Re: [uml-devel] Default kernel configuration on 2.6.x

[BlaisorBlade <blaisorblade_spam@yahoo.it>]

On Tuesday 12 October 2004 02:41, Julian Scheid wrote:
> BlaisorBlade wrote:
> > On Tuesday 12 October 2004 00:22, Julian Scheid wrote:
> >>This is especially fatal because without a virtual character device
> >>driver, stdio initialization will fail silently or with an unhelpful
> >>error message ("sleeping process got unexpected signal 11"), leaving
> >>unsuspecting users like me completely puzzled.
> >
> > I.e. that error comes from this?????? Thanks a lot for this solution, but
> > could you explain which is exactly the wrong CONFIG_ option set for this
> > to happen?

> No, not exactly, but I believe it's the file descriptor channel support.

> Long answer: when I encountered this problem ("signal 11") and realized
> that my kernel config could be missing something I found that without
> exception, all UML-specific options were disabled (for the reasons
> mentioned).
>
> I proceeded to enable most of them (except the watchdog and some virtual
> network drivers which sounded arcane) and the problem went away.

> So I don't know exactly which option was necessary to get around the
> SEGV, but since it always happened around the stdio initialization and I
> was using "con=pty con0=fd:0,fd:1" I would say the culprit was the
> missing file descriptor channel support and/or pty channel support.

> If you can't reproduce it like this, let me know and I will try to nail
> it down.

Thanks a lot for this analysis, I'll check it here and let you know.

> > [Please always avoid sending that kind of patches; you **MUST ALWAYS**
> > use unified diffs, i.e. diff -u; the preferred setting is -puNr].
>
> I noticed that too just a minute ago, very newbie-ish. Pardon, I'm not
> submitting patches too often, I'll take more care next time.

> But hey, that's no reason to shout at me, I'm just trying to be helpful ;)

Oh, sorry. Yes, I was maybe a bit rude, and it was not my intention - however 
what I try to do is to correct issues like these to avoid people being flamed 
somewhere where people are less polite. Here we are nice - if you hit LKML, 
someone may flame you seriously, so I try helping. In fact I used CAPITAL 
just to make it clear, not to shout and flame you; again sorry for that.

> > About this, see the other responses - this must be done in mainline
> > whenever we are cross-compiling.
>
> Agree 100% with Michael and you, this is the right solution. I was
> focused on UML but in fact it's a larger issue.
Yeah - I should be sending this to Sam Ravnborg (Kbuild maintainer) when I 
have time to focus on this - now it's 3 a.m. and I think I'll be asleep 
shortly :-)

Bye
-- 
Paolo Giarrusso, aka Blaisorblade
Linux registered user n. 292729


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