diff --git a/.github/workflows/go.yml b/.github/workflows/go.yml
index 93b97cb79..249b78a97 100644
--- a/.github/workflows/go.yml
+++ b/.github/workflows/go.yml
@@ -12,7 +12,7 @@ jobs:
     strategy:
       matrix:
         go-version: [1.16.x]
-        os: [ubuntu-latest, windows-latest]
+        os: [ubuntu-latest, windows-latest, macos-latest]
     steps:
       - uses: actions/checkout@v2
       - uses: actions/setup-node@v1
@@ -21,6 +21,13 @@ jobs:
       - uses: actions/setup-go@v2
         with:
           go-version: ${{ matrix.go-version }}
+      - name: Build on ${{ matrix.os }}
+        if: matrix.os == 'macos-latest'
+        env:
+          CGO_ENABLED: 0
+          GO111MODULE: on
+        run: |
+          make test
       - name: Build on ${{ matrix.os }}
         if: matrix.os == 'windows-latest'
         env:
@@ -42,8 +49,6 @@ jobs:
           curl -L -o nancy https://github.com/sonatype-nexus-community/nancy/releases/download/${nancy_version}/nancy-${nancy_version}-linux-amd64 && chmod +x nancy
           go list -m all | ./nancy sleuth
           make
-          diff -au <(gofmt -s -d cmd) <(printf "")
-          diff -au <(gofmt -s -d pkg) <(printf "")
           make test-race
           make crosscompile
           make verify
diff --git a/.golangci.yml b/.golangci.yml
index eb5cd76ec..5648022e9 100644
--- a/.golangci.yml
+++ b/.golangci.yml
@@ -17,6 +17,8 @@ linters:
     - gosimple
     - deadcode
     - structcheck
+    - gomodguard
+    - gofmt
 
 issues:
   exclude-use-default: false
diff --git a/Makefile b/Makefile
index 52ebf4766..71b4437d7 100644
--- a/Makefile
+++ b/Makefile
@@ -17,32 +17,22 @@ checks:
 getdeps:
 	@mkdir -p ${GOPATH}/bin
 	@which golangci-lint 1>/dev/null || (echo "Installing golangci-lint" && curl -sSfL https://raw.githubusercontent.com/golangci/golangci-lint/master/install.sh | sh -s -- -b $(GOPATH)/bin v1.27.0)
-	@which ruleguard 1>/dev/null || (echo "Installing ruleguard" && go get github.com/quasilyte/go-ruleguard/cmd/ruleguard@v0.2.1)
 	@which msgp 1>/dev/null || (echo "Installing msgp" && go get github.com/tinylib/msgp@v1.1.3)
 	@which stringer 1>/dev/null || (echo "Installing stringer" && go get golang.org/x/tools/cmd/stringer)
 
 crosscompile:
 	@(env bash $(PWD)/buildscripts/cross-compile.sh)
 
-verifiers: getdeps fmt lint ruleguard check-gen
+verifiers: getdeps lint check-gen
 
 check-gen:
 	@go generate ./... >/dev/null
 	@(! git diff --name-only | grep '_gen.go$$') || (echo "Non-committed changes in auto-generated code is detected, please commit them to proceed." && false)
 
-fmt:
-	@echo "Running $@ check"
-	@GO111MODULE=on gofmt -d cmd/
-	@GO111MODULE=on gofmt -d pkg/
-
 lint:
 	@echo "Running $@ check"
 	@GO111MODULE=on ${GOPATH}/bin/golangci-lint cache clean
-	@GO111MODULE=on ${GOPATH}/bin/golangci-lint run --timeout=10m --config ./.golangci.yml
-
-ruleguard:
-	@echo "Running $@ check"
-	@${GOPATH}/bin/ruleguard -rules ruleguard.rules.go github.com/minio/minio/...
+	@GO111MODULE=on ${GOPATH}/bin/golangci-lint run --build-tags kqueue --timeout=10m --config ./.golangci.yml
 
 # Builds minio, runs the verifiers then runs the tests.
 check: test
diff --git a/cmd/http/dial_others.go b/cmd/http/dial_others.go
index ebdf8e912..0943fdd47 100644
--- a/cmd/http/dial_others.go
+++ b/cmd/http/dial_others.go
@@ -26,6 +26,7 @@ import (
 )
 
