Re: [uml-devel] Am I doing something wrong with -skas0?

[Bodo Stroesser <bstroesser@fujitsu-siemens.com>]

Blaisorblade wrote:
> On Thursday 14 July 2005 22:30, Rob Landley wrote:
> 
>>On Thursday 14 July 2005 13:16, Rob Landley wrote:
>>
>>>Bodo's patch seems to have fixed the problem (albeit in a way that
>>>reveals ubuntu is using thread-local storage, so I can't use it anyway).
>>
>>Hang on a sec, if TLS is screwing up -skas0, then why does -tt mode work?
>>
>>Is this expected?
> 
> Hmm, I've seen TLS falling back on modify_ldt() at times, and it's surely a 
> bit bogus in current trees (although I have a partial fix for it, but not 
> sure whether it will work). Do you think init=/usr/bin/strace /bin/ls would 
> work? Uncomprehensible kernel params are passed to init, so it could.
Testing SKAS0 some month ago, I had problems with TLS in LDT, too. It didn't
print any message, but the processes looped on a segfault.
Debugging this, I changed SKAS0 to use the full faultinfo, so in the newer
versions it detects that the fault isn't fixable and generates SIGSEGV.
But I also had to add some code to make sys_modify_ldt work in SKAS0 (reading
and writing).

Most of this is in skas-hold-own-ldt, but further patches (e.g. skas0-clone)
might be necessary. The patches can be found in Jeff's incrementals.

	Bodo


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