Re: [patch] Re: [uml-devel] Kallsyms on UML

[BlaisorBlade <blaisorblade_spam@yahoo.it>]

Alle 16:40, lunedì 26 luglio 2004, Mulyadi Santosa ha scritto:
> hello
>
> > Yes, exactly. (It is not matter of EXPORT_SYMBOL, you're right).
>
> Thanks for correcting me :-)

> BTW, why vmlinux might miss the stack trace? is it just because it missed
> kallsysms?
The 2 patches handle the two problems:
1) Kallsyms didn't work (the .tmp_kallsyms were empty because 
arch/um/kernel/vmlinux.lds.S did not set _stext and _sinittext, which are 
used by the kallsyms tool)

2) The UML dump_stack() version didn't use the kallsyms facilities.

> > However, on any 2.6 UML, run cat /dev/kmem (which will panic, the fix is
> > known but yet to submit) and say if you can get the stacktrace. For some
> > reason, I cannot (even if dump_stack() is invoked); nothing is printed.
> > Seems like the printk() are lost (maybe some tricks with bust_spinlock()
> > are needed).
>
> BTW, interesting to read tricks to beat lost printk, Paolo....can you share
> your trick to defeat it? Just using bust_spinlock? or....just crazy
> idea...force console/tty flush?
Well, in the patch I tried to use bust_spinlock(), but it didn't work. I have 
just a raw idea of what it does, but I followed the panic() code. It could 
even be a console/tty flush, maybe, but I don't know to what those words 
translate. Or maybe even moving machine_halt() to later, somehow (which is 
called by the UML function panic_exit(), grep for it).

-- 
Paolo Giarrusso, aka Blaisorblade
Linux registered user n. 292729



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