diff -Nru meanwhile-1.1.1/debian/changelog meanwhile-1.1.1/debian/changelog
--- meanwhile-1.1.1/debian/changelog	2021-01-14 04:41:25.000000000 +0000
+++ meanwhile-1.1.1/debian/changelog	2021-02-27 02:17:43.000000000 +0000
@@ -1,3 +1,11 @@
+meanwhile (1.1.1-2) unstable; urgency=high
+
+  * QA upload.
+  * Set optimization flag to "-O0 -fno-tree-vrp" to fix login issue
+    due to code optimization, similar with #815045. (Closes: #940621)
+
+ -- Boyuan Yang <byang@debian.org>  Fri, 26 Feb 2021 21:17:43 -0500
+
 meanwhile (1.1.1-1) unstable; urgency=medium
 
   * QA upload.
diff -Nru meanwhile-1.1.1/debian/rules meanwhile-1.1.1/debian/rules
--- meanwhile-1.1.1/debian/rules	2021-01-14 04:41:25.000000000 +0000
+++ meanwhile-1.1.1/debian/rules	2021-02-27 02:16:22.000000000 +0000
@@ -6,6 +6,10 @@
 include /usr/share/dpkg/default.mk
 include /usr/share/dpkg/architecture.mk
 
+# dirty workaround
+# https://bugs.debian.org/940621
+export DEB_CFLAGS_MAINT_APPEND=-O0 -fno-tree-vrp
+
 %:
 	dh $@