 // TODO: if possible implement for non-linux platforms, not a priority at the moment
+//nolint:deadcode
 func setInternalTCPParameters(c syscall.RawConn) error {
 	return nil
 }
diff --git a/mint/build/minio-java/install.sh b/mint/build/minio-java/install.sh
index 361c36792..35b8de4f1 100755
--- a/mint/build/minio-java/install.sh
+++ b/mint/build/minio-java/install.sh
@@ -15,7 +15,9 @@
 #  limitations under the License.
 #
 
-SPOTBUGS_VERSION="4.1.2" ## needed since 8.0.2 release
+set -x
+SPOTBUGS_VERSION="4.2.2" ## needed since 8.0.2 release
+JUNIT_VERSION="4.12" ## JUNIT version
 MINIO_JAVA_VERSION=$(curl --retry 10 -s "https://repo1.maven.org/maven2/io/minio/minio/maven-metadata.xml" | sed -n "/<latest>/{s/<.[^>]*>//g;p;q}" | sed "s/  *//g")
 if [ -z "$MINIO_JAVA_VERSION" ]; then
     echo "unable to get latest minio-java version from maven"
@@ -23,10 +25,12 @@ if [ -z "$MINIO_JAVA_VERSION" ]; then
 fi
 
 test_run_dir="$MINT_RUN_CORE_DIR/minio-java"
+mkdir -p ${test_run_dir}
 git clone --quiet https://github.com/minio/minio-java.git "$test_run_dir/minio-java.git"
 (cd "$test_run_dir/minio-java.git"; git checkout --quiet "tags/${MINIO_JAVA_VERSION}")
 $WGET --output-document="$test_run_dir/minio-${MINIO_JAVA_VERSION}-all.jar" "https://repo1.maven.org/maven2/io/minio/minio/${MINIO_JAVA_VERSION}/minio-${MINIO_JAVA_VERSION}-all.jar"
 $WGET --output-document="$test_run_dir/spotbugs-annotations-${SPOTBUGS_VERSION}.jar" "https://repo1.maven.org/maven2/com/github/spotbugs/spotbugs-annotations/${SPOTBUGS_VERSION}/spotbugs-annotations-${SPOTBUGS_VERSION}.jar"
-javac -cp "$test_run_dir/minio-${MINIO_JAVA_VERSION}-all.jar:$test_run_dir/spotbugs-annotations-${SPOTBUGS_VERSION}.jar" "${test_run_dir}/minio-java.git/functional"/*.java
+$WGET --output-document="$test_run_dir/junit-${JUNIT_VERSION}.jar" "https://repo1.maven.org/maven2/junit/junit/${JUNIT_VERSION}/junit-${JUNIT_VERSION}.jar"
+javac -cp "$test_run_dir/minio-${MINIO_JAVA_VERSION}-all.jar:$test_run_dir/spotbugs-annotations-${SPOTBUGS_VERSION}.jar:$test_run_dir/junit-${JUNIT_VERSION}.jar" "${test_run_dir}/minio-java.git/functional"/*.java
 cp -a "${test_run_dir}/minio-java.git/functional"/*.class "$test_run_dir/"
 rm -fr "$test_run_dir/minio-java.git"
diff --git a/mint/install-packages.list b/mint/install-packages.list
index 6af4ef66d..c65815268 100644
--- a/mint/install-packages.list
+++ b/mint/install-packages.list
@@ -2,7 +2,6 @@ git
 python3-pip
 nodejs
 openjdk-8-jdk
-openjdk-8-jre
 dirmngr
 apt-transport-https
 dotnet-sdk-2.1
diff --git a/mint/preinstall.sh b/mint/preinstall.sh
index c2403c742..ef8d446cb 100755
--- a/mint/preinstall.sh
+++ b/mint/preinstall.sh
@@ -38,7 +38,7 @@ $APT update
 $APT install gnupg ca-certificates
 
