Crash after failed assert

[shk656461]

Hi,
I get
src/meshable_arena.cc:509:void mesh::MeshableArena::beginMesh(void*, void*, size_t): ASSERTION 'r == 0' FAILED:
followed by abort().
gcc 7.3.0
CentOS Linux 7
Multi-threaded application, heavy memory usage.
Any ideas?

Thanks,
Andrew