diff --git a/ci/uconv_reproduce/ci-uconv-reproduce.sh b/ci/uconv_reproduce/ci-uconv-reproduce.sh
index 0ceb3258..abe67d4a 100644
--- a/ci/uconv_reproduce/ci-uconv-reproduce.sh
+++ b/ci/uconv_reproduce/ci-uconv-reproduce.sh
@@ -1,5 +1,7 @@
 #!/bin/bash
 
+apt install -y python3
+
 convertor="/opt/overlaybd/snapshotter/convertor"
 images=("centos:centos7.9.2009" "ubuntu:22.04" "redis:7.2.3" "wordpress:6.4.2" "nginx:1.25.3")
 repo="registry.hub.docker.com/overlaybd"
@@ -29,7 +31,8 @@ do
     for file in ${files[@]}
     do
         fn="${file}.json"
-        diff ${tmp_dir}/${fn} ${ci_base}/${img}/${fn}
+        # diff ${tmp_dir}/${fn} ${ci_base}/${img}/${fn}
+        python3 compare_layers.py ${file} ${tmp_dir}/${fn} ${ci_base}/${img}/${fn}
         ret=$?
         if [[ ${ret} -eq 0 ]]; then
             echo "${prefix} ${img} ${file} consistent"
diff --git a/ci/uconv_reproduce/compare_layers.py b/ci/uconv_reproduce/compare_layers.py
new file mode 100644
index 00000000..29c04388
--- /dev/null
+++ b/ci/uconv_reproduce/compare_layers.py
@@ -0,0 +1,67 @@
+import os, sys
+import json
+
+
+def compare_manifest(fa_conf, fb_conf):
+    fa_layers = fa_conf["layers"]
+    fb_layers = fb_conf["layers"]
+    if len(fa_layers) != len(fb_layers):
+        print("layer size diff: %d %d" % (len(fa_layers), len(fb_layers)))
+        return -1
+    ret = 0
+    for idx in range(0, len(fa_layers)):
+        has_diff = 0
+        if fa_layers[idx]["digest"] != fb_layers[idx]["digest"]:
+            print("layer %d digest diff: %s %s" % (idx, fa_layers[idx]["digest"], fb_layers[idx]["digest"]))
+            has_diff = -1
+        if fa_layers[idx]["size"] != fb_layers[idx]["size"]:
+            print("layer %d size diff: %s %s" % (idx, fa_layers[idx]["size"], fb_layers[idx]["size"]))
+            has_diff = -1
+        if has_diff == 0:
+            print("layer %d consistent" % idx)
+        else:
+            ret = -1
+    return ret
+
+
+def compare_config(fa_conf, fb_conf):
+    fa_diffs = fa_conf["rootfs"]["diff_ids"]
+    fb_diffs = fb_conf["rootfs"]["diff_ids"]
+    if len(fa_diffs) != len(fb_diffs):
+        print("diff_ids size diff: %d %d" % (len(fa_diffs), len(fb_diffs)))
+        return -1
+    ret = 0
+    for idx in range(0, len(fa_diffs)):
+        if fa_diffs[idx] != fb_diffs[idx]:
+            print("diff_ids %d diff: %s %s" % (idx, fa_diffs[idx], fb_diffs[idx]))
+            ret = -1
+        else:
+            print("diff_ids %d consistent" % idx)
+    return ret
+
+
+def main():
+    if len(sys.argv) < 4:
+        print("Usage: python3 %s <type> <fa> <fb>" % os.path.basename(sys.argv[0]))
+    ftype = sys.argv[1]
+    fa = sys.argv[2]
+    fb = sys.argv[3]
+    if not os.path.exists(fa):
+        print("file %s not exist" % fa)
+        return -1
+    if not os.path.exists(fb):
+        print("file %s not exist" % fb)
+        return -1
+    fa_conf = json.load(open(fa, 'r'))
+    fb_conf = json.load(open(fb, 'r'))
+    if ftype == "manifest":
+        sys.exit(compare_manifest(fa_conf, fb_conf))
+    elif ftype == "config":
+        sys.exit(compare_config(fa_conf, fb_conf))
+    else:
+        print("unknown type %s" % ftype)
+        sys.exit(-1)
+
+
+if __name__ == '__main__':
+    main()
diff --git a/cmd/ctr/main.go b/cmd/ctr/main.go
index 6071c2d1..1735b6df 100644
--- a/cmd/ctr/main.go
+++ b/cmd/ctr/main.go
@@ -18,15 +18,16 @@ package main
 
 import (
 	"fmt"
+	"math/rand"
 	"os"
+	"time"
 
 	"github.com/containerd/containerd/cmd/ctr/app"
-	"github.com/containerd/containerd/pkg/seed"
 	"github.com/urfave/cli"
 )
 
 func init() {
-	seed.WithTimeAndRand()
+	rand.Seed(time.Now().UnixNano())
 }
 
 var pluginCmds = []cli.Command{