diff --git a/.github/workflows/test-sync.yml b/.github/workflows/test-sync.yml
index 5f7b035..9ad696a 100644
--- a/.github/workflows/test-sync.yml
+++ b/.github/workflows/test-sync.yml
@@ -30,7 +30,7 @@ jobs:
     - name: Build libcurl
       run: |
         cd external/src/curl
-        cmake . -DCMAKE_C_COMPILER=gcc-12 -DCMAKE_C_FLAGS='-fsanitize=thread -Os -fno-omit-frame-pointer -g' -DBUILD_CURL_EXE=OFF -DBUILD_SHARED_LIBS=OFF -DCURL_ZLIB=OFF -DCURL_DISABLE_ALTSVC=ON -DCURL_DISABLE_COOKIES=ON -DCURL_DISABLE_DOH=ON -DCURL_DISABLE_GETOPTIONS=ON -DCURL_DISABLE_HSTS=ON -DCURL_DISABLE_LIBCURL_OPTION=ON -DCURL_DISABLE_MIME=ON -DCURL_DISABLE_NETRC=ON -DCURL_DISABLE_NTLM=ON -DCURL_DISABLE_PARSEDATE=ON -DCURL_DISABLE_PROGRESS_METER=ON -DCURL_DISABLE_SHUFFLE_DNS=ON -DCURL_DISABLE_SOCKETPAIR=ON -DCURL_DISABLE_VERBOSE_STRINGS=ON -DHTTP_ONLY=ON -DCURL_ENABLE_SSL=OFF -DUSE_LIBIDN2=OFF -DCURL_USE_LIBPSL=OFF -DCURL_USE_LIBSSH2=OFF -DENABLE_UNIX_SOCKETS=OFF
+        cmake . -DCMAKE_C_COMPILER=gcc-12 -DCMAKE_C_FLAGS='-fsanitize=thread -Og -fno-omit-frame-pointer -g' -DBUILD_CURL_EXE=OFF -DBUILD_SHARED_LIBS=OFF -DCURL_ZLIB=OFF -DCURL_DISABLE_ALTSVC=ON -DCURL_DISABLE_COOKIES=ON -DCURL_DISABLE_DOH=ON -DCURL_DISABLE_GETOPTIONS=ON -DCURL_DISABLE_HSTS=ON -DCURL_DISABLE_LIBCURL_OPTION=ON -DCURL_DISABLE_MIME=ON -DCURL_DISABLE_NETRC=ON -DCURL_DISABLE_NTLM=ON -DCURL_DISABLE_PARSEDATE=ON -DCURL_DISABLE_PROGRESS_METER=ON -DCURL_DISABLE_SHUFFLE_DNS=ON -DCURL_DISABLE_SOCKETPAIR=ON -DCURL_DISABLE_VERBOSE_STRINGS=ON -DHTTP_ONLY=ON -DCURL_ENABLE_SSL=OFF -DUSE_LIBIDN2=OFF -DCURL_USE_LIBPSL=OFF -DCURL_USE_LIBSSH2=OFF -DENABLE_UNIX_SOCKETS=OFF
         make -j$(nproc)
         cd lib && mkdir .libs && cp libcurl.a .libs
 
@@ -39,7 +39,7 @@ jobs:
         cd external/src/libuv
         mkdir build
         cd build
-        cmake .. -DCMAKE_C_COMPILER=gcc-12 -DCMAKE_C_FLAGS='-fsanitize=thread -Os -fno-omit-frame-pointer -g' -DBUILD_TESTING=OFF -DLIBUV_BUILD_SHARED=OFF
+        cmake .. -DCMAKE_C_COMPILER=gcc-12 -DCMAKE_C_FLAGS='-fsanitize=thread -Og -fno-omit-frame-pointer -g' -DBUILD_TESTING=OFF -DLIBUV_BUILD_SHARED=OFF
         make -j$(nproc)
 