 # download and install golang
-GO_VERSION="1.15.2"
+GO_VERSION="1.16"
 GO_INSTALL_PATH="/usr/local"
 download_url="https://storage.googleapis.com/golang/go${GO_VERSION}.linux-amd64.tar.gz"
 if ! $WGET --output-document=- "$download_url" | tar -C "${GO_INSTALL_PATH}" -zxf -; then
diff --git a/mint/run/core/minio-go/go.sum b/mint/run/core/minio-go/go.sum
new file mode 100644
index 000000000..1e3b87a77
--- /dev/null
+++ b/mint/run/core/minio-go/go.sum
@@ -0,0 +1,80 @@
+github.com/cheggaaa/pb v1.0.29/go.mod h1:W40334L7FMC5JKWldsTWbdGjLo0RxUKK73K+TuPxX30=
+github.com/davecgh/go-spew v1.1.0/go.mod h1:J7Y8YcW2NihsgmVo/mv3lAwl/skON4iLHjSsI+c5H38=
+github.com/davecgh/go-spew v1.1.1/go.mod h1:J7Y8YcW2NihsgmVo/mv3lAwl/skON4iLHjSsI+c5H38=
+github.com/dustin/go-humanize v1.0.0 h1:VSnTsYCnlFHaM2/igO1h6X3HA71jcobQuxemgkq4zYo=
+github.com/dustin/go-humanize v1.0.0/go.mod h1:HtrtbFcZ19U5GC7JDqmcUSB87Iq5E25KnS6fMYU6eOk=
+github.com/fatih/color v1.9.0/go.mod h1:eQcE1qtQxscV5RaZvpXrrb8Drkc3/DdQ+uUYCNjL+zU=
+github.com/google/gofuzz v1.0.0/go.mod h1:dBl0BpW6vV/+mYPU4Po3pmUjxk6FQPldtuIdl/M65Eg=
+github.com/google/uuid v1.1.1 h1:Gkbcsh/GbpXz7lPftLA3P6TYMwjCLYm83jiFQZF/3gY=
+github.com/google/uuid v1.1.1/go.mod h1:TIyPZe4MgqvfeYDBFedMoGGpEw/LqOeaOT+nhxU+yHo=
+github.com/gopherjs/gopherjs v0.0.0-20181017120253-0766667cb4d1/go.mod h1:wJfORRmW1u3UXTncJ5qlYoELFm8eSnnEO6hX4iZ3EWY=
+github.com/json-iterator/go v1.1.10 h1:Kz6Cvnvv2wGdaG/V8yMvfkmNiXq9Ya2KUv4rouJJr68=
+github.com/json-iterator/go v1.1.10/go.mod h1:KdQUCv79m/52Kvf8AW2vK1V8akMuk1QjK/uOdHXbAo4=
+github.com/jtolds/gls v4.20.0+incompatible/go.mod h1:QJZ7F/aHp+rZTRtaJ1ow/lLfFfVYBRgL+9YlvaHOwJU=
+github.com/klauspost/cpuid v1.2.3/go.mod h1:Pj4uuM528wm8OyEC2QMXAi2YiTZ96dNQPGgoMS4s3ek=
+github.com/klauspost/cpuid v1.3.1 h1:5JNjFYYQrZeKRJ0734q51WCEEn2huer72Dc7K+R/b6s=
+github.com/klauspost/cpuid v1.3.1/go.mod h1:bYW4mA6ZgKPob1/Dlai2LviZJO7KGI3uoWLd42rAQw4=
+github.com/kr/pretty v0.1.0 h1:L/CwN0zerZDmRFUapSPitk6f+Q3+0za1rQkzVuMiMFI=
+github.com/kr/pretty v0.1.0/go.mod h1:dAy3ld7l9f0ibDNOQOHHMYYIIbhfbHSm3C4ZsoJORNo=
+github.com/kr/pty v1.1.1/go.mod h1:pFQYn66WHrOpPYNljwOMqo10TkYh1fy3cYio2l3bCsQ=
+github.com/kr/text v0.1.0/go.mod h1:4Jbv+DJW3UT/LiOwJeYQe1efqtUx/iVham/4vfdArNI=
+github.com/mattn/go-colorable v0.1.4/go.mod h1:U0ppj6V5qS13XJ6of8GYAs25YV2eR4EVcfRqFIhoBtE=
+github.com/mattn/go-isatty v0.0.8/go.mod h1:Iq45c/XA43vh69/j3iqttzPXn0bhXyGjM0Hdxcsrc5s=
+github.com/mattn/go-isatty v0.0.11/go.mod h1:PhnuNfih5lzO57/f3n+odYbM4JtupLOxQOAqxQCu2WE=
+github.com/mattn/go-runewidth v0.0.4/go.mod h1:LwmH8dsx7+W8Uxz3IHJYH5QSwggIsqBzpuz5H//U1FU=
+github.com/minio/md5-simd v1.1.0 h1:QPfiOqlZH+Cj9teu0t9b1nTBfPbyTl16Of5MeuShdK4=
+github.com/minio/md5-simd v1.1.0/go.mod h1:XpBqgZULrMYD3R+M28PcmP0CkI7PEMzB3U77ZrKZ0Gw=
+github.com/minio/minio-go/v7 v7.0.7 h1:Qld/xb8C1Pwbu0jU46xAceyn9xXKCMW+3XfNbpmTB70=
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+github.com/minio/sio v0.2.1 h1:NjzKiIMSMcHediVQR0AFVx2tp7Wxh9tKPfDI3kH7aHQ=
+github.com/minio/sio v0.2.1/go.mod h1:8b0yPp2avGThviy/+OCJBI6OMpvxoUuiLvE6F1lebhw=
+github.com/mitchellh/go-homedir v1.1.0 h1:lukF9ziXFxDFPkA1vsr5zpc1XuPDn/wFntq5mG+4E0Y=
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+golang.org/x/sys v0.0.0-20200625212154-ddb9806d33ae/go.mod h1:h1NjWce9XRLGQEsW7wpKNCjG9DtNlClVuFLEZdDNbEs=
+golang.org/x/text v0.3.0/go.mod h1:NqM8EUOU14njkJ3fqMW+pc6Ldnwhi/IjpwHt7yyuwOQ=
+golang.org/x/text v0.3.3 h1:cokOdA+Jmi5PJGXLlLllQSgYigAEfHXJAERHVMaCc2k=
+golang.org/x/text v0.3.3/go.mod h1:5Zoc/QRtKVWzQhOtBMvqHzDpF6irO9z98xDceosuGiQ=
+golang.org/x/tools v0.0.0-20180917221912-90fa682c2a6e/go.mod h1:n7NCudcB/nEzxVGmLbDWY5pfWTLqBcC2KZ6jyYvM4mQ=
+golang.org/x/tools v0.0.0-20190328211700-ab21143f2384/go.mod h1:LCzVGOaR6xXOjkQ3onu1FJEFr0SW1gC7cKk1uF8kGRs=
+gopkg.in/check.v1 v0.0.0-20161208181325-20d25e280405/go.mod h1:Co6ibVJAznAaIkqp8huTwlJQCZ016jof/cbN4VW5Yz0=
+gopkg.in/check.v1 v1.0.0-20180628173108-788fd7840127/go.mod h1:Co6ibVJAznAaIkqp8huTwlJQCZ016jof/cbN4VW5Yz0=
+gopkg.in/ini.v1 v1.57.0 h1:9unxIsFcTt4I55uWluz+UmL95q4kdJ0buvQ1ZIqVQww=
+gopkg.in/ini.v1 v1.57.0/go.mod h1:pNLf8WUiyNEtQjuu5G5vTm06TEv9tsIgeAvK8hOrP4k=
+gopkg.in/yaml.v2 v2.2.2/go.mod h1:hI93XBmqTisBFMUTm0b8Fm+jr3Dg1NNxqwp+5A1VGuI=
+gopkg.in/yaml.v2 v2.2.8 h1:obN1ZagJSUGI0Ek/LBmuj4SNLPfIny3KsKFopxRdj10=
+gopkg.in/yaml.v2 v2.2.8/go.mod h1:hI93XBmqTisBFMUTm0b8Fm+jr3Dg1NNxqwp+5A1VGuI=
diff --git a/pkg/disk/stat_bsd.go b/pkg/disk/stat_bsd.go
index 9d0305ec0..601695c0c 100644
--- a/pkg/disk/stat_bsd.go
+++ b/pkg/disk/stat_bsd.go
@@ -1,7 +1,7 @@
-// +build darwin freebsd dragonfly
+// +build darwin dragonfly
 
