[uml-devel] Hi people. A kernel bug in the vanilla kernel

[uml-devel] Hi people. A kernel bug in the vanilla kernel

[stian]

I'm currently on a small vaccation so I'm quite limited in Internett
connection and alike. I come across a kernel-bug in 2.4.x and 2.6.x
kernels and wondered if the same problemes occures inside UML. Could
somebody just take a small peek?


http://marc.theaimsgroup.com/?l=linux-kernel&m=108681568931323&w=2
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=15905


Simple compile the small program that is in the report on the gcc bugzilla
system and run it inside UML and see if runs or freezes the UML.



Stian Skjelstad


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Re: [uml-devel] Hi people. A kernel bug in the vanilla kernel

[Ali Almahdi]

I have tested this on one of my umls (Linux version 2.6.4-1um), It 
didn't crash..
Here is the output I got..
--------------- Output -------------------
#./a.out
.................................................*..............
.................................................................
.................................................................
.................................................................
.....Floating point exception

----------- Output ends here ----------------

stian@nixia.no wrote:

>I'm currently on a small vaccation so I'm quite limited in Internett
>connection and alike. I come across a kernel-bug in 2.4.x and 2.6.x
>kernels and wondered if the same problemes occures inside UML. Could
>somebody just take a small peek?
>
>
>http://marc.theaimsgroup.com/?l=linux-kernel&m=108681568931323&w=2
>http://gcc.gnu.org/bugzilla/show_bug.cgi?id=15905
>
>
>Simple compile the small program that is in the report on the gcc bugzilla
>system and run it inside UML and see if runs or freezes the UML.
>
>
>
>Stian Skjelstad
>
>
>-------------------------------------------------------
>This SF.Net email is sponsored by the new InstallShield X.
>>From Windows to Linux, servers to mobile, InstallShield X is the
>one installation-authoring solution that does it all. Learn more and
>evaluate today! http://www.installshield.com/Dev2Dev/0504
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>  
>



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Re: [uml-devel] Hi people. A kernel bug in the vanilla kernel

[Vincent Guffens]

I've just tried it in linux-2.4.24-um1 and it does not freeze anything. 
The program prints dots and stars here and there.

uml:~# uname -a
Linux uml 2.4.24-1um #46 Thu May 6 13:54:24 GMT 2004 i686 unknown

uml:~# /mnt/home/vinsz/tmp/bug
...................................................................
...................................................................
...................................................................
...................................................................
...................................................................
...............*...................................................
...................................................................
...................................................................
...................................................................
...................................................................
...................................................................
...................................................................
...................................................................
...................................................................
...................................................................
...................................................................
...................................................................
..................................................*................
...........................................*.......................
...................................................................
....................

stian@nixia.no wrote:
> I'm currently on a small vaccation so I'm quite limited in Internett
> connection and alike. I come across a kernel-bug in 2.4.x and 2.6.x
> kernels and wondered if the same problemes occures inside UML. Could
> somebody just take a small peek?
> 
> 
> http://marc.theaimsgroup.com/?l=linux-kernel&m=108681568931323&w=2
> http://gcc.gnu.org/bugzilla/show_bug.cgi?id=15905
> 
> 
> Simple compile the small program that is in the report on the gcc bugzilla
> system and run it inside UML and see if runs or freezes the UML.
> 
> 
> 
> Stian Skjelstad
> 
> 
> -------------------------------------------------------
> This SF.Net email is sponsored by the new InstallShield X.
>>From Windows to Linux, servers to mobile, InstallShield X is the
> one installation-authoring solution that does it all. Learn more and
> evaluate today! http://www.installshield.com/Dev2Dev/0504
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> User-mode-linux-devel mailing list
> User-mode-linux-devel@lists.sourceforge.net
> https://lists.sourceforge.net/lists/listinfo/user-mode-linux-devel
> 



-- 
				Vincent Guffens
				PhD Student UCL/CESAME
				tel:   +32 10 47 80 30
Value your freedom, or you will lose it, teaches history.
"Don't bother us with politics," respond those who don't want to learn.
	      	-- Richard M. Stallman



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Re: [uml-devel] Hi people. A kernel bug in the vanilla kernel

[stian]

Thanks people. If the world was perfect the code should run forever
without problems, but floating point exception is better than machine
freeze as happens outside UML on all machines tested except one by my
buddies.

Something is very wrong running that test, atleast when running on the
main host, and not inside UML. :-)


Stian


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Re: [uml-devel] Hi people. A kernel bug in the vanilla kernel

[BlaisorBlade]

Alle 14:06, venerdì 11 giugno 2004, stian@nixia.no ha scritto:
> Thanks people. If the world was perfect the code should run forever
> without problems, but floating point exception is better than machine
> freeze as happens outside UML on all machines tested except one by my
> buddies.
Well, about running without problems I disagree... the "floating point 
exception" is the correct behaviour: since with UML on 2.6 it reports so and 
on 2.4 there is no error message, we have a (little) bug, indeed, in Uml 2.4.

Links about why that is correct behaviour:
http://lwn.net/Articles/89002/

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



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