Panic in the frontend #2179
Description
Found this one today:
2023-07-27 09:05:00.773 golang.org/x/[email protected]/errgroup/errgroup.go:72 +0xa52023-07-27 09:05:00.773created by golang.org/x/sync/errgroup.(*Group).Go2023-07-27 09:05:00.773 golang.org/x/[email protected]/errgroup/errgroup.go:75 +0x642023-07-27 09:05:00.773golang.org/x/sync/errgroup.(*Group).Go.func1()2023-07-27 09:05:00.773 github.com/grafana/pyroscope/pkg/frontend/frontend_select_merge_stacktraces.go:64 +0x21c2023-07-27 09:05:00.773github.com/grafana/pyroscope/pkg/frontend.(*Frontend).SelectMergeStacktraces.func1()2023-07-27 09:05:00.773 github.com/grafana/pyroscope/pkg/model/flamegraph.go:199 +0x1962023-07-27 09:05:00.773github.com/grafana/pyroscope/pkg/model.(*FlameGraphMerger).MergeFlameGraph(0xc000459000, 0xc000162150)2023-07-27 09:05:00.773 github.com/grafana/pyroscope/pkg/model/flamegraph.go:240 +0x2db2023-07-27 09:05:00.773github.com/grafana/pyroscope/pkg/model.buildStack({0xc0004e6900?, 0x180090?, 0xc0004e6900?}, 0xc000162150, 0x2, 0x4ed55e0?)2023-07-27 09:05:00.773goroutine 4961128 [running]:2023-07-27 09:05:00.773 | 2023-07-27 09:05:00.773 | golang.org/x/[email protected]/errgroup/errgroup.go:72 +0xa5 | | | | 2023-07-27 09:05:00.773 | created by golang.org/x/sync/errgroup.(*Group).Go | | | | 2023-07-27 09:05:00.773 | golang.org/x/[email protected]/errgroup/errgroup.go:75 +0x64 | | | | 2023-07-27 09:05:00.773 | golang.org/x/sync/errgroup.(*Group).Go.func1() | | | | 2023-07-27 09:05:00.773 | github.com/grafana/pyroscope/pkg/frontend/frontend_select_merge_stacktraces.go:64 +0x21c | | | | 2023-07-27 09:05:00.773 | github.com/grafana/pyroscope/pkg/frontend.(*Frontend).SelectMergeStacktraces.func1() | | | | 2023-07-27 09:05:00.773 | github.com/grafana/pyroscope/pkg/model/flamegraph.go:199 +0x196 | | | | 2023-07-27 09:05:00.773 | github.com/grafana/pyroscope/pkg/model.(*FlameGraphMerger).MergeFlameGraph(0xc000459000, 0xc000162150) | | | | 2023-07-27 09:05:00.773 | github.com/grafana/pyroscope/pkg/model/flamegraph.go:240 +0x2db | | | | 2023-07-27 09:05:00.773 | github.com/grafana/pyroscope/pkg/model.buildStack({0xc0004e6900?, 0x180090?, 0xc0004e6900?}, 0xc000162150, 0x2, 0x4ed55e0?) | | | | 2023-07-27 09:05:00.773 | goroutine 4961128 [running]: | | | | 2023-07-27 09:05:00.773 | |
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2023-07-27 09:05:00.773 | golang.org/x/[email protected]/errgroup/errgroup.go:72 +0xa5 |
| | 2023-07-27 09:05:00.773 | created by golang.org/x/sync/errgroup.(*Group).Go |
| | 2023-07-27 09:05:00.773 | golang.org/x/[email protected]/errgroup/errgroup.go:75 +0x64 |
| | 2023-07-27 09:05:00.773 | golang.org/x/sync/errgroup.(*Group).Go.func1() |
| | 2023-07-27 09:05:00.773 | github.com/grafana/pyroscope/pkg/frontend/frontend_select_merge_stacktraces.go:64 +0x21c |
| | 2023-07-27 09:05:00.773 | github.com/grafana/pyroscope/pkg/frontend.(*Frontend).SelectMergeStacktraces.func1() |
| | 2023-07-27 09:05:00.773 | github.com/grafana/pyroscope/pkg/model/flamegraph.go:199 +0x196 |
| | 2023-07-27 09:05:00.773 | github.com/grafana/pyroscope/pkg/model.(*FlameGraphMerger).MergeFlameGraph(0xc000459000, 0xc000162150) |
| | 2023-07-27 09:05:00.773 | github.com/grafana/pyroscope/pkg/model/flamegraph.go:240 +0x2db |
| | 2023-07-27 09:05:00.773 | github.com/grafana/pyroscope/pkg/model.buildStack({0xc0004e6900?, 0x180090?, 0xc0004e6900?}, 0xc000162150, 0x2, 0x4ed55e0?) |
| | 2023-07-27 09:05:00.773 | goroutine 4961128 [running]: |
| | 2023-07-27 09:05:00.773 | |
2023-07-27 09:05:00.773panic: runtime error: index out of range [-1] | | | 2023-07-27 09:05:00.773 | panic: runtime error: index out of range [-1]
| | 2023-07-27 09:05:00.773 | panic: runtime error: index out of range [-1]
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