Re: [uml-devel] UML/64bit is miscompiled by gcc 4.0.3 on Ubuntu 6.06 LTS

[Blaisorblade <blaisorblade@yahoo.it>]

On Wednesday 17 January 2007 19:15, Antoine Martin wrote:
> >> ptrace(PTRACE_SETREGS, 31586, 0, 0x6096dac8) = 0
> >> ptrace(PTRACE_SETFPREGS, 31586, 0, 0x6096dba0) = 0
> >> ptrace(PTRACE_SYSCALL, 31586, 0, SIG_0) = 0
> >>
> >> I'll have to verify whether some code in the stubs is miscompiled. But
> >> not until... well, I dunno when I'll be back...
> >>
> >> Anybody else with the same problem?
> >
> > Isn't this is the same problem we discussed a few months back?  What
> > I've discovered since then is this is a regression introduced after
> > 2.6.16 on the _host_.  Any post-2.6.16 host kernel, either skas v8.2 or
> > v9.pre causes Ubuntu (and other distros, I believe) to hang after "VFS
> > mounting root".

> > http://marc.theaimsgroup.com/?l=user-mode-linux-devel&m=116008558424368&w
> >=2
> > http://marc.theaimsgroup.com/?l=user-mode-linux-devel&m=116711159414443&w
> >=2
>
> Indeed it is.
>
> A fix would be more than welcome. (2.6.16 is a bit dated)
> I believe a lot of users are hitting this bug now too (and it is a
> regression) as a lot of distros ship recent kernels.

> Another regression in 2.6.16 (or later?) is the inability to run 32-bit
> guests on 64-bit hosts (the same binaries that used to work before -
> statically compiled). The boot stops very early during the "checking
> ptrace" step.

Just fixed such a regression in 2.6.18 - patch is 'x86_64: fix 2.6.18 
regression - PTRACE_OLDSETOPTIONS should be accepted'. Actually, Jeff 
discovered the same bug today, like me! Please test it to make sure there are 
no further bugs.

For the other bug, could you, Antoine and Christopher, open an entry in 
bugzilla? Going through emails is becoming confusing...

Bye
-- 
Inform me of my mistakes, so I can add them to my list!
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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