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When I run valgrind with the options --tool=memcheck --db-attach=yes and then try to attach when an error pops up i get: valgrind: m_debugger.c:235 (ptrace_setregs): Assertion 'Unimplemented functionality' failed. It seems odd to me that this would not be implemented as it is such a core feature to valgrind. Is there a workaround?

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You can upgrade to Valgrind 3.7.0 and use the embedded gdbserver. See Valgrind 3.7.0 user manual for more details

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