diff --git a/.github/workflows/bors.yml b/.github/workflows/bors.yml
index bbeb86bd75341..5073de9993c11 100644
--- a/.github/workflows/bors.yml
+++ b/.github/workflows/bors.yml
@@ -103,7 +103,9 @@ jobs:
       max-parallel: 12
       matrix:
         target: [
-          aarch64-linux-android,
+          # 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,
           arm-linux-androideabi,
diff --git a/ci/dox.sh b/ci/dox.sh
index 67a0a75e76241..bcf20de5bfc29 100644
--- a/ci/dox.sh
+++ b/ci/dox.sh
@@ -6,12 +6,12 @@
 
 set -ex
 
-TARGET_DOC_DIR=target/doc
-README=README.md
-PLATFORM_SUPPORT=platform-support.md
+TARGET_DOC_DIR="target/doc"
+README="README.md"
+PLATFORM_SUPPORT="platform-support.md"
 
-rm -rf $TARGET_DOC_DIR
-mkdir -p $TARGET_DOC_DIR
+rm -rf "$TARGET_DOC_DIR"
+mkdir -p "$TARGET_DOC_DIR"
 
 if ! rustc --version | grep -E "nightly" ; then
     echo "Building the documentation requires a nightly Rust toolchain"
@@ -57,6 +57,7 @@ while read -r target; do
         --no-default-features --features extra_traits
     fi
 
+    mkdir -p "${TARGET_DOC_DIR}/${target}"
     cp -r "target/${target}/doc" "${TARGET_DOC_DIR}/${target}"
 
     echo "* [${target}](${target}/libc/index.html)" >> $PLATFORM_SUPPORT
diff --git a/ci/run.sh b/ci/run.sh
index 6fb059d2eae58..314ea088c6724 100755
--- a/ci/run.sh
+++ b/ci/run.sh
@@ -121,6 +121,6 @@ else
 
   cargo test $opt --manifest-path libc-test/Cargo.toml --target "${TARGET}"
 
-  cargo test $opt --features extra_traits --manifest-path libc-test/Cargo.toml \
+  RUST_BACKTRACE=1 cargo test $opt --features extra_traits --manifest-path libc-test/Cargo.toml \
     --target "${TARGET}"
 fi
diff --git a/ci/runtest-android.rs b/ci/runtest-android.rs
index b8030c41a7f6f..e14dba322cdf6 100644
--- a/ci/runtest-android.rs
+++ b/ci/runtest-android.rs
@@ -27,6 +27,7 @@ fn main() {
 
     let output = Command::new("adb")
         .arg("shell")
+        .arg("RUST_BACKTRACE=1")
         .arg(&dst)
         .output()
         .expect("failed to run: adb shell");
diff --git a/src/unix/linux_like/linux/musl/b64/mips64.rs b/src/unix/linux_like/linux/musl/b64/mips64.rs
index 06d09ea1b38d4..21ddc9c0e5e7c 100644
--- a/src/unix/linux_like/linux/musl/b64/mips64.rs
+++ b/src/unix/linux_like/linux/musl/b64/mips64.rs
@@ -639,37 +639,37 @@ pub const F_OFD_GETLK: ::c_int = 36;
 pub const F_OFD_SETLK: ::c_int = 37;
 pub const F_OFD_SETLKW: ::c_int = 38;
 
-pub const TCGETS: ::c_ulong = 0x540d;
-pub const TCSETS: ::c_ulong = 0x540e;
-pub const TCSETSW: ::c_ulong = 0x540f;
-pub const TCSETSF: ::c_ulong = 0x5410;
-pub const TCGETA: ::c_ulong = 0x5401;
-pub const TCSETA: ::c_ulong = 0x5402;
-pub const TCSETAW: ::c_ulong = 0x5403;
-pub const TCSETAF: ::c_ulong = 0x5404;
-pub const TCSBRK: ::c_ulong = 0x5405;
-pub const TCXONC: ::c_ulong = 0x5406;
-pub const TCFLSH: ::c_ulong = 0x5407;
-pub const TIOCGSOFTCAR: ::c_ulong = 0x5481;
-pub const TIOCSSOFTCAR: ::c_ulong = 0x5482;
-pub const TIOCINQ: ::c_ulong = 0x467f;
-pub const TIOCLINUX: ::c_ulong = 0x5483;
-pub const TIOCGSERIAL: ::c_ulong = 0x5484;
-pub const TIOCEXCL: ::c_ulong = 0x740d;
-pub const TIOCNXCL: ::c_ulong = 0x740e;
-pub const TIOCSCTTY: ::c_ulong = 0x5480;
-pub const TIOCGPGRP: ::c_ulong = 0x40047477;
-pub const TIOCSPGRP: ::c_ulong = 0x80047476;
-pub const TIOCOUTQ: ::c_ulong = 0x7472;
-pub const TIOCSTI: ::c_ulong = 0x5472;
-pub const TIOCGWINSZ: ::c_ulong = 0x40087468;
-pub const TIOCSWINSZ: ::c_ulong = 0x80087467;
-pub const TIOCMGET: ::c_ulong = 0x741d;
-pub const TIOCMBIS: ::c_ulong = 0x741b;
-pub const TIOCMBIC: ::c_ulong = 0x741c;
-pub const TIOCMSET: ::c_ulong = 0x741a;
-pub const FIONREAD: ::c_ulong = 0x467f;
-pub const TIOCCONS: ::c_ulong = 0x80047478;
+pub const TCGETS: ::c_int = 0x540d;
+pub const TCSETS: ::c_int = 0x540e;
+pub const TCSETSW: ::c_int = 0x540f;
+pub const TCSETSF: ::c_int = 0x5410;
+pub const TCGETA: ::c_int = 0x5401;
+pub const TCSETA: ::c_int = 0x5402;
+pub const TCSETAW: ::c_int = 0x5403;
+pub const TCSETAF: ::c_int = 0x5404;
+pub const TCSBRK: ::c_int = 0x5405;
+pub const TCXONC: ::c_int = 0x5406;
+pub const TCFLSH: ::c_int = 0x5407;
+pub const TIOCGSOFTCAR: ::c_int = 0x5481;
+pub const TIOCSSOFTCAR: ::c_int = 0x5482;
+pub const TIOCINQ: ::c_int = 0x467f;
+pub const TIOCLINUX: ::c_int = 0x5483;
+pub const TIOCGSERIAL: ::c_int = 0x5484;
+pub const TIOCEXCL: ::c_int = 0x740d;
+pub const TIOCNXCL: ::c_int = 0x740e;
+pub const TIOCSCTTY: ::c_int = 0x5480;
+pub const TIOCGPGRP: ::c_int = 0x40047477;
+pub const TIOCSPGRP: ::c_int = 0x80047476_u32 as i32;
+pub const TIOCOUTQ: ::c_int = 0x7472;
+pub const TIOCSTI: ::c_int = 0x5472;
+pub const TIOCGWINSZ: ::c_int = 0x40087468;
+pub const TIOCSWINSZ: ::c_int = 0x80087467_u32 as i32;
+pub const TIOCMGET: ::c_int = 0x741d;
+pub const TIOCMBIS: ::c_int = 0x741b;
+pub const TIOCMBIC: ::c_int = 0x741c;
+pub const TIOCMSET: ::c_int = 0x741a;
+pub const FIONREAD: ::c_int = 0x467f;
+pub const TIOCCONS: ::c_int = 0x80047478_u32 as i32;
 
 pub const MCL_CURRENT: ::c_int = 0x0001;
 pub const MCL_FUTURE: ::c_int = 0x0002;