diff --git a/src/Symfony/Component/Cache/Adapter/TraceableAdapter.php b/src/Symfony/Component/Cache/Adapter/TraceableAdapter.php
index 48b12d36f9..99e74f2dc7 100644
--- a/src/Symfony/Component/Cache/Adapter/TraceableAdapter.php
+++ b/src/Symfony/Component/Cache/Adapter/TraceableAdapter.php
@@ -244,15 +244,11 @@ class TraceableAdapter implements AdapterInterface, CacheInterface, PruneableInt
      */
     public function reset()
     {
-        if (!$this->pool instanceof ResetInterface) {
-            return;
-        }
-        $event = $this->start(__FUNCTION__);
-        try {
+        if ($this->pool instanceof ResetInterface) {
             $this->pool->reset();
-        } finally {
-            $event->end = microtime(true);
         }
+
+        $this->clearCalls();
     }
 
     /**
diff --git a/src/Symfony/Component/Form/Extension/Validator/Constraints/FormValidator.php b/src/Symfony/Component/Form/Extension/Validator/Constraints/FormValidator.php
index e540d42990..9454adb068 100644
--- a/src/Symfony/Component/Form/Extension/Validator/Constraints/FormValidator.php
+++ b/src/Symfony/Component/Form/Extension/Validator/Constraints/FormValidator.php
@@ -24,6 +24,8 @@ use Symfony\Component\Validator\Exception\UnexpectedTypeException;
  */
 class FormValidator extends ConstraintValidator
 {
+    private $resolvedGroups;
+
     /**
      * {@inheritdoc}
      */
@@ -44,44 +46,70 @@ class FormValidator extends ConstraintValidator
 
         if ($form->isSubmitted() && $form->isSynchronized()) {
             // Validate the form data only if transformation succeeded
-            $groups = self::getValidationGroups($form);
+            $groups = $this->getValidationGroups($form);
 
             if (!$groups) {
                 return;
             }
 
             $data = $form->getData();
-
             // Validate the data against its own constraints
-            if ($form->isRoot() && (\is_object($data) || \is_array($data))) {
-                if (($groups && \is_array($groups)) || ($groups instanceof GroupSequence && $groups->groups)) {
-                    $validator->atPath('data')->validate($form->getData(), null, $groups);
-                }
-            }
+            $validateDataGraph = $form->isRoot()
+                && (\is_object($data) || \is_array($data))
+                && (($groups && \is_array($groups)) || ($groups instanceof GroupSequence && $groups->groups))
+            ;
 
-            // Validate the data against the constraints defined
-            // in the form
+            // Validate the data against the constraints defined in the form
+            /** @var Constraint[] $constraints */
             $constraints = $config->getOption('constraints', []);
 
             if ($groups instanceof GroupSequence) {
-                $validator->atPath('data')->validate($form->getData(), $constraints, $groups);
-                // Otherwise validate a constraint only once for the first
-                // matching group
-                foreach ($groups as $group) {
-                    if (\in_array($group, $formConstraint->groups)) {
-                        $validator->atPath('data')->validate($form->getData(), $formConstraint, $group);
-                        if (\count($this->context->getViolations()) > 0) {
-                            break;
+                // Validate the data, the form AND nested fields in sequence
+                $violationsCount = $this->context->getViolations()->count();
+                $fieldPropertyPath = \is_object($data) ? 'children[%s]' : 'children%s';
+                $hasChildren = $form->count() > 0;
+                $this->resolvedGroups = $hasChildren ? new \SplObjectStorage() : null;
+
+                foreach ($groups->groups as $group) {
+                    if ($validateDataGraph) {
+                        $validator->atPath('data')->validate($data, null, $group);
+                    }
+
+                    if ($groupedConstraints = self::getConstraintsInGroups($constraints, $group)) {
+                        $validator->atPath('data')->validate($data, $groupedConstraints, $group);
+                    }
+
+                    foreach ($form->all() as $field) {
+                        if ($field->isSubmitted()) {
+                            // remember to validate this field is one group only
+                            // otherwise resolving the groups would reuse the same
+                            // sequence recursively, thus some fields could fail
+                            // in different steps without breaking early enough
+                            $this->resolvedGroups[$field] = (array) $group;
+                            $validator->atPath(sprintf($fieldPropertyPath, $field->getPropertyPath()))->validate($field, $formConstraint);
                         }
                     }
+
+                    if ($violationsCount < $this->context->getViolations()->count()) {
+                        break;
+                    }
+                }
+
+                if ($hasChildren) {
+                    // destroy storage at the end of the sequence to avoid memory leaks
+                    $this->resolvedGroups = null;
                 }
             } else {
+                if ($validateDataGraph) {
+                    $validator->atPath('data')->validate($data, null, $groups);
+                }
+
                 $groupedConstraints = [];
 
