Re: [uml-devel] 2.4.22-[67] problems

[Matt Zimmerman <mdz@debian.org>]

On Sat, Dec 20, 2003 at 12:14:50PM -0500, Jeff Dike wrote:

> On Fri, Dec 19, 2003 at 05:13:23PM -0800, Matt Zimmerman wrote:
> > There definitely seems to be something awry here, even in skas mode.  I am
> > getting a lot of ENOSYS errors inside UML:
> > 
> > /usr/lib/apt/methods/http: error while loading shared libraries: libc.so.6: cannot map zero-fill pages: Error 38
> > 
> > dpkg: error processing /var/cache/apt/archives/debhelper_4.0.2_all.deb (--unpack):
> >  failed to rmdir/unlink `/usr/share/man/man1/dh_compress.1.gz.dpkg-tmp': Function not implemented
> > 
> > basename: write error: Function not implemented
> > 
> > etc.
> > 
> > Downgrading to user-mode-linux 2.4.22-6um-1 still has the problem,
> > downgrading further to 2.4.22-5um-1 (the old binary) fixes it.  The
> > following things changed from 2.4.22-5um-1 to 2.4.22-6um-1, most of which
> > were outside of UML itself:
> 
> These changes look OK.  I looked through the -5 to -6 diffs and saw nothing
> that would cause stuff to start returning -ENOSYS.  The only thing that 
> seemed remotely relevant is the unistd.h change, which fixes a bug in the
> case of an error in an internally called system call.  You can try reverting 
> that and see what happens.
> 
> Beyond that, if you can find a system call that reproducably fails, then
> just step through it, and see where the -ENOSYS comes from.  This shouldn't
> be too difficult.

Thanks for looking at it.  It's sounding more and more like the new
glibc/linux-kernel-headers packages have broken UML.  Maybe something is
getting the host's kernel headers when it needs the ones from the UML build
tree?

-- 
 - mdz


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