diff --git a/.github/workflows/bsd.sh b/.github/workflows/bsd.sh
index e751d6b..c32ce30 100755
--- a/.github/workflows/bsd.sh
+++ b/.github/workflows/bsd.sh
@@ -1,7 +1,7 @@
 #!/usr/bin/env bash
 set -euo pipefail
 
-echo 'set -euo pipefail' > test.sh
+echo 'set -eu' > test.sh
 
 for p in $(go list ./...); do
   dir=".${p#github.com/ncruces/go-sqlite3}"
diff --git a/.github/workflows/illumos.sh b/.github/workflows/illumos.sh
new file mode 100755
index 0000000..9e5ed3d
--- /dev/null
+++ b/.github/workflows/illumos.sh
@@ -0,0 +1,11 @@
+#!/usr/bin/env bash
+set -euo pipefail
+
+echo 'set -eu' > test.sh
+
+for p in $(go list ./...); do
+  dir=".${p#github.com/ncruces/go-sqlite3}"
+  name="$(basename "$p").test"
+  (cd ${dir}; GOOS=illumos go test -c)
+  [ -f "${dir}/${name}" ] && echo "(cd ${dir}; ./${name} -test.v -test.short)" >> test.sh
+done
\ No newline at end of file
diff --git a/.github/workflows/test.yml b/.github/workflows/test.yml
index fc25dc4..630bd83 100644
--- a/.github/workflows/test.yml
+++ b/.github/workflows/test.yml
@@ -85,9 +85,30 @@ jobs:
         operating_system: freebsd
         version: '14.0'
         shell: bash
-        run: source test.sh
+        run: . ./test.sh
         sync_files: runner-to-vm
 
+  test-illumos:
+    runs-on: ubuntu-latest
+    needs: test
+
+    steps:
+    - uses: actions/checkout@v4
+      with: { lfs: 'true' }
+
+    - uses: actions/setup-go@v5
+      with: { go-version: stable }
+
+    - name: Build
+      run: .github/workflows/illumos.sh
+
+    - name: Test
+      uses: vmactions/omnios-vm@v1
+      with:
+        usesh: true
+        copyback: false
+        run: . ./test.sh
+
   test-m1:
     runs-on: macos-14
     needs: test
diff --git a/README.md b/README.md
index 3953454..967ba23 100644
--- a/README.md
+++ b/README.md
@@ -89,7 +89,7 @@ It also benefits greatly from [SQLite's](https://sqlite.org/testing.html) and
 
 The Go VFS is tested by running SQLite's
 [mptest](https://github.com/sqlite/sqlite/blob/master/mptest/mptest.c)
-on Linux, macOS, Windows and FreeBSD.
+on Linux, macOS, Windows, FreeBSD and illumos.
 
 ### Performance
 
diff --git a/ext/array/array_test.go b/ext/array/array_test.go
index 11e18db..a8844c2 100644
--- a/ext/array/array_test.go
+++ b/ext/array/array_test.go
@@ -11,6 +11,7 @@ import (
 	"github.com/ncruces/go-sqlite3/driver"
 	_ "github.com/ncruces/go-sqlite3/embed"
 	"github.com/ncruces/go-sqlite3/ext/array"
+	_ "github.com/ncruces/go-sqlite3/tests/testcfg"
 )
 
 func Example_driver() {
diff --git a/ext/blobio/blob_test.go b/ext/blobio/blob_test.go
index c7928ee..b7157b8 100644
--- a/ext/blobio/blob_test.go
+++ b/ext/blobio/blob_test.go
@@ -12,6 +12,7 @@ import (
 	_ "github.com/ncruces/go-sqlite3/embed"
 	"github.com/ncruces/go-sqlite3/ext/array"
 	"github.com/ncruces/go-sqlite3/ext/blobio"
+	_ "github.com/ncruces/go-sqlite3/tests/testcfg"
 	_ "github.com/ncruces/go-sqlite3/vfs/memdb"
 )
 
