[Click] Causing Kernel Panics Via Click

[Joonwoo Park]

Hi David,

If you are using linux 2.6.16.13
Just doing update your click source to lastest revision from cvs or
git may can solve problem. (without update kernel and compile)

Joonwoo Park

2007/9/14, dmoore7 at nd.edu <dmoore7 at nd.edu>:
> Thanks Eddie,
> I will do that.  I assume it will be necesary to repatch and recompile the
> kernel?
> Should I re-download the vanilla sources from kernel.org and patch from those,
> or is it possible to patch the already patched ones I have now.
> Thanks,
>  - David
>
> Quoting Eddie Kohler <kohler at cs.ucla.edu>:
>
> > It would certainly be helpful if you could upgrade filius to current CVS.
> > Much spinlock stuff has happened there recently.
> >
> > E
> >
> >
> > dmoore7 at nd.edu wrote:
> > > Hello Everyone,
> > > I have encounted a slightly unreliable method of bringing down one of my
> > click
> > > machines.  I shall present an example below of how it happens.
> > >
> > >> Log into to freshly booted machine
> > >> Succesfully load locally stored click file
> > >> Ping another machine via the click router
> > >> Use w3c's webbot to successfully download a webpage from another host
> > >> Do so again, again with proper results
> > >> Execute click-uninstall
> > >> Reload the same kernel config I had loaded earlier
> > >
> > >> Meanwhile, in another ssh window to the webserver I have tcpdump running,
> > and
> > > have been watching the traffic coming in and out.
> > >
> > >> I execute the same webbot command as previously, with the following output
> > > (copy-pasted from the uninstall onward)
> > >
> > > [root at filius ~]# click-uninstall [root at filius ~]# click-install
> > > ./Filius-1-50.click
> > > [root at filius ~]# webbot -I spoof_eth2_0 -q -n -saveimg
> > > http://192.168.10.4/index3.html
> > > Message from syslogd at filius at Thu Sep 13 12:59:52 2007 ...
> > > filius kernel: BUG: spinlock wrong CPU on CPU#2, click-uninstall/4890
> > >
> > > Message from syslogd at filius at Thu Sep 13 12:59:52 2007 ...
> > > filius kernel:  lock: f8c79c44, .magic: dead4ead, .owner:
> > click-uninstall/4890,
> > > .owner_cpu: 3
> > >
> > > <after about 5 minutes>
> > > Read from remote host filius.cse.nd.edu: Connection timed out
> > > Connection to filius.cse.nd.edu closed.
> > >
> > >> During this I have been watching tcpdump on the http server, and it is
> > > proceeding until suddenly it stops receiving ack's.
> > >> Thus it appears the click module began malfunctioning mid-use, and not
> > simply
> > > upon its loading.
> > >
> > > Background information:
> > >  - There are 3 machines with click loaded on them, the config files I used
> > can
> > > be found here:
> > > Filius (the one that crashed): http://cse.nd.edu/~dmoore7/Filius-1-50.click
> > > Sybill (the forwarder): http://cse.nd.edu/~dmoore7/Sybill-1-50.click
> > > Hagrid (the http host): http://cse.nd.edu/~dmoore7/Hagrid-1-50.click
> > >  - For a general idea of what these router configs do, see this diagram:
> > > http://cse.nd.edu/~dmoore7/myrouter.jpg
> > >  - The webbot I used is a slightly hacked version of w3c's webbot (modified
> > to
> > > allow forcing of a particular device).  It exhibits no failures without
> > click.
> > >  - Filius is running a version of click downloaded about 3 weeks ago from
> > the
> > > cvs.  The others are running 1.5.0 downloaded from the click website during
> > the
> > > middle of this past summer.  I can update filius if that may be helpful.
> > >  - The systems in question have 4 processors, I believe technically 2 core
> > duo's
> > > each.
> > >  - Kernel is a vanilla 2.6.16.13 from kernel.org w/ click patch applied
> > >  - This appears to be related to an earlier problem I reported here, which
> > at
> > > first appeared to be resolved:
> > > https://pdos.csail.mit.edu/pipermail/click/2007-August/006206.html
> > >
> > > Any input is appreciated, I will try to get crash dumps and such when I
> > regain
> > > access to the machine, as it is not local I must wait for someone else to
> > > reboot it for me.
> > > Thanks,
> > >  - David
> > >
> > >
> > > _______________________________________________
> > > click mailing list
> > > click at amsterdam.lcs.mit.edu
> > > https://amsterdam.lcs.mit.edu/mailman/listinfo/click
> >
>
>
>
>
>
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