On Wednesday 18 October 2006 20:04, Frank Marien wrote:
> I reported previously that a kernel build before a gcc/glibc update worked
> and stopped working after a rebuild with the new toolchain. This was a
> false conclusion. I misnamed a kernel. It was a 64-bit version which
> worked.
>
> So I'm stuck with this. I can build UML just fine (apart for the
> registers.c patches I need to apply) both with and without SUBARCH=i386,
> but the latter 32-bit binary won't run on my amd64.. Won't even produce an
> error. Nothing at all. Just sits there until I interrupt it.
Strace of it should be very helpful here, can you provide it? And please 
explicitly state whether SKAS or not on the host is used and such stuff.
> Must be 
> something about my system, since I don't see any such cases on this list at
> all. Always *some* output with the cases on the list.

> It would be nice if someone could either suggest a possible course of
> action, something I can test for you guys, where to start looking it you
> haven't the time,
I have 0 idea - apart verifying if you can run a binary 32-bit kernel, a 32bit 
static kernel compiled elsewhere.

> or some statement saying it's not supposed to work.. 

My test scenario is (almost) always make ARCH=um SUBARCH=i386 and run it on a 
64bit system (it happened that I ran such kernels on 32bit systems and I 
never found problems in this transition). I always take care to use skas0 for 
64bit guests or, for 32bit ones noprocmm or skas0 (both work, 1st is faster) 
if the host is a 64bit SKAS-patched one.

> (like IA32 emulation inside a UML).
This one is not expected to work now - it's a TODO feature since long time, 
but you'll already know we have other things before it on the list. (Just if 
you were asking, maybe not)
-- 
Inform me of my mistakes, so I can keep imitating Homer Simpson's "Doh!".
Paolo Giarrusso, aka Blaisorblade
http://www.user-mode-linux.org/~blaisorblade
Chiacchiera con i tuoi amici in tempo reale! 
 http://it.yahoo.com/mail_it/foot/*http://it.messenger.yahoo.com 


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