goroutine 8 [sleep]:
time.Sleep(0xf4240)
        /usr/local/go/src/runtime/time.go:193 +0xd2
github.com/prometheus/prometheus/tsdb.(*Head).loadWAL(0xc0000f0800, 0xc076338000, 0xc0000d7e08, 0xc0005905a0, 0x0, 0x0)
        /home/vagrant/src/github.com/prometheus/prometheus/tsdb/head_wal.go:225 +0x11f7
github.com/prometheus/prometheus/tsdb.(*Head).Init(0xc0000f0800, 0x0, 0x0, 0x0)
        /home/vagrant/src/github.com/prometheus/prometheus/tsdb/head.go:513 +0xa25
github.com/prometheus/prometheus/tsdb.BenchmarkLoadFileWAL(0xc000022240)
        /home/vagrant/src/github.com/prometheus/prometheus/tsdb/loadwal_test.go:21 +0x148
testing.(*B).runN(0xc000022240, 0x1)
        /usr/local/go/src/testing/benchmark.go:192 +0xeb
testing.(*B).run1.func1(0xc000022240)
        /usr/local/go/src/testing/benchmark.go:232 +0x57
created by testing.(*B).run1
        /usr/local/go/src/testing/benchmark.go:225 +0x7f

goroutine 50 [select, 2 minutes]:
github.com/prometheus/prometheus/tsdb/wal.(*WAL).run(0xc000060000)
        /home/vagrant/src/github.com/prometheus/prometheus/tsdb/wal/wal.go:332 +0xbc
created by github.com/prometheus/prometheus/tsdb/wal.NewSize
        /home/vagrant/src/github.com/prometheus/prometheus/tsdb/wal/wal.go:301 +0x325

goroutine 86 [chan receive, 2 minutes]:
github.com/prometheus/prometheus/tsdb.(*Head).processWALSamples(0xc0000f0800, 0x0, 0xc047fb95c0, 0xc047fb9560, 0x0)
        /home/vagrant/src/github.com/prometheus/prometheus/tsdb/head_wal.go:366 +0x12f
github.com/prometheus/prometheus/tsdb.(*Head).loadWAL.func6(0xc0000f0800, 0xc075e9ad60, 0xc075e9ad70, 0xc047fb95c0, 0xc047fb9560)
        /home/vagrant/src/github.com/prometheus/prometheus/tsdb/head_wal.go:97 +0x48
created by github.com/prometheus/prometheus/tsdb.(*Head).loadWAL
        /home/vagrant/src/github.com/prometheus/prometheus/tsdb/head_wal.go:96 +0x405

goroutine 91 [chan send, 2 minutes]:
github.com/prometheus/prometheus/tsdb.(*Head).loadWAL.func8(0xc047fb9500, 0xc076338000, 0xee9cb0, 0xc075c38c30, 0xc00675f040, 0xc0069a2000, 0xc075c38c60, 0xc075c38c90, 0xc075c38cc0)
        /home/vagrant/src/github.com/prometheus/prometheus/tsdb/head_wal.go:154 +0x1f6
created by github.com/prometheus/prometheus/tsdb.(*Head).loadWAL
        /home/vagrant/src/github.com/prometheus/prometheus/tsdb/head_wal.go:126 +0x609

goroutine 88 [chan send, 2 minutes]:
github.com/prometheus/prometheus/tsdb.(*Head).processWALSamples(0xc0000f0800, 0x0, 0xc047fb9740, 0xc047fb96e0, 0x0)
        /home/vagrant/src/github.com/prometheus/prometheus/tsdb/head_wal.go:390 +0xfd
github.com/prometheus/prometheus/tsdb.(*Head).loadWAL.func6(0xc0000f0800, 0xc075e9ad60, 0xc075e9ad70, 0xc047fb9740, 0xc047fb96e0)
        /home/vagrant/src/github.com/prometheus/prometheus/tsdb/head_wal.go:97 +0x48
created by github.com/prometheus/prometheus/tsdb.(*Head).loadWAL
        /home/vagrant/src/github.com/prometheus/prometheus/tsdb/head_wal.go:96 +0x405

goroutine 87 [chan send, 2 minutes]:
github.com/prometheus/prometheus/tsdb.(*Head).processWALSamples(0xc0000f0800, 0x0, 0xc047fb9680, 0xc047fb9620, 0x0)
        /home/vagrant/src/github.com/prometheus/prometheus/tsdb/head_wal.go:390 +0xfd
github.com/prometheus/prometheus/tsdb.(*Head).loadWAL.func6(0xc0000f0800, 0xc075e9ad60, 0xc075e9ad70, 0xc047fb9680, 0xc047fb9620)
        /home/vagrant/src/github.com/prometheus/prometheus/tsdb/head_wal.go:97 +0x48
created by github.com/prometheus/prometheus/tsdb.(*Head).loadWAL
        /home/vagrant/src/github.com/prometheus/prometheus/tsdb/head_wal.go:96 +0x405

goroutine 89 [chan receive, 2 minutes]:
github.com/prometheus/prometheus/tsdb.(*Head).processWALSamples(0xc0000f0800, 0x0, 0xc047fb9800, 0xc047fb97a0, 0x0)
        /home/vagrant/src/github.com/prometheus/prometheus/tsdb/head_wal.go:366 +0x12f
github.com/prometheus/prometheus/tsdb.(*Head).loadWAL.func6(0xc0000f0800, 0xc075e9ad60, 0xc075e9ad70, 0xc047fb9800, 0xc047fb97a0)
        /home/vagrant/src/github.com/prometheus/prometheus/tsdb/head_wal.go:97 +0x48
created by github.com/prometheus/prometheus/tsdb.(*Head).loadWAL
        /home/vagrant/src/github.com/prometheus/prometheus/tsdb/head_wal.go:96 +0x405

goroutine 90 [chan receive, 2 minutes]:
github.com/prometheus/prometheus/tsdb.(*Head).loadWAL.func7(0xc075e9ad70, 0xc0000f0800, 0xc075e9ad68, 0xc00675f040, 0xc047fb9860)
        /home/vagrant/src/github.com/prometheus/prometheus/tsdb/head_wal.go:107 +0x9f
created by github.com/prometheus/prometheus/tsdb.(*Head).loadWAL
        /home/vagrant/src/github.com/prometheus/prometheus/tsdb/head_wal.go:105 +0x57d