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Fix histogram pool poisoning bu chunkenc.Iterator

Browse source 
chunkenc.Iterator.AtFloatHistogram may do a shallow copy if
it receives nil as input pointer. This can in turn share the
span slice with multiple histograms in the matrixSelectorHPool,
leading to unexpected errors.

Signed-off-by: György Krajcsovits <gyorgy.krajcsovits@grafana.com>
This commit is contained in:
György Krajcsovits 2024-08-06 07:46:26 +02:00
parent e92a18b6ce
commit 37c8c9257b
1 changed files with 5 additions and 0 deletions
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5
promql/engine.go
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@ -2356,6 +2356,11 @@ loop:
} else {
histograms = append(histograms, HPoint{H: &histogram.FloatHistogram{}})
}
if histograms[n].H == nil {
// Initialize to non zero to AtFloatHistogram does a copy for sure.
// Not an issue in the loop above since that uses an intermediate buffer.
histograms[n].H = &histogram.FloatHistogram{}
}
histograms[n].T, histograms[n].H = it.AtFloatHistogram(histograms[n].H)
if value.IsStaleNaN(histograms[n].H.Sum) {
histograms = histograms[:n]