forestdb/compactor crashed during statsFd.estimateSpaceUsed()

fatal error: unexpected signal during runtime execution
[signal 0xb code=0x1 addr=0x8 pc=0x7f980ff41f96]

runtime stack:
runtime.gothrow(0xf469d0, 0x2a)
/usr/local/go/src/runtime/panic.go:503 +0x8e
runtime.sigpanic()
/usr/local/go/src/runtime/sigpanic_unix.go:14 +0x5e

goroutine 79 [syscall, locked to thread]:
runtime.cgocall_errno(0x402f7f, 0xc2a4019748, 0x0)
/usr/local/go/src/runtime/cgocall.go:130 +0xf5 fp=0xc2a4019728 sp=0xc2a4019700
github.com/couchbase/indexing/secondary/fdb._Cfunc_fdb_estimate_space_used(0x7f789c431180, 0x0)
/home/couchbase/couchbase/goproj/src/github.com/couchbase/indexing/secondary/fdb/:106 +0x44 fp=0xc2a4019748 sp=0xc2a4019728
github.com/couchbase/indexing/secondary/fdb.(*File).EstimateSpaceUsed(0xc276f62c00, 0x0)
/home/couchbase/couchbase/goproj/src/github.com/couchbase/indexing/secondary/fdb/file.go:116 +0x178 fp=0xc2a40197c0 sp=0xc2a4019748
github.com/couchbase/indexing/secondary/indexer.(*fdbSlice).Statistics(0xc20b73c780, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0)
/home/couchbase/couchbase/goproj/src/github.com/couchbase/indexing/secondary/indexer/forestdb_slice_writer.go:1048 +0x107 fp=0xc2a4019840 sp=0xc2a40197c0
github.com/couchbase/indexing/secondary/indexer.(*storageMgr).getIndexStorageStats(0xc20af2bbc0, 0x0, 0x0, 0x0)