                 foreach ($constraints as $constraint) {
                     // For the "Valid" constraint, validate the data in all groups
                     if ($constraint instanceof Valid) {
-                        $validator->atPath('data')->validate($form->getData(), $constraint, $groups);
+                        $validator->atPath('data')->validate($data, $constraint, $groups);
 
                         continue;
                     }
@@ -101,7 +129,7 @@ class FormValidator extends ConstraintValidator
                 }
 
                 foreach ($groupedConstraints as $group => $constraint) {
-                    $validator->atPath('data')->validate($form->getData(), $constraint, $group);
+                    $validator->atPath('data')->validate($data, $constraint, $group);
                 }
             }
         } elseif (!$form->isSynchronized()) {
@@ -160,7 +188,7 @@ class FormValidator extends ConstraintValidator
      *
      * @return string|GroupSequence|(string|GroupSequence)[] The validation groups
      */
-    private static function getValidationGroups(FormInterface $form)
+    private function getValidationGroups(FormInterface $form)
     {
         // Determine the clicked button of the complete form tree
         $clickedButton = null;
@@ -184,6 +212,10 @@ class FormValidator extends ConstraintValidator
                 return self::resolveValidationGroups($groups, $form);
             }
 
+            if (isset($this->resolvedGroups[$form])) {
+                return $this->resolvedGroups[$form];
+            }
+
             $form = $form->getParent();
         } while (null !== $form);
 
@@ -209,4 +241,11 @@ class FormValidator extends ConstraintValidator
 
         return (array) $groups;
     }
+
+    private static function getConstraintsInGroups($constraints, $group)
+    {
+        return array_filter($constraints, static function (Constraint $constraint) use ($group) {
+            return \in_array($group, $constraint->groups, true);
+        });
+    }
 }
diff --git a/src/Symfony/Component/Form/Resources/config/validation.xml b/src/Symfony/Component/Form/Resources/config/validation.xml
index cbd586b915..b2b935442d 100644
--- a/src/Symfony/Component/Form/Resources/config/validation.xml
+++ b/src/Symfony/Component/Form/Resources/config/validation.xml
@@ -7,7 +7,7 @@
   <class name="Symfony\Component\Form\Form">
     <constraint name="Symfony\Component\Form\Extension\Validator\Constraints\Form" />
     <property name="children">
-        <constraint name="Valid" />
+      <constraint name="Valid" />
     </property>
   </class>
 </constraint-mapping>
diff --git a/src/Symfony/Component/Form/Tests/Extension/Validator/Constraints/FormValidatorTest.php b/src/Symfony/Component/Form/Tests/Extension/Validator/Constraints/FormValidatorTest.php
index fcfefc3449..ea216673f0 100644
--- a/src/Symfony/Component/Form/Tests/Extension/Validator/Constraints/FormValidatorTest.php
+++ b/src/Symfony/Component/Form/Tests/Extension/Validator/Constraints/FormValidatorTest.php
@@ -444,8 +444,8 @@ class FormValidatorTest extends ConstraintValidatorTestCase
         $form = $this->getCompoundForm($object, $options);
         $form->submit([]);
 
-        $this->expectValidateAt(0, 'data', $object, new GroupSequence(['group1', 'group2']));
-        $this->expectValidateAt(1, 'data', $object, new GroupSequence(['group1', 'group2']));
+        $this->expectValidateAt(0, 'data', $object, 'group1');
+        $this->expectValidateAt(1, 'data', $object, 'group2');
 
