diff --git a/.github/workflows/bors.yml b/.github/workflows/bors.yml
index 116a01b05e849..b693e4dd9d281 100644
--- a/.github/workflows/bors.yml
+++ b/.github/workflows/bors.yml
@@ -8,166 +8,19 @@ on:
 
 permissions: {}
 jobs:
-  docker_linux_tier1:
-    permissions:
-      actions: write # to cancel workflows (rust-lang/simpleinfra/github-actions/cancel-outdated-builds)
-      contents: read # to fetch code (actions/checkout)
-
-    name: Docker Linux Tier1
-    runs-on: ubuntu-22.04
-    strategy:
-      fail-fast: true
-      matrix:
-        target: [
-          i686-unknown-linux-gnu,
-          x86_64-unknown-linux-gnu,
-        ]
-    steps:
-      - uses: rust-lang/simpleinfra/github-actions/cancel-outdated-builds@master
-        with:
-          github_token: "${{ secrets.GITHUB_TOKEN }}"
-      - uses: actions/checkout@v3
-      - name: Setup Rust toolchain
-        run: TARGET=${{ matrix.target }} sh ./ci/install-rust.sh
-      - name: Execute run-docker.sh
-        run: LIBC_CI=1 sh ./ci/run-docker.sh ${{ matrix.target }}
-
-  macos:
-    permissions:
-      actions: write # to cancel workflows (rust-lang/simpleinfra/github-actions/cancel-outdated-builds)
-      contents: read # to fetch code (actions/checkout)
-
-    name: macOS
-    runs-on: macos-12
-    strategy:
-      fail-fast: true
-      matrix:
-        target: [
-          x86_64-apple-darwin,
-        ]
-    steps:
-      - uses: rust-lang/simpleinfra/github-actions/cancel-outdated-builds@master
-        with:
-          github_token: "${{ secrets.GITHUB_TOKEN }}"
-      - uses: actions/checkout@v3
-      - name: Setup Rust toolchain
-        run: TARGET=${{ matrix.target }} sh ./ci/install-rust.sh
-      - name: Execute run.sh
-        run: LIBC_CI=1 sh ./ci/run.sh ${{ matrix.target }}
-
-  windows:
-    permissions:
-      actions: write # to cancel workflows (rust-lang/simpleinfra/github-actions/cancel-outdated-builds)
-      contents: read # to fetch code (actions/checkout)
-
-    name: Windows
-    runs-on: windows-2022
-    env:
-      OS: windows
-    strategy:
-      fail-fast: true
-      matrix:
-        include:
-          - target: x86_64-pc-windows-gnu
-            env:
-              ARCH_BITS: 64
-              ARCH: x86_64
-          - target: x86_64-pc-windows-msvc
-          # Disabled because broken:
-          #  https://github.com/rust-lang/libc/issues/1592
-          #- target: i686-pc-windows-gnu
-          #  env:
-          #    ARCH_BITS: 32
-          #    ARCH: i686
-          - target: i686-pc-windows-msvc
-    steps:
-      - uses: rust-lang/simpleinfra/github-actions/cancel-outdated-builds@master
-        with:
-          github_token: "${{ secrets.GITHUB_TOKEN }}"
-      - uses: actions/checkout@v3
-      - name: Self-update rustup
-        run: rustup self update
-        shell: bash
-      - name: Setup Rust toolchain
-        run: TARGET=${{ matrix.target }} sh ./ci/install-rust.sh
-        shell: bash
-      - name: Execute run.sh
-        run: LIBC_CI=1 sh ./ci/run.sh ${{ matrix.target }}
-        shell: bash
-
-  style_check:
-    permissions:
-      actions: write # to cancel workflows (rust-lang/simpleinfra/github-actions/cancel-outdated-builds)
-      contents: read # to fetch code (actions/checkout)
-
-    name: Style check
-    runs-on: ubuntu-22.04
-    steps:
-      - uses: rust-lang/simpleinfra/github-actions/cancel-outdated-builds@master
-        with:
-          github_token: "${{ secrets.GITHUB_TOKEN }}"
-      - uses: actions/checkout@v3
-      - name: Setup Rust toolchain
-        run: sh ./ci/install-rust.sh
-      - name: Check style
-        run: sh ci/style.sh
-
   docker_linux_tier2:
     permissions:
       actions: write # to cancel workflows (rust-lang/simpleinfra/github-actions/cancel-outdated-builds)
       contents: read # to fetch code (actions/checkout)
 
