[llvm] Document some of the regular admin tasks (PR #133825)

[LLVM Continuous Integration via llvm-commits]

llvm-ci wrote:

LLVM Buildbot has detected a new failure on builder `sanitizer-aarch64-linux-bootstrap-asan` running on `sanitizer-buildbot8` while building `llvm` at step 2 "annotate".

Full details are available at: https://lab.llvm.org/buildbot/#/builders/24/builds/12478

<details>
<summary>Here is the relevant piece of the build log for the reference</summary>

```
Step 2 (annotate) failure: 'python ../sanitizer_buildbot/sanitizers/zorg/buildbot/builders/sanitizers/buildbot_selector.py' (failure)
...
llvm-lit: /home/b/sanitizer-aarch64-linux-bootstrap-asan/build/llvm-project/llvm/utils/lit/lit/llvm/config.py:527: note: using lld-link: /home/b/sanitizer-aarch64-linux-bootstrap-asan/build/llvm_build_asan/bin/lld-link
llvm-lit: /home/b/sanitizer-aarch64-linux-bootstrap-asan/build/llvm-project/llvm/utils/lit/lit/llvm/config.py:527: note: using ld64.lld: /home/b/sanitizer-aarch64-linux-bootstrap-asan/build/llvm_build_asan/bin/ld64.lld
llvm-lit: /home/b/sanitizer-aarch64-linux-bootstrap-asan/build/llvm-project/llvm/utils/lit/lit/llvm/config.py:527: note: using wasm-ld: /home/b/sanitizer-aarch64-linux-bootstrap-asan/build/llvm_build_asan/bin/wasm-ld
llvm-lit: /home/b/sanitizer-aarch64-linux-bootstrap-asan/build/llvm-project/llvm/utils/lit/lit/llvm/config.py:527: note: using ld.lld: /home/b/sanitizer-aarch64-linux-bootstrap-asan/build/llvm_build_asan/bin/ld.lld
llvm-lit: /home/b/sanitizer-aarch64-linux-bootstrap-asan/build/llvm-project/llvm/utils/lit/lit/llvm/config.py:527: note: using lld-link: /home/b/sanitizer-aarch64-linux-bootstrap-asan/build/llvm_build_asan/bin/lld-link
llvm-lit: /home/b/sanitizer-aarch64-linux-bootstrap-asan/build/llvm-project/llvm/utils/lit/lit/llvm/config.py:527: note: using ld64.lld: /home/b/sanitizer-aarch64-linux-bootstrap-asan/build/llvm_build_asan/bin/ld64.lld
llvm-lit: /home/b/sanitizer-aarch64-linux-bootstrap-asan/build/llvm-project/llvm/utils/lit/lit/llvm/config.py:527: note: using wasm-ld: /home/b/sanitizer-aarch64-linux-bootstrap-asan/build/llvm_build_asan/bin/wasm-ld
llvm-lit: /home/b/sanitizer-aarch64-linux-bootstrap-asan/build/llvm-project/llvm/utils/lit/lit/main.py:74: note: The test suite configuration requested an individual test timeout of 0 seconds but a timeout of 900 seconds was requested on the command line. Forcing timeout to be 900 seconds.
-- Testing: 90510 tests, 72 workers --
Testing:  0.. 10.. 20.. 30.. 40.. 50.. 60.. 70.. 80.. 90..
FAIL: lld :: MachO/read-workers.s (90177 of 90510)
******************** TEST 'lld :: MachO/read-workers.s' FAILED ********************
Exit Code: 1

Command Output (stdout):
--
# RUN: at line 2
/home/b/sanitizer-aarch64-linux-bootstrap-asan/build/llvm_build_asan/bin/llvm-mc -filetype=obj -triple=x86_64-apple-darwin /home/b/sanitizer-aarch64-linux-bootstrap-asan/build/llvm-project/lld/test/MachO/read-workers.s -o /home/b/sanitizer-aarch64-linux-bootstrap-asan/build/llvm_build_asan/tools/lld/test/MachO/Output/read-workers.s.tmp.o
