https://bugs.gentoo.org/932251
https://github.com/mongodb/mongo/commit/f8e4be7f6da71f978b2aa9991febb4c7ad89c903#diff-010644a9158d28e5745762753c7ce454444c9fb9ab4c684e9f2fdcff50c6f539
https://bugs.gentoo.org/932251#c3

--- a/src/mongo/db/initialize_server_global_state.cpp
+++ b/src/mongo/db/initialize_server_global_state.cpp
@@ -328,7 +328,7 @@
                                         << "\" should name a file, not a directory.");
             }
 
-            if (!serverGlobalParams.logAppend && boost::filesystem::is_regular(absoluteLogpath)) {
+            if (!serverGlobalParams.logAppend && boost::filesystem::is_regular_file(absoluteLogpath)) {
                 std::string renameTarget = absoluteLogpath + "." + terseCurrentTimeForFilename();
                 boost::system::error_code ec;
                 boost::filesystem::rename(absoluteLogpath, renameTarget, ec);