     - name: Build libzmq
@@ -47,7 +47,7 @@ jobs:
         cd external/src/libzmq
         mkdir build
         cd build
-        cmake .. -DCMAKE_C_COMPILER=gcc-12 -DCMAKE_CXX_COMPILER=g++-12 -DCMAKE_C_FLAGS='-fsanitize=thread -Os -fno-omit-frame-pointer -g' -DCMAKE_CXX_FLAGS='-fsanitize=thread -Os -fno-omit-frame-pointer -g' -DWITH_LIBSODIUM=OFF -DWITH_LIBBSD=OFF -DBUILD_TESTS=OFF -DWITH_DOCS=OFF -DENABLE_DRAFTS=OFF -DBUILD_SHARED=OFF
+        cmake .. -DCMAKE_C_COMPILER=gcc-12 -DCMAKE_CXX_COMPILER=g++-12 -DCMAKE_C_FLAGS='-fsanitize=thread -Og -fno-omit-frame-pointer -g' -DCMAKE_CXX_FLAGS='-fsanitize=thread -Og -fno-omit-frame-pointer -g' -DWITH_LIBSODIUM=OFF -DWITH_LIBBSD=OFF -DBUILD_TESTS=OFF -DWITH_DOCS=OFF -DENABLE_DRAFTS=OFF -DBUILD_SHARED=OFF
         make -j$(nproc)
 
     - name: Build p2pool
@@ -118,7 +118,7 @@ jobs:
     - name: Build libcurl
       run: |
         cd external/src/curl
-        cmake . -DCMAKE_C_COMPILER=clang-17 -DCMAKE_C_FLAGS='-fsanitize=memory -fsanitize-recover -fsanitize-memory-track-origins -Os -fno-omit-frame-pointer -g' -DBUILD_CURL_EXE=OFF -DBUILD_SHARED_LIBS=OFF -DCURL_ZLIB=OFF -DCURL_DISABLE_ALTSVC=ON -DCURL_DISABLE_COOKIES=ON -DCURL_DISABLE_DOH=ON -DCURL_DISABLE_GETOPTIONS=ON -DCURL_DISABLE_HSTS=ON -DCURL_DISABLE_LIBCURL_OPTION=ON -DCURL_DISABLE_MIME=ON -DCURL_DISABLE_NETRC=ON -DCURL_DISABLE_NTLM=ON -DCURL_DISABLE_PARSEDATE=ON -DCURL_DISABLE_PROGRESS_METER=ON -DCURL_DISABLE_SHUFFLE_DNS=ON -DCURL_DISABLE_SOCKETPAIR=ON -DCURL_DISABLE_VERBOSE_STRINGS=ON -DHTTP_ONLY=ON -DCURL_ENABLE_SSL=OFF -DUSE_LIBIDN2=OFF -DCURL_USE_LIBPSL=OFF -DCURL_USE_LIBSSH2=OFF -DENABLE_UNIX_SOCKETS=OFF
+        cmake . -DCMAKE_C_COMPILER=clang-17 -DCMAKE_C_FLAGS='-fsanitize=memory -fsanitize-recover -fsanitize-memory-track-origins -Og -fno-omit-frame-pointer -g' -DBUILD_CURL_EXE=OFF -DBUILD_SHARED_LIBS=OFF -DCURL_ZLIB=OFF -DCURL_DISABLE_ALTSVC=ON -DCURL_DISABLE_COOKIES=ON -DCURL_DISABLE_DOH=ON -DCURL_DISABLE_GETOPTIONS=ON -DCURL_DISABLE_HSTS=ON -DCURL_DISABLE_LIBCURL_OPTION=ON -DCURL_DISABLE_MIME=ON -DCURL_DISABLE_NETRC=ON -DCURL_DISABLE_NTLM=ON -DCURL_DISABLE_PARSEDATE=ON -DCURL_DISABLE_PROGRESS_METER=ON -DCURL_DISABLE_SHUFFLE_DNS=ON -DCURL_DISABLE_SOCKETPAIR=ON -DCURL_DISABLE_VERBOSE_STRINGS=ON -DHTTP_ONLY=ON -DCURL_ENABLE_SSL=OFF -DUSE_LIBIDN2=OFF -DCURL_USE_LIBPSL=OFF -DCURL_USE_LIBSSH2=OFF -DENABLE_UNIX_SOCKETS=OFF
         make -j$(nproc)
         cd lib && mkdir .libs && cp libcurl.a .libs
 
