diff --git a/cpu/atmega_common/include/cpu_conf.h b/cpu/atmega_common/include/cpu_conf.h
index bd00d7e278..e97dd2fb0d 100644
--- a/cpu/atmega_common/include/cpu_conf.h
+++ b/cpu/atmega_common/include/cpu_conf.h
@@ -49,8 +49,16 @@ extern "C" {
  * to avoid not printing of debug in interrupts
  */
 #ifndef THREAD_STACKSIZE_IDLE
+#ifdef MODULE_XTIMER
+/* xtimer's 64 bit arithmetic doesn't perform well on 8 bit archs. In order to
+ * prevent a stack overflow when an timer triggers while the idle thread is
+ * running, we have to increase the stack size then
+ */
+#define THREAD_STACKSIZE_IDLE      (192)
+#else
 #define THREAD_STACKSIZE_IDLE      (128)
 #endif
+#endif
 /** @} */
 
 /**
diff --git a/examples/gnrc_lorawan/Makefile.ci b/examples/gnrc_lorawan/Makefile.ci
index 6132e54c84..6eb1254152 100644
--- a/examples/gnrc_lorawan/Makefile.ci
+++ b/examples/gnrc_lorawan/Makefile.ci
@@ -5,14 +5,14 @@ BOARD_INSUFFICIENT_MEMORY := \
     arduino-nano \
     arduino-uno \
     atmega328p \
+    msb-430 \
+    msb-430h \
     nucleo-f031k6 \
     nucleo-f042k6 \
     nucleo-l031k6 \
     stm32f030f4-demo \
     stm32f0discovery \
-    msb-430 \
-    msb-430h \
     telosb \
     waspmote-pro \
     z1 \
-#
+    #
diff --git a/tests/bench_msg_pingpong/Makefile.ci b/tests/bench_msg_pingpong/Makefile.ci
index da2429a326..8a0aef2b9e 100644
--- a/tests/bench_msg_pingpong/Makefile.ci
+++ b/tests/bench_msg_pingpong/Makefile.ci
@@ -1,4 +1,8 @@
 BOARD_INSUFFICIENT_MEMORY := \
+    arduino-duemilanove \
+    arduino-nano \
+    arduino-uno \
+    atmega328p \
     nucleo-f031k6 \
     stm32f030f4-demo \
     #
diff --git a/tests/bench_mutex_pingpong/Makefile.ci b/tests/bench_mutex_pingpong/Makefile.ci
index da2429a326..8a0aef2b9e 100644
--- a/tests/bench_mutex_pingpong/Makefile.ci
+++ b/tests/bench_mutex_pingpong/Makefile.ci
@@ -1,4 +1,8 @@
 BOARD_INSUFFICIENT_MEMORY := \
+    arduino-duemilanove \
+    arduino-nano \
+    arduino-uno \
+    atmega328p \
     nucleo-f031k6 \
     stm32f030f4-demo \
     #
diff --git a/tests/bench_sys_base64/Makefile.ci b/tests/bench_sys_base64/Makefile.ci
new file mode 100644
index 0000000000..998fbf0184
--- /dev/null
+++ b/tests/bench_sys_base64/Makefile.ci
@@ -0,0 +1,6 @@
+BOARD_INSUFFICIENT_MEMORY := \
+    arduino-duemilanove \
+    arduino-nano \
+    arduino-uno \
+    atmega328p \
+    #
diff --git a/tests/bench_thread_flags_pingpong/Makefile.ci b/tests/bench_thread_flags_pingpong/Makefile.ci
index da2429a326..8a0aef2b9e 100644
--- a/tests/bench_thread_flags_pingpong/Makefile.ci
+++ b/tests/bench_thread_flags_pingpong/Makefile.ci
@@ -1,4 +1,8 @@
 BOARD_INSUFFICIENT_MEMORY := \
+    arduino-duemilanove \
+    arduino-nano \
+    arduino-uno \
+    atmega328p \
     nucleo-f031k6 \
     stm32f030f4-demo \
     #
diff --git a/tests/bench_thread_yield_pingpong/Makefile.ci b/tests/bench_thread_yield_pingpong/Makefile.ci
index da2429a326..8a0aef2b9e 100644
--- a/tests/bench_thread_yield_pingpong/Makefile.ci
+++ b/tests/bench_thread_yield_pingpong/Makefile.ci
@@ -1,4 +1,8 @@
 BOARD_INSUFFICIENT_MEMORY := \
+    arduino-duemilanove \
+    arduino-nano \
+    arduino-uno \
+    atmega328p \
