[Bug] CMake Tools causes Ninja builds to stall intermittently on Linux

### Brief Issue Summary

When building a CMake/Ninja project ([DFHack](https://github.com/DFHack/dfhack/)) through CMake Tools in VS Code on Linux, the build takes significantly longer than the identical build from a terminal. During the VS Code build, Ninja intermittently stalls for several seconds.

The project has 612 build steps and is built from a clean state.

Terminal:

```text
$ time cmake --build build/ --config RelWithDebInfo --target all
[612/612] Linking CXX shared module plugins/stockpiles/stockpiles.plug.so

real 1m10.196s
user 22m24.291s
sys 1m45.415s
```

VS Code / CMake Tools:

```text
[build] Starting build
[proc] Executing command: /usr/bin/cmake --build /home/chris/git/dfhack/build --config RelWithDebInfo --target all --
...
[build] [612/612 100% :: 154.046] Linking CXX shared module plugins/stonesense/stonesense.plug.so
[driver] Build completed: 00:03:04.301
```

Both builds are from a clean state and execute all 612 build steps.

### CMake Tools Diagnostics

```shell
{
"os": "linux",
"vscodeVersion": "1.131.0",
"cmtVersion": "1.24.28",
"configurations": [
{
"folder": "/home/chris/git/dfhack",
"cmakeVersion": "4.3.4",
"configured": true,
"generator": "Ninja",
"usesPresets": false,
"compilers": {
"C": "/usr/bin/gcc-12",
"CXX": "/usr/bin/g++-12"
}
}
],
"cpptoolsIntegration": {
"isReady": false,
"hasCodeModel": false,
"activeBuildType": "",
"buildTypesSeen": [],
"requests": [],
"responses": [],
"partialMatches": [],
"targetCount": 0,
"executablesCount": 0,
"librariesCount": 0,
"targets": []
},
"settings": [
{
"communicationMode": "automatic",
"useCMakePresets": "auto",
"configureOnOpen": false
}
]
}
```