diff --git a/ext/csv/csv_test.go b/ext/csv/csv_test.go
index 21fe3ed..b423d92 100644
--- a/ext/csv/csv_test.go
+++ b/ext/csv/csv_test.go
@@ -8,6 +8,7 @@ import (
 	"github.com/ncruces/go-sqlite3"
 	_ "github.com/ncruces/go-sqlite3/embed"
 	"github.com/ncruces/go-sqlite3/ext/csv"
+	_ "github.com/ncruces/go-sqlite3/tests/testcfg"
 )
 
 func Example() {
diff --git a/ext/lines/lines_test.go b/ext/lines/lines_test.go
index 1431717..0c6a525 100644
--- a/ext/lines/lines_test.go
+++ b/ext/lines/lines_test.go
@@ -14,6 +14,7 @@ import (
 	"github.com/ncruces/go-sqlite3/driver"
 	_ "github.com/ncruces/go-sqlite3/embed"
 	"github.com/ncruces/go-sqlite3/ext/lines"
+	_ "github.com/ncruces/go-sqlite3/tests/testcfg"
 )
 
 func Example() {
diff --git a/ext/pivot/pivot_test.go b/ext/pivot/pivot_test.go
index 97970eb..959722f 100644
--- a/ext/pivot/pivot_test.go
+++ b/ext/pivot/pivot_test.go
@@ -9,6 +9,7 @@ import (
 	"github.com/ncruces/go-sqlite3"
 	_ "github.com/ncruces/go-sqlite3/embed"
 	"github.com/ncruces/go-sqlite3/ext/pivot"
+	_ "github.com/ncruces/go-sqlite3/tests/testcfg"
 )
 
 // https://antonz.org/sqlite-pivot-table/
diff --git a/ext/statement/stmt_test.go b/ext/statement/stmt_test.go
index 9e9d6a9..548238d 100644
--- a/ext/statement/stmt_test.go
+++ b/ext/statement/stmt_test.go
@@ -8,6 +8,7 @@ import (
 	"github.com/ncruces/go-sqlite3"
 	_ "github.com/ncruces/go-sqlite3/embed"
 	"github.com/ncruces/go-sqlite3/ext/statement"
+	_ "github.com/ncruces/go-sqlite3/tests/testcfg"
 )
 
 func Example() {
diff --git a/internal/util/mmap.go b/internal/util/mmap.go
index 8265800..d0f14a2 100644
--- a/internal/util/mmap.go
+++ b/internal/util/mmap.go
@@ -1,4 +1,4 @@
-//go:build (darwin || linux || illumos) && (amd64 || arm64 || riscv64) && !sqlite3_flock && !sqlite3_noshm && !sqlite3_nosys
+//go:build (darwin || linux) && (amd64 || arm64 || riscv64) && !(sqlite3_flock || sqlite3_noshm || sqlite3_nosys)
 
 package util
 
diff --git a/internal/util/mmap_other.go b/internal/util/mmap_other.go
index 2e89f80..05c44cf 100644
--- a/internal/util/mmap_other.go
+++ b/internal/util/mmap_other.go
@@ -1,4 +1,4 @@
-//go:build !(darwin || linux || illumos) || !(amd64 || arm64 || riscv64) || sqlite3_flock || sqlite3_noshm || sqlite3_nosys
+//go:build !(darwin || linux) || !(amd64 || arm64 || riscv64) || sqlite3_flock || sqlite3_noshm || sqlite3_nosys
 
 package util
 
diff --git a/sqlite_test.go b/sqlite_test.go
index 99538ea..88dc877 100644
--- a/sqlite_test.go
+++ b/sqlite_test.go
@@ -7,10 +7,12 @@ import (
 	"testing"
 
 	"github.com/ncruces/go-sqlite3/internal/util"
+	"github.com/tetratelabs/wazero"
 )
 
 func init() {
 	Path = "./embed/sqlite3.wasm"
+	RuntimeConfig = wazero.NewRuntimeConfig().WithMemoryLimitPages(1024)
 }
 
 func Test_sqlite_error_OOM(t *testing.T) {
diff --git a/vfs/README.md b/vfs/README.md
index a8fe2d4..9730f14 100644
--- a/vfs/README.md
+++ b/vfs/README.md
@@ -17,7 +17,7 @@ The main differences are [file locking](#file-locking) and [WAL mode](write-ahea
 POSIX advisory locks, which SQLite uses on Unix, are
 [broken by design](https://sqlite.org/src/artifact/2e8b12?ln=1073-1161).
 