     name: Docker Linux Tier2
-    needs: [docker_linux_tier1, style_check]
     runs-on: ubuntu-22.04
     strategy:
       fail-fast: true
       max-parallel: 12
       matrix:
         target: [
-          # FIXME: Mysterious failures in CI, see
-          # https://github.com/rust-lang/libc/issues/2081
-          # aarch64-linux-android,
-          aarch64-unknown-linux-gnu,
-          aarch64-unknown-linux-musl,
-          # FIXME: The emulator gets stuck.
-          # arm-linux-androideabi,
-          arm-unknown-linux-gnueabihf,
-          arm-unknown-linux-musleabihf,
-          asmjs-unknown-emscripten,
-          # FIXME: Started to fail since 2022-10-10:
-          # error: linking with `i686-linux-android-gcc` failed: exit status: 1
-          # ld: error: cannot find -lunwind
-          # i686-linux-android,
-          i686-unknown-linux-musl,
-          mips-unknown-linux-gnu,
-          mips-unknown-linux-musl,
-          # FIXME: Somehow failed on CI
-          # https://github.com/rust-lang/libc/runs/1659882216
-          # mips64-unknown-linux-gnuabi64,
-          # mips64el-unknown-linux-gnuabi64,
-          mipsel-unknown-linux-musl,
-          powerpc-unknown-linux-gnu,
-          powerpc64-unknown-linux-gnu,
-          powerpc64le-unknown-linux-gnu,
-          s390x-unknown-linux-gnu,
-          riscv64gc-unknown-linux-gnu,
-          # FIXME: A recent nightly causes a linker failure:
-          # https://github.com/rust-lang/rust/issues/76679
-          # See this comment for more details:
-          # https://github.com/rust-lang/libc/pull/2225#issuecomment-880696737
-          #wasm32-wasi,
-          sparc64-unknown-linux-gnu,
-          wasm32-unknown-emscripten,
-          # FIXME: Started to fail since 2022-10-10:
-          # error: linking with `x86_64-linux-android-gcc` failed: exit status: 1
-          # ld: error: cannot find -lunwind
-          # x86_64-linux-android,
-          x86_64-unknown-linux-gnux32,
-          x86_64-unknown-linux-musl,
-          # FIXME: It seems some items in `src/unix/mod.rs`
-          # aren't defined on redox actually.
-          # x86_64-unknown-redox,
+          i686-linux-android,
         ]
     steps:
       - uses: rust-lang/simpleinfra/github-actions/cancel-outdated-builds@master
@@ -179,195 +32,6 @@ jobs:
       - name: Execute run-docker.sh
         run: LIBC_CI=1 sh ./ci/run-docker.sh ${{ matrix.target }}
 
