current.stp killed the machine

[Wenji Huang]

Hi,

    I ran "make installcheck" using the latest source code of systemtap, 
found that the kernel panic.

    Related information:
   
    kernel BUG at arch/i386/kernel/kprobes.c:452!
    invalid opcode: 0000 [#1]
    Call Trace:
    kretprobes_trampoline+
    .........

    Environment:
      VM - i386
      2.6.21

Regards,
Wenji
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