### Debug Log

```shell
[main] Building folder: /home/chris/git/dfhack/build clean
[main] Saving open files before configure/build
[build] Starting build
[driver] Start build clean
[proc] Executing command: /usr/bin/cmake --build /home/chris/git/dfhack/build --config RelWithDebInfo --target clean --
[proc] with environment: {"CHROME_DESKTOP":"code.desktop","COLORTERM":"truecolor","CONFIG_PROTECT":"/var/bind /usr/share/config","CONFIG_PROTECT_MASK":"/etc/sandbox.d /etc/fonts/fonts.conf /etc/gentoo-release /etc/dconf /etc/ca-certificates.conf /etc/texmf/web2c /etc/texmf/language.dat.d /etc/texmf/language.def.d /etc/texmf/updmap.d /etc/revdep-rebuild","DBUS_SESSION_BUS_ADDRESS":"unix:path=/run/user/1000/bus","DESKTOP_SESSION":"i3","DISPLAY":":0","DOCKER_HOST":"unix:///run/user/1000/podman/podman.sock","DOTNET_ROOT":"/opt/dotnet-sdk-bin-10.0","EDITOR":"/bin/nano","ELECTRON_NO_ATTACH_CONSOLE":"1","FC_FONTATIONS":"1","GDK_BACKEND":"x11","GDMSESSION":"i3","GSETTINGS_BACKEND":"dconf","GTK_MODULES":"canberra-gtk-module","HOME":"/home/chris","I3SOCK":"/run/user/1000/i3/ipc-socket.1437","INFOPATH":"/usr/share/gcc-data/x86_64-pc-linux-gnu/15/info:/usr/share/binutils-data/x86_64-pc-linux-gnu/2.46.0/info:/usr/share/autoconf-2.72/info:/usr/share/autoconf-2.13/info:/usr/share/automake-1.18.1/info:/usr/share/info:/usr/share/info/emacs-30","JAVAC":"/etc/java-config-2/current-system-vm/bin/javac","JAVA_HOME":"/etc/java-config-2/current-system-vm","JDK_HOME":"/etc/java-config-2/current-system-vm","KMP_DUPLICATE_LIB_OK":"TRUE","LANG":"C.UTF8","LESS":"-R -M --shift 5","LESSOPEN":"|lesspipe %s","LEX":"flex","LOGNAME":"chris","MAIL":"/var/mail/chris","MANPAGER":"manpager","MANPATH":"/etc/java-config-2/current-system-vm/man:/usr/share/gcc-data/x86_64-pc-linux-gnu/15/man:/usr/share/binutils-data/x86_64-pc-linux-gnu/2.46.0/man:/etc/java-config-2/current-system-vm/man/:/usr/local/share/man:/usr/share/man:/usr/lib/rust/man-bin-1.93.1:/usr/lib/rust/man-bin-1.94.1:/usr/lib/rust/man-bin-1.95.0:/usr/lib/llvm/22/share/man:/usr/lib/llvm/21/share/man","MOTD_SHOWN":"pam","MOZ_GMP_PATH":"/usr/lib64/nsbrowser/plugins/gmp-gmpopenh264/system-installed","NO_AT_BRIDGE":"1","NPM_CONFIG_GLOBALCONFIG":"/etc/npm/npmrc","PAGER":"/usr/bin/less","PATH":"/usr/local/sbin:/usr/local/bin:/usr/bin:/opt/bin:/usr/lib/llvm/22/bin:/usr/lib/llvm/21/bin","PWD":"/home/chris","R_HOME":"/usr/lib64/R","SHELL":"/bin/bash","SHLVL":"2","TERM":"xterm-256color","USER":"chris","VSCODE_CLI":"1","VSCODE_CODE_CACHE_PATH":"/home/chris/.config/Code/CachedData/e4c7e7b1d6d060162f4aa7f8225271b67ce1df75","VSCODE_CRASH_REPORTER_PROCESS_TYPE":"extensionHost","VSCODE_CWD":"/home/chris","VSCODE_ESM_ENTRYPOINT":"vs/workbench/api/node/extensionHostProcess","VSCODE_HANDLES_UNCAUGHT_ERRORS":"true","VSCODE_IPC_HOOK":"/run/user/1000/vscode-3ee20757-1.13-main.sock","VSCODE_NLS_CONFIG":"{\"userLocale\":\"en-us\",\"osLocale\":\"c\",\"resolvedLanguage\":\"en\",\"defaultMessagesFile\":\"/opt/vscode/resources/app/out/nls.messages.json\",\"locale\":\"en-us\",\"availableLanguages\":{}}","VSCODE_PID":"4589","VTE_VERSION":"8203","WINDOWID":"16777219","XAUTHORITY":"/home/chris/.Xauthority","XDG_CONFIG_DIRS":"/etc/xdg","XDG_CURRENT_DESKTOP":"i3","XDG_DATA_DIRS":"/usr/local/share:/usr/share","XDG_GREETER_DATA_DIR":"/var/lib/lightdm-data/chris","XDG_RUNTIME_DIR":"/run/user/1000","XDG_SEAT":"seat0","XDG_SEAT_PATH":"/org/freedesktop/DisplayManager/Seat0","XDG_SESSION_CLASS":"user","XDG_SESSION_DESKTOP":"i3","XDG_SESSION_ID":"3","XDG_SESSION_PATH":"/org/freedesktop/DisplayManager/Session0","XDG_SESSION_TYPE":"x11","XDG_VTNR":"7","_":"/opt/vscode/bin/../code","ELECTRON_RUN_AS_NODE":"1","APPLICATION_INSIGHTS_NO_STATSBEAT":"true","MXC_BIN_DIR":"/opt/vscode/resources/app/node_modules.asar.unpacked/@microsoft/mxc-sdk/bin","COPILOT_CLI_ENABLED_FEATURE_FLAGS":"SHELL_SPAWN_BACKEND","COPILOT_OTEL_FILE_EXPORTER_PATH":"/dev/null","VSCODE_L10N_BUNDLE_LOCATION":"","VSCODE_CMAKE_TOOLS":"1","NINJA_STATUS":"[%s/%t %p :: %e] "}
[build] [1/2 50% :: 0.105] Cleaning additional files...
[build] [2/2 100% :: 0.507] Cleaning all built files...
[build] Cleaning... 3983 files.
[driver] Build completed: 00:00:00.524
[build] Build finished with exit code 0
[main] Building folder: /home/chris/git/dfhack/build
[main] Saving open files before configure/build
[build] Starting build
[driver] Start build all
[proc] Executing command: /usr/bin/cmake --build /home/chris/git/dfhack/build --config RelWithDebInfo --target all --