@@ -127,7 +127,7 @@ jobs:
         cd external/src/libuv
         mkdir build
         cd build
-        cmake .. -DCMAKE_C_COMPILER=clang-17 -DCMAKE_C_FLAGS='-fsanitize=memory -fsanitize-recover -fsanitize-memory-track-origins -Os -fno-omit-frame-pointer -g' -DBUILD_TESTING=OFF -DLIBUV_BUILD_SHARED=OFF
+        cmake .. -DCMAKE_C_COMPILER=clang-17 -DCMAKE_C_FLAGS='-fsanitize=memory -fsanitize-recover -fsanitize-memory-track-origins -Og -fno-omit-frame-pointer -g' -DBUILD_TESTING=OFF -DLIBUV_BUILD_SHARED=OFF
         make -j$(nproc)
 
     - name: Build libzmq
@@ -135,14 +135,14 @@ jobs:
         cd external/src/libzmq
         mkdir build
         cd build
-        cmake .. -DCMAKE_C_COMPILER=clang-17 -DCMAKE_CXX_COMPILER=clang++-17 -DCMAKE_C_FLAGS='-fsanitize=memory -fsanitize-recover -fsanitize-memory-track-origins -Os -fno-omit-frame-pointer -g' -DCMAKE_CXX_FLAGS='-nostdinc++ -nostdlib++ -fsanitize=memory -fsanitize-recover -fsanitize-memory-track-origins -Os -fno-omit-frame-pointer -g -isystem /tmp/libcxx_msan/include/c++/v1 -L/tmp/libcxx_msan/lib -lc++ -lc++abi -Wno-unused-command-line-argument' -DWITH_LIBSODIUM=OFF -DWITH_LIBBSD=OFF -DBUILD_TESTS=OFF -DWITH_DOCS=OFF -DENABLE_DRAFTS=OFF -DBUILD_SHARED=OFF
+        cmake .. -DCMAKE_C_COMPILER=clang-17 -DCMAKE_CXX_COMPILER=clang++-17 -DCMAKE_C_FLAGS='-fsanitize=memory -fsanitize-recover -fsanitize-memory-track-origins -Og -fno-omit-frame-pointer -g' -DCMAKE_CXX_FLAGS='-nostdinc++ -nostdlib++ -fsanitize=memory -fsanitize-recover -fsanitize-memory-track-origins -Og -fno-omit-frame-pointer -g -isystem /tmp/libcxx_msan/include/c++/v1 -L/tmp/libcxx_msan/lib -lc++ -lc++abi -Wno-unused-command-line-argument' -DWITH_LIBSODIUM=OFF -DWITH_LIBBSD=OFF -DBUILD_TESTS=OFF -DWITH_DOCS=OFF -DENABLE_DRAFTS=OFF -DBUILD_SHARED=OFF
         make -j$(nproc)
 
     - name: Build p2pool
       run: |
         mkdir build
         cd build
-        cmake .. -DCMAKE_C_COMPILER=clang-17 -DCMAKE_CXX_COMPILER=clang++-17 -DCMAKE_C_FLAGS='-fsanitize=memory -fsanitize-recover -fsanitize-memory-track-origins -fno-omit-frame-pointer -g' -DCMAKE_CXX_FLAGS='-nostdinc++ -nostdlib++ -fsanitize=memory -fsanitize-recover -fsanitize-memory-track-origins -isystem /tmp/libcxx_msan/include/c++/v1 -L/tmp/libcxx_msan/lib -Wl,-rpath /tmp/libcxx_msan/lib -lc++ -lc++abi -Wno-unused-command-line-argument -fuse-ld=lld-17 -fno-omit-frame-pointer -g' -DDEV_TEST_SYNC=ON -DDEV_WITH_MSAN=ON -DSTATIC_LIBS=ON
+        cmake .. -DCMAKE_C_COMPILER=clang-17 -DCMAKE_CXX_COMPILER=clang++-17 -DCMAKE_C_FLAGS='-fsanitize=memory -fsanitize-recover -fsanitize-memory-track-origins -fno-omit-frame-pointer -g' -DCMAKE_CXX_FLAGS='-nostdinc++ -nostdlib++ -fsanitize=memory -fsanitize-recover -fsanitize-memory-track-origins -isystem /tmp/libcxx_msan/include/c++/v1 -L/tmp/libcxx_msan/lib -Wl,-rpath /tmp/libcxx_msan/lib -lc++ -lc++abi -Wno-unused-command-line-argument -fuse-ld=lld-17 -fno-omit-frame-pointer -g' -DDEV_TEST_SYNC=ON -DDEV_WITH_MSAN=ON -DWITH_LTO=OFF -DSTATIC_LIBS=ON
         make -j$(nproc)
 
