Re: [PATCH] WTF is VLI?

[Andrew Morton]

Hugh Dickins <hugh@xxxxxxxxxxx> wrote:
>
> What is this "VLI" that 2.6.9 started putting after the taint string
> in i386 oopses?  Vick Library Index?  Vineyard Leadership Institute?
> Shall we just remove it?
> 

It's a magic kaos cookie:

  ksymoops handles up to 64 code bytes so dump eip-43:eip+20 with the eip
  byte enclosed in <>.  Add the string 'VLI ' (variable length
  instructions) just before the taint output, ksymoops 2.4.8 will look
  for 'VLI ' on the 'EIP:' line and split the code line into two chunks.

and

  The VLI indicator tells ksymoops the dump has variable length
  instructions so ksymoops splits the code into two lines at the eip byte. 
  Without the VLI indicator or using ksymoops < 2.4.9, ksymoops decodes the
  whole line in one go.  


I think the rationale is mainly so that new ksymoopses won't make a mess of
old oops records.

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