         $this->validator->validate($form, new Form());
 
@@ -801,6 +801,39 @@ class FormValidatorTest extends ConstraintValidatorTestCase
         $this->assertSame('data[field2]', $context->getViolations()[1]->getPropertyPath());
     }
 
+    public function testCompositeConstraintValidatedInSequence()
+    {
+        $form = $this->getCompoundForm([], [
+            'constraints' => [
+                new Collection([
+                    'field1' => new NotBlank([
+                        'groups' => ['field1'],
+                    ]),
+                    'field2' => new NotBlank([
+                        'groups' => ['field2'],
+                    ]),
+                ]),
+            ],
+            'validation_groups' => new GroupSequence(['field1', 'field2']),
+        ])
+            ->add($this->getForm('field1'))
+            ->add($this->getForm('field2'))
+        ;
+
+        $form->submit([
+            'field1' => '',
+            'field2' => '',
+        ]);
+
+        $context = new ExecutionContext(Validation::createValidator(), $form, new IdentityTranslator());
+        $this->validator->initialize($context);
+        $this->validator->validate($form, new Form());
+
+        $this->assertCount(1, $context->getViolations());
+        $this->assertSame('This value should not be blank.', $context->getViolations()[0]->getMessage());
+        $this->assertSame('data[field1]', $context->getViolations()[0]->getPropertyPath());
+    }
+
     protected function createValidator()
     {
         return new FormValidator();
@@ -823,7 +856,7 @@ class FormValidatorTest extends ConstraintValidatorTestCase
 
     private function getCompoundForm($data, array $options = [])
     {
-        return $this->getBuilder('name', \get_class($data), $options)
+        return $this->getBuilder('name', \is_object($data) ? \get_class($data) : null, $options)
             ->setData($data)
             ->setCompound(true)
             ->setDataMapper(new PropertyPathMapper())
diff --git a/src/Symfony/Component/Form/Tests/Extension/Validator/Type/FormTypeValidatorExtensionTest.php b/src/Symfony/Component/Form/Tests/Extension/Validator/Type/FormTypeValidatorExtensionTest.php
index b0b945e845..598687e1a2 100644
--- a/src/Symfony/Component/Form/Tests/Extension/Validator/Type/FormTypeValidatorExtensionTest.php
+++ b/src/Symfony/Component/Form/Tests/Extension/Validator/Type/FormTypeValidatorExtensionTest.php
@@ -12,15 +12,19 @@
 namespace Symfony\Component\Form\Tests\Extension\Validator\Type;
 
 use Symfony\Component\Form\Extension\Validator\ValidatorExtension;
+use Symfony\Component\Form\Form;
 use Symfony\Component\Form\Forms;
 use Symfony\Component\Form\Test\Traits\ValidatorExtensionTrait;
 use Symfony\Component\Form\Tests\Extension\Core\Type\FormTypeTest;
 use Symfony\Component\Form\Tests\Extension\Core\Type\TextTypeTest;
-use Symfony\Component\Validator\Constraints\Email;
+use Symfony\Component\Form\Tests\Fixtures\Author;
 use Symfony\Component\Validator\Constraints\GroupSequence;
 use Symfony\Component\Validator\Constraints\Length;
+use Symfony\Component\Validator\Constraints\NotBlank;
 use Symfony\Component\Validator\Constraints\Valid;
 use Symfony\Component\Validator\ConstraintViolationList;
+use Symfony\Component\Validator\Mapping\ClassMetadata;
+use Symfony\Component\Validator\Mapping\Factory\MetadataFactoryInterface;
 use Symfony\Component\Validator\Validation;
 
 class FormTypeValidatorExtensionTest extends BaseValidatorExtensionTest
@@ -64,14 +68,71 @@ class FormTypeValidatorExtensionTest extends BaseValidatorExtensionTest
             ->add('field', TextTypeTest::TESTED_TYPE, [
                 'constraints' => [
                     new Length(['min' => 10, 'allowEmptyString' => true, 'groups' => ['First']]),
-                    new Email(['groups' => ['Second']]),
+                    new NotBlank(['groups' => ['Second']]),
                 ],
             ])
         ;
 