-  # These targets are tier 3 or otherwise need to have CI build std via -Zbuild-std.
-  # Because of this, only the nightly compiler can be used on these targets.
-  docker_linux_build_std:
-    permissions:
-      actions: write # to cancel workflows (rust-lang/simpleinfra/github-actions/cancel-outdated-builds)
-      contents: read # to fetch code (actions/checkout)
-
-    if: ${{ false }} # This is currently broken
-    name: Docker Linux Build-Std Targets
-    needs: [docker_linux_tier1, style_check]
-    runs-on: ubuntu-22.04
-    strategy:
-      fail-fast: true
-      max-parallel: 12
-      matrix:
-        target: [
-          armv7-unknown-linux-uclibceabihf
-        ]
-    steps:
-      - uses: rust-lang/simpleinfra/github-actions/cancel-outdated-builds@master
-        with:
-          github_token: "${{ secrets.GITHUB_TOKEN }}"
-      - uses: actions/checkout@v3
-      - name: Setup Rust toolchain
-        run: TOOLCHAIN=nightly INSTALL_RUST_SRC=1 sh ./ci/install-rust.sh
-      - name: Execute run-docker.sh
-        run: LIBC_CI=1 TOOLCHAIN=nightly LIBC_CI_ZBUILD_STD=1 sh ./ci/run-docker.sh ${{ matrix.target }}
-
-  # devkitpro's pacman needs to be connected from Docker.
-  docker_switch:
-    permissions:
-      actions: write # to cancel workflows (rust-lang/simpleinfra/github-actions/cancel-outdated-builds)
-      contents: read # to fetch code (actions/checkout)
-
-    name: Docker Switch
-    needs: [docker_linux_tier1, style_check]
-    runs-on: ubuntu-22.04
-    steps:
-      - uses: rust-lang/simpleinfra/github-actions/cancel-outdated-builds@master
-        with:
-          github_token: "${{ secrets.GITHUB_TOKEN }}"
-      - uses: actions/checkout@v3
-      - name: Setup Rust toolchain
-        run: sh ./ci/install-rust.sh
-      - name: Execute run-docker.sh
-        run: LIBC_CI=1 sh ./ci/run-docker.sh switch
-
-  build_channels_linux:
-    permissions:
-      actions: write # to cancel workflows (rust-lang/simpleinfra/github-actions/cancel-outdated-builds)
-      contents: read # to fetch code (actions/checkout)
-
-    name: Build Channels Linux
-    needs: docker_linux_tier2
-    runs-on: ubuntu-22.04
-    env:
-      OS: linux
-    strategy:
-      fail-fast: true
-      max-parallel: 5
-      matrix:
-        toolchain: [
-          stable,
-          beta,
-          nightly,
-          1.13.0,
-          1.19.0,
-          1.24.0,
-          1.25.0,
-          1.30.0,
-        ]
-    steps:
-      - uses: rust-lang/simpleinfra/github-actions/cancel-outdated-builds@master
-        with:
-          github_token: "${{ secrets.GITHUB_TOKEN }}"
-      - uses: actions/checkout@v3
-      - name: Setup Rust toolchain
-        run: TOOLCHAIN=${{ matrix.toolchain }} sh ./ci/install-rust.sh
-      - name: Execute build.sh
-        run: LIBC_CI=1 TOOLCHAIN=${{ matrix.toolchain }} sh ./ci/build.sh
-
-  build_channels_macos:
-    permissions:
-      contents: read # to fetch code (actions/checkout)
-
-    name: Build Channels macOS
-    needs: macos
-    # FIXME: Use macOS 11 for now as CI failed with a linker error on macOS 12 image:
-    # ld: in /.../x86_64-apple-darwin/lib/libstd-a4729905.rlib(rust.metadata.bin),
-    # archive member 'rust.metadata.bin' with length 2958149 is not mach-o or llvm bitcode file '/.../x86_64-apple-darwin/lib/libstd-a4729905.rlib'
-    # Possibly related: https://github.com/actions/runner-images/issues/6350
-    runs-on: macos-11
-    env:
-      OS: macos
-    strategy:
-      fail-fast: true
-      max-parallel: 4
-      matrix:
-        toolchain: [
-          stable,
-          beta,
-          nightly,
-          1.13.0,
-          1.19.0,
-          1.24.0,
-          1.25.0,
-          1.30.0,
-        ]
-    steps:
-      - uses: rust-lang/simpleinfra/github-actions/cancel-outdated-builds@master
-        with:
-          github_token: "${{ secrets.GITHUB_TOKEN }}"
-      - uses: actions/checkout@v3
-      - name: Setup Rust toolchain
-        run: TOOLCHAIN=${{ matrix.toolchain }} sh ./ci/install-rust.sh
-      - name: Execute build.sh
-        run: LIBC_CI=1 TOOLCHAIN=${{ matrix.toolchain }} sh ./ci/build.sh
-
-  build_channels_windows:
-    permissions:
-      contents: read # to fetch code (actions/checkout)
-
-    name: Build Channels Windows
-    runs-on: windows-2022
-    env:
-      OS: windows
-    strategy:
-      fail-fast: true
-      matrix:
-        toolchain: [
-          1.19.0,
-          1.24.0,
-          1.25.0,
-          1.30.0,
-          stable,
-        ]
-    steps:
-      - uses: actions/checkout@v3
-      - name: Self-update rustup
-        run: rustup self update
-        shell: bash
-      - name: Execute build.sh
-        run: LIBC_CI=1 TOOLCHAIN=${{ matrix.toolchain }} WIN_TARGET=${{ matrix.target }} sh ./ci/build.sh
-        shell: bash
-
-  semver_linux:
-    if: ${{ false }} # This is currently broken
-    name: Semver Linux
-    runs-on: ubuntu-22.04
-    continue-on-error: true
-    steps:
-      - uses: actions/checkout@v3
-      - name: Setup Rust toolchain
-        # Should update the semverver revision in semver.sh if we touch nightly ver.
-        run: TOOLCHAIN=nightly-2022-05-23 sh ./ci/install-rust.sh
-      - name: Check breaking changes
-        run: sh ci/semver.sh linux
-
-  semver_macos:
-    if: ${{ false }} # This is currently broken
-    name: Semver macOS
-    runs-on: macos-12
-    continue-on-error: true
-    steps:
-      - uses: actions/checkout@v3
-      - name: Setup Rust toolchain
-        # Pin nightly version to make semverver compilable.
-        run: TOOLCHAIN=nightly-2022-05-23 sh ./ci/install-rust.sh
-      - name: Check breaking changes
-        run: sh ci/semver.sh macos
-
-  docs:
-    permissions:
-      actions: write # to cancel workflows (rust-lang/simpleinfra/github-actions/cancel-outdated-builds)
-      contents: read # to fetch code (actions/checkout)
-
-    name: Generate documentation
-    runs-on: ubuntu-22.04
-    needs: docker_linux_tier2
-    steps:
-      - uses: rust-lang/simpleinfra/github-actions/cancel-outdated-builds@master
-        with:
-          github_token: "${{ secrets.GITHUB_TOKEN }}"
-      - uses: actions/checkout@v3
-      - name: Setup Rust toolchain
-        run: sh ./ci/install-rust.sh
-      - name: Generate documentation
-        run: LIBC_CI=1 sh ci/dox.sh
-
   # These jobs doesn't actually test anything, but they're only used to tell
   # bors the build completed, as there is no practical way to detect when a
   # workflow is successful listening to webhooks only.
@@ -379,17 +43,7 @@ jobs:
     if: github.event.pusher.name == 'bors' && success()
     runs-on: ubuntu-22.04
     needs: [
-      docker_linux_tier1,
       docker_linux_tier2,
-      #docker_linux_build_std,
-      macos,
-      windows,
-      style_check,
-      docker_switch,
-      build_channels_linux,
-      build_channels_macos,
-      build_channels_windows,
-      docs,
     ]
 
