diff --git a/.gitignore b/.gitignore
index 9fc90c58..32f926a7 100644
--- a/.gitignore
+++ b/.gitignore
@@ -5,6 +5,7 @@ os/src/link_app.S
 os/src/linker.ld
 os/last-*
 os/Cargo.lock
+os/.gdb_history
 user/build
 user/target/*
 user/.idea/*
diff --git a/os/Cargo.toml b/os/Cargo.toml
index c98e71ef..cc93ff4e 100644
--- a/os/Cargo.toml
+++ b/os/Cargo.toml
@@ -14,3 +14,6 @@ cfg-if = { version = "1.0.0" }
 [features]
 board_qemu = []
 board_k210 = []
+
+[profile.release]
+debug = true
diff --git a/os/Makefile b/os/Makefile
index 505d37ec..6da9228f 100644
--- a/os/Makefile
+++ b/os/Makefile
@@ -11,6 +11,11 @@ SBI ?= rustsbi
 BOOTLOADER := ../bootloader/$(SBI)-$(BOARD).bin
 K210_BOOTLOADER_SIZE := 131072
 
+# Building mode argument
+ifeq ($(MODE), release)
+	MODE_ARG := --release
+endif
+
 # KERNEL ENTRY
 ifeq ($(BOARD), qemu)
 	KERNEL_ENTRY_PA := 0x80200000
@@ -51,7 +56,7 @@ kernel:
 	@cd ../user && make build
 	@echo Platform: $(BOARD)
 	@cp src/linker-$(BOARD).ld src/linker.ld
-	@cargo build --release --features "board_$(BOARD)"
+	@cargo build $(MODE_ARG) --features "board_$(BOARD)"
 	@rm src/linker.ld
 
 clean:
@@ -92,4 +97,10 @@ debug: build
 		tmux split-window -h "riscv64-unknown-elf-gdb -ex 'file $(KERNEL_ELF)' -ex 'set arch riscv:rv64' -ex 'target remote localhost:1234'" && \
 		tmux -2 attach-session -d
 
-.PHONY: build env kernel clean disasm disasm-vim run-inner switch-check
+gdbserver: build
+	@qemu-system-riscv64 -machine virt -nographic -bios $(BOOTLOADER) -device loader,file=$(KERNEL_BIN),addr=$(KERNEL_ENTRY_PA) -s -S
+
+gdbclient:
+	@riscv64-unknown-elf-gdb -ex 'file $(KERNEL_ELF)' -ex 'set arch riscv:rv64' -ex 'target remote localhost:1234'
+
+.PHONY: build env kernel clean disasm disasm-vim run-inner switch-check gdbserver gdbclient
diff --git a/rust-toolchain b/rust-toolchain
index 925656db..abcacd9b 100644
--- a/rust-toolchain
+++ b/rust-toolchain
@@ -1 +1 @@
-nightly-2022-01-19
+nightly-2022-04-11
diff --git a/user/Cargo.toml b/user/Cargo.toml
index 817ca525..d843673c 100644
--- a/user/Cargo.toml
+++ b/user/Cargo.toml
@@ -7,3 +7,6 @@ edition = "2018"
 # See more keys and their definitions at https://doc.rust-lang.org/cargo/reference/manifest.html
 
 [dependencies]
+
+[profile.release]
+debug = true