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Re: kern/53590: DTrace fbt_getargdesc() fails with "Unknown function"
The following reply was made to PR kern/53590; it has been noted by GNATS.
From: Andreas Gustafsson <gson%gson.org@localhost>
To: martin%NetBSD.org@localhost, gnats-bugs%NetBSD.org@localhost
Cc: christos%NetBSD.org@localhost, prlw1%cam.ac.uk@localhost, chuq%chuq.com@localhost
Subject: Re: kern/53590: DTrace fbt_getargdesc() fails with "Unknown function"
Date: Wed, 31 Jul 2019 13:32:48 +0300
Last year, I wrote:
> Looks like something in the release build is overriding the
> makeoptions DEBUG="-g" in GENERIC.
I found that "something". /etc/Makefile contains "-U DEBUG", which
was added in the following commit by martin:
date: 2014-05-05 22:10:00 +0300; author: martin; state: Exp; lines: +2 -2; commitid: TIGgqdYim0L6Nnzx;
Use the new -U option for config to avoid generating kernel debug info
during release builds. This should save quite some space in the evbarm
build, where makeoptions DEBUG is heavily used.
Martin, could you please revert this? I see three reasons to do so:
- To fix this PR. This is a necessary step towards making tracing of
function arguments and return types work in DTrace, but sadly not
sufficient; there's still the CTF type table overflow issue
- It is really confusing that the GENERIC kernels produced by
"build.sh release" and "build.sh kernel=GENERIC" are not equivalent
(to the point that when I raised this question in the PR, no one
could explain why)
- It is a necessary step towards get kernel debug symbols included in
releases as discussed in PR 50128.
Andreas Gustafsson, gson%gson.org@localhost
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