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    Subject[Bug 2219] New: kernel BUG at mm/rmap.c:306
    http://bugme.osdl.org/show_bug.cgi?id=2219

    Summary: kernel BUG at mm/rmap.c:306
    Kernel Version: 2.6.3
    Status: NEW
    Severity: high
    Owner: akpm@digeo.com
    Submitter: castetm@ensimag.imag.fr


    Distribution: gentoo
    Hardware Environment:pentium-3/512 Mo RAM

    I have try overcommit-accounting with strict overcommit, but when i launch a
    program like [1], there was a kernel bug [2]


    [1]
    int main()
    {
    while(fork() != -1) {}
    while(malloc(1024)) {}
    while(1) {}
    }
    ------------------------------------------------
    [2]
    Out of Memory: Killed process 8289 (a.out).
    Out of Memory: Killed process 8297 (a.out).
    swap_free: Bad swap offset entry 001c2790
    ------------[ cut here ]------------
    kernel BUG at mm/rmap.c:306!
    invalid operand: 0000 [#1]
    CPU: 0
    EIP: 0060:[<c014baf0>] Not tainted
    EFLAGS: 00010246
    EIP is at try_to_unmap_one+0x1e0/0x1f0
    eax: 00000000 ebx: 000c0000 ecx: 00000009 edx: c1000000
    esi: c14662e8 edi: df55e300 ebp: c14662e8 esp: dfa99d48
    ds: 007b es: 007b ss: 0068
    Process kswapd0 (pid: 8, threadinfo=dfa98000 task=dfa9eca0)
    Stack: df55e300 00000009 1c279005 00000000 00000000 00000004 c14662e8 da675ac0
    00000000 c014bbab d4a5d440 00000004 00000000 da675ac0 00000000 c14662e8
    00000001 dfa98000 c0142554 c1416c20 dfa99db8 c036a6f4 dfa98000 00000028
    Call Trace:
    [<c014bbab>] try_to_unmap+0xab/0x160
    [<c0142554>] shrink_list+0x224/0x560
    [<c0142a30>] shrink_cache+0x1a0/0x320
    [<c0143243>] shrink_zone+0x83/0xb0
    [<c014365a>] balance_pgdat+0x19a/0x220
    [<c01437f5>] kswapd+0x115/0x130
    [<c011d7e0>] autoremove_wake_function+0x0/0x50
    [<c0109302>] ret_from_fork+0x6/0x14
    [<c011d7e0>] autoremove_wake_function+0x0/0x50
    [<c01436e0>] kswapd+0x0/0x130
    [<c01072a5>] kernel_thread_helper+0x5/0x10

    Code: 0f 0b 32 01 13 c0 32 c0 e9 78 fe ff ff 8d 76 00 55 57 56 89
    <6>note: kswapd0[8] exited with preempt_count 2
    Out of Memory: Killed process 12353 (a.out).


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