         $form->submit(['field' => 'wrong']);
 
-        $this->assertCount(1, $form->getErrors(true));
+        $errors = $form->getErrors(true);
+
+        $this->assertCount(1, $errors);
+        $this->assertInstanceOf(Length::class, $errors[0]->getCause()->getConstraint());
+    }
+
+    public function testManyFieldsGroupSequenceWithConstraintsOption()
+    {
+        $allowEmptyString = property_exists(Length::class, 'allowEmptyString') ? ['allowEmptyString' => true] : [];
+
+        $formMetadata = new ClassMetadata(Form::class);
+        $authorMetadata = (new ClassMetadata(Author::class))
+            ->addPropertyConstraint('firstName', new NotBlank(['groups' => 'Second']))
+        ;
+        $metadataFactory = $this->createMock(MetadataFactoryInterface::class);
+        $metadataFactory->expects($this->any())
+            ->method('getMetadataFor')
+            ->willReturnCallback(static function ($classOrObject) use ($formMetadata, $authorMetadata) {
+                if (Author::class === $classOrObject || $classOrObject instanceof Author) {
+                    return $authorMetadata;
+                }
+
+                if (Form::class === $classOrObject || $classOrObject instanceof Form) {
+                    return $formMetadata;
+                }
+
+                return new ClassMetadata(\is_string($classOrObject) ? $classOrObject : \get_class($classOrObject));
+            })
+        ;
+
+        $validator = Validation::createValidatorBuilder()
+            ->setMetadataFactory($metadataFactory)
+            ->getValidator()
+        ;
+        $form = Forms::createFormFactoryBuilder()
+            ->addExtension(new ValidatorExtension($validator))
+            ->getFormFactory()
+            ->create(FormTypeTest::TESTED_TYPE, new Author(), (['validation_groups' => new GroupSequence(['First', 'Second'])]))
+            ->add('firstName', TextTypeTest::TESTED_TYPE)
+            ->add('lastName', TextTypeTest::TESTED_TYPE, [
+                'constraints' => [
+                    new Length(['min' => 10, 'groups' => ['First']] + $allowEmptyString),
+                ],
+            ])
+            ->add('australian', TextTypeTest::TESTED_TYPE, [
+                'constraints' => [
+                    new NotBlank(['groups' => ['Second']]),
+                ],
+            ])
+        ;
+
+        $form->submit(['firstName' => '', 'lastName' => 'wrong_1', 'australian' => '']);
+
+        $errors = $form->getErrors(true);
+
+        $this->assertCount(1, $errors);
+        $this->assertInstanceOf(Length::class, $errors[0]->getCause()->getConstraint());
+        $this->assertSame('children[lastName].data', $errors[0]->getCause()->getPropertyPath());
     }
 
     protected function createForm(array $options = [])
diff --git a/src/Symfony/Component/Form/Tests/Extension/Validator/ValidatorExtensionTest.php b/src/Symfony/Component/Form/Tests/Extension/Validator/ValidatorExtensionTest.php
index 136086a5e5..383b7556d5 100644
--- a/src/Symfony/Component/Form/Tests/Extension/Validator/ValidatorExtensionTest.php
+++ b/src/Symfony/Component/Form/Tests/Extension/Validator/ValidatorExtensionTest.php
@@ -13,6 +13,8 @@ namespace Symfony\Component\Form\Tests\Extension\Validator;
 
