QLockFile: fix deadlock when the lock file is corrupted

[ChangeLog][QtCore][QLockFile] Fixed a deadlock when the lock file
is corrupted.

Task-number: QTBUG-44771
Change-Id: Ic490b09d70ff1cc1733b64949889a73720b2d0f3
Reviewed-by: David Faure <david.faure@kdab.com>

1 files changed, 17 insertions, 0 deletions

diff --git a/tests/auto/corelib/io/qlockfile/tst_qlockfile.cpp b/tests/auto/corelib/io/qlockfile/tst_qlockfile.cpp
index 77bef94550..12bea6769c 100644
--- a/tests/auto/corelib/io/qlockfile/tst_qlockfile.cpp
+++ b/tests/auto/corelib/io/qlockfile/tst_qlockfile.cpp
@@ -58,6 +58,7 @@ private slots:
     void staleLongLockFromBusyProcess();
     void staleLockRace();
     void noPermissions();
+    void corruptedLockFile();
 
 public:
     QString m_helperApp;
@@ -415,5 +416,21 @@ void tst_QLockFile::noPermissions()
     QCOMPARE(int(lockFile.error()), int(QLockFile::PermissionError));
 }
 
+void tst_QLockFile::corruptedLockFile()
+{
+    const QString fileName = dir.path() + "/corruptedLockFile";
+
+    {
+        // Create a empty file. Typically the result of a computer crash or hard disk full.
+        QFile file(fileName);
+        QVERIFY(file.open(QFile::WriteOnly));
+    }
+
+    QLockFile secondLock(fileName);
+    secondLock.setStaleLockTime(100);
+    QVERIFY(secondLock.tryLock(10000));
+    QCOMPARE(int(secondLock.error()), int(QLockFile::NoError));
+}
+
 QTEST_MAIN(tst_QLockFile)
 #include "tst_qlockfile.moc"