On Sat, Aug 05, 2006 at 10:07:01AM -0600, Eric W. Biederman wrote:
> Don Zickus <[email protected]> writes:
>
> >> The length error comes from lib/inflate.c
> >>
> >> I think it would be interesting to look at orig_len and bytes_out.
> >>
> >> My hunch is that I have tripped over a tool chain bug or a weird
> >> alignment issue.
> >
> > I thought so too, but I took vmlinuz images from people (Vivek) who had it
> > boot on their systems but those images still failed on my two machines.
> >
> >>
> >> The error is the uncompressed length does not math the stored length
> >> of the data before from before we compressed it. Now what is
> >> fascinating is that our crc's match (as that check is performed first).
> >>
> >> Something is very slightly off and I don't see what it is.
> >
> > I printed out orig_len -> 5910532 (which matches vmlinux.bin)
> > bytes_out -> 5910531
> >
> >>
> >> After looking at the state variables I would probably start looking
> >> at the uncompressed data to see if it really was decompressing
> >> properly. If nothing else that is the kind of process that would tend
> >> to spark a clue.
> >
> > I am not familiar with the code, so very few sparks are flying. I'll
> > still dig through though. Thanks for the tips.
>
> I guess the interesting thing to do would be to
> - Recompute the crc to see if we still match.
> - Possibly instrument of flush_window.
>
> I have a strange feeling that the uncompressed data is getting corrupted
> after we have flushed the window.
It seems to be an AMD64 vs EM64T problem. AMD chipsets work but Intel
chipsets don't.
I also blindly incremented bytes_out (as a really cheap hack), it didn't
work until I added some random putstr's below it (timing??). Then the
kernel booted.
Still looking into things.
Cheers,
Don
>
> Eric
>
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