     - name: Run p2pool
@@ -191,7 +191,7 @@ jobs:
       run: |
         mkdir build
         cd build
-        cmake .. -DDEV_TEST_SYNC=ON -DDEV_WITH_UBSAN=ON -DCMAKE_C_COMPILER=gcc-12 -DCMAKE_CXX_COMPILER=g++-12 -DCMAKE_C_FLAGS="-flto=2" -DCMAKE_CXX_FLAGS="-flto=2"
+        cmake .. -DDEV_TEST_SYNC=ON -DDEV_WITH_UBSAN=ON -DCMAKE_C_COMPILER=gcc-12 -DCMAKE_CXX_COMPILER=g++-12 -DWITH_LTO=OFF
         make -j$(nproc)
 
     - name: Run p2pool
@@ -240,7 +240,7 @@ jobs:
       run: |
         mkdir build
         cd build
-        cmake .. -DDEV_TEST_SYNC=ON -DDEV_WITH_ASAN=ON -DCMAKE_C_COMPILER=gcc-12 -DCMAKE_CXX_COMPILER=g++-12 -DCMAKE_C_FLAGS="-flto=2" -DCMAKE_CXX_FLAGS="-flto=2"
+        cmake .. -DDEV_TEST_SYNC=ON -DDEV_WITH_ASAN=ON -DCMAKE_C_COMPILER=gcc-12 -DCMAKE_CXX_COMPILER=g++-12 -DWITH_LTO=OFF
         make -j$(nproc)
 
     - name: Run p2pool
@@ -287,7 +287,7 @@ jobs:
     - name: Build libcurl
       run: |
         cd external/src/curl
-        cmake . -DCMAKE_C_COMPILER="$(brew --prefix llvm@15)/bin/clang" -DCMAKE_AR="$(brew --prefix llvm@15)/bin/llvm-ar" -DCMAKE_RANLIB="$(brew --prefix llvm@15)/bin/llvm-ranlib" -DCMAKE_C_FLAGS="-Os -flto" -DBUILD_CURL_EXE=OFF -DBUILD_SHARED_LIBS=OFF -DCURL_ZLIB=OFF -DCURL_DISABLE_ALTSVC=ON -DCURL_DISABLE_COOKIES=ON -DCURL_DISABLE_DOH=ON -DCURL_DISABLE_GETOPTIONS=ON -DCURL_DISABLE_HSTS=ON -DCURL_DISABLE_LIBCURL_OPTION=ON -DCURL_DISABLE_MIME=ON -DCURL_DISABLE_NETRC=ON -DCURL_DISABLE_NTLM=ON -DCURL_DISABLE_PARSEDATE=ON -DCURL_DISABLE_PROGRESS_METER=ON -DCURL_DISABLE_SHUFFLE_DNS=ON -DCURL_DISABLE_SOCKETPAIR=ON -DCURL_DISABLE_VERBOSE_STRINGS=ON -DHTTP_ONLY=ON -DCURL_ENABLE_SSL=OFF -DUSE_LIBIDN2=OFF -DCURL_USE_LIBPSL=OFF -DCURL_USE_LIBSSH2=OFF -DENABLE_UNIX_SOCKETS=OFF
+        cmake . -DCMAKE_C_COMPILER="$(brew --prefix llvm@15)/bin/clang" -DCMAKE_AR="$(brew --prefix llvm@15)/bin/llvm-ar" -DCMAKE_RANLIB="$(brew --prefix llvm@15)/bin/llvm-ranlib" -DCMAKE_C_FLAGS="-Og" -DBUILD_CURL_EXE=OFF -DBUILD_SHARED_LIBS=OFF -DCURL_ZLIB=OFF -DCURL_DISABLE_ALTSVC=ON -DCURL_DISABLE_COOKIES=ON -DCURL_DISABLE_DOH=ON -DCURL_DISABLE_GETOPTIONS=ON -DCURL_DISABLE_HSTS=ON -DCURL_DISABLE_LIBCURL_OPTION=ON -DCURL_DISABLE_MIME=ON -DCURL_DISABLE_NETRC=ON -DCURL_DISABLE_NTLM=ON -DCURL_DISABLE_PARSEDATE=ON -DCURL_DISABLE_PROGRESS_METER=ON -DCURL_DISABLE_SHUFFLE_DNS=ON -DCURL_DISABLE_SOCKETPAIR=ON -DCURL_DISABLE_VERBOSE_STRINGS=ON -DHTTP_ONLY=ON -DCURL_ENABLE_SSL=OFF -DUSE_LIBIDN2=OFF -DCURL_USE_LIBPSL=OFF -DCURL_USE_LIBSSH2=OFF -DENABLE_UNIX_SOCKETS=OFF
         make -j3
         cd lib && mkdir .libs && cp libcurl.a .libs
 
