Getting WaitForExitWithTimeoutImpl when building skia with GN

[mattleibow]

• Your Windows build number: 10.0.16299.248

• What you're doing and what's happening:
  I am busy trying to build the SkiaSharp library - and at this stage I am at the build for the native skia.a. When I run GN normally (no verbosity args) or with -q, then I this message:

[0309/044708.104294:ERROR:process_posix.cc(192)] Not implemented reached in bool (anonymous namespace)::WaitForExitWithTimeoutImpl(base::ProcessHandle, int *, base::TimeDelta)

Interestingly, if I run it normally, this line appears twice, with -q it appears only once. However, if I run it with -v, then this does not appear. Also, interesting, the build still continues just fine.

• What's wrong / what should be happening instead:
  That line doesn't look like it should appear :)

• Strace of the failing command, if applicable:

./bin/gn gen out/linux/x64 -q --args="is_official_build=true skia_enable_tools=false target_os=\"linux\" target_cpu=\"x64\" skia_enable_gpu=false skia_use_system_freetype2=false skia_use_icu=false skia_use_sfntly=false skia_use_piex=true skia_use_dng_sdk=true skia_use_system_expat=false skia_use_system_libjpeg_turbo=false skia_use_system_libpng=false skia_use_system_libwebp=false skia_use_system_zlib=false extra_cflags=[ \"-DSKIA_C_DLL\" ] extra_ldflags=[  ]"

https://gist.github.com/mattleibow/b5b85d49566feb7418d48082c6801f29

[therealkenc]

That's #1353 aka #2786 aka the Rick Grimes problem. The library is trying to get the parent process id of a given process id here, but it's already died. You're correct, best evidence is it is only a soft fail.

18172 --- SIGCHLD {si_signo=SIGCHLD, si_code=CLD_EXITED, si_pid=18176, si_uid=1000, si_status=0, si_utime=0, si_stime=0} ---
18173 <... read resumed> "", 256)       = 0
18172 restart_syscall(<... resuming interrupted futex ...> <unfinished ...>
18173 read(6,  <unfinished ...>
18176 +++ exited with 0 +++
18173 <... read resumed> "", 256)       = 0
18173 open("/proc/18176/stat", O_RDONLY|O_CLOEXEC) = -1 ENOENT (No such file or directory)

PID 18176 has no /proc entry because it is dead.

[mattleibow]

Ah, thanks. So far this WSL thing has been going very well 😸 Thanks for your hard work guys!