[Beowulf] /lib/tls/libc.so.6 or libc-2.3.5.so vmadump errors

Mattijs Janssens m.janssens at opencfd.co.uk
Tue Feb 21 08:54:25 EST 2006


I don't know if this has anything to do with your problem but I 
sometimes get problems with the nodes failing to access the master 
(though dhcp) since their network card are still being initialized.

I got the suggestion to put some 'sleep xxx' somewhere in the boot 
sequence so the network cards are given time to reset and register with 
the switch etc. but haven't tried it.


scunacc wrote:
> Dear folks,
> 
> I am trying to establish a clustermatic 5 setup on a 2.6.9 custom built
> kernel backported to a stock Mandriva 2006 build (with all of the latest
> patches applied as of Saturday)
> 
> No problem on the headnode kernel or the CM5 host utils booting.
> 
> However, the slaves *intermittently* do not properly copy the libs over
> and I get 
> 
> vmadump: mmap failed: /lib/tls/libc.so.6
> 
> or
> 
> vmadump: mmap failed: /lib/tls/libc-2.3.5.so
> 
> Now, the first is a symlink to the other. 
> 
> Also, strace on a simple binary (e.g. mkdir, shows that it is indeed
> trying to load *that* version of the C lib 1st.)
> 
> I've messed around with taking that out of the path and linking
> libc.so.6 to various other libc*so*'s in /usr/lib or /lib, with the same
> results. It will sometimes boot, sometimes not.
> 
> This looks like a random library ordering issue.
> 
> Or, perhaps a timing issue where something that is being called in the C
> lib is causing vmadump to burp.
> 
> It's happening in the node_up stage tho' if it happens.
> 
> *Sometimes* the nodes will boot OK.
> 
> ----
> 
> Note: I have a happily running CM5 setup on several other machines with
> FC4 as the core OS and basically the same custom CM5 kernel on top -
> it's something funky with the M2006 C libraries AFAICS. Threading
> perhaps? Not sure. 
> 
> I have other reasons for going with M2006.
> 
> I didn't fancy backporting the basic bproc code to a 2.6.12* or 2.6.15
> kernel, so I simply used (custom rebuilt the same as on the FC4
> clusters) the 2.6.9 kernel from CM5.
> 
> Do let me know if you have any ideas.
> 
> Thanks!
> 
> Kind regards
> 
> Derek Jones.
> 
> 
> 
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> 


-- 
Best regards,

Mattijs

Mattijs Janssens

OpenCFD Ltd.
The Mews, Picketts Lodge,
Picketts Lane, Salfords,
Surrey RH1 5RG.
Tel: +44 (0)1293 821272
Email: M.Janssens at OpenCFD.co.uk
URL: http://www.OpenCFD.co.uk
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