@@ -296,7 +296,7 @@ jobs:
         cd external/src/libuv
         mkdir build
         cd build
-        cmake .. -DCMAKE_C_COMPILER="$(brew --prefix llvm@15)/bin/clang" -DCMAKE_AR="$(brew --prefix llvm@15)/bin/llvm-ar" -DCMAKE_RANLIB="$(brew --prefix llvm@15)/bin/llvm-ranlib" -DCMAKE_C_FLAGS='-Os -flto' -DBUILD_TESTING=OFF -DLIBUV_BUILD_SHARED=OFF
+        cmake .. -DCMAKE_C_COMPILER="$(brew --prefix llvm@15)/bin/clang" -DCMAKE_AR="$(brew --prefix llvm@15)/bin/llvm-ar" -DCMAKE_RANLIB="$(brew --prefix llvm@15)/bin/llvm-ranlib" -DCMAKE_C_FLAGS='-Og' -DBUILD_TESTING=OFF -DLIBUV_BUILD_SHARED=OFF
         make -j3
 
     - name: Build libzmq
@@ -304,14 +304,14 @@ jobs:
         cd external/src/libzmq
         mkdir build
         cd build
-        cmake .. -DCMAKE_C_COMPILER="$(brew --prefix llvm@15)/bin/clang" -DCMAKE_CXX_COMPILER="$(brew --prefix llvm@15)/bin/clang++" -DCMAKE_AR="$(brew --prefix llvm@15)/bin/llvm-ar" -DCMAKE_RANLIB="$(brew --prefix llvm@15)/bin/llvm-ranlib" -DCMAKE_C_FLAGS='-Os -flto' -DCMAKE_CXX_FLAGS='-Os -flto' -DWITH_LIBSODIUM=OFF -DWITH_LIBBSD=OFF -DBUILD_TESTS=OFF -DWITH_DOCS=OFF -DENABLE_DRAFTS=OFF -DBUILD_SHARED=OFF
+        cmake .. -DCMAKE_C_COMPILER="$(brew --prefix llvm@15)/bin/clang" -DCMAKE_CXX_COMPILER="$(brew --prefix llvm@15)/bin/clang++" -DCMAKE_AR="$(brew --prefix llvm@15)/bin/llvm-ar" -DCMAKE_RANLIB="$(brew --prefix llvm@15)/bin/llvm-ranlib" -DCMAKE_C_FLAGS='-Og' -DCMAKE_CXX_FLAGS='-Og' -DWITH_LIBSODIUM=OFF -DWITH_LIBBSD=OFF -DBUILD_TESTS=OFF -DWITH_DOCS=OFF -DENABLE_DRAFTS=OFF -DBUILD_SHARED=OFF
         make -j3
 
