Failing test related to AOF rewrite buffers

tests/integration/aof-race.tcl

@@ -0,0 +1,35 @@
+set defaults { appendonly {yes} appendfilename {appendonly.aof} }
+set server_path [tmpdir server.aof]
+set aof_path "$server_path/appendonly.aof"
+
+proc start_server_aof {overrides code} {
+    upvar defaults defaults srv srv server_path server_path
+    set config [concat $defaults $overrides]
+    start_server [list overrides $config] $code
+}
+
+tags {"aof"} {
+    # Specific test for a regression where internal buffers were not properly
+    # cleaned after a child responsible for an AOF rewrite exited. This buffer
+    # was subsequently appended to the new AOF, resulting in duplicate commands.
+    start_server_aof [list dir $server_path] {
+        set client [redis [srv host] [srv port]]
+        set bench [open "|src/redis-benchmark -q -p [srv port] -c 20 -n 20000 incr foo" "r+"]
+        after 100
+
+        # Benchmark should be running by now: start background rewrite
+        $client bgrewriteaof
+
+        # Read until benchmark pipe reaches EOF
+        while {[string length [read $bench]] > 0} {}
+
+        # Check contents of foo
+        assert_equal 20000 [$client get foo]
+    }
+
+    # Restart server to replay AOF
+    start_server_aof [list dir $server_path] {
+        set client [redis [srv host] [srv port]]
+        assert_equal 20000 [$client get foo]
+    }
+}

tests/test_helper.tcl

@@ -29,6 +29,7 @@ set ::all_tests {
     integration/replication-2
     integration/replication-3
     integration/aof
+    integration/aof-race
     unit/pubsub
     unit/slowlog
     unit/scripting