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gnu: Fix Krita.

Fixes <https://bugs.gnu.org/42476>.
Reported by linka on #guix.

* gnu/packages/patches/qtbase-fix-krita-deadlock.patch: New file.
* gnu/local.mk (dist_patch_DATA): Add it.
* gnu/packages/kde.scm (qtbase-for-krita): New variable.
(krita)[inputs]: Replace qtbase with qtbase-for-krita.
gn-latest-20200725
Leo Famulari 1 year ago
parent
commit
5f63905096
No known key found for this signature in database GPG Key ID: 2646FA30BACA7F08
  1. 1
      gnu/local.mk
  2. 10
      gnu/packages/kde.scm
  3. 110
      gnu/packages/patches/qtbase-fix-krita-deadlock.patch
  4. 1
      gnu/packages/qt.scm

1
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 \

10
gnu/packages/kde.scm

@ -360,6 +360,14 @@ a module for implementing ODF Gantt charts, which are bar charts that
illustrate project schedules.")
(license license:gpl2+)))
(define qtbase-for-krita
(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 krita
(package
(name "krita")
@ -434,7 +442,7 @@ illustrate project schedules.")
("openexr" ,openexr)
("perl" ,perl)
("poppler-qt5" ,poppler-qt5)
("qtbase" ,qtbase)
("qtbase" ,qtbase-for-krita)
("qtdeclarative" ,qtdeclarative)
("qtmultimedia" ,qtmultimedia)
("qtsvg" ,qtsvg)

110
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());

1
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)

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