I am running Boinc client 6.2.18-3ubuntu1. I have periodically got signal 11 errors, the current one is Task 82687790.

The only other error messages are unrecognized xml commands; I assume that's because I have an older client program, and that they are harmless.

I will turn on debugging if you want me to. I believe the problem has something to do with network communications activity while processing, as that seemed strongly related with other projects that got signal 11.

On this page it gives this:
http://boincfaq.mundayweb.com/index.php?language=1&viewCat=3
Process got signal 11

This error can be caused by the infamous segmentation error (SIGSEGV error), meaning that something broke. be it your memory, virtual memory (page file) or it's a bad batch of tasks.

Check your system with memtest86+, make your page file anew, keep a tab on whether you're the only one returning these errors, or that others have them at the same time as well. If you are the only one, it's something on your system, if there are lots more, it's a bad batch of work.

But it can also happen when you use a 64bit operating system, while the project you're getting the crashes on only gives out 32bit applications (such as Einstein does). Installing the ia32 library package will fix this problem. See also process exited with code 22 which is a similar error, on the application level.

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Doesn't expecting the unexpected make the unexpected the expected?
If it makes sense, DON'T do it.