linux-kernel - Re: Latest git oopses during boot

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Message-ID: <8120cfd40802071424h5cf04861x63a88ea18508eda9@mail.gmail.com>
Date:	Thu, 7 Feb 2008 23:24:00 +0100
From:	"Harald Arnesen" <skogtun.linux@...il.com>
To:	"Linus Torvalds" <torvalds@...ux-foundation.org>
Cc:	"Harald Arnesen" <skogtun.harald@...il.com>,
	"FUJITA Tomonori" <tomof@....org>, akpm@...ux-foundation.org,
	matthew@....cx, linux-kernel@...r.kernel.org,
	linux-scsi@...r.kernel.org, fujita.tomonori@....ntt.co.jp
Subject: Re: Latest git oopses during boot

On 2/7/08, Linus Torvalds <torvalds@...ux-foundation.org> wrote:
>
>
> On Thu, 7 Feb 2008, Harald Arnesen wrote:
> >
> > I'll try applying the patch to a freshly downloaded git-tree.
>
> Ok, good.
>
> > Shall I try another compiler? I have at least these two:
> >
> > gcc version 3.4.6 (Ubuntu 3.4.6-6ubuntu2)
> > gcc version 4.1.3 20070929 (prerelease) (Ubuntu 4.1.2-16ubuntu2)
>
> I would suggest a patch mis-application problem first (or possibly even
> the patch itself being broken - I simply didn't look very closely at the
> patch, but it *looked* ok).
>
> If it's a compiler bug, it's a pretty big one, and quite frankly, I doubt
> it. Compiler bugs do happen, but they are pretty rare, and they tend to
> have more subtle effects than the one you see.
>
> However:
>
> > in addition to the self-compiled 4.2.3 I used for the tests.
>
> 4.2.3? Really? That's pretty damn recent, and so almost totally untested.
> That does make a compiler bug at least more likely.
>
> So yes, if you already have other compilers installed, you should try
> them. If it really is a compiler bug, it's a really bad one, and you would
> want to let the gcc people know.
>
> Still, I'd double-check that the
>
>         asc_dvc_varp->overrun_buf = kzalloc(ASC_OVERRUN_BSIZE, GFP_KERNEL);
>
> line was added properly first. You should see it way after the point where
> it did
>
>         asc_dvc_varp = &boardp->dvc_var.asc_dvc_var;
>
> to initialize it (and both statements should be inside a
>
>         if (ASC_NARROW_BOARD(boardp)) {
>
> conditional - please check that the source code looks sane too).
>
>                         Linus

I just re-downloaded an re-patched and re-compiled (with gcc 4.2.3),
and now the kernel boots. I must have screwed up the previous
patching.

It now works, with Fujita's patch applied.
-- 
Hilsen Harald
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