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-rw-r--r--gnu/local.mk1
-rw-r--r--gnu/packages/kde.scm2
-rw-r--r--gnu/packages/patches/qtbase-fix-krita-deadlock.patch110
-rw-r--r--gnu/packages/qt.scm10
4 files changed, 122 insertions, 1 deletions
diff --git a/gnu/local.mk b/gnu/local.mk
index 139c17e751..2c0d5076d3 100644
--- a/gnu/local.mk
+++ b/gnu/local.mk
@@ -1489,6 +1489,7 @@ dist_patch_DATA = \
%D%/packages/patches/qrcodegen-cpp-make-install.patch \
%D%/packages/patches/qt4-ldflags.patch \
%D%/packages/patches/qtbase-absolute-runpath.patch \
+ %D%/packages/patches/qtbase-fix-krita-deadlock.patch \
%D%/packages/patches/qtbase-moc-ignore-gcc-macro.patch \
%D%/packages/patches/qtbase-use-TZDIR.patch \
%D%/packages/patches/qtscript-disable-tests.patch \
diff --git a/gnu/packages/kde.scm b/gnu/packages/kde.scm
index 9a80e362b6..333dd483cb 100644
--- a/gnu/packages/kde.scm
+++ b/gnu/packages/kde.scm
@@ -434,7 +434,7 @@ illustrate project schedules.")
("openexr" ,openexr)
("perl" ,perl)
("poppler-qt5" ,poppler-qt5)
- ("qtbase" ,qtbase)
+ ("qtbase" ,qtbase-for-krita)
("qtdeclarative" ,qtdeclarative)
("qtmultimedia" ,qtmultimedia)
("qtsvg" ,qtsvg)
diff --git a/gnu/packages/patches/qtbase-fix-krita-deadlock.patch b/gnu/packages/patches/qtbase-fix-krita-deadlock.patch
new file mode 100644
index 0000000000..d3554be3c9
--- /dev/null
+++ b/gnu/packages/patches/qtbase-fix-krita-deadlock.patch
@@ -0,0 +1,110 @@
+Fix a deadlock in Krita:
+
+https://bugreports.qt.io/browse/QTBUG-83207
+
+Patch copied from Qt bug tracker:
+
+https://codereview.qt-project.org/c/qt/qtbase/+/296034
+
+From 276fa8383a7535765be7182883ef4aade17ce013 Mon Sep 17 00:00:00 2001
+From: Thiago Macieira <thiago.macieira@intel.com>
+Date: Thu, 02 Apr 2020 12:08:41 -0300
+Subject: [PATCH] QLibrary: fix deadlock caused by fix to QTBUG-39642
+
+Commit ae6f73e8566fa76470937aca737141183929a5ec inserted a mutex around
+the entire load_sys(). We had reasoed that deadlocks would only occur if
+the object creation in instance() recursed into its own instance(),
+which was already a bug. But we had forgotten that dlopen()/
+LoadLibrary() executes initialization code from the module being loaded,
+which could cause a recursion back into the same QPluginLoader or
+QLibrary object. This recursion is benign because the module *is* loaded
+and dlopen()/LoadLibrary() returns the same handle.
+
+[ChangeLog][QtCore][QLibrary and QPluginLoader] Fixed a deadlock that
+would happen if the plugin or library being loaded has load-time
+initialization code (C++ global variables) that recursed back into the
+same QLibrary or QPluginLoader object.
+
+PS: QLibraryPrivate::loadPlugin() updates pluginState outside a mutex
+lock, so pluginState should be made an atomic variable. Once that is
+done, we'll only need locking the mutex to update errorString (no
+locking before loading).