 /*
- * MinIO Cloud Storage, (C) 2015, 2016, 2017 MinIO, Inc.
+ * MinIO Cloud Storage, (C) 2015-2021 MinIO, Inc.
  *
  * Licensed under the Apache License, Version 2.0 (the "License");
  * you may not use this file except in compliance with the License.
@@ -30,12 +30,12 @@ func GetInfo(path string) (info Info, err error) {
 	if err != nil {
 		return Info{}, err
 	}
-	reservedBlocks := uint64(s.Bfree) - uint64(s.Bavail)
+	reservedBlocks := s.Bfree - s.Bavail
 	info = Info{
-		Total:  uint64(s.Bsize) * (uint64(s.Blocks) - reservedBlocks),
-		Free:   uint64(s.Bsize) * uint64(s.Bavail),
-		Files:  uint64(s.Files),
-		Ffree:  uint64(s.Ffree),
+		Total:  uint64(s.Bsize) * (s.Blocks - reservedBlocks),
+		Free:   uint64(s.Bsize) * s.Bavail,
+		Files:  s.Files,
+		Ffree:  s.Ffree,
 		FSType: getFSType(s.Fstypename[:]),
 	}
 	if info.Free > info.Total {
diff --git a/pkg/disk/stat_freebsd.go b/pkg/disk/stat_freebsd.go
new file mode 100644
index 000000000..2488e9f9b
--- /dev/null
+++ b/pkg/disk/stat_freebsd.go
@@ -0,0 +1,46 @@
+// +build freebsd
+
+/*
+ * MinIO Cloud Storage, (C) 2021 MinIO, Inc.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package disk
+
+import (
+	"fmt"
+	"syscall"
+)
+
+// GetInfo returns total and free bytes available in a directory, e.g. `/`.
+func GetInfo(path string) (info Info, err error) {
+	s := syscall.Statfs_t{}
+	err = syscall.Statfs(path, &s)
+	if err != nil {
+		return Info{}, err
+	}
+	reservedBlocks := s.Bfree - uint64(s.Bavail)
+	info = Info{
+		Total:  uint64(s.Bsize) * (s.Blocks - reservedBlocks),
+		Free:   uint64(s.Bsize) * uint64(s.Bavail),
+		Files:  s.Files,
+		Ffree:  uint64(s.Ffree),
+		FSType: getFSType(s.Fstypename[:]),
+	}
+	if info.Free > info.Total {
+		return info, fmt.Errorf("detected free space (%d) > total disk space (%d), fs corruption at (%s). please run 'fsck'", info.Free, info.Total, path)
+	}
+	info.Used = info.Total - info.Free
+	return info, nil
+}
diff --git a/pkg/smart/types.go b/pkg/smart/types.go
index 2d8f6a5b0..6a379f91e 100644
--- a/pkg/smart/types.go
+++ b/pkg/smart/types.go
@@ -19,7 +19,7 @@ package smart
 import "math/big"
 