     nucleo-f031k6 \
     stm32f030f4-demo \
     #
diff --git a/tests/bench_xtimer/Makefile.ci b/tests/bench_xtimer/Makefile.ci
index 5041b642e0..91e4c1887d 100644
--- a/tests/bench_xtimer/Makefile.ci
+++ b/tests/bench_xtimer/Makefile.ci
@@ -1,4 +1,8 @@
 BOARD_INSUFFICIENT_MEMORY := \
+    arduino-duemilanove \
+    arduino-nano \
+    arduino-uno \
+    atmega328p \
     im880b \
     olimexino-stm32 \
     #
diff --git a/tests/driver_at24cxxx/Makefile.ci b/tests/driver_at24cxxx/Makefile.ci
new file mode 100644
index 0000000000..998fbf0184
--- /dev/null
+++ b/tests/driver_at24cxxx/Makefile.ci
@@ -0,0 +1,6 @@
+BOARD_INSUFFICIENT_MEMORY := \
+    arduino-duemilanove \
+    arduino-nano \
+    arduino-uno \
+    atmega328p \
+    #
diff --git a/tests/driver_atwinc15x0/Makefile.ci b/tests/driver_atwinc15x0/Makefile.ci
index 9b96db78df..abab66dd5d 100644
--- a/tests/driver_atwinc15x0/Makefile.ci
+++ b/tests/driver_atwinc15x0/Makefile.ci
@@ -2,8 +2,8 @@ BOARD_INSUFFICIENT_MEMORY := \
     arduino-duemilanove \
     arduino-leonardo \
     arduino-mega2560 \
-    arduino-uno \
     arduino-nano \
+    arduino-uno \
     atmega328p \
     i-nucleo-lrwan1 \
     msb-430 \
diff --git a/tests/driver_ds1307/Makefile.ci b/tests/driver_ds1307/Makefile.ci
new file mode 100644
index 0000000000..998fbf0184
--- /dev/null
+++ b/tests/driver_ds1307/Makefile.ci
@@ -0,0 +1,6 @@
+BOARD_INSUFFICIENT_MEMORY := \
+    arduino-duemilanove \
+    arduino-nano \
+    arduino-uno \
+    atmega328p \
+    #
diff --git a/tests/driver_sps30/Makefile.ci b/tests/driver_sps30/Makefile.ci
new file mode 100644
index 0000000000..998fbf0184
--- /dev/null
+++ b/tests/driver_sps30/Makefile.ci
@@ -0,0 +1,6 @@
+BOARD_INSUFFICIENT_MEMORY := \
+    arduino-duemilanove \
+    arduino-nano \
+    arduino-uno \
+    atmega328p \
+    #
diff --git a/tests/emcute/Makefile.ci b/tests/emcute/Makefile.ci
index 62c51016f5..e86556544e 100644
--- a/tests/emcute/Makefile.ci
+++ b/tests/emcute/Makefile.ci
@@ -8,10 +8,10 @@ BOARD_INSUFFICIENT_MEMORY := \
     atmega1284p \
     atmega328p \
     b-l072z-lrwan1 \
-    blackpill-128kib \
     blackpill \
-    bluepill-128kib \
+    blackpill-128kib \
     bluepill \
+    bluepill-128kib \
     calliope-mini \
     cc2650-launchpad \
     cc2650stk \
diff --git a/tests/gnrc_dhcpv6_client_6lbr/Makefile.ci b/tests/gnrc_dhcpv6_client_6lbr/Makefile.ci
index 9306585319..7e308b3177 100644
--- a/tests/gnrc_dhcpv6_client_6lbr/Makefile.ci
+++ b/tests/gnrc_dhcpv6_client_6lbr/Makefile.ci
@@ -8,10 +8,10 @@ BOARD_INSUFFICIENT_MEMORY := \
     atmega1284p \
     atmega328p \
     b-l072z-lrwan1 \
-    blackpill-128kib \
     blackpill \
-    bluepill-128kib \
+    blackpill-128kib \
     bluepill \
+    bluepill-128kib \
     calliope-mini \
     cc2650-launchpad \
     cc2650stk \
diff --git a/tests/gnrc_ipv6_ext/Makefile.ci b/tests/gnrc_ipv6_ext/Makefile.ci
index 6b1a633a7a..0e3b1c77a8 100644
--- a/tests/gnrc_ipv6_ext/Makefile.ci
+++ b/tests/gnrc_ipv6_ext/Makefile.ci
@@ -9,8 +9,8 @@ BOARD_INSUFFICIENT_MEMORY := \
     derfmega128 \
     hifive1 \
     hifive1b \
-    im880b \
     i-nucleo-lrwan1 \
+    im880b \