 use PHPUnit\Framework\TestCase;
 use Symfony\Component\Form\AbstractType;
+use Symfony\Component\Form\Extension\Core\Type\FormType;
+use Symfony\Component\Form\Extension\Core\Type\TextType;
 use Symfony\Component\Form\Extension\Validator\Constraints\Form as FormConstraint;
 use Symfony\Component\Form\Extension\Validator\ValidatorExtension;
 use Symfony\Component\Form\Extension\Validator\ValidatorTypeGuesser;
@@ -20,6 +22,8 @@ use Symfony\Component\Form\Form;
 use Symfony\Component\Form\FormBuilderInterface;
 use Symfony\Component\Form\FormFactoryBuilder;
 use Symfony\Component\OptionsResolver\OptionsResolver;
+use Symfony\Component\Validator\Constraints\GroupSequence;
+use Symfony\Component\Validator\Constraints\Length;
 use Symfony\Component\Validator\Constraints\NotBlank;
 use Symfony\Component\Validator\Mapping\CascadingStrategy;
 use Symfony\Component\Validator\Mapping\ClassMetadata;
@@ -49,6 +53,8 @@ class ValidatorExtensionTest extends TestCase
         $this->assertCount(1, $metadata->getConstraints());
         $this->assertInstanceOf(FormConstraint::class, $metadata->getConstraints()[0]);
 
+        $this->assertSame(CascadingStrategy::NONE, $metadata->cascadingStrategy);
+        $this->assertSame(TraversalStrategy::IMPLICIT, $metadata->traversalStrategy);
         $this->assertSame(CascadingStrategy::CASCADE, $metadata->getPropertyMetadata('children')[0]->cascadingStrategy);
         $this->assertSame(TraversalStrategy::IMPLICIT, $metadata->getPropertyMetadata('children')[0]->traversalStrategy);
     }
@@ -86,7 +92,57 @@ class ValidatorExtensionTest extends TestCase
         $this->assertFalse($form->get('baz')->isValid());
     }
 
-    private function createForm($type)
+    public function testFieldsValidateInSequence()
+    {
+        $allowEmptyString = property_exists(Length::class, 'allowEmptyString') ? ['allowEmptyString' => true] : [];
+
+        $form = $this->createForm(FormType::class, null, [
+            'validation_groups' => new GroupSequence(['group1', 'group2']),
+        ])
+            ->add('foo', TextType::class, [
+                'constraints' => [new Length(['min' => 10, 'groups' => ['group1']] + $allowEmptyString)],
+            ])
+            ->add('bar', TextType::class, [
+                'constraints' => [new NotBlank(['groups' => ['group2']])],
+            ])
+        ;
+
+        $form->submit(['foo' => 'invalid', 'bar' => null]);
+
+        $errors = $form->getErrors(true);
+
+        $this->assertCount(1, $errors);
+        $this->assertInstanceOf(Length::class, $errors[0]->getCause()->getConstraint());
+    }
+
+    public function testFieldsValidateInSequenceWithNestedGroupsArray()
+    {
+        $allowEmptyString = property_exists(Length::class, 'allowEmptyString') ? ['allowEmptyString' => true] : [];
+
+        $form = $this->createForm(FormType::class, null, [
+            'validation_groups' => new GroupSequence([['group1', 'group2'], 'group3']),
+        ])
+            ->add('foo', TextType::class, [
+                'constraints' => [new Length(['min' => 10, 'groups' => ['group1']] + $allowEmptyString)],
+            ])
+            ->add('bar', TextType::class, [
+                'constraints' => [new Length(['min' => 10, 'groups' => ['group2']] + $allowEmptyString)],
+            ])
+            ->add('baz', TextType::class, [
+                'constraints' => [new NotBlank(['groups' => ['group3']])],
+            ])
+        ;
+
+        $form->submit(['foo' => 'invalid', 'bar' => 'invalid', 'baz' => null]);
+
+        $errors = $form->getErrors(true);
+
+        $this->assertCount(2, $errors);
+        $this->assertInstanceOf(Length::class, $errors[0]->getCause()->getConstraint());
+        $this->assertInstanceOf(Length::class, $errors[1]->getCause()->getConstraint());
+    }
+
+    private function createForm($type, $data = null, array $options = [])
     {
         $validator = Validation::createValidatorBuilder()
             ->setMetadataFactory(new LazyLoadingMetadataFactory(new StaticMethodLoader()))
@@ -95,7 +151,7 @@ class ValidatorExtensionTest extends TestCase
         $formFactoryBuilder->addExtension(new ValidatorExtension($validator));
         $formFactory = $formFactoryBuilder->getFormFactory();
 
