Avoid duplicate /dev/shm bind when reusing BrowserWebDriverContainer

modules/selenium/src/main/java/org/testcontainers/containers/BrowserWebDriverContainer.java

@@ -220,7 +220,7 @@ protected void configure() {
         if (getShmSize() == null) {
             if (SystemUtils.IS_OS_WINDOWS) {
                 withSharedMemorySize(512 * FileUtils.ONE_MB);
-            } else {
+            } else if (getBinds().stream().noneMatch(bind -> "/dev/shm".equals(bind.getVolume().getPath()))) {
                 this.getBinds().add(new Bind("/dev/shm", new Volume("/dev/shm"), AccessMode.rw));
             }
         }

modules/selenium/src/main/java/org/testcontainers/selenium/BrowserWebDriverContainer.java

@@ -164,7 +164,7 @@ protected void configure() {
         if (getShmSize() == null) {
             if (SystemUtils.IS_OS_WINDOWS) {
                 withSharedMemorySize(512 * FileUtils.ONE_MB);
-            } else {
+            } else if (getBinds().stream().noneMatch(bind -> "/dev/shm".equals(bind.getVolume().getPath()))) {
                 this.getBinds().add(new Bind("/dev/shm", new Volume("/dev/shm"), AccessMode.rw));
             }
         }

modules/selenium/src/test/java/org/testcontainers/selenium/BrowserWebDriverContainerReuseTest.java

@@ -0,0 +1,34 @@
+package org.testcontainers.selenium;
+
+import com.github.dockerjava.api.model.Bind;
+import org.junit.jupiter.api.Test;
+import org.junit.jupiter.api.condition.DisabledOnOs;
+import org.junit.jupiter.api.condition.OS;
+import org.testcontainers.utility.DockerImageName;
+
+import static org.assertj.core.api.Assertions.assertThat;
+
+class BrowserWebDriverContainerReuseTest {
+
+    private static final DockerImageName CHROME_IMAGE = DockerImageName.parse("selenium/standalone-chrome:4.10.0");
+
+    @Test
+    @DisabledOnOs(OS.WINDOWS)
+    void configureDoesNotAddDuplicateShmBindOnReuse() {
+        BrowserWebDriverContainer container = new BrowserWebDriverContainer(CHROME_IMAGE);
+
+        // configure() runs on every start(), so a reused container that is started
+        // more than once must not accumulate duplicate /dev/shm binds (see #11941).
+        container.configure();
+        container.configure();
+
+        long shmBinds = container
+            .getBinds()
+            .stream()
+            .map(Bind::getVolume)
+            .filter(volume -> "/dev/shm".equals(volume.getPath()))
+            .count();
+
+        assertThat(shmBinds).isEqualTo(1);
+    }
+}