"stackdumps unavailable" in Stderr output
can someone please explain to me what this message means?
is this something I should be worried about?

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Most information in the stderr.txt output is information about the task that's of use for the project. It's usually also only the first 64 kilobytes (or last 64kb, I forget) of information that's sent.
In the case of an error, the information within can be helpful to the user, so he can see what went wrong with the task and if it's his (hardware's) fault.

Now, the "stackdumps unavailable" message won't have been on its own. There will have been a lot of information before and after it.
I've checked all your tasks and none show an error, so I assume this task was deleted from the server already. They only stay visible for 24 hours after completion (report + validation). But an old thread had the same thing, the full error is "one or more symbols not found. stackdumps unavailable".

Stackdumps are made by the operating system and for the developers to determine what crashed, symbol files are downloaded for the operating system that show in some more detail what the code did. When the science application's code does give the command to download the symbols, but they cannot be downloaded (probably because they moved server), then there'll be errors about that. The stackdump cannot be made correctly, hence the message that they're unavailable.

Is this something you can fix? No. Unless you know your way around C, C++ and want to peruse the source code of the science application to see which symbol-servers it calls for when an error, and check if those symbol-servers are still where they ought to be. Else just leave it to the project. They'll have sent out a third copy of the task already and if everyone has an error on it, they'll check the task. Nothing to worry about, no science is lost.

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Full disclosure: although I have seen the message on this project before, this time the "stackdumps" messages I am getting are actually from tasks on a different project. I just asked here because I figured with the higher visibility with Seti@home I was more likely to receive an answer. So thank you for the answer and I appreciate the help.

If anyone is curious the specific link with the message is http://moowrap.net/result.php?resultid=79660315
I'm still a bit confused as to why it came up, since the task seems to have otherwise completed without a hitch, but again, since it's at a different project I'm not expecting to receive help here.

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