[proc] with environment: {"CHROME_DESKTOP":"code.desktop","COLORTERM":"truecolor","CONFIG_PROTECT":"/var/bind /usr/share/config","CONFIG_PROTECT_MASK":"/etc/sandbox.d /etc/fonts/fonts.conf /etc/gentoo-release /etc/dconf /etc/ca-certificates.conf /etc/texmf/web2c /etc/texmf/language.dat.d /etc/texmf/language.def.d /etc/texmf/updmap.d /etc/revdep-rebuild","DBUS_SESSION_BUS_ADDRESS":"unix:path=/run/user/1000/bus","DESKTOP_SESSION":"i3","DISPLAY":":0","DOCKER_HOST":"unix:///run/user/1000/podman/podman.sock","DOTNET_ROOT":"/opt/dotnet-sdk-bin-10.0","EDITOR":"/bin/nano","ELECTRON_NO_ATTACH_CONSOLE":"1","FC_FONTATIONS":"1","GDK_BACKEND":"x11","GDMSESSION":"i3","GSETTINGS_BACKEND":"dconf","GTK_MODULES":"canberra-gtk-module","HOME":"/home/chris","I3SOCK":"/run/user/1000/i3/ipc-socket.1437","INFOPATH":"/usr/share/gcc-data/x86_64-pc-linux-gnu/15/info:/usr/share/binutils-data/x86_64-pc-linux-gnu/2.46.0/info:/usr/share/autoconf-2.72/info:/usr/share/autoconf-2.13/info:/usr/share/automake-1.18.1/info:/usr/share/info:/usr/share/info/emacs-30","JAVAC":"/etc/java-config-2/current-system-vm/bin/javac","JAVA_HOME":"/etc/java-config-2/current-system-vm","JDK_HOME":"/etc/java-config-2/current-system-vm","KMP_DUPLICATE_LIB_OK":"TRUE","LANG":"C.UTF8","LESS":"-R -M --shift 5","LESSOPEN":"|lesspipe %s","LEX":"flex","LOGNAME":"chris","MAIL":"/var/mail/chris","MANPAGER":"manpager","MANPATH":"/etc/java-config-2/current-system-vm/man:/usr/share/gcc-data/x86_64-pc-linux-gnu/15/man:/usr/share/binutils-data/x86_64-pc-linux-gnu/2.46.0/man:/etc/java-config-2/current-system-vm/man/:/usr/local/share/man:/usr/share/man:/usr/lib/rust/man-bin-1.93.1:/usr/lib/rust/man-bin-1.94.1:/usr/lib/rust/man-bin-1.95.0:/usr/lib/llvm/22/share/man:/usr/lib/llvm/21/share/man","MOTD_SHOWN":"pam","MOZ_GMP_PATH":"/usr/lib64/nsbrowser/plugins/gmp-gmpopenh264/system-installed","NO_AT_BRIDGE":"1","NPM_CONFIG_GLOBALCONFIG":"/etc/npm/npmrc","PAGER":"/usr/bin/less","PATH":"/usr/local/sbin:/usr/local/bin:/usr/bin:/opt/bin:/usr/lib/llvm/22/bin:/usr/lib/llvm/21/bin","PWD":"/home/chris","R_HOME":"/usr/lib64/R","SHELL":"/bin/bash","SHLVL":"2","TERM":"xterm-256color","USER":"chris","VSCODE_CLI":"1","VSCODE_CODE_CACHE_PATH":"/home/chris/.config/Code/CachedData/e4c7e7b1d6d060162f4aa7f8225271b67ce1df75","VSCODE_CRASH_REPORTER_PROCESS_TYPE":"extensionHost","VSCODE_CWD":"/home/chris","VSCODE_ESM_ENTRYPOINT":"vs/workbench/api/node/extensionHostProcess","VSCODE_HANDLES_UNCAUGHT_ERRORS":"true","VSCODE_IPC_HOOK":"/run/user/1000/vscode-3ee20757-1.13-main.sock","VSCODE_NLS_CONFIG":"{\"userLocale\":\"en-us\",\"osLocale\":\"c\",\"resolvedLanguage\":\"en\",\"defaultMessagesFile\":\"/opt/vscode/resources/app/out/nls.messages.json\",\"locale\":\"en-us\",\"availableLanguages\":{}}","VSCODE_PID":"4589","VTE_VERSION":"8203","WINDOWID":"16777219","XAUTHORITY":"/home/chris/.Xauthority","XDG_CONFIG_DIRS":"/etc/xdg","XDG_CURRENT_DESKTOP":"i3","XDG_DATA_DIRS":"/usr/local/share:/usr/share","XDG_GREETER_DATA_DIR":"/var/lib/lightdm-data/chris","XDG_RUNTIME_DIR":"/run/user/1000","XDG_SEAT":"seat0","XDG_SEAT_PATH":"/org/freedesktop/DisplayManager/Seat0","XDG_SESSION_CLASS":"user","XDG_SESSION_DESKTOP":"i3","XDG_SESSION_ID":"3","XDG_SESSION_PATH":"/org/freedesktop/DisplayManager/Session0","XDG_SESSION_TYPE":"x11","XDG_VTNR":"7","_":"/opt/vscode/bin/../code","ELECTRON_RUN_AS_NODE":"1","APPLICATION_INSIGHTS_NO_STATSBEAT":"true","MXC_BIN_DIR":"/opt/vscode/resources/app/node_modules.asar.unpacked/@microsoft/mxc-sdk/bin","COPILOT_CLI_ENABLED_FEATURE_FLAGS":"SHELL_SPAWN_BACKEND","COPILOT_OTEL_FILE_EXPORTER_PATH":"/dev/null","VSCODE_L10N_BUNDLE_LOCATION":"","VSCODE_CMAKE_TOOLS":"1","NINJA_STATUS":"[%s/%t %p :: %e] "}
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[build] [612/612 99% :: 156.130] Linking CXX shared module plugins/devel/ref-index.plug.so
[build] [612/612 99% :: 156.145] Linking CXX shared module plugins/autolabor/autolabor.plug.so
[build] [612/612 99% :: 156.169] Linking CXX shared module plugins/buildingplan/buildingplan.plug.so
[build] [612/612 99% :: 156.188] Linking CXX shared module plugins/stockpiles/stockpiles.plug.so
[build] [612/612 99% :: 156.256] Linking CXX shared module plugins/remotefortressreader/RemoteFortressReader.plug.so
[build] [612/612 100% :: 156.586] Linking CXX shared module plugins/stonesense/stonesense.plug.so
[driver] Build completed: 00:03:06.208
[build] Build finished with exit code 0
[extension] [7110] cmake.cleanRebuild finished (returned 0)
```

