18(%edx)

    [snip, snip]

    EIP is at kmem_cache_free+0x29/0x5a
    eax: c1800000 ebx: f0ae12c0 ecx: c18f73c0 edx: c1800000
    esi: c1919de0 edi: 00000000 ebp: 00001000 esp: f1fe7e14
    ds: 007b es: 007b ss: 0068

    But somehow eax and edx have the same value 0xc1800000 here. Hmm?

    Pekka
    -
    To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
    the body of a message to majordomo@vger.kernel.org
    More majordomo info at http://vger.kernel.org/majordomo-info.html
    Please read the FAQ at http://www.tux.org/lkml/

    \
     
     \ /
      Last update: 2007-03-19 09:03    [W:3.636 / U:0.660 seconds]
    ©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site