Re: [uml-devel] Problems with UML on Debian Sarge 64 host

[Blaisorblade <blaisorblade@yahoo.it>]

On Friday 15 April 2005 06:56, Ian McDonald wrote:
> Comments inline
>
> On 15/04/05, Blaisorblade <blaisorblade@yahoo.it> wrote:
> > On Thursday 14 April 2005 06:25, Ian McDonald wrote:
> > > Hi there,

> > > The problem is that my bootup dies very early on and this is the total
> > > output: Checking for /proc/mm...not found
> > > Checking PROT_EXEC mmap in /tmp...OK
> > > tracing thread pid = 20981
> > > OP_FORK failed to attach pid

> > > I suspect that this is something to do with my mixed 32/64 bit
> > > environment but I am not sure... Can anybody shed some light on this?
> >
> > I've seen that *sometimes* too on 64-bit envs., tried doing a "setarch
> > i386 linux" or something like that, to force a 32-bit emulation?

> setarch isn't on this machine and I can't find the equivalent command for
> sarge.
Tried installing the needed package? On SUSE it's called "linux32".

Also, tried compiling UML itself on a real 32-bit box (with static linking, 
obviously)?

> > Tried disabling the ptrace proxy in compilation, as the first thing?

> Tried that and no difference. Note that 2.6.11.x with bs4 doesn't
> compile with this option showing unless you set FRAME_POINTER to n.
> You get an error such as:

> kernel/built-in.o(.text+0x83f4): In function `profile_tick':
> kernel/profile.c:387: undefined reference to `profile_pc'
Hmm, interesting... However, the more likely culprit is CONFIG_SMP:


include/asm-i386/ptrace.h

#if defined(CONFIG_SMP) && defined(CONFIG_FRAME_POINTER)
extern unsigned long profile_pc(struct pt_regs *regs);
#else
#define profile_pc(regs) instruction_pointer(regs)
#endif
instruction_pointer is defined, profile_pc is not.

> The only way I could find to set this option to n was hacking the
> autoconf.h file...
Disable CONFIG_DEBUG_INFO and FRAME_POINTER should become 'n'.

> So still no 32 bit UML... will try 64 bit (once I get access to the 64
> bit compiler) and see if I can get that to work....
Let me recall: you *did* succeed on your older fully-32bit Debian Woody 
system, right? Or did I leave something unfixed behind?

-- 
Paolo Giarrusso, aka Blaisorblade
Linux registered user n. 292729
http://www.user-mode-linux.org/~blaisorblade





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