So, this still pops up occasionally:
% rebar skip_deps=true -v eunit suites=machi_flu0_test,machi_chain_manager1
[...]
a private: [{epoch,223},{author,a},{upi,[a,b]},{repair,[]},{down,[c]},{d,[{author_proc,react},{nodes_up,[a,b]}]},{d2,[{up_nodz,[a,b]},{hooray,{v2,{2014,11,3},{20,19,57}}}]}]
b private: [{epoch,224},{author,b},{upi,[b,a]},{repair,[]},{down,[c]},{d,[{author_proc,react},{nodes_up,[a,b]}]},{d2,[{up_nodz,[a,b]},{hooray,{v2,{2014,11,3},{20,19,57}}}]}]
c private: [{epoch,191},{author,c},{upi,[c]},{repair,[]},{down,[a,b]},{d,[{author_proc,react},{nodes_up,[c]}]},{d2,[{up_nodz,[c]},{hooray,{v2,{2014,11,3},{20,19,57}}}]}]
The mis-ordering between [a,b] and [b,a] happens after the partition settled
on the islands of [a,b] and [c].
{ c100 , ? LINE , _AnyOtherReturnValue } {c100,734,
{err,error,
{badmatch,[a,b]},
from,
[{epoch,70},
{author,a},
{upi,[a]},
{repair,[b]},
{down,[c]},
{d,
[{author_proc,react},
{nodes_up,[a,b]}]},
{d2,[]}],
to,
[{epoch,194},
{author,b},
{upi,[b,a]},
{repair,[]},
{down,[c]},
{d,
[{author_proc,react},
{nodes_up,[a,b]}]},
{d2,[]}],
relative_to,a,stack,[...]
0b88a12c16