Fix.

.github/workflows/test.yml

@@ -162,8 +162,8 @@ jobs:
     - name: Test ppc64le (interpreter)
       run: GOARCH=ppc64le go test -v -short ./...
 
-    - name: Test s390x (big-endian, z/OS like)
-      run: GOARCH=s390x go test -v -short -tags sqlite3_flock ./...
+    - name: Test s390x (big-endian)
+      run: GOARCH=s390x go test -v -short -tags sqlite3_dotlk ./...
 
   test-vm:
     runs-on: ubuntu-latest

config.go

@@ -2,6 +2,7 @@ package sqlite3
 
 import (
 	"context"
+	"fmt"
 	"strconv"
 
 	"github.com/tetratelabs/wazero/api"
@@ -70,6 +71,15 @@ func logCallback(ctx context.Context, mod api.Module, _, iCode, zMsg uint32) {
 	}
 }
 
+// Log writes a message into the error log established by [Conn.ConfigLog].
+//
+// https://sqlite.org/c3ref/log.html
+func (c *Conn) Log(code ExtendedErrorCode, format string, a ...any) {
+	if c.log != nil {
+		c.log(code, fmt.Sprintf(format, a...))
+	}
+}
+
 // FileControl allows low-level control of database files.
 // Only a subset of opcodes are supported.
 //

error.go

@@ -106,6 +106,11 @@ func (e ErrorCode) Temporary() bool {
 	return e == BUSY
 }
 
+// ExtendedCode returns the extended error code for this error.
+func (e ErrorCode) ExtendedCode() ExtendedErrorCode {
+	return ExtendedErrorCode(e)
+}
+
 // Error implements the error interface.
 func (e ExtendedErrorCode) Error() string {
 	return util.ErrorCodeString(uint32(e))
@@ -136,6 +141,11 @@ func (e ExtendedErrorCode) Timeout() bool {
 	return e == BUSY_TIMEOUT
 }
 
+// Code returns the primary error code for this error.
+func (e ExtendedErrorCode) Code() ErrorCode {
+	return ErrorCode(e)
+}
+
 func errorCode(err error, def ErrorCode) (msg string, code uint32) {
 	switch code := err.(type) {
 	case nil:

tests/config_test.go

@@ -87,9 +87,15 @@ func TestConn_ConfigLog(t *testing.T) {
 
 	db.Prepare(`SELECT * FRM sqlite_schema`)
 
-	if code != sqlite3.ExtendedErrorCode(sqlite3.ERROR) {
+	if code != sqlite3.ERROR.ExtendedCode() {
 		t.Error("want sqlite3.ERROR")
 	}
+
+	db.Log(sqlite3.NOTICE.ExtendedCode(), "")
+
+	if code.Code() != sqlite3.NOTICE {
+		t.Error("want sqlite3.NOTICE")
+	}
 }
 
 func TestConn_FileControl(t *testing.T) {

vfs/shm_dotlk.go

@@ -114,6 +114,7 @@ func (s *vfsShm) shmMap(ctx context.Context, mod api.Module, id, size int32, ext
 	defer s.Unlock()
 	defer s.shmAcquire()
 
+	// Extend shared memory.
 	if int(id) >= len(s.shared) {
 		if !extend {
 			return 0, _OK
@@ -121,10 +122,13 @@ func (s *vfsShm) shmMap(ctx context.Context, mod api.Module, id, size int32, ext
 		s.shared = append(s.shared, make([][_WALINDEX_PGSZ]byte, int(id)-len(s.shared)+1)...)
 	}
 
+	// Allocate shadow memory.
 	if int(id) >= len(s.shadow) {
 		s.shadow = append(s.shadow, make([][_WALINDEX_PGSZ]byte, int(id)-len(s.shadow)+1)...)
+		s.shadow[0][4] = 1 // force invalidation
 	}
 
+	// Allocate local memory.
 	for int(id) >= len(s.ptrs) {
 		s.stack[0] = uint64(size)
 		if err := s.alloc.CallWithStack(ctx, s.stack[:]); err != nil {

vfs/shm_windows.go

@@ -94,21 +94,20 @@ func (s *vfsShm) shmMap(ctx context.Context, mod api.Module, id, size int32, ext
 		}
 	}
 
-	// Map the region into memory.
-	r, err := util.MapRegion(ctx, mod, s.File, int64(id)*int64(size), size)
-	if err != nil {
-		return 0, _IOERR_SHMMAP
+	// Maps regions into memory.
+	for int(id) >= len(s.shared) {
+		r, err := util.MapRegion(ctx, mod, s.File, int64(id)*int64(size), size)
+		if err != nil {
+			return 0, _IOERR_SHMMAP
+		}
+		s.regions = append(s.regions, r)
+		s.shared = append(s.shared, r.Data)
 	}
-	s.regions = append(s.regions, r)
-
-	if int(id) >= len(s.shared) {
-		s.shared = append(s.shared, make([][]byte, int(id)-len(s.shared)+1)...)
-	}
-	s.shared[id] = r.Data
 
 	// Allocate shadow memory.
 	if int(id) >= len(s.shadow) {
 		s.shadow = append(s.shadow, make([][_WALINDEX_PGSZ]byte, int(id)-len(s.shadow)+1)...)
+		s.shadow[0][4] = 1 // force invalidation
 	}
 
 	// Allocate local memory.

vfs/tests/mptest/mptest_test.go

@@ -35,6 +35,8 @@ var compressed string
 //go:embed testdata/*.*test
 var scripts embed.FS
 
+const qemuCI = runtime.GOARCH != "386" && runtime.GOARCH != "amd64" && runtime.GOARCH != "arm64"
+
 var (
 	rt        wazero.Runtime
 	module    wazero.CompiledModule
@@ -160,8 +162,8 @@ func Test_crash01(t *testing.T) {
 }
 
 func Test_multiwrite01(t *testing.T) {
-	if testing.Short() {
-		t.Skip("skipping in short mode")
+	if os.Getenv("CI") != "" && qemuCI {
+		t.Skip("skipping in CI")
 	}
 	if !vfs.SupportsFileLocking {
 		t.Skip("skipping without locks")
@@ -190,8 +192,8 @@ func Test_config01_memory(t *testing.T) {
 }
 
 func Test_multiwrite01_memory(t *testing.T) {
-	if testing.Short() {
-		t.Skip("skipping in short mode")
+	if os.Getenv("CI") != "" && qemuCI {
+		t.Skip("skipping in CI")
 	}
 
 	memdb.Create("test.db", nil)
@@ -225,8 +227,8 @@ func Test_crash01_wal(t *testing.T) {
 }
 
 func Test_multiwrite01_wal(t *testing.T) {
-	if testing.Short() {
-		t.Skip("skipping in short mode")
+	if os.Getenv("CI") != "" && qemuCI {
+		t.Skip("skipping in CI")
 	}
 	if !vfs.SupportsSharedMemory {
 		t.Skip("skipping without shared memory")