Server crash occurred when a player placed a Router Reborn storage unit (barrel equivalent), tier 1 next to a Logistics Pipes logistics chassis mk 2, with a provider and item sink (polymorphic). Looks like the storage unit and the logistics chassis went into an infinite loop and eventually caused a server stack overflow. Crash log located at https://bpaste.net/show/940b8d282b0a.
Mod versions in use:
Buildcraft 7.0.8 with buildcraft-compat-7.0.7
Logistics pipes 0.10.0.1
Router Reborn 220.127.116.11
UPDATE: I am informed the problem was a block-update loop, now fixed in Router Reborn 18.104.22.168.
Right, that issue was not on our side. Either way: please open bugreports on GitHub as said in the forum post.