"Unable to increase stack" is one of the various messages that tells you that 
PolyML has run out of resources. It doesn't really tell you what the problem is 
though. It might be an actual problem or a temporary problem caused by a 
machine being overloaded.

Cheers,
    Thomas.

On 2019-03-12 12:14, Lawrence Paulson wrote:
Does anybody know what this is?

01:58:19 Running HOL-Quickcheck_Benchmark ...01:58:20 HOL-Quickcheck_Benchmark: 
theory HOL-Quickcheck_Benchmark.Needham_Schroeder_Base01:58:20 
HOL-Quickcheck_Benchmark: theory 
HOL-Quickcheck_Benchmark.Find_Unused_Assms_Examples01:58:23 
HOL-Quickcheck_Benchmark: theory 
HOL-Quickcheck_Benchmark.Needham_Schroeder_Guided_Attacker_Example01:58:24 
HOL-Quickcheck_Benchmark: theory 
HOL-Quickcheck_Benchmark.Needham_Schroeder_No_Attacker_Example01:58:24 
HOL-Quickcheck_Benchmark: theory 
HOL-Quickcheck_Benchmark.Needham_Schroeder_Unguided_Attacker_Example02:12:01 
Warning - Unable to increase stack - interrupting thread02:12:01 *** 
Interrupt02:12:01 HOL-Quickcheck_Benchmark FAILED

Larry

> Begin forwarded message:
>
> From: Isabelle/Jenkins <ci@isabelle.systems><mailto:ci@isabelle.systems>
> Subject: [Isabelle-ci] Build failure in Isabelle (benchmark)
> Date: 12 March 2019 at 01:22:32 GMT
> To: 
> isabelle...@mail46.informatik.tu-muenchen.de<mailto:isabelle...@mail46.informatik.tu-muenchen.de>
>
> The Isabelle build failed. See the log at: 
> https://ci.isabelle.systems/jenkins/job/isabelle-nightly-benchmark/887/
> _______________________________________________
> Isabelle-ci mailing list
> isabelle...@mail46.informatik.tu-muenchen.de<mailto:isabelle...@mail46.informatik.tu-muenchen.de>
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