Read endpoint for grafana5 throws invalid memory address or nil pointer dereference

[ximply]

Prometheus 2.3 (and 2.2.1 is ok) use as a read endpoint for grafana5 will throw a error like this:

level=error ts=2018-06-08T02:39:50.80339667Z caller=stdlib.go:89 component=web caller="http: panic serving 192.168.10.176:31525" msg="runtime error: invalid memory address or nil pointer dereference"

192.168.10.176 is the grafana server

[brian-brazil]

Can you clarify what you mean by "read endpoint"? Which URL is Grafana hitting?

[ximply]

Sorroy, read enpoint is remote read endpoint.

The setting of grafana datasource for prometheus:
the HTTP URL is http://192.168.10.248:8080
the HTTP Access is proxy

[ximply]

Here are the settings:

[brian-brazil]

Grafana doesn't use the remote read endpoint. Can you capture the HTTP request in question?

[ximply]

But I use Prometheus 2.2.1, it is ok.

[y2sarakawa]

Grafana 5 accesses the Prometheus /series endpoint when referring to variables.

If more than one entry is in remote_read, nil is passed to "p * storage.SelectParams" in ToQuery () of storage/remote/codec.go.

After merging #4122, nil pointer dereference will occur to refer to "p" when creating ReadHints in ToQuery ().
https://github.com/prometheus/prometheus/blob/v2.3.0/storage/remote/codec.go#L96

Please also see #4205.

[brian-brazil]

Looks like a dupe of #4205 alright.

[lock]

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