# executed command: /home/b/sanitizer-aarch64-linux-bootstrap-asan/build/llvm_build_asan/bin/llvm-mc -filetype=obj -triple=x86_64-apple-darwin /home/b/sanitizer-aarch64-linux-bootstrap-asan/build/llvm-project/lld/test/MachO/read-workers.s -o /home/b/sanitizer-aarch64-linux-bootstrap-asan/build/llvm_build_asan/tools/lld/test/MachO/Output/read-workers.s.tmp.o
# note: command had no output on stdout or stderr
# RUN: at line 5
ld64.lld -arch x86_64 -platform_version macos 11.0 11.0 -syslibroot /home/b/sanitizer-aarch64-linux-bootstrap-asan/build/llvm-project/lld/test/MachO/Inputs/MacOSX.sdk -lSystem -fatal_warnings --read-workers=0 /home/b/sanitizer-aarch64-linux-bootstrap-asan/build/llvm_build_asan/tools/lld/test/MachO/Output/read-workers.s.tmp.o -o /dev/null
# executed command: ld64.lld -arch x86_64 -platform_version macos 11.0 11.0 -syslibroot /home/b/sanitizer-aarch64-linux-bootstrap-asan/build/llvm-project/lld/test/MachO/Inputs/MacOSX.sdk -lSystem -fatal_warnings --read-workers=0 /home/b/sanitizer-aarch64-linux-bootstrap-asan/build/llvm_build_asan/tools/lld/test/MachO/Output/read-workers.s.tmp.o -o /dev/null
# note: command had no output on stdout or stderr
# RUN: at line 6
ld64.lld -arch x86_64 -platform_version macos 11.0 11.0 -syslibroot /home/b/sanitizer-aarch64-linux-bootstrap-asan/build/llvm-project/lld/test/MachO/Inputs/MacOSX.sdk -lSystem -fatal_warnings --read-workers=1 /home/b/sanitizer-aarch64-linux-bootstrap-asan/build/llvm_build_asan/tools/lld/test/MachO/Output/read-workers.s.tmp.o -o /dev/null
# executed command: ld64.lld -arch x86_64 -platform_version macos 11.0 11.0 -syslibroot /home/b/sanitizer-aarch64-linux-bootstrap-asan/build/llvm-project/lld/test/MachO/Inputs/MacOSX.sdk -lSystem -fatal_warnings --read-workers=1 /home/b/sanitizer-aarch64-linux-bootstrap-asan/build/llvm_build_asan/tools/lld/test/MachO/Output/read-workers.s.tmp.o -o /dev/null
# note: command had no output on stdout or stderr
# RUN: at line 7
ld64.lld -arch x86_64 -platform_version macos 11.0 11.0 -syslibroot /home/b/sanitizer-aarch64-linux-bootstrap-asan/build/llvm-project/lld/test/MachO/Inputs/MacOSX.sdk -lSystem -fatal_warnings --read-workers=2 /home/b/sanitizer-aarch64-linux-bootstrap-asan/build/llvm_build_asan/tools/lld/test/MachO/Output/read-workers.s.tmp.o -o /dev/null
# executed command: ld64.lld -arch x86_64 -platform_version macos 11.0 11.0 -syslibroot /home/b/sanitizer-aarch64-linux-bootstrap-asan/build/llvm-project/lld/test/MachO/Inputs/MacOSX.sdk -lSystem -fatal_warnings --read-workers=2 /home/b/sanitizer-aarch64-linux-bootstrap-asan/build/llvm_build_asan/tools/lld/test/MachO/Output/read-workers.s.tmp.o -o /dev/null
# note: command had no output on stdout or stderr
# error: command failed with exit status: 1

--

********************
Testing:  0.. 10.. 20.. 30.. 40.. 50.. 60.. 70.. 80.. 90.. 
Slowest Tests:
--------------------------------------------------------------------------
253.68s: Clang :: Driver/fsanitize.c
164.85s: Clang :: Driver/arm-cortex-cpus-1.c
164.78s: Clang :: Driver/arm-cortex-cpus-2.c
153.87s: Clang :: Preprocessor/riscv-target-features.c
137.41s: Clang :: OpenMP/target_defaultmap_codegen_01.cpp