-On Linux, macOS and illumos, this module uses
+On Linux and macOS, this module uses
 [OFD locks](https://www.gnu.org/software/libc/manual/html_node/Open-File-Description-Locks.html)
 to synchronize access to database files.
 OFD locks are fully compatible with POSIX advisory locks.
@@ -45,7 +45,7 @@ to check if your platform supports file locking.
 
 ### Write-Ahead Logging
 
-On 64-bit Linux, macOS and illumos, this module uses `mmap` to implement
+On 64-bit Linux and macOS, this module uses `mmap` to implement
 [shared-memory for the WAL-index](https://sqlite.org/wal.html#implementation_of_shared_memory_for_the_wal_index),
 like SQLite.
 
@@ -69,7 +69,7 @@ to check if your platform supports shared memory.
 ### Batch-Atomic Write
 
 On 64-bit Linux, this module supports [batch-atomic writes](https://sqlite.org/cgi/src/technote/714)
-on the F2FS filesystem.
+with the F2FS filesystem.
 
 ### Build tags
 
diff --git a/vfs/memdb/memdb_test.go b/vfs/memdb/memdb_test.go
index eec7bb1..2d1ed30 100644
--- a/vfs/memdb/memdb_test.go
+++ b/vfs/memdb/memdb_test.go
@@ -7,6 +7,7 @@ import (
 
 	"github.com/ncruces/go-sqlite3"
 	_ "github.com/ncruces/go-sqlite3/embed"
+	_ "github.com/ncruces/go-sqlite3/tests/testcfg"
 )
 
 //go:embed testdata/wal.db
diff --git a/vfs/os_bsd.go b/vfs/os_bsd.go
index f2b5527..48ac5c9 100644
--- a/vfs/os_bsd.go
+++ b/vfs/os_bsd.go
@@ -1,4 +1,4 @@
-//go:build (freebsd || openbsd || netbsd || dragonfly || sqlite3_flock) && !sqlite3_nosys
+//go:build (freebsd || openbsd || netbsd || dragonfly || illumos || sqlite3_flock) && !sqlite3_nosys
 
 package vfs
 
diff --git a/vfs/os_linux.go b/vfs/os_linux.go
index a0484eb..8a43f43 100644
--- a/vfs/os_linux.go
+++ b/vfs/os_linux.go
@@ -3,7 +3,9 @@
 package vfs
 
 import (
+	"math/rand"
 	"os"
+	"time"
 
