Re: %openmosix and sata

Hi Gianluca

Thanks for your answer

I follow have the same problem ....

I try to explain the problem:

My script test.sh:
   for i in 1 2 3 4 5 ; do 
      awk 'BEGIN {for(i=0;i<10000;i++)for(j=0;j<10000;j++);}' &

   done

My cluster have 2 nodes, when i run above the script, the first time its ok,
but when i run it more times is when i get segmentation fault. Example:

openmosix-1 ~ # ./test.sh
openmosix-1 ~ # ./test.sh
Segmentation fault



I begin to read the kernel-hacking howto... and find it:

dmesg return an "Oops:0002" and "EIP:    0010:[<c01675b7>]", but I don't
find "Oops:0" and "EIP:  0010:[<c01675b7>]" in System.map... why ???? I
dont know

If you could help me, I try to modify your patch.



Maybe a solution for my problem is:

Install om for kernel 2.6; but it is not recomendable for production ...
what do you thing about it?


Thanks in advance

Sorry for my english


El mar, 04-07-2006 a las 10:07 +0200, Gianluca escribió:
> Dear Felipe,
> I know that there are some bugs in my kernel patch :-(
> but I'm not an expertise of kernel hacking... so I don't know how degub
> linux kernel and find where is the bug! :-(
> Months ago, I wrote on the mailing-list... saying that I've prepared
> this patch and I asked to community to help me in debugging and
> stabilizing my patch for 2.4.31 kernel...
> ... but I didn't get any help :-( :-(
> Seems that people using openmosix are not expertise of kernel
> debugging... and obviously the main developers don't spent time for
> debugging 2.4.x series :-(
> However, my cluster based on my patch runs from several months without
> stops!! :-) :-)
> For avoid the bug... don't run the mosrun command with the flag for
> migrate the job.
> For example, if you launch the command:
>  mosrun -4 heavyJob
> from a node different to 4... then you'll see the Segmentation Fault :-(
> So... if you never use that command... all things go well ;-) ... in
> fact, the automatic migration works well.
> 
> Ciao,
> Gianluca
> 
> Felipe ha scritto:
> > Thanks
> >
> > I try with it and the sata disk is ok, but when i probe the om with the
> > next script:
> >
> >   for i in 1 2 3 4 5 ; do 
> >      awk 'BEGIN {for(i=0;i<10000;i++)for(j=0;j<10000;j++);}' &
> >   done
> >
> >
> > When i run the script, its ok, but the next run display the next
> > message:
> >
> >         Segmentation fault
> >         
> > dmesg returns:
> >
> >         <1>Unable to handle kernel NULL pointer dereference at virtual
> >         address 0000001c
> >          printing eip:
> >         c01675b7
> >         *pde = 00000000
> >         Oops: 0002
> >         CPU:    0
> >         EIP:    0010:[<c01675b7>]    Not tainted
> >         EFLAGS: 00010286
> >         eax: 0000001c   ebx: f756c000   ecx: 00000000   edx: ffff0001
> >         esi: 080ed000   edi: 080e8000   ebp: f756dd34   esp: f756da34
> >         ds: 0018   es: 0018   ss: 0018
> >         Process test.sh (pid: 1705, stackpage=f756d000)
> >         Stack: f756da38 00000000 00000000 f59bf920 080e2000 c016c5ee
> >         080e7d74 080ec93c
> >                00005d74 00000003 00001812 0000009a f760a000 f762003c
> >         f6457b58 00000000
> >                00011e8c f6457bc0 00000001 060c0705 00000003 c02b5fac
> >         f6457b00 f756c000
> >         Call Trace:    [<c016c5ee>] [<c02b5fac>] [<c02af770>]
> >         [<c016c1c0>] [<c015136d>]
> >           [<c0150f6c>] [<c016a33f>] [<c01404eb>] [<c016a130>]
> >         [<c015136d>] [<c015153d>]
> >           [<c0105ba2>] [<c010a18f>] [<c01d5ffb>] [<c0105b60>]
> >         [<c01d4a97>] [<c01da988>]
> >           [<c010a06a>]
> >         
> >         Code: 0f c1 10 85 d2 0f 85 9a 15 00 00 89 3c 24 29 fe 89 74 24
> >         04
> >
> > My cluster have 2 nodes
> >
> > I compile the kernel with differents optios, but the result is the same.
> >
> > I have many questions, for example:
> >
> > om have support for my hardware?
> > Maybe the om conigurations is bad
> > My filesystem is Reiser 3.x .... is it the problem?
> > ?????
> >
> > any help is good for me 
> >
> > thanks in advance
> >
> >
> >
> >
> > El sáb, 01-07-2006 a las 09:54 +0200, Gianluca escribió:
> >   
> >> I have patched the 2.4.31 kernel... to resolving the same problem.
> >> attached you'll find my patch... you can try it ;-)
> >>
> >> Felipe ha scritto:
> >>     
> >>> I tried that also, but my pc's have the  I/O Controller Hub 7 and the
> >>> libata patch for kernel 2.4.26 doesnt have support for it.
> >>>
> >>> then which is the best versio of om for my pc's?
> >>>
> >>> Do you now how can i patch the kernel 2.4.26 with the newest libata
> >>> patch?
> >>>
> >>>
> >>>
> >>> El mié, 28-06-2006 a las 17:09 -0500, Brian English escribió:
> >>>   
> >>>       
> >>>> I have tried using the Gentoo Openmosix Kernels.  Try your best to
> >>>> avoidthese, especially the 2.4.30 one, as they are unstable at best.
> >>>> I would get segfaults while running the OpenMosixTest package as well
> >>>> as using the cluster to encode wav files to flac files. Your best bet
> >>>> is to manually install the latest stable version from the site
> >>>> (2.4.26) and patch the kernel for SATA support (I'm not sure on how to
> >>>> do that, but I think it can be done).
> >>>>     
> >>>>         
> >>>   
> >>>
> >>>
> >>>
> >>> Using Tomcat but need to do more? Need to support web services, security?
> >>> Get stuff done quickly with pre-integrated technology to make your job easier
> >>> Download IBM WebSphere Application Server v.1.0.1 based on Apache Geronimo
> >>> http://sel.as-us.falkag.net/sel?cmd=lnk&kid=120709&bid=263057&dat=121642
> >>> _______________________________________________
> >>> openMosix-general mailing list
> >>> openMosix-general-5NWGOfrQmneRv+LV9MX5uipxlwaOVQ5f@public.gmane.org
> >>> https://lists.sourceforge.net/lists/listinfo/openmosix-general
> >>>
> >>>   
> >>>       
> >
> >
> > Using Tomcat but need to do more? Need to support web services, security?
> > Get stuff done quickly with pre-integrated technology to make your job easier
> > Download IBM WebSphere Application Server v.1.0.1 based on Apache Geronimo
> > http://sel.as-us.falkag.net/sel?cmd=lnk&kid=120709&bid=263057&dat=121642
> > _______________________________________________
> > openMosix-general mailing list
> > openMosix-general-5NWGOfrQmneRv+LV9MX5uipxlwaOVQ5f@public.gmane.org
> > https://lists.sourceforge.net/lists/listinfo/openmosix-general
> >
> >   
> 


Using Tomcat but need to do more? Need to support web services, security?
Get stuff done quickly with pre-integrated technology to make your job easier
Download IBM WebSphere Application Server v.1.0.1 based on Apache Geronimo
http://sel.as-us.falkag.net/sel?cmd=lnk&kid=120709&bid=263057&dat=121642