kv/kvnemesis: TestKVNemesisRangeFlush failed

kv/kvnemesis.TestKVNemesisRangeFlush [failed](https://mesolite.cluster.engflow.com/invocations/default/f6a30e6f-f185-406f-b3e7-4a2e2cbd6dfb?testReportRun=2&testReportShard=1&testReportAttempt=1#targets-Ly9wa2cva3Yva3ZuZW1lc2lzOmt2bmVtZXNpc190ZXN0) on master @ [b112dc518c826da8b4b577934d4ab5c0c24da045](https://github.com/cockroachdb/cockroach/commits/b112dc518c826da8b4b577934d4ab5c0c24da045):

```
=== RUN TestKVNemesisRangeFlush
test_log_scope.go:172: test logs captured to: outputs.zip/logTestKVNemesisRangeFlush31330368
test_log_scope.go:82: use -show-logs to present logs inline
kvnemesis_test.go:914: seed: 83315178612643042
kvnemesis_test.go:346: n1 using clock[offset=-123.277µs,amp=3.376723ms]
kvnemesis_test.go:346: n2 using clock[offset=296.87µs,amp=3.20313ms]
kvnemesis_test.go:346: n3 using clock[offset=103.397µs,amp=3.396603ms]
test_server_shim.go:146: using test tenant configuration from testserver factory defaults
kvnemesis_test.go:429: kvnemesis logging to /mnt/engflow/worker/work/0/exec/bazel-out/k8-fastbuild/testlogs/pkg/kv/kvnemesis/kvnemesis_test/run_2_of_10/test.outputs/kvnemesis3286149345
kvnemesis.go:241: error applying env.RSEngineController.RangeFlushForKey(tk(9973107197308248818)) // flushing SSTables during RangeFlush: pebble: compaction cancelled by a concurrent operation, will retry compaction: flushing SSTables during RangeFlush: pebble: compaction cancelled by a concurrent operation, will retry compaction
kvnemesis.go:282: failures(verbose): /mnt/engflow/worker/work/0/exec/bazel-out/k8-fastbuild/testlogs/pkg/kv/kvnemesis/kvnemesis_test/run_2_of_10/test.outputs/kvnemesis3286149345/failures
repro steps: /mnt/engflow/worker/work/0/exec/bazel-out/k8-fastbuild/testlogs/pkg/kv/kvnemesis/kvnemesis_test/run_2_of_10/test.outputs/kvnemesis3286149345/repro.go
rangefeed KVs: /mnt/engflow/worker/work/0/exec/bazel-out/k8-fastbuild/testlogs/pkg/kv/kvnemesis/kvnemesis_test/run_2_of_10/test.outputs/kvnemesis3286149345/kvs-rangefeed.txt
scan KVs: /mnt/engflow/worker/work/0/exec/bazel-out/k8-fastbuild/testlogs/pkg/kv/kvnemesis/kvnemesis_test/run_2_of_10/test.outputs/kvnemesis3286149345/kvs-scan.txt
kvnemesis_test.go:1102: Metric | Node 1 | Node 2 | Node 3
kvnemesis_test.go:1108: ------------------------------------+--------------------------------+--------------------------------+-------------------------------
kvnemesis_test.go:1115: follower_reads.success_count | 2 | 0 | 1
kvnemesis_test.go:1115: raft.commands.proposed | 2820 | 157 | 66
kvnemesis_test.go:1115: raft.commands.reproposed.new-lai | 3 | 1 | 0
kvnemesis_test.go:1115: raft.commands.reproposed.unchanged | 132 | 4 | 2
kvnemesis_test.go:1115: txn.aborts | 14 | 2 | 15
kvnemesis_test.go:1115: txn.commits | 614 | 110 | 109
kvnemesis_test.go:1115: txn.durations | μ=7ms p50=3ms p99=67ms | μ=4ms p50=2ms p99=55ms | μ=24ms p50=3ms p99=302ms
kvnemesis_test.go:1115: txn.restarts.writetooold | 2 | 0 | 0
kvnemesis_test.go:1115: txn.write_buffering.disabled_after_buffering | 0 | 0 | 0
kvnemesis_test.go:1115: distsender.rpc.err.writeintenterrtype | 1 | 0 | 3
kvnemesis_test.go:1115: txn.restarts.serializable | 1 | 0 | 0
kvnemesis_test.go:1115: txn.restarts.readwithinuncertainty | 0 | 0 | 0
kvnemesis_test.go:1115: txn.restarts.commitdeadlineexceeded | 0 | 0 | 0
kvnemesis_test.go:1115: txn.server_side.1PC.success | 56 | 0 | 0
kvnemesis_test.go:1115: txnrecovery.failures | 0 | 0 | 0
kvnemesis_test.go:1115: txnrecovery.successes.aborted | 0 | 0 | 0
kvnemesis_test.go:1115: txnrecovery.successes.committed | 0 | 0 | 0
kvnemesis_test.go:1115: txnwaitqueue.deadlocks_total | 0 | 0 | 0
kvnemesis_test.go:988:
Error Trace: pkg/kv/kvnemesis/kvnemesis_test.go:988
pkg/kv/kvnemesis/kvnemesis_test.go:893
Error: Should be zero, but was 1
Test: TestKVNemesisRangeFlush
Messages: kvnemesis detected failures
dump_raft_logs.go:32: dumping raft logs to /mnt/engflow/worker/work/0/exec/bazel-out/k8-fastbuild/testlogs/pkg/kv/kvnemesis/kvnemesis_test/run_2_of_10/test.outputs/kvnemesis3286149345/raftlogs
panic.go:694: -- test log scope end --
test logs left over in: outputs.zip/logTestKVNemesisRangeFlush31330368
--- FAIL: TestKVNemesisRangeFlush (22.68s)
```

Parameters:
- attempt=1
- run=2
- shard=1
Help

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

Same failure on other branches

- #175500 basalt-26.3.2-rc-20260908: kv/kvnemesis: TestKVNemesisRangeFlush failed [C-test-failure O-robot T-kv branch-basalt-26.3.2-rc-20260908 release-blocker]
- #175404 basalt-26.3.2-rc-20260913: kv/kvnemesis: TestKVNemesisRangeFlush failed [A-kv C-bug C-test-failure O-robot P-2 T-kv branch-basalt-26.3.2-rc-20260913]

/cc @cockroachlabs/kv-triage

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Jira issue: CRDB-68419