Re: [uml-devel] Please test 2.6.13-rc2 in TT mode! Big problem with syscall parameters clobbering

[Blaisorblade <blaisorblade@yahoo.it>]

On Thursday 07 July 2005 20:31, Blaisorblade wrote:
> For this kernel (and for -rc1), I've been getting almost no reports (except
> a problem with GCC 2.95 I now solved) in TT mode, so I'd like some more
> testing, especially for users which have the latest SKAS patch installed.
> At least positive / negative reports.

[...]
> But on my system the comparison fails, because the compiler keeps "to"
> inside EBX and after the syscall return the content of EBX is altered!

> So, this seems a kernel bug, but it does not happen in the previous form of
> the code (which didn't use a direct syscall but rather the glibc version)!

> And my system works pretty well, I think;
>
> * I get only some crashes from some KDE components, but I consider them
> normal,
> * and a lot of problems with GDB and debugging (still looking for the
> cause).

Ok, I found the problem, it was due indeed to a SKAS3 bug. I could verify it 
in patch releases as old as 2.6.9-v7 by testing, and I didn't went testing 
further back. In all kernels I tested, CONFIG_REGPARM was enabled, and this 
is related with the problem.

The solution is to upgrade to -V8.2.
-- 
Inform me of my mistakes, so I can keep imitating Homer Simpson's "Doh!".
Paolo Giarrusso, aka Blaisorblade (Skype ID "PaoloGiarrusso", ICQ 215621894)
http://www.user-mode-linux.org/~blaisorblade


	

	
		
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