-        return $formFactory->create($type);
+        return $formFactory->create($type, $data, $options);
     }
 }
 
diff --git a/src/Symfony/Component/HttpFoundation/Session/Storage/Handler/AbstractSessionHandler.php b/src/Symfony/Component/HttpFoundation/Session/Storage/Handler/AbstractSessionHandler.php
index bd151669c8..15b3ba0df4 100644
--- a/src/Symfony/Component/HttpFoundation/Session/Storage/Handler/AbstractSessionHandler.php
+++ b/src/Symfony/Component/HttpFoundation/Session/Storage/Handler/AbstractSessionHandler.php
@@ -64,6 +64,15 @@ abstract class AbstractSessionHandler implements \SessionHandlerInterface, \Sess
         $this->prefetchData = $this->read($sessionId);
         $this->prefetchId = $sessionId;
 
+        if (\PHP_VERSION_ID < 70317 || (70400 <= \PHP_VERSION_ID && \PHP_VERSION_ID < 70405)) {
+            // work around https://bugs.php.net/79413
+            foreach (debug_backtrace(DEBUG_BACKTRACE_IGNORE_ARGS) as $frame) {
+                if (!isset($frame['class']) && isset($frame['function']) && \in_array($frame['function'], ['session_regenerate_id', 'session_create_id'], true)) {
+                    return '' === $this->prefetchData;
+                }
+            }
+        }
+
         return '' !== $this->prefetchData;
     }
 
diff --git a/src/Symfony/Component/HttpFoundation/Tests/Session/Storage/Handler/Fixtures/regenerate.expected b/src/Symfony/Component/HttpFoundation/Tests/Session/Storage/Handler/Fixtures/regenerate.expected
index baa5f2f6f5..d825f44f7c 100644
--- a/src/Symfony/Component/HttpFoundation/Tests/Session/Storage/Handler/Fixtures/regenerate.expected
+++ b/src/Symfony/Component/HttpFoundation/Tests/Session/Storage/Handler/Fixtures/regenerate.expected
@@ -11,6 +11,7 @@ validateId
 read
 doRead: abc|i:123;
 read
+doRead: abc|i:123;
 
 write
 doWrite: abc|i:123;
diff --git a/src/Symfony/Component/Mime/Crypto/SMime.php b/src/Symfony/Component/Mime/Crypto/SMime.php
index c6317a6bb1..ad88c1987a 100644
--- a/src/Symfony/Component/Mime/Crypto/SMime.php
+++ b/src/Symfony/Component/Mime/Crypto/SMime.php
@@ -65,7 +65,7 @@ abstract class SMime
     protected function getStreamIterator($stream): iterable
     {
         while (!feof($stream)) {
-            yield fread($stream, 16372);
+            yield str_replace("\n", "\r\n", str_replace("\r\n", "\n", fread($stream, 16372)));
         }
     }
 
diff --git a/src/Symfony/Component/Mime/Tests/Crypto/SMimeEncryptorTest.php b/src/Symfony/Component/Mime/Tests/Crypto/SMimeEncryptorTest.php
index cad87bfab7..92df05e391 100644
--- a/src/Symfony/Component/Mime/Tests/Crypto/SMimeEncryptorTest.php
+++ b/src/Symfony/Component/Mime/Tests/Crypto/SMimeEncryptorTest.php
@@ -87,7 +87,11 @@ class SMimeEncryptorTest extends SMimeTestCase
     private function assertMessageIsEncryptedProperly(Message $message, Message $originalMessage): void
     {
         $messageFile = $this->generateTmpFilename();
-        file_put_contents($messageFile, $message->toString());
+        file_put_contents($messageFile, $messageString = $message->toString());
+
+        // Ensure the proper line-ending is used for compatibility with the RFC
+        $this->assertStringContainsString("\n\r", $messageString);
+        $this->assertStringNotContainsString("\n\n", $messageString);
 
         $outputFile = $this->generateTmpFilename();