     steps:
@@ -401,17 +55,7 @@ jobs:
     if: github.event.pusher.name == 'bors' && (failure() || cancelled())
     runs-on: ubuntu-22.04
     needs: [
-      docker_linux_tier1,
       docker_linux_tier2,
-      #docker_linux_build_std,
-      macos,
-      windows,
-      style_check,
-      docker_switch,
-      build_channels_linux,
-      build_channels_macos,
-      build_channels_windows,
-      docs,
     ]
 
     steps:
diff --git a/.github/workflows/main.yml b/.github/workflows/main.yml
index 635d6121e69c4..d8dcec9512480 100644
--- a/.github/workflows/main.yml
+++ b/.github/workflows/main.yml
@@ -1,8 +1,6 @@
 name: CI
 
 on:
-  pull_request:
-    types: [opened, synchronize, reopened]
   push:
     branches:
       - master
diff --git a/ci/android-install-sdk.sh b/ci/android-install-sdk.sh
index 6f6aeb28e82b0..0a6bfce6a8985 100644
--- a/ci/android-install-sdk.sh
+++ b/ci/android-install-sdk.sh
@@ -53,11 +53,13 @@ echo '#Fri Nov 03 10:11:27 CET 2017 count=0' >> /root/.android/repositories.cfg
 # which produces an insane amount of output.
 yes | ./sdk/cmdline-tools/tools/bin/sdkmanager --licenses --no_https | grep -v = || true
 yes | ./sdk/cmdline-tools/tools/bin/sdkmanager --no_https \
-        "emulator" \
         "platform-tools" \
         "platforms;android-${api}" \
         "${image}" | grep -v = || true
 
+wget -q --tries=20 https://redirector.gvt1.com/edgedl/android/repository/emulator-linux_x64-9058569.zip
+unzip -q -d sdk emulator-linux_x64-9058569.zip
+
 echo "no" |
     ./sdk/cmdline-tools/tools/bin/avdmanager create avd \
         --name "${1}" \
diff --git a/ci/install-rust.sh b/ci/install-rust.sh
index d7e2be8070dc0..3146ace90740c 100644
--- a/ci/install-rust.sh
+++ b/ci/install-rust.sh
@@ -8,7 +8,7 @@ toolchain=
 if [ -n "$TOOLCHAIN" ]; then
   toolchain=$TOOLCHAIN
 else
-  toolchain=nightly
+  toolchain=nightly-2022-10-09
 fi
 if [ "$OS" = "windows" ]; then
   : "${TARGET?The TARGET environment variable must be set.}"