132.90s: Clang :: OpenMP/target_update_codegen.cpp
124.09s: LLVM :: CodeGen/AMDGPU/sched-group-barrier-pipeline-solver.mir
123.27s: Clang :: Preprocessor/arm-target-features.c
122.56s: Clang :: Preprocessor/aarch64-target-features.c
Step 11 (stage2/asan check) failure: stage2/asan check (failure)
...
llvm-lit: /home/b/sanitizer-aarch64-linux-bootstrap-asan/build/llvm-project/llvm/utils/lit/lit/llvm/config.py:527: note: using lld-link: /home/b/sanitizer-aarch64-linux-bootstrap-asan/build/llvm_build_asan/bin/lld-link
llvm-lit: /home/b/sanitizer-aarch64-linux-bootstrap-asan/build/llvm-project/llvm/utils/lit/lit/llvm/config.py:527: note: using ld64.lld: /home/b/sanitizer-aarch64-linux-bootstrap-asan/build/llvm_build_asan/bin/ld64.lld
llvm-lit: /home/b/sanitizer-aarch64-linux-bootstrap-asan/build/llvm-project/llvm/utils/lit/lit/llvm/config.py:527: note: using wasm-ld: /home/b/sanitizer-aarch64-linux-bootstrap-asan/build/llvm_build_asan/bin/wasm-ld
llvm-lit: /home/b/sanitizer-aarch64-linux-bootstrap-asan/build/llvm-project/llvm/utils/lit/lit/llvm/config.py:527: note: using ld.lld: /home/b/sanitizer-aarch64-linux-bootstrap-asan/build/llvm_build_asan/bin/ld.lld
llvm-lit: /home/b/sanitizer-aarch64-linux-bootstrap-asan/build/llvm-project/llvm/utils/lit/lit/llvm/config.py:527: note: using lld-link: /home/b/sanitizer-aarch64-linux-bootstrap-asan/build/llvm_build_asan/bin/lld-link
llvm-lit: /home/b/sanitizer-aarch64-linux-bootstrap-asan/build/llvm-project/llvm/utils/lit/lit/llvm/config.py:527: note: using ld64.lld: /home/b/sanitizer-aarch64-linux-bootstrap-asan/build/llvm_build_asan/bin/ld64.lld
llvm-lit: /home/b/sanitizer-aarch64-linux-bootstrap-asan/build/llvm-project/llvm/utils/lit/lit/llvm/config.py:527: note: using wasm-ld: /home/b/sanitizer-aarch64-linux-bootstrap-asan/build/llvm_build_asan/bin/wasm-ld
llvm-lit: /home/b/sanitizer-aarch64-linux-bootstrap-asan/build/llvm-project/llvm/utils/lit/lit/main.py:74: note: The test suite configuration requested an individual test timeout of 0 seconds but a timeout of 900 seconds was requested on the command line. Forcing timeout to be 900 seconds.
-- Testing: 90510 tests, 72 workers --
Testing:  0.. 10.. 20.. 30.. 40.. 50.. 60.. 70.. 80.. 90..
FAIL: lld :: MachO/read-workers.s (90177 of 90510)
******************** TEST 'lld :: MachO/read-workers.s' FAILED ********************
Exit Code: 1

Command Output (stdout):
--
# RUN: at line 2
/home/b/sanitizer-aarch64-linux-bootstrap-asan/build/llvm_build_asan/bin/llvm-mc -filetype=obj -triple=x86_64-apple-darwin /home/b/sanitizer-aarch64-linux-bootstrap-asan/build/llvm-project/lld/test/MachO/read-workers.s -o /home/b/sanitizer-aarch64-linux-bootstrap-asan/build/llvm_build_asan/tools/lld/test/MachO/Output/read-workers.s.tmp.o
