Sentry: cockroachkvs.go:327: runtime error: slice bounds out of range [:-41] (1) attached stack trace -- stack trace: | github.com/cockroachdb/pebble/cockroachkvs.Compare | external/com_github_...

This issue was auto filed by Sentry. It represents a crash or reported error on a live cluster with telemetry enabled.

Sentry Link: [https://cockroach-labs.sentry.io/issues/7333859824/?referrer=webhooks_plugin](https://cockroach-labs.sentry.io/issues/7333859824/?referrer=webhooks_plugin)

Panic Message:

```
cockroachkvs.go:327: runtime error: slice bounds out of range [:-41]
(1) attached stack trace
-- stack trace:
| github.com/cockroachdb/pebble/cockroachkvs.Compare
| external/com_github_cockroachdb_pebble/cockroachkvs/cockroachkvs.go:327
| github.com/cockroachdb/pebble/sstable.(*Writer).addRangeKeySpanToFragmenter
| external/com_github_cockroachdb_pebble/sstable/writer.go:252
| github.com/cockroachdb/pebble/sstable.(*Writer).RangeKeyDelete
| external/com_github_cockroachdb_pebble/sstable/writer.go:242
| github.com/cockroachdb/pebble/tool.(*dbT).runExcise
| external/com_github_cockroachdb_pebble/tool/db.go:756
| github.com/spf13/cobra.(*Command).execute
| external/com_github_spf13_cobra/command.go:920
| github.com/spf13/cobra.(*Command).ExecuteC
| external/com_github_spf13_cobra/command.go:1044
| github.com/spf13/cobra.(*Command).Execute
| external/com_github_spf13_cobra/command.go:968
| github.com/cockroachdb/cockroach/pkg/cli.Run
| cli.go:301
| github.com/cockroachdb/cockroach/pkg/cli.doMain
| cli.go:140
| github.com/cockroachdb/cockroach/pkg/cli.Main
| cli.go:65
| main.main
| pkg/cmd/cockroach/main.go:21
| runtime.main
| GOROOT/src/runtime/proc.go:285
| runtime.goexit
| src/runtime/asm_amd64.s:1693
Wraps: (2) runtime error: slice bounds out of range [:-41]
Error types: (1) *withstack.withStack (2) runtime.boundsError
-- report composition:
runtime.boundsError
cockroachkvs.go:327: *withstack.withStack (top exception)
```

Stacktrace (expand for inline code snippets):

[src/runtime/asm_amd64.s#L1692-L1694](src/runtime/asm_amd64.s#L1692-L1694)
[GOROOT/src/runtime/proc.go#L284-L286](GOROOT/src/runtime/proc.go#L284-L286)
[pkg/cmd/cockroach/main.go#L20-L22](pkg/cmd/cockroach/main.go#L20-L22)
[cli.go#L64-L66](cli.go#L64-L66)
[cli.go#L139-L141](cli.go#L139-L141)
[cli.go#L300-L302](cli.go#L300-L302)
[external/com_github_spf13_cobra/command.go#L967-L969](external/com_github_spf13_cobra/command.go#L967-L969)
[external/com_github_spf13_cobra/command.go#L1043-L1045](external/com_github_spf13_cobra/command.go#L1043-L1045)
[external/com_github_spf13_cobra/command.go#L919-L921](external/com_github_spf13_cobra/command.go#L919-L921)
[external/com_github_cockroachdb_pebble/tool/db.go#L755-L757](external/com_github_cockroachdb_pebble/tool/db.go#L755-L757)
[external/com_github_cockroachdb_pebble/sstable/writer.go#L241-L243](external/com_github_cockroachdb_pebble/sstable/writer.go#L241-L243)
[external/com_github_cockroachdb_pebble/sstable/writer.go#L251-L253](external/com_github_cockroachdb_pebble/sstable/writer.go#L251-L253)
[external/com_github_cockroachdb_pebble/cockroachkvs/cockroachkvs.go#L326-L328](external/com_github_cockroachdb_pebble/cockroachkvs/cockroachkvs.go#L326-L328)

```
src/runtime/asm_amd64.s in runtime.goexit at line 1693
GOROOT/src/runtime/proc.go in runtime.main at line 285
pkg/cmd/cockroach/main.go in main.main at line 21
cli.go in pkg/cli.Main at line 65
cli.go in pkg/cli.doMain at line 140
cli.go in pkg/cli.Run at line 301
external/com_github_spf13_cobra/command.go in github.com/spf13/cobra.(*Command).Execute at line 968
external/com_github_spf13_cobra/command.go in github.com/spf13/cobra.(*Command).ExecuteC at line 1044
external/com_github_spf13_cobra/command.go in github.com/spf13/cobra.(*Command).execute at line 920
external/com_github_cockroachdb_pebble/tool/db.go in github.com/cockroachdb/pebble/tool.(*dbT).runExcise at line 756
external/com_github_cockroachdb_pebble/sstable/writer.go in github.com/cockroachdb/pebble/sstable.(*Writer).RangeKeyDelete at line 242
external/com_github_cockroachdb_pebble/sstable/writer.go in github.com/cockroachdb/pebble/sstable.(*Writer).addRangeKeySpanToFragmenter at line 252
external/com_github_cockroachdb_pebble/cockroachkvs/cockroachkvs.go in github.com/cockroachdb/pebble/cockroachkvs.Compare at line 327
```

### Tags

| Tag | Value |
| --- | --- |
| Command | debug pebble db excise |
| Environment | v26.1.0 |
| Go Version | go1.25.5 |
| Platform | linux amd64 |
| Distribution | CCL |
| Cockroach Release | v26.1.0 |
| Cockroach SHA | 434ba3ce6e0dd21f65dac8fd33d945c3f10986fc |
| # of CPUs | 12 |
| # of Goroutines | 10 |

Jira issue: CRDB-61560