     - name: Build p2pool
       run: |
         mkdir build
         cd build
-        cmake .. -DCMAKE_C_COMPILER="$(brew --prefix llvm@15)/bin/clang" -DCMAKE_CXX_COMPILER="$(brew --prefix llvm@15)/bin/clang++" -DCMAKE_AR="$(brew --prefix llvm@15)/bin/llvm-ar" -DCMAKE_RANLIB="$(brew --prefix llvm@15)/bin/llvm-ranlib" -DCMAKE_C_FLAGS="-flto" -DCMAKE_CXX_FLAGS="-flto" -DSTATIC_LIBS=ON -DDEV_TEST_SYNC=ON
+        cmake .. -DCMAKE_C_COMPILER="$(brew --prefix llvm@15)/bin/clang" -DCMAKE_CXX_COMPILER="$(brew --prefix llvm@15)/bin/clang++" -DCMAKE_AR="$(brew --prefix llvm@15)/bin/llvm-ar" -DCMAKE_RANLIB="$(brew --prefix llvm@15)/bin/llvm-ranlib" -DWITH_LTO=OFF -DSTATIC_LIBS=ON -DDEV_TEST_SYNC=ON
         make -j3
 
     - name: Run p2pool
diff --git a/cmake/flags.cmake b/cmake/flags.cmake
index 1aac963..7b81e86 100644
--- a/cmake/flags.cmake
+++ b/cmake/flags.cmake
@@ -38,7 +38,7 @@ if (CMAKE_CXX_COMPILER_ID MATCHES GNU)
 	set(WARNING_FLAGS "-Wall -Wextra -Wcast-qual -Wlogical-op -Wstrict-overflow=2 -Wundef -Wformat=2 -Wpointer-arith -Werror")
 
 	if (DEV_WITH_TSAN OR DEV_WITH_UBSAN OR DEV_WITH_ASAN)
-		set(OPTIMIZATION_FLAGS "-O2 -g")
+		set(OPTIMIZATION_FLAGS "-Og -g")
 	else()
 		set(OPTIMIZATION_FLAGS "-Ofast -s")
 	endif()
@@ -97,7 +97,7 @@ elseif (CMAKE_CXX_COMPILER_ID MATCHES Clang)
 	set(WARNING_FLAGS "-Wall -Wextra -Wno-undefined-internal -Wunreachable-code-aggressive -Wmissing-prototypes -Wmissing-variable-declarations -Werror")
 
 	if (DEV_WITH_MSAN)
-		set(OPTIMIZATION_FLAGS "-O2 -g")
+		set(OPTIMIZATION_FLAGS "-Og -g")
 	else()
 		set(OPTIMIZATION_FLAGS "-Ofast -funroll-loops -fmerge-all-constants")
 	endif()
diff --git a/src/p2p_server.cpp b/src/p2p_server.cpp
index 446dd2d..06417b2 100644
--- a/src/p2p_server.cpp
+++ b/src/p2p_server.cpp
@@ -1435,7 +1435,7 @@ void P2PServer::P2PClient::reset()
 
 bool P2PServer::P2PClient::on_connect()
 {
-	P2PServer* server = static_cast<P2PServer*>(m_owner);
+	const P2PServer* server = static_cast<P2PServer*>(m_owner);
 
 	if (!server) {
 		return false;
diff --git a/src/util.h b/src/util.h
index e534f54..9ac31bb 100644
--- a/src/util.h
+++ b/src/util.h
@@ -35,7 +35,7 @@
 namespace p2pool {
 
 #define P2POOL_VERSION_MAJOR 3
-#define P2POOL_VERSION_MINOR 8
+#define P2POOL_VERSION_MINOR 9
 #define P2POOL_VERSION_PATCH 0
 
 extern const char* VERSION;