 	"golang.org/x/sys/unix"
 )
@@ -19,3 +21,51 @@ func osAllocate(file *os.File, size int64) error {
 	}
 	return unix.Fallocate(int(file.Fd()), 0, 0, size)
 }
+
+func osUnlock(file *os.File, start, len int64) _ErrorCode {
+	err := unix.FcntlFlock(file.Fd(), unix.F_OFD_SETLK, &unix.Flock_t{
+		Type:  unix.F_UNLCK,
+		Start: start,
+		Len:   len,
+	})
+	if err != nil {
+		return _IOERR_UNLOCK
+	}
+	return _OK
+}
+
+func osLock(file *os.File, typ int16, start, len int64, timeout time.Duration, def _ErrorCode) _ErrorCode {
+	lock := unix.Flock_t{
+		Type:  typ,
+		Start: start,
+		Len:   len,
+	}
+	var err error
+	switch {
+	case timeout == 0:
+		err = unix.FcntlFlock(file.Fd(), unix.F_OFD_SETLK, &lock)
+	case timeout < 0:
+		err = unix.FcntlFlock(file.Fd(), unix.F_OFD_SETLKW, &lock)
+	default:
+		before := time.Now()
+		for {
+			err = unix.FcntlFlock(file.Fd(), unix.F_OFD_SETLK, &lock)
+			if errno, _ := err.(unix.Errno); errno != unix.EAGAIN {
+				break
+			}
+			if timeout < time.Since(before) {
+				break
+			}
+			osSleep(time.Duration(rand.Int63n(int64(time.Millisecond))))
+		}
+	}
+	return osLockErrorCode(err, def)
+}
+
+func osReadLock(file *os.File, start, len int64, timeout time.Duration) _ErrorCode {
+	return osLock(file, unix.F_RDLCK, start, len, timeout, _IOERR_RDLOCK)
+}
+
+func osWriteLock(file *os.File, start, len int64, timeout time.Duration) _ErrorCode {
+	return osLock(file, unix.F_WRLCK, start, len, timeout, _IOERR_LOCK)
+}
diff --git a/vfs/os_ofd.go b/vfs/os_ofd.go
deleted file mode 100644
index 0fe64d8..0000000
--- a/vfs/os_ofd.go
+++ /dev/null
@@ -1,59 +0,0 @@
-//go:build (linux || illumos) && !sqlite3_nosys
-
-package vfs
-
-import (
-	"math/rand"
-	"os"
-	"time"
-
-	"golang.org/x/sys/unix"
-)
-
-func osUnlock(file *os.File, start, len int64) _ErrorCode {
-	err := unix.FcntlFlock(file.Fd(), unix.F_OFD_SETLK, &unix.Flock_t{
-		Type:  unix.F_UNLCK,
-		Start: start,
-		Len:   len,
-	})
-	if err != nil {
-		return _IOERR_UNLOCK
-	}
-	return _OK
-}
-
-func osLock(file *os.File, typ int16, start, len int64, timeout time.Duration, def _ErrorCode) _ErrorCode {
-	lock := unix.Flock_t{
-		Type:  typ,
-		Start: start,
-		Len:   len,
-	}
-	var err error
-	switch {
-	case timeout == 0:
-		err = unix.FcntlFlock(file.Fd(), unix.F_OFD_SETLK, &lock)
-	case timeout < 0:
-		err = unix.FcntlFlock(file.Fd(), unix.F_OFD_SETLKW, &lock)
-	default:
-		before := time.Now()
-		for {
-			err = unix.FcntlFlock(file.Fd(), unix.F_OFD_SETLK, &lock)
-			if errno, _ := err.(unix.Errno); errno != unix.EAGAIN {
-				break
-			}
-			if timeout < time.Since(before) {
-				break
-			}
-			osSleep(time.Duration(rand.Int63n(int64(time.Millisecond))))
-		}
-	}
-	return osLockErrorCode(err, def)
-}
-
-func osReadLock(file *os.File, start, len int64, timeout time.Duration) _ErrorCode {
-	return osLock(file, unix.F_RDLCK, start, len, timeout, _IOERR_RDLOCK)
-}
-
-func osWriteLock(file *os.File, start, len int64, timeout time.Duration) _ErrorCode {
-	return osLock(file, unix.F_WRLCK, start, len, timeout, _IOERR_LOCK)
-}
diff --git a/vfs/shm.go b/vfs/shm.go
index 0b3c655..67d71b6 100644
--- a/vfs/shm.go
+++ b/vfs/shm.go
@@ -1,4 +1,4 @@
-//go:build (darwin || linux || illumos) && (amd64 || arm64 || riscv64) && !sqlite3_flock && !sqlite3_noshm && !sqlite3_nosys
+//go:build (darwin || linux) && (amd64 || arm64 || riscv64) && !(sqlite3_flock || sqlite3_noshm || sqlite3_nosys)
 
 package vfs
 
diff --git a/vfs/shm_other.go b/vfs/shm_other.go
index de11ce4..b51dc53 100644
--- a/vfs/shm_other.go
+++ b/vfs/shm_other.go
@@ -1,4 +1,4 @@
-//go:build !(darwin || linux || illumos) || !(amd64 || arm64 || riscv64) || sqlite3_flock || sqlite3_noshm || sqlite3_nosys
+//go:build !(darwin || linux) || !(amd64 || arm64 || riscv64) || sqlite3_flock || sqlite3_noshm || sqlite3_nosys
 
 package vfs