#1145937 prometheus: flaky test FTBFS: FAIL: TestHeadCompactionWhileScraping

Package:
prometheus
Source:
prometheus
Description:
monitoring system and time series database
Submitter:
Simon Josefsson
Date:
2026-08-28 05:51:02 UTC
Severity:
normal
#1145937#5
Date:
2026-08-28 05:49:04 UTC
From:
To:
Hi!  This package has what appears to be a flaky test FTBFS, triggering
testing migration blocking.

https://ci.debian.net/packages/p/prometheus/testing/ppc64el/74738064/#L5561

1090s === NAME  TestHeadCompactionWhileScraping/0
1090s     reload_test.go:196: time=2026-08-27T04:30:47.973Z level=INFO source=head.go:1410 msg="Head GC completed" component=tsdb caller=truncateMemory duration=500.313039ms
1090s === NAME  TestHeadCompactionWhileScraping/3
1090s     reload_test.go:196: time=2026-08-27T04:30:48.489Z level=INFO source=compact.go:606 msg="write block" component=tsdb mint=1787805042774 maxt=1787805042800 ulid=01M10QR2SV7WYAWZRMENKZ7ECM duration=4.973535227s ooo=false
1090s     reload_test.go:196: time=2026-08-27T04:30:48.651Z level=INFO source=head.go:1410 msg="Head GC completed" component=tsdb caller=truncateMemory duration=162.107072ms
1090s === NAME  TestHeadCompactionWhileScraping/4
1090s     reload_test.go:196: time=2026-08-27T04:30:50.879Z level=INFO source=compact.go:606 msg="write block" component=tsdb mint=1787805042818 maxt=1787805042900 ulid=01M10QR2YRVE5GXQPMGJDC21RF duration=7.206925791s ooo=false
1090s     reload_test.go:196: time=2026-08-27T04:30:51.242Z level=INFO source=head.go:1410 msg="Head GC completed" component=tsdb caller=truncateMemory duration=363.099117ms
1090s     main_test.go:853:
1090s         	Error Trace:	/tmp/autopkgtest.Bsdxr9/autopkgtest_tmp/.build/src/github.com/prometheus/prometheus/cmd/prometheus/main_test.go:853
1090s         	Error:      	Condition never satisfied
1090s         	Test:       	TestHeadCompactionWhileScraping/4
1090s === NAME  TestHeadCompactionWhileScraping/0
1090s     main_test.go:853:
1090s         	Error Trace:	/tmp/autopkgtest.Bsdxr9/autopkgtest_tmp/.build/src/github.com/prometheus/prometheus/cmd/prometheus/main_test.go:853
1090s         	Error:      	Condition never satisfied
1090s         	Test:       	TestHeadCompactionWhileScraping/0
1090s === NAME  TestHeadCompactionWhileScraping/3
1090s     main_test.go:853:
1090s         	Error Trace:	/tmp/autopkgtest.Bsdxr9/autopkgtest_tmp/.build/src/github.com/prometheus/prometheus/cmd/prometheus/main_test.go:853
1090s         	Error:      	Condition never satisfied
1090s         	Test:       	TestHeadCompactionWhileScraping/3
1090s === NAME  TestHeadCompactionWhileScraping/1
1090s     main_test.go:853:
1090s         	Error Trace:	/tmp/autopkgtest.Bsdxr9/autopkgtest_tmp/.build/src/github.com/prometheus/prometheus/cmd/prometheus/main_test.go:853
1090s         	Error:      	Condition never satisfied
1090s         	Test:       	TestHeadCompactionWhileScraping/1
1090s === NAME  TestHeadCompactionWhileScraping/2
1090s     main_test.go:853:
1090s         	Error Trace:	/tmp/autopkgtest.Bsdxr9/autopkgtest_tmp/.build/src/github.com/prometheus/prometheus/cmd/prometheus/main_test.go:853
1090s         	Error:      	Condition never satisfied
1090s         	Test:       	TestHeadCompactionWhileScraping/2
1090s --- FAIL: TestHeadCompactionWhileScraping (0.00s)
1090s     --- FAIL: TestHeadCompactionWhileScraping/1 (15.45s)
1090s     --- FAIL: TestHeadCompactionWhileScraping/4 (15.59s)
1090s     --- FAIL: TestHeadCompactionWhileScraping/2 (15.75s)
1090s     --- FAIL: TestHeadCompactionWhileScraping/3 (15.96s)
1090s     --- FAIL: TestHeadCompactionWhileScraping/0 (16.11s)
1090s FAIL
1090s FAIL	github.com/prometheus/prometheus/cmd/prometheus	24.511s

/Simon