Re: segfault on copy

[Mark . Burgess]

If you can run the program in gdb, e.g.

gdb /local/sbin/cfagent

run -d2

(segfault)

back


and mail me the resulting output I can look into it when I get back from
a trip next week. I haven't seen any segfaults in copy for a
long time.

Mark

On 29 May, Matt McLeod wrote:
> Currently testing copy with three hosts:  (1)  Solaris 8 on Intel
> (faramir);  (2)  Solaris 8 on UltraSPARC (bruce);  (3)  Debian Linux 
> 'testing' branch on Intel (buffy).  cfengine 2.0.2, also tested and got
> the same results with 2.0.1.
> 
> With the following rule in place on faramir:
> 
> copy:
>   faramir.copytest::
>     /local
>       dest=/sw/solaris/local
>       recurse=inf
>       server=bruce
>       trustkey=true
> 
> I consistently get a segfault+core dump on the same file:
> 
> cfengine:faramir: Server returned error:  Host authentication failed. Did
> you forget the domain name?
> cfengine:faramir: (Can't stat /local/bin/ris/local/lib/uSystem/bin/moncc)
> zsh: segmentation fault (core dumped)  /var/cfengine/bin/cfagent -v
> --no-splay -D copytest
> 
> The source file is /local/bin/moncc, which is a symlink;
> 
> lrwxrwxrwx   1 root     other         24 Oct  4  2001 moncc -> 
> ../lib/uSystem/bin/moncc
> 
> The symlink has been created on the destination host before the segfault.
> 
> Restarting cfagent, again segfaulting after a while.  The file is
> consistently the same one, another symlink:
> 
> cfengine:faramir: Server returned error:  Host authentication failed. Did
> you forget the domain name?
> cfengine:faramir: (Can't stat 
> /local/bin/ris/local/lib/java-1.3/bin/native2ascii)
> zsh: segmentation fault (core dumped)  /var/cfengine/bin/cfagent -v
> --no-splay -D copytest
> 
> lrwxrwxrwx   1 root     other         32 May 29 12:37
> /sw/solaris/local/bin/native2ascii -> ../lib/java-1.3/bin/native2ascii
> 
> And so it goes.
> 
> Running the same rule on buffy (the Linux box) gets the same result.
> 
> Running a similar rule on buffy, grabbing a different set of files (similar
> amount of data though) from faramir runs into a new and exciting problem:
> 
> copy:
>   do_irix:: /sw/irix/local
>     dest=/sw/irix/local
>     recurse=inf
>     server=faramir
>     trustkey=true
> 
> cfengine:buffy: 
> /sw/irix/local/lib/Acrobat4/Reader/mipsirix/lib/libreadcore.so.4.0 wasn't at 
> destination (copying)
> cfengine:buffy: Copying from 
> faramir:/sw/irix/local/lib/Acrobat4/Reader/mipsirix/lib/libreadcore.so.4.0
> Segmentation fault
> 
> Only this time it isn't a symlink, and the file is copied across to
> leadreadcore.so.4.0.cfnew prior to the segfault.  This is again consistent
> across runs -- same file, same result.
> 
> Adding "purge-true" prompts a much quicker segfault in all cases.
> 
> Unfortunately I don't know enough about using gdb to track this down
> quickly, but the first one does rather scream "problem with handling of
> pointers to char" at me.
> 
> I'd be happy to run any tests anyone wants to try and resolve this,
> as I'd really like to use cfengine to replace rdist in addition to
> the stuff I've already got it doing.
> 
> Matt



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