[issue952] system hang with rsync

[Vincent Stemen]

On Sun, Mar 16, 2008 at 12:57:17PM -0700, Matthew Dillon wrote:
>     Do you have a console on the server?  Can you break into DDB?
>
>     When it hangs you can break into DDB with control-alt-escape and do a
>     'ps' to see what (probably many) processes are stuck on.  That will
>     give us a starting point.  You can then 'cont' to continue operation.
>
>     I'm sure you probably do not want to crash the box but if you don't
>     mind and have core dumps enabled and can get a core while it is 'stuck',
>     that will give us the most information.  If you want to go that route
>     I can give you a leaf.dragonflybsd.org account to upload the core into
>     so the developers can have a look at it (just supply me with your public
>     dsa key for ssh and your desired username and I will create the leaf
>     account).

Hi Matt.

Thanks for the instructions.  It made us a little nervous :-), but
I went ahead and crashed it and tried to get a core dump.  However, Our
swap partition was apparently not big enough :-(.  We set up a test
machine with another SATA hard drive (to duplicate the environment as
closely as possible, in case hardware type has anythin to do with the
problem) with a bigger swap partition.  Luckily, we had a spare drive we
had not installed yet.  We are in the process of copying the 45 GB file
system to it over the LAN.  Hopefully we can reproduce the problem and
get a kernel core dump on that machine.  If so, I will send it to you.
It may be at least another day or two.

If we successfully reproduce the problem and get a kernel core dump,
I will go ahead and send you a username and dsa key in a private email
for a leaf account.