MRE of compilation leaving MOLD zombies
Please use Dockerfile that installs gcc, cmake, make and mold, defines trivial CMake project with mold as a linker and provides shell script wrapping cmake + cmake --build followed by check for mold processes left.
Assuming Dockerfile in current directory, next steps are as follows:
- Build and start container:
docker build -tt . ; docker run -it --rm t su - - In container run wrapper script few times:
bash /x/b
After each run new zombie process ld.mold will appear (sample output also pasted below).
Tested with GCC 11, 12, 13 either with Ninja or Make.
[root@969b9d96458c ~]# bash /x/b
-- Configuring done (0.3s)
-- Generating done (0.0s)
-- Build files have been written to: /x/build
[ 50%] Building CXX object CMakeFiles/a.dir/main.cpp.o
[100%] Linking CXX executable a
[100%] Built target a
root 98 0.0 0.0 0 0 pts/0 Z+ 16:06 0:00 [ld.mold] <defunct>
root 113 0.0 0.0 16452 1096 pts/0 S+ 16:06 0:00 grep mold
[root@969b9d96458c ~]# bash /x/b
-- Configuring done (0.0s)
-- Generating done (0.0s)
-- Build files have been written to: /x/build
[ 50%] Building CXX object CMakeFiles/a.dir/main.cpp.o
[100%] Linking CXX executable a
[100%] Built target a
root 98 3.0 0.0 0 0 pts/0 Z 16:06 0:00 [ld.mold] <defunct>
root 135 0.0 0.0 0 0 pts/0 Z+ 16:06 0:00 [ld.mold] <defunct>
root 150 0.0 0.0 16452 1272 pts/0 S+ 16:06 0:00 grep mold
[root@969b9d96458c ~]# bash /x/b
-- Configuring done (0.0s)
-- Generating done (0.0s)
-- Build files have been written to: /x/build
[ 50%] Building CXX object CMakeFiles/a.dir/main.cpp.o
[100%] Linking CXX executable a
[100%] Built target a
root 98 1.0 0.0 0 0 pts/0 Z 16:06 0:00 [ld.mold] <defunct>
root 135 1.5 0.0 0 0 pts/0 Z 16:06 0:00 [ld.mold] <defunct>
root 172 0.0 0.0 0 0 pts/0 Z+ 16:06 0:00 [ld.mold] <defunct>
root 187 0.0 0.0 16452 1112 pts/0 S+ 16:06 0:00 grep mold
[root@969b9d96458c ~]# logout