*** buffer overflow detected ***: unity8 terminated ... in MirEvent::deserialize(std::string const&)

*** buffer overflow detected ***: unity8 terminated ... in MirEvent::deserialize(std::string const&)

From one user's unity8.log:

qtmir.mir: Command line arguments passed to Qt: ("unity8")
[2016-10-05 15:44:31.663159] mirserver: Starting
[2016-10-05 15:44:31.670542] mirserver: Using nested cursor
*** buffer overflow detected ***: unity8 terminated
======= Backtrace: =========
/lib/x86_64-linux-gnu/libc.so.6(+0x77725)[0x7fc167c71725]
/lib/x86_64-linux-gnu/libc.so.6(__fortify_fail+0x5c)[0x7fc167d1289c]
/lib/x86_64-linux-gnu/libc.so.6(+0x1168a0)[0x7fc167d108a0]
/usr/lib/x86_64-linux-gnu/libmircommon.so.6(_ZN8MirEvent11deserializeERKNSt7__cxx1112basic_stringIcSt11char_traitsIcESaIcEEE+0x79)[0x7fc15d3aa9a9]
/usr/lib/x86_64-linux-gnu/libmirclient.so.9(_ZN3mir6events17deserialize_eventERKNSt7__cxx1112basic_stringIcSt11char_traitsIcESaIcEEE+0x1d)[0x7fc15f50667d]
/usr/lib/x86_64-linux-gnu/libmirclient.so.9(+0x51fad)[0x7fc15f4fafad]
/usr/lib/x86_64-linux-gnu/libmirclient.so.9(+0x4b857)[0x7fc15f4f4857]
/usr/lib/x86_64-linux-gnu/libmirclient.so.9(+0x572d3)[0x7fc15f5002d3]
/usr/lib/x86_64-linux-gnu/libmirclient.so.9(+0x4c0ed)[0x7fc15f4f50ed]
/usr/lib/x86_64-linux-gnu/libmirclient.so.9(+0x4c1d7)[0x7fc15f4f51d7]
/usr/lib/x86_64-linux-gnu/libmircommon.so.5(_ZN3mir8dispatch24MultiplexingDispatchable8dispatchEj+0x134)[0x7fc15e500354]
/usr/lib/x86_64-linux-gnu/libmircommon.so.5(_ZN3mir8dispatch24MultiplexingDispatchable8dispatchEj+0x134)[0x7fc15e500354]
/usr/lib/x86_64-linux-gnu/libmircommon.so.5(+0x2081f)[0x7fc15e50f81f]
/usr/lib/x86_64-linux-gnu/libmircommon.so.5(+0x187fe)[0x7fc15e5077fe]
/usr/lib/x86_64-linux-gnu/libstdc++.so.6(+0xb8c80)[0x7fc168291c80]
/lib/x86_64-linux-gnu/libpthread.so.0(+0x76fa)[0x7fc1679e46fa]
/lib/x86_64-linux-gnu/libc.so.6(clone+0x6d)[0x7fc167d00b5d]