diff --git a/bench.mk b/bench.mk
index dfe46bdb2aa9b1ccfc7cf2a5816bf629098d4f75..28c87419191ddbc5bcf503ed398f1a7155eaab8b 100644
--- a/bench.mk
+++ b/bench.mk
@@ -45,9 +45,9 @@ bench-set: $(binaries-benchset)
 
 bench-malloc: $(binaries-bench-malloc)
 	run=$(objpfx)bench-malloc-thread; \
-	outfile=$(prefix)/$$(basename $${run}.$(ver).out); \
 	for thr in 1 8 16 32; do \
 	  echo "Running $${run} $${thr}"; \
+	  outfile=$(prefix)/$$(basename $${run}-$${thr}.$(ver).out); \
 	  $(run-bench) $${thr} > $${outfile}.tmp; \
 	  mv $${outfile}{.tmp,}; \
 	done
diff --git a/glibc.spec b/glibc.spec
index e80a59c3eb72dd07576e4972a80852d8f163f979..1295e7232516e5d8df7b0f9de19f2ca17666f06e 100644
--- a/glibc.spec
+++ b/glibc.spec
@@ -67,7 +67,7 @@
 ##############################################################################
 Name: 	 	glibc
 Version: 	2.38
-Release: 	78
+Release: 	79
 Summary: 	The GNU libc libraries
 License:	%{all_license}
 URL: 		http://www.gnu.org/software/glibc/
@@ -1602,6 +1602,9 @@ fi
 %endif
 
 %changelog
+* Wed Nov 19 2025 panzhe <panzhe@kylinos.cn> - 2.38-79
+- benchtest: Fixed benchtest result file overwriting 
+
 * Thu Nov 13 2025 Jiamei Xie <xiejiamei@hygon.cn> - 2.38-78
 - Backport patch from master branch
 - Set Prefer_No_AVX512 flag for hygon platform