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    SubjectRe: Oops on 2.5.40, flush_tlb_mm
    Zwane Mwaikambo wrote:
    >
    > Hi,
    > Please keep my CC on any replies (i'm currently experiencing
    > DNS problems and hence do not get lkml)
    >
    > Dorking around in mozilla did this, the machine had completely locked up
    > so this was from the serial;
    >
    > Unable to handle kernel paging request at virtual address 5a5a5ad6
    > printing eip:
    > c0115f2f
    > *pde = 00000000
    > Oops: 0000
    >
    > CPU: 0
    > EIP: 0060:[<c0115f2f>] Not tainted
    > EFLAGS: 00010202
    > EIP is at flush_tlb_mm+0x1f/0x90
    > eax: c1ce01a0 ebx: 5a5a5a5a ecx: 00000000 edx: fffffffe
    > esi: 00400000 edi: c759d418 ebp: 00100000 esp: c2749f04
    > ds: 0068 es: 0068 ss: 0068
    > Process mozilla-bin (pid: 1396, threadinfo=c2748000 task=c1ce01a0)
    > Stack: c759d418 c01418ab 5a5a5a5a c759d418 c142d810 c0141a1a c142d810 c195263c
    > c012c577 00000001 00000000 c1ce01a0 41500000 00100073 00000002 c195263c
    > c0141c62 c195263c 41800000 41500000 00000025 00000025 c2fda834 00000073
    > Call Trace:
    > [<c01418ab>]change_protection+0x1bb/0x210
    > [<c0141a1a>]mprotect_attempt_merge+0x11a/0x1d0
    > [<c012c577>]update_process_times+0x27/0x30
    > [<c0141c62>]mprotect_fixup+0x192/0x1b0
    > [<c0141de7>]sys_mprotect+0x167/0x2f0
    > [<c010bd67>]do_IRQ+0x1e7/0x200
    > [<c0109477>]syscall_call+0x7/0xb

    You need Hugh's patch. Was sent to Linus yesterday...



    Patch from Hugh Dickins

    Our earlier fix for mprotect_fixup was broken - passing an
    already-freed VMA to change_protection().



    mm/mprotect.c | 4 +++-
    1 files changed, 3 insertions(+), 1 deletion(-)

    --- 2.5.40/mm/mprotect.c~hugh-mprotect-fix Tue Oct 1 23:43:14 2002
    +++ 2.5.40-akpm/mm/mprotect.c Tue Oct 1 23:43:14 2002
    @@ -186,8 +186,10 @@ mprotect_fixup(struct vm_area_struct *vm
    /*
    * Try to merge with the previous vma.
    */
    - if (mprotect_attempt_merge(vma, *pprev, end, newflags))
    + if (mprotect_attempt_merge(vma, *pprev, end, newflags)) {
    + vma = *pprev;
    goto success;
    + }
    } else {
    error = split_vma(mm, vma, start, 1);
    if (error)
    .
    -
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