Hi,

We recently started seeing our Jenkins instance getting OOM killed, and believe that we have tracked it down to the https://jenkins/blue/rest/organizations/jenkins/pipelines/.../runs/X/nodes/X/steps/X/log/?start=X REST API.

The GC log contains the following entry for a request with ?start=451159112:

Heap expansion (humongous allocation request). Allocation request: 451159760B

This line looks like a likely suspect: https://github.com/jenkinsci/blueocean-plugin/blob/master/blueocean-rest-impl/src/main/java/io/jenkins/blueocean/service/embedded/rest/LogResource.java#L73

I haven't checked whether newer versions of blueocean are also affected yet.

Thanks,

Matt