# executed command: /home/b/sanitizer-aarch64-linux-bootstrap-asan/build/llvm_build_asan/bin/llvm-mc -filetype=obj -triple=x86_64-apple-darwin /home/b/sanitizer-aarch64-linux-bootstrap-asan/build/llvm-project/lld/test/MachO/read-workers.s -o /home/b/sanitizer-aarch64-linux-bootstrap-asan/build/llvm_build_asan/tools/lld/test/MachO/Output/read-workers.s.tmp.o
# note: command had no output on stdout or stderr
# RUN: at line 5
ld64.lld -arch x86_64 -platform_version macos 11.0 11.0 -syslibroot /home/b/sanitizer-aarch64-linux-bootstrap-asan/build/llvm-project/lld/test/MachO/Inputs/MacOSX.sdk -lSystem -fatal_warnings --read-workers=0 /home/b/sanitizer-aarch64-linux-bootstrap-asan/build/llvm_build_asan/tools/lld/test/MachO/Output/read-workers.s.tmp.o -o /dev/null
# executed command: ld64.lld -arch x86_64 -platform_version macos 11.0 11.0 -syslibroot /home/b/sanitizer-aarch64-linux-bootstrap-asan/build/llvm-project/lld/test/MachO/Inputs/MacOSX.sdk -lSystem -fatal_warnings --read-workers=0 /home/b/sanitizer-aarch64-linux-bootstrap-asan/build/llvm_build_asan/tools/lld/test/MachO/Output/read-workers.s.tmp.o -o /dev/null
# note: command had no output on stdout or stderr
# RUN: at line 6
ld64.lld -arch x86_64 -platform_version macos 11.0 11.0 -syslibroot /home/b/sanitizer-aarch64-linux-bootstrap-asan/build/llvm-project/lld/test/MachO/Inputs/MacOSX.sdk -lSystem -fatal_warnings --read-workers=1 /home/b/sanitizer-aarch64-linux-bootstrap-asan/build/llvm_build_asan/tools/lld/test/MachO/Output/read-workers.s.tmp.o -o /dev/null
# executed command: ld64.lld -arch x86_64 -platform_version macos 11.0 11.0 -syslibroot /home/b/sanitizer-aarch64-linux-bootstrap-asan/build/llvm-project/lld/test/MachO/Inputs/MacOSX.sdk -lSystem -fatal_warnings --read-workers=1 /home/b/sanitizer-aarch64-linux-bootstrap-asan/build/llvm_build_asan/tools/lld/test/MachO/Output/read-workers.s.tmp.o -o /dev/null
# note: command had no output on stdout or stderr
# RUN: at line 7
ld64.lld -arch x86_64 -platform_version macos 11.0 11.0 -syslibroot /home/b/sanitizer-aarch64-linux-bootstrap-asan/build/llvm-project/lld/test/MachO/Inputs/MacOSX.sdk -lSystem -fatal_warnings --read-workers=2 /home/b/sanitizer-aarch64-linux-bootstrap-asan/build/llvm_build_asan/tools/lld/test/MachO/Output/read-workers.s.tmp.o -o /dev/null
# executed command: ld64.lld -arch x86_64 -platform_version macos 11.0 11.0 -syslibroot /home/b/sanitizer-aarch64-linux-bootstrap-asan/build/llvm-project/lld/test/MachO/Inputs/MacOSX.sdk -lSystem -fatal_warnings --read-workers=2 /home/b/sanitizer-aarch64-linux-bootstrap-asan/build/llvm_build_asan/tools/lld/test/MachO/Output/read-workers.s.tmp.o -o /dev/null
# note: command had no output on stdout or stderr
# error: command failed with exit status: 1

--

********************
Testing:  0.. 10.. 20.. 30.. 40.. 50.. 60.. 70.. 80.. 90.. 
Slowest Tests:
--------------------------------------------------------------------------
253.68s: Clang :: Driver/fsanitize.c
164.85s: Clang :: Driver/arm-cortex-cpus-1.c
164.78s: Clang :: Driver/arm-cortex-cpus-2.c
153.87s: Clang :: Preprocessor/riscv-target-features.c
137.41s: Clang :: OpenMP/target_defaultmap_codegen_01.cpp
132.90s: Clang :: OpenMP/target_update_codegen.cpp
124.09s: LLVM :: CodeGen/AMDGPU/sched-group-barrier-pipeline-solver.mir
123.27s: Clang :: Preprocessor/arm-target-features.c
122.56s: Clang :: Preprocessor/aarch64-target-features.c

```

</details>

https://github.com/llvm/llvm-project/pull/133825