panic: runtime error: integer divide by zero

[WeiBanjo]

What did you expect to see?
No panic

What did you see instead? Under which circumstances?
Prometheus crashes after running for a day.

Environment
Centos 7.2

• System information:

Linux 3.10.0-327.4.4.el7.x86_64 x86_64

• Prometheus version:

prometheus, version 2.0.0-beta.1 (branch: HEAD, revision: 4dcb465)
build user: root@d3f9974fac5a
build date: 20170811-12:12:36
go version: go1.8.3

• Prometheus configuration file:

global:
  scrape_interval: 600s
  evaluation_interval: 60s
  scrape_timeout: 30s

scrape_configs:
  - job_name: 'prometheus-federation-jmx-exporter'
    scrape_interval: 60s
    scrape_timeout: 60s
    scheme: 'https'
    honor_labels: true
    metrics_path: /federate
    params:
      'match[]':
        - '{job="prod-jmx-exporter"}'
    static_configs:
      - targets:
        - 127.0.0.1:9001
        - 127.0.0.1:9000
  - job_name: 'prometheus-federation-statsd-exporter'
    scrape_interval: 60s
    scrape_timeout: 60s
    scheme: 'https'
    honor_labels: true
    metrics_path: /federate
    params:
      'match[]':
        - '{job="prod-statsd-exporter"}'
    static_configs:
      - targets:
        - 127.0.0.1:9001
        - 127.0.0.1:9000

• Logs:

Aug 12 21:15:56 prometheus[1482]: panic: runtime error: integer divide by zero
Aug 12 21:15:56 prometheus[1482]: goroutine 129 [running]:
Aug 12 21:15:56 prometheus[1482]: github.com/prometheus/prometheus/vendor/github.com/prometheus/tsdb.(*LeveledCompactor).Plan(0xc4204f7ec0, 0x7ffe084aee1f, 0x11, 0x0, 0x15a390f7a00, 0x15dd3bd8800, 0x0, 0x0)
Aug 12 21:15:56 prometheus[1482]: /go/src/github.com/prometheus/prometheus/vendor/github.com/prometheus/tsdb/compact.go:173 +0x621
Aug 12 21:15:56 prometheus[1482]: github.com/prometheus/prometheus/vendor/github.com/prometheus/tsdb.(*DB).compact(0xc4202b0460, 0xc420514e00, 0x0, 0x0)
Aug 12 21:15:56 prometheus[1482]: /go/src/github.com/prometheus/prometheus/vendor/github.com/prometheus/tsdb/db.go:406 +0x2c5
Aug 12 21:15:56 prometheus[1482]: github.com/prometheus/prometheus/vendor/github.com/prometheus/tsdb.(*DB).run(0xc4202b0460)
Aug 12 21:15:56 prometheus[1482]: /go/src/github.com/prometheus/prometheus/vendor/github.com/prometheus/tsdb/db.go:281 +0x3c6
Aug 12 21:15:56 prometheus[1482]: created by github.com/prometheus/prometheus/vendor/github.com/prometheus/tsdb.Open
Aug 12 21:15:56 prometheus[1482]: /go/src/github.com/prometheus/prometheus/vendor/github.com/prometheus/tsdb/db.go:250 +0x488

[klausenbusk]

I just expected the same with 2.0.0-beta.1.
Config:

scrape_configs:
  - job_name: "prometheus"

    static_configs:
      - targets: ['localhost:9090']

  - job_name: 'clients'
    scrape_interval: 30s
    file_sd_configs:
      - files: ["/etc/prometheus/clients.json"]

Log:

time="2017-08-12T21:25:54Z" level=info msg="Starting prometheus (version=2.0.0-beta.1, branch=HEAD, revision=4dcb465029f39a2a3030333a81753f8a40ec90ce)" source="main.go:204" 
time="2017-08-12T21:25:54Z" level=info msg="Build context (go=go1.8.3, user=root@d3f9974fac5a, date=20170811-12:12:36)" source="main.go:205" 
time="2017-08-12T21:25:54Z" level=info msg="Host details (Linux 4.11.11-coreos #1 SMP Tue Jul 18 23:06:59 UTC 2017 x86_64 prometheus-153384988-pdsn7 (none))" source="main.go:206" 
time="2017-08-12T21:25:54Z" level=info msg="Starting tsdb" source="main.go:218" 
time="2017-08-12T21:26:52Z" level=info msg="tsdb started" source="main.go:224" 
time="2017-08-12T21:26:52Z" level=info msg="Loading configuration file /etc/prometheus/prometheus.yml" source="main.go:357" 
time="2017-08-12T21:26:52Z" level=info msg="Starting target manager..." source="targetmanager.go:67" 
time="2017-08-12T21:26:52Z" level=info msg="Server is Ready to receive requests." source="main.go:334" 
time="2017-08-12T21:26:52Z" level=info msg="Listening on 0.0.0.0:9090" source="web.go:327" 
panic: runtime error: integer divide by zero

goroutine 62 [running]:
github.com/prometheus/prometheus/vendor/github.com/prometheus/tsdb.(*LeveledCompactor).Plan(0xc4203b9260, 0x7ffc1cece0c2, 0x13, 0x0, 0x15d8ac8c600, 0x15dd3bd8800, 0x0, 0x0)
	/go/src/github.com/prometheus/prometheus/vendor/github.com/prometheus/tsdb/compact.go:173 +0x621
github.com/prometheus/prometheus/vendor/github.com/prometheus/tsdb.(*DB).compact(0xc4201962a0, 0xc4201acc00, 0x0, 0x0)
	/go/src/github.com/prometheus/prometheus/vendor/github.com/prometheus/tsdb/db.go:406 +0x2c5
github.com/prometheus/prometheus/vendor/github.com/prometheus/tsdb.(*DB).run(0xc4201962a0)
	/go/src/github.com/prometheus/prometheus/vendor/github.com/prometheus/tsdb/db.go:281 +0x3c6
created by github.com/prometheus/prometheus/vendor/github.com/prometheus/tsdb.Open
	/go/src/github.com/prometheus/prometheus/vendor/github.com/prometheus/tsdb/db.go:250 +0x488

Edit:
I just restarted the server and got this in the log (not sure if it is related):

time="2017-08-12T22:31:09Z" level=error msg="Opening storage failed: open block /var/lib/prometheus/01BQC7T69FGJ86BKB44N31NY3W: open WAL %s: invalid magic header 0 in "/var/lib/prometheus/01BQC7T69FGJ86BKB44N31NY3W/wal/000001"" source="main.go:221" 

[lock]

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