 // Defined in <linux/nvme_ioctl.h>
-//nolint:structcheck
+//nolint:structcheck,deadcode
 type nvmePassthruCommand struct {
 	opcode      uint8
 	flags       uint8
@@ -59,6 +59,7 @@ type nvmeIdentPowerState struct {
 	Rsvd23          [9]byte
 }
 
+//nolint:deadcode
 type nvmeIdentController struct {
 	VendorID     uint16                  // PCI Vendor ID
 	Ssvid        uint16                  // PCI Subsystem Vendor ID
@@ -150,6 +151,7 @@ type nvmeIdentNamespace struct {
 	Vs      [3712]byte
 } // 4096 bytes
 
+//nolint:deadcode
 type nvmeSMARTLog struct {
 	CritWarning      uint8
 	Temperature      [2]uint8
@@ -174,6 +176,7 @@ type nvmeSMARTLog struct {
 } // 512 bytes
 
 // NVMeDevice represents drive data about NVMe drives
+//nolint:structcheck
 type NVMeDevice struct {
 	Name string
 	fd   int
diff --git a/pkg/sys/stats_darwin.go b/pkg/sys/stats_darwin.go
index 33c283385..681b14b5b 100644
--- a/pkg/sys/stats_darwin.go
+++ b/pkg/sys/stats_darwin.go
@@ -1,7 +1,7 @@
 // +build darwin
 
 /*
- * MinIO Cloud Storage, (C) 2016,2017 MinIO, Inc.
+ * MinIO Cloud Storage, (C) 2016-2021 MinIO, Inc.
  *
  * Licensed under the Apache License, Version 2.0 (the "License");
  * you may not use this file except in compliance with the License.
@@ -33,9 +33,7 @@ func getHwMemsize() (uint64, error) {
 	// removes the last byte of the result if it's 0 :/
 	totalString += "\x00"
 
-	total := uint64(binary.LittleEndian.Uint64([]byte(totalString)))
-
-	return total, nil
+	return binary.LittleEndian.Uint64([]byte(totalString)), nil
 }
 
 // GetStats - return system statistics for macOS.