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References: <AANLkTin4FkGnRf=7q0fw30K6fWR1N+hTxFT+zdpbA0DN@mail.gmail.com>	<y0md3lksfzf.fsf@fche.csb>
Date: Tue, 22 Mar 2011 00:22:00 -0000
Message-ID: <AANLkTi=_nnZcCqvQCUXXzAj3CeT8S=ewy+4H3wUnBTk2@mail.gmail.com>
Subject: Re: different result on cross-compile on fc12 and fc13
From: Zhiwei Ying <zhiwei.ying@gmail.com>
To: "Frank Ch. Eigler" <fche@redhat.com>
Cc: systemtap <systemtap@sources.redhat.com>
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Actually I am using staprun 1.4 on the board, and compiled same
version on the host. I am moving to Ubuntu to see if there is any
lucky.

On Mon, Mar 21, 2011 at 10:30 PM, Frank Ch. Eigler <fche@redhat.com> wrote:
> Zhiwei Ying <zhiwei.ying@gmail.com> writes:
>
>> [...] =A0If I compiled the trace.ko on fc13, then everything is
>> fine. The trace log is generated correctly. But if I compiled the
>> trace.ko on fc12, whatever I use the stap on fc12 or compile a
>> systemtap 1.4 myself, I cannot see correct trace log on the board
>> after running. [...]
>
> One possibility is a mismatch between the version of stap on the host,
> and the version of staprun installed on the board. =A0There was a
> module<->staprun interface change in commit #3abb860f (in stap 1.4)
> that was unfortunately not done in a cross-compatible manner. =A0You'd
> see target kernel error (dmesg) messages of the form
>
> =A0 =A0STP_RELOCATE message size mismatch (%lu vs %lu)
>
> If you upgrade your staprun on the target, and your development stap,
> it should work again. =A0We could change the next version of stap to
> have its modules tolerate much older stapruns, if that's important.
>
> - FChE
>