Re: [uml-devel] SIGSEGV and SA_NODEFER

[Rob Landley <rob@landley.net>]

On Tuesday 25 January 2005 05:16 am, Blaisorblade wrote:
> > > > I'm using stdin/stdout as the console.  (And even though you put it
> > > > into raw mode, I still can't ctrl-c out of the processs I'm running,
> > > > either.)
> >
> > Hmm, ^C works perfectly fine for me.  Usually I work with a virtual
> > serial line as console ("console=ttyS0 ssl0=fd:0,fd:1 con=pts"), works
> > better than the uml console as applications don't expect the linux vt
> > ioctls work on these devices ;)
>
> About this, Rob: do you use /dev/console in the inittab line? If you do,
> then that's the problem - it should become a FAQ somewhere I guess.

I'm not using init, I'm running my script as init.  So I'd guess it's 
using /dev/console, yes.

I know that /dev/console is funky.  That's why I want the option to let ctrl-c 
kill the whole vmlinux instance.  (Possibly as a command line option.)  I'll 
look into that later...

> > I'm still at 2.6.10 + patches though, not yet at 2.6.11-rc2.
> >
> > > However, I'm not sure that patch is at fault... there is a locking
> > > problem which *could* maybe be responsible of this...; I actually
> > > wonder about why this locking problem has never shown up in reports or
> > > in testing (it exists, only it's a race condition)... there is a
> > > situation where it shows up with a side effect, indeed, so the problem
> > > exists...
> >
> > Heavy swapping (see other mail) and thus some stuff running _very_ slow
> > might open such race windows wide enougth that one actually hits them.
>
> Yes, my only doubt was that he seemed to mean that the guest was swapping,
> and *this* different situation would have the opposite effect, probably.

Host is swapping, client configured without even support for swap.  (If I can 
get the darn client vmlinux down to 1 megabyte, I'd be thrilled.  Didn't 
somebody once make the entire block layer configurable out once?  With 
hostfs, I don't need it...)

Rob


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