### Additional Information

During the VS Code build, CPU utilization alternates between all 24 logical CPUs being fully utilized and almost complete idle periods. This does not happen when running the same build from a terminal.

Note the gap of about 7 seconds between steps 213 and 214 and the gap of about 48 seconds between steps 385 and 386 in the build output provided above.

During the idle periods, `htop` shows many compiler processes in the `Z` (zombie) state. These processes are children of Ninja and have already exited, but Ninja has apparently not yet reaped them.

I monitored Ninja's kernel wait channel with:

```bash
while true; do
sleep 1
cat /proc/$(pgrep -a ninja | cut -d ' ' -f 1)/wchan
echo
done
```

From a terminal, Ninja is almost exclusively in:

```text
poll_schedule_timeout.constprop.0
```

When the build is launched through CMake Tools, Ninja enters:

```text
sock_alloc_send_pskb
```

during the periods where the build stalls.

This appears to indicate that Ninja is blocking while sending output through the communication channel to its parent process (VS Code/CMake Tools). While blocked, it cannot reap completed compiler processes, resulting in the observed zombies and idle CPU periods. This is corroborated by the fact that passing `--quiet` down to Ninja brings down the build time by more than a minute.

The payload names no source file, test, or entry point. Reproduce a clean 612-step Ninja build with CMake Tools in VS Code and compare it with the terminal command, using the supplied diagnostics and debug log as the starting evidence. Done means the intermittent stalls are explained and the VS Code build no longer has the reported slowdown.

Written by the indexing model from the issue text.