basalt-26.3.2-rc-20260908: sql: TestDistributedMergeStoragePrefixPreservedAcrossPauseResume failed

sql.TestDistributedMergeStoragePrefixPreservedAcrossPauseResume [failed](https://mesolite.cluster.engflow.com/invocations/default/154a6740-7ddc-4b24-b932-f3322ce63402?testReportRun=2&testReportShard=14&testReportAttempt=1#targets-Ly9wa2cvc3FsOnNxbF90ZXN0) on basalt-26.3.2-rc-20260908 @ [807558e5e81666af257c811e925e4cae570abc28](https://github.com/cockroachdb/cockroach/commits/807558e5e81666af257c811e925e4cae570abc28):

```
=== RUN TestDistributedMergeStoragePrefixPreservedAcrossPauseResume
test_log_scope.go:172: test logs captured to: outputs.zip/logTestDistributedMergeStoragePrefixPreservedAcrossPauseResume2468943637
test_log_scope.go:82: use -show-logs to present logs inline
test_server_shim.go:168: automatically injected a shared process virtual cluster under test; see comment at top of test_server_shim.go for details.
test_server_shim.go:639: DRPC is enabled (via testserver factory defaults)
indexbackfiller_test.go:1087: storage prefixes before pause: [nodelocal://1/]
indexbackfiller_test.go:1090: condition failed to evaluate within 30s: from indexbackfiller_test.go:1094: expected succeeded, got running

goroutine dump: /mnt/engflow/worker/work/0/exec/bazel-out/k8-fastbuild/testlogs/pkg/sql/sql_test/shard_14_of_16_run_2_of_3/test.outputs/goroutine_dump_3920410466.txt
panic.go:694: -- test log scope end --
test logs left over in: outputs.zip/logTestDistributedMergeStoragePrefixPreservedAcrossPauseResume2468943637
--- FAIL: TestDistributedMergeStoragePrefixPreservedAcrossPauseResume (48.57s)
```

Parameters:
- attempt=1
- race=true
- run=2
- shard=14
Help

See also: [How To Investigate a Go Test Failure \(internal\)](https://cockroachlabs.atlassian.net/l/c/HgfXfJgM)

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Start by reproducing sql.TestDistributedMergeStoragePrefixPreservedAcrossPauseResume and inspect pkg/sql/indexbackfiller_test.go around lines 1087-1094. Run it with -show-logs and review the captured test logs and goroutine dump for why the condition remains running after pause/resume. Done means the test completes successfully and preserves the storage prefix across the pause/resume sequence.

Written by the indexing model from the issue text.