+
+Fixes: QTBUG-83207
+Task-number: QTBUG-39642
+Change-Id: Ibdc95e9af7bd456a94ecfffd160209304e5ab2eb
+Reviewed-by: Volker Hilsheimer <volker.hilsheimer@qt.io>
+Reviewed-by: David Faure <david.faure@kdab.com>
+---
+
+diff --git a/src/corelib/plugin/qlibrary.cpp b/src/corelib/plugin/qlibrary.cpp
+index ddb053c..be9d92b 100644
+--- a/src/corelib/plugin/qlibrary.cpp
++++ b/src/corelib/plugin/qlibrary.cpp
+@@ -576,9 +576,7 @@
+
+ Q_TRACE(QLibraryPrivate_load_entry, fileName);
+
+- mutex.lock();
+ bool ret = load_sys();
+- mutex.unlock();
+ if (qt_debug_component()) {
+ if (ret) {
+ qDebug() << "loaded library" << fileName;
+diff --git a/src/corelib/plugin/qlibrary_unix.cpp b/src/corelib/plugin/qlibrary_unix.cpp
+index 017aa97..a5c72f8 100644
+--- a/src/corelib/plugin/qlibrary_unix.cpp
++++ b/src/corelib/plugin/qlibrary_unix.cpp
+@@ -123,6 +123,7 @@
+
+ bool QLibraryPrivate::load_sys()
+ {
++ QMutexLocker locker(&mutex);
+ QString attempt;
+ QFileSystemEntry fsEntry(fileName);
+
+@@ -213,6 +214,7 @@
+ }
+ #endif
+
++ locker.unlock();
+ bool retry = true;
+ Handle hnd = nullptr;
+ for (int prefix = 0; retry && !hnd && prefix < prefixes.size(); prefix++) {
+@@ -273,6 +275,8 @@
+ }
+ }
+ #endif
++
++ locker.relock();
+ if (!hnd) {
+ errorString = QLibrary::tr("Cannot load library %1: %2").arg(fileName, qdlerror());
+ }
+diff --git a/src/corelib/plugin/qlibrary_win.cpp b/src/corelib/plugin/qlibrary_win.cpp
+index 000bf76..ef58724 100644
+--- a/src/corelib/plugin/qlibrary_win.cpp
++++ b/src/corelib/plugin/qlibrary_win.cpp
+@@ -78,6 +78,7 @@
+ // fileName
+ //
+ // NB If it's a plugin we do not ever try the ".dll" extension
++ QMutexLocker locker(&mutex);
+ QStringList attempts;
+
+ if (pluginState != IsAPlugin)
+@@ -95,6 +96,7 @@
+ attempts.prepend(QDir::rootPath() + fileName);
+ #endif
+
++ locker.unlock();
+ Handle hnd = nullptr;
+ for (const QString &attempt : qAsConst(attempts)) {
+ #ifndef Q_OS_WINRT
+@@ -115,6 +117,7 @@
+ #ifndef Q_OS_WINRT
+ SetErrorMode(oldmode);
+ #endif
++ locker.relock();
+ if (!hnd) {
+ errorString = QLibrary::tr("Cannot load library %1: %2").arg(
+ QDir::toNativeSeparators(fileName), qt_error_string());
diff --git a/gnu/packages/qt.scm b/gnu/packages/qt.scm
index 0cb36427a0..1cbf7991ab 100644
--- a/gnu/packages/qt.scm
+++ b/gnu/packages/qt.scm
@@ -342,6 +342,7 @@ developers using C++ or QML, a CSS & JavaScript like language.")
(define-public qtbase
(package
(name "qtbase")
+ ;; TODO Remove ((gnu packages kde) qtbase-for-krita) when upgrading qtbase.
(version "5.14.2")
(source (origin
(method url-fetch)
@@ -608,6 +609,15 @@ developers using C++ or QML, a CSS & JavaScript like language.")
(patches (append (origin-patches (package-source qtbase))
(search-patches "qtbase-absolute-runpath.patch")))))))
+(define-public qtbase-for-krita
+ (hidden-package
+ (package
+ (inherit qtbase)
+ (source (origin
+ (inherit (package-source qtbase))
+ (patches (append (origin-patches (package-source qtbase))
+ (search-patches "qtbase-fix-krita-deadlock.patch"))))))))
+
(define-public qtsvg
(package (inherit qtbase)
(name "qtsvg")