On Tue, 16 Mar 2010, Michael Tokarev <m...@tls.msk.ru> wrote:
> > When the path specified by -mem-path isn't writable the error message
> > "mkstemp: Permission denied" is displayed on stderr - which means that it
> > can't be seen until after the kvm session is ended when using the -curses
> > option.
>
> Russell, it's the same thing as #574063 again.  If you redirected stderr
> to /dev/null, please don't complain that you see no useful error message.

But when an application redirects it's own output to /dev/null it's something 
that needs to be fixed - I've filed Debian bug reports about that before.

> With -curses the current terminal is used for entirely different purpose
> (guest output), and if you at the same time want to see stderr, redirect
> it to a file or a pipe, or use some management software.

Or kvm could use syslog or some other mechanism for logging such things.

> Generally, and it applies to #574063 too, kvm lacks control over "failure
> reaction": here when it is unable to allocate hugepages, and in #574063,
> when it can't initialize /dev/kvm, and in some other cases, it currently
> continues, but sometimes it is useful to stop here with error.  There is
> no way currently to tell kvm to turn such "warning" messages into fatal
> errors.

The lack of a way to turn warnings into fatal errors is a bug.  Think 
of -Werror for C compilation.

> By the way, 0-72 version as shipped in Lenny is a joke nowadays.  It is
> not a bad development snapshot, but it is still a development snapshot,
> just like all other kvm-NN "releases" were.  If you intend to play or
> even use kvm, grab it from backports (it's called qemu-kvm there) - this
> version is a bit closer to released software than kvm-72 in lenny.  I for
> one will not try to support it in any way, unless the same problem exists
> in qemu-kvm-0.12.

http://bugs.debian.org/cgi-bin/bugreport.cgi?bug=574060

My first attempt at reporting such bugs involved reproducing some of them on 
Unstable, but unfortunately they got lost (see the above reportbug bug).




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