Re: cfservd segmentation faults

[Jeremy Dreese]

Upgrading to v2.1.0b3 seems to have fixed the problem.  I'll admit that I'm a
little curious as to why (if you don't mind taking the time to explain).

Thanks a bunch!!

Quoting Mark.Burgess@iu.hio.no:
> 
> This looks like the usual bug in the resolver libraries.
> Somewhere in nsswitch.conf or equivalent, you might have
> something that says you looks up hostnames in NIS or files
> before dns. This tends to cause this problem. 
> 
> You can also try 2.1.0b3 which might solve the problem in
> a different way...
> 
> M
> 
> On 27 Sep, Jeremy Dreese wrote:
> > 
> > I wasn't sure whether to post this here or the bug list but here it is...
> > 
> > I recently upgraded from version 2.0.4 to 2.0.8p1 and I've been receiving
> > segmentation faults from cfservd on my cfengine server.  Debugging mode
> > (--debug) didn't seem to provide helpful info because it seemed to seg
> fault at
> > different places each time (probably just different amounts of output
> buffered
> > before the seg fault?).  So I recompiled with debugging on (-g to compiler)
> and
> > had cfservd crash twice with similar info.  I don't know much about using
> gdb,
> > but from a previous post I saw that it was suggested to run "gdb -c core
> > /path/to/cfservd" and then type "backtrace".  Here's what I received:
> > 
> > Core was generated by `/var/cfengine/bin/cfservd --debug'.
> > Program terminated with signal 11, Segmentation fault.
> > #0  0x40095bc2 in ?? ()
> > (gdb) backtrace
> > #0  0x40095bc2 in ?? ()
> > #1  0x4008c561 in ?? ()
> > #2  0x4008c61e in ?? ()
> > #3  0x40093ee5 in ?? ()
> > #4  0x4001e323 in ?? ()
> > #5  0x4001ecd0 in ?? ()
> > #6  0x08170020 in gethostbyname2_r ()
> > #7  0x0816a5c0 in gaih_inet ()
> > #8  0x0816aba2 in getaddrinfo ()
> > #9  0x0804bec2 in VerifyConnection (conn=0x40259700, 
> >     buf=0xbadfea62 "134.82.133.1 alcor.eg.bucknell.edu root 0")
> >     at cfservd.c:1792
> > #10 0x0804a581 in BusyWithConnection (conn=0x40259700) at cfservd.c:1212
> > #11 0x0804a1c3 in HandleConnection (conn=0x40259700) at cfservd.c:1112
> > #12 0x08136b2b in pthread_start_thread ()
> > 
> > I'm wondering if any of this is load related.  I have around 100-110 hosts
> > connecting to one server with a splay time of 30 minutes.
> > 
> > Let me know if there's anything else I can provide.  Thanks in advance for
> the help!
> > 
> > 
> > 
> > _______________________________________________
> > Help-cfengine mailing list
> > Help-cfengine@gnu.org
> > http://mail.gnu.org/mailman/listinfo/help-cfengine
> 
> 
> 
> ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
> Work: +47 22453272            Email:  Mark.Burgess@iu.hio.no
> Fax : +47 22453205            WWW  :  http://www.iu.hio.no/~mark
> ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
> 
> 


-----------------------------------------
Jeremy Dreese
Engineering Computing Systems Integrator
College of Engineering
Bucknell University
voice: (570) 577-3714
fax: (570) 577-3579
email: jdreese@bucknell.edu