     mega-xplained \
     microduino-corerf \
     msb-430 \
diff --git a/tests/msg_try_receive/Makefile.ci b/tests/msg_try_receive/Makefile.ci
index da2429a326..8a0aef2b9e 100644
--- a/tests/msg_try_receive/Makefile.ci
+++ b/tests/msg_try_receive/Makefile.ci
@@ -1,4 +1,8 @@
 BOARD_INSUFFICIENT_MEMORY := \
+    arduino-duemilanove \
+    arduino-nano \
+    arduino-uno \
+    atmega328p \
     nucleo-f031k6 \
     stm32f030f4-demo \
     #
diff --git a/tests/periph_wdt/Makefile.ci b/tests/periph_wdt/Makefile.ci
new file mode 100644
index 0000000000..998fbf0184
--- /dev/null
+++ b/tests/periph_wdt/Makefile.ci
@@ -0,0 +1,6 @@
+BOARD_INSUFFICIENT_MEMORY := \
+    arduino-duemilanove \
+    arduino-nano \
+    arduino-uno \
+    atmega328p \
+    #
diff --git a/tests/pkg_littlefs2/Makefile.ci b/tests/pkg_littlefs2/Makefile.ci
index 6726f1d2b6..45ff173186 100644
--- a/tests/pkg_littlefs2/Makefile.ci
+++ b/tests/pkg_littlefs2/Makefile.ci
@@ -5,12 +5,12 @@ BOARD_INSUFFICIENT_MEMORY := \
     arduino-uno \
     atmega328p \
     i-nucleo-lrwan1 \
+    nucleo-f030r8 \
     nucleo-f031k6 \
     nucleo-f042k6 \
     nucleo-l031k6 \
     nucleo-l053r8 \
-    nucleo-f030r8 \
-    stm32f030f4-demo\
+    stm32f030f4-demo \
     stm32f0discovery \
     stm32l0538-disco \
     waspmote-pro \
diff --git a/tests/thread_msg_block_w_queue/Makefile.ci b/tests/thread_msg_block_w_queue/Makefile.ci
index da2429a326..8a0aef2b9e 100644
--- a/tests/thread_msg_block_w_queue/Makefile.ci
+++ b/tests/thread_msg_block_w_queue/Makefile.ci
@@ -1,4 +1,8 @@
 BOARD_INSUFFICIENT_MEMORY := \
+    arduino-duemilanove \
+    arduino-nano \
+    arduino-uno \
+    atmega328p \
     nucleo-f031k6 \
     stm32f030f4-demo \
     #
diff --git a/tests/thread_msg_block_wo_queue/Makefile.ci b/tests/thread_msg_block_wo_queue/Makefile.ci
index da2429a326..8a0aef2b9e 100644
--- a/tests/thread_msg_block_wo_queue/Makefile.ci
+++ b/tests/thread_msg_block_wo_queue/Makefile.ci
@@ -1,4 +1,8 @@
 BOARD_INSUFFICIENT_MEMORY := \
+    arduino-duemilanove \
+    arduino-nano \
+    arduino-uno \
+    atmega328p \
     nucleo-f031k6 \
     stm32f030f4-demo \
     #
diff --git a/tests/thread_zombie/Makefile.ci b/tests/thread_zombie/Makefile.ci
index af61efb31c..3585ad2b49 100644
--- a/tests/thread_zombie/Makefile.ci
+++ b/tests/thread_zombie/Makefile.ci
@@ -5,5 +5,5 @@ BOARD_INSUFFICIENT_MEMORY := \
     arduino-uno \
     atmega328p \
     nucleo-f031k6 \
-    stm32f030f4-demo
+    stm32f030f4-demo \
     #
diff --git a/tests/usbus/Makefile.ci b/tests/usbus/Makefile.ci
index 518b330a9e..437811ffa9 100644
--- a/tests/usbus/Makefile.ci
+++ b/tests/usbus/Makefile.ci
@@ -1,3 +1,7 @@
 BOARD_INSUFFICIENT_MEMORY := \
+    arduino-duemilanove \
+    arduino-nano \
+    arduino-uno \
+    atmega328p \
     stm32f030f4-demo \
     #
diff --git a/tests/xtimer_rmutex_lock_timeout/Makefile.ci b/tests/xtimer_rmutex_lock_timeout/Makefile.ci
new file mode 100644
index 0000000000..998fbf0184
--- /dev/null
+++ b/tests/xtimer_rmutex_lock_timeout/Makefile.ci
@@ -0,0 +1,6 @@
+BOARD_INSUFFICIENT_MEMORY := \
+    arduino-duemilanove \
+    arduino-nano \
+    arduino-uno \
+    atmega328p \
+    #