Q2 stale=ok performance test - cgocall/compaction panic

This failure is related to jenkins run (Q2 stale=ok). Build 654 (go 1.5)

http://perf.jenkins.couchbase.com/job/hades/1935/

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fatal error: unexpected signal during runtime execution
[signal 0xb code=0x1 addr=0x0 pc=0x7f56a1f17fab]

runtime stack:
runtime.throw(0x1020960, 0x2a)
/usr/local/go/src/runtime/panic.go:527 +0x90 fp=0x7f5687ffc6b0 sp=0x7f5687ffc698
runtime.sigpanic()
/usr/local/go/src/runtime/sigpanic_unix.go:12 +0x5a fp=0x7f5687ffc700 sp=0x7f5687ffc6b0

goroutine 126034 [syscall, 3 minutes, locked to thread]:
runtime.cgocall(0x4032b7, 0xc91622db98, 0x0)
/usr/local/go/src/runtime/cgocall.go:120 +0x11b fp=0xc91622db50 sp=0xc91622db20
github.com/couchbase/indexing/secondary/fdb._Cfunc_fdb_compact_upto(0x7f462c214090, 0x7f45e4000a40, 0x77dae4, 0xc900000000)
??:0 +0x39 fp=0xc91622db98 sp=0xc91622db50
github.com/couchbase/indexing/secondary/fdb.(*File).CompactUpto(0xc8201e7d70, 0xc87b2f08c0, 0x43, 0xc8b0f46a40, 0x0, 0x0)
/home/couchbase/serverjenkins/workspace/watson-unix/goproj/src/github.com/couchbase/indexing/secondary/fdb/file.go:102 +0x2a4 fp=0xc91622dc28 sp=0xc91622db98
github.com/couchbase/indexing/secondary/indexer.(*fdbSlice).Compact(0xc8236e5500, 0x0, 0x0)
/home/couchbase/serverjenkins/workspace/watson-unix/goproj/src/github.com/couchbase/indexing/secondary/indexer/forestdb_slice_writer.go:980 +0xd27 fp=0xc91622dee0 sp=0xc91622dc28
github.com/couchbase/indexing/secondary/indexer.(*storageMgr).handleIndexCompaction.func1(0xc836a25b40, 0x1, 0x1, 0xc93b6775c0)
/home/couchbase/serverjenkins/workspace/watson-unix/goproj/src/github.com/couchbase/indexing/secondary/indexer/storage_manager.go:834 +0x9a fp=0xc91622df70 sp=0xc91622dee0
runtime.goexit()
/usr/local/go/src/runtime/asm_amd64.s:1696 +0x1 fp=0xc91622df78 sp=0xc91622df70
created by github.com/couchbase/indexing/secondary/indexer.(*storageMgr).handleIndexCompaction
/home/couchbase/serverjenkins/workspace/watson-unix/goproj/src/github.com/couchbase/indexing/secondary/indexer/storage_manager.go:843 +0x480