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    Subjectoopsen with rc3-aa3
    Hi.

    The new code in rc3aa3 makes a dual Xeon box hang on boot just
    when stating migration threads. I get two simultaneous oops, one
    for migration_thread=1 and =2. Decoded oops for one of them:

    *pde = 00000000
    CPU: 1
    EIP: 0010:[<80119f9d>] Not tainted
    Using defaults from ksymoops -t elf32-i386 -a i386
    EFLAGS: 00010006
    eax: 00002700 ebx: 000000ff ecx: 00000004 edx: 00000000
    esi: 00000000 edi: 00000004 ebp: bffe7f80 esp: bffe7f40
    ds: 0018 es: 0018 ss: 0018
    Process migration_CPU1 (pid: 3, stackpage=bffe7000)
    Stack: 00000000 00000004 0000000a bffe7fc8 ffffffff 00000001
    bffe634b ffffffff 00000001 00000000 0000000a 00000001
    802fe240 00000000 bffe6000 802fe240 bffe7fc0 8011a7e7
    802fe240 00000001 802fe240 8025c116 bffe633e bffe6000
    Call Trace: [<8011a7e7>] [<8025c116>] [<8025c134>] [<8011c009>]
    [<80105000>] [<80105000>] [<80107256>] [<8011bec0>]
    Code: 8b 42 14 c7 42 14 01 00 00 00 85 c0 0f 85 88 03 00 00 8b 52

    >>EIP; 80119f9c <load_balance+ec/490> <=====
    Trace; 8011a7e6 <schedule+126/3a0>
    Trace; 8025c116 <vsprintf+16/20>
    Trace; 8025c134 <sprintf+14/20>
    Trace; 8011c008 <migration_thread+148/320>
    Trace; 80105000 <_stext+0/0>
    Trace; 80105000 <_stext+0/0>
    Trace; 80107256 <kernel_thread+26/30>
    Trace; 8011bec0 <migration_thread+0/320>
    Code; 80119f9c <load_balance+ec/490>
    00000000 <_EIP>:
    Code; 80119f9c <load_balance+ec/490> <=====
    0: 8b 42 14 mov 0x14(%edx),%eax <=====
    Code; 80119f9e <load_balance+ee/490>
    3: c7 42 14 01 00 00 00 movl $0x1,0x14(%edx)
    Code; 80119fa6 <load_balance+f6/490>
    a: 85 c0 test %eax,%eax
    Code; 80119fa8 <load_balance+f8/490>
    c: 0f 85 88 03 00 00 jne 39a <_EIP+0x39a> 8011a336 <load_balance+486/490>
    Code; 80119fae <load_balance+fe/490>
    12: 8b 52 00 mov 0x0(%edx),%edx

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