https://bugs.kde.org/show_bug.cgi?id=468663
Bug ID: 468663
Summary: qdbus-qt5 org.kde.baloo occasionally crashed during
shutdown
Classification: Frameworks and Libraries
Product: frameworks-baloo
Version: 5.104.0
Platform: Fedora RPMs
OS: Linux
Status: REPORTED
Severity: normal
Priority: NOR
Component: general
Assignee: baloo-bugs-n...@kde.org
Reporter: matt.fagn...@bell.net
Target Milestone: ---
Created attachment 158197
--> https://bugs.kde.org/attachment.cgi?id=158197&action=edit
Full trace of all threads of qdbus-qt5 org.kde.baloo crash
SUMMARY
I've seen qdbus-qt5 org.kde.baloo crash twice during shutdown from Plasma on
Wayland. The first such crash was with Plasma 5.26.5 on Wayland, KF 5.101.0, Qt
5.15.8 in Fedora 37. The second crash was with Plasma 5.27.4 on Wayland, KF
5.104.0, Qt 5.15.9 in Fedora 38. Both crashes had the same sort of trace. Frame
#0 had ?? instead of the function name and frame #1 had QMetaType::destruct.
The following trace was for the second crash.
Using host libthread_db library "/lib64/libthread_db.so.1".
Core was generated by `qdbus-qt5 org.kde.baloo'.
--Type <RET> for more, q to quit, c to continue without paging--c
Missing separate debuginfos, use: dnf debuginfo-install
qt5-qttools-5.15.9-1.fc38.x86_64
Program terminated with signal SIGSEGV, Segmentation fault.
#0 0x0000010700000008 in ?? ()
[Current thread is 1 (Thread 0x7f0fd25ff6c0 (LWP 9610))]
(gdb) bt
#0 0x0000010700000008 in ?? ()
#1 0x00007f0fe2cc85db in QMetaType::destruct (data=0x55a076b87800,
this=0x7f0fd25fe900)
at kernel/qmetatype.h:2372
#2 QMetaType::destroy (type=<optimized out>, data=0x55a076b87800) at
kernel/qmetatype.cpp:1664
#3 0x00007f0fe2cdbb77 in QMetaCallEvent::~QMetaCallEvent (this=0x55a076b876d0,
__in_chrg=<optimized out>) at kernel/qobject.cpp:618
#4 0x00007f0fe2cdbbe5 in QMetaCallEvent::~QMetaCallEvent (this=0x55a076b876d0,
__in_chrg=<optimized out>) at kernel/qobject.cpp:625
#5 0x00007f0fe2cb71ff in QScopedPointerDeleter<QEvent>::cleanup
(pointer=0x55a076b876d0)
at ../../include/QtCore/../../src/corelib/tools/qscopedpointer.h:52
#6 QScopedPointer<QEvent, QScopedPointerDeleter<QEvent> >::~QScopedPointer
(this=0x7f0fd25fea10,
__in_chrg=<optimized out>) at
../../include/QtCore/../../src/corelib/tools/qscopedpointer.h:107
#7 QCoreApplicationPrivate::sendPostedEvents (receiver=0x0, event_type=0,
data=0x55a076b87280)
at kernel/qcoreapplication.cpp:1826
#8 0x00007f0fe2cb74ad in QCoreApplication::sendPostedEvents
(receiver=<optimized out>,
event_type=<optimized out>) at kernel/qcoreapplication.cpp:1680
#9 0x00007f0fe2d06e2f in postEventSourceDispatch (s=0x7f0fcc000ee0)
at kernel/qeventdispatcher_glib.cpp:277
#10 0x00007f0fe1f0bf58 in g_main_dispatch (context=0x7f0fcc000c30) at
../glib/gmain.c:3460
#11 g_main_context_dispatch (context=0x7f0fcc000c30) at ../glib/gmain.c:4200
#12 0x00007f0fe1f6bcd8 in g_main_context_iterate.isra.0
(context=0x7f0fcc000c30, block=1,
dispatch=1, self=<optimized out>) at ../glib/gmain.c:4276
#13 0x00007f0fe1f0d233 in g_main_context_iteration (context=0x7f0fcc000c30,
may_block=1)
--Type <RET> for more, q to quit, c to continue without paging--c
at ../glib/gmain.c:4343
#14 0x00007f0fe2d06919 in QEventDispatcherGlib::processEvents
(this=0x7f0fcc000b70, flags=...)
at kernel/qeventdispatcher_glib.cpp:423
#15 0x00007f0fe2cb270b in QEventLoop::exec (this=this@entry=0x7f0fd25fed00,
flags=...,
flags@entry=...) at
../../include/QtCore/../../src/corelib/global/qflags.h:69
#16 0x00007f0fe2af4160 in QThread::exec (
this=this@entry=0x7f0fe311e060 <(anonymous
namespace)::Q_QGS__q_manager::innerFunction()::holder>) at
../../include/QtCore/../../src/corelib/global/qflags.h:121
#17 0x00007f0fe30a4b3b in QDBusConnectionManager::run (
this=0x7f0fe311e060 <(anonymous
namespace)::Q_QGS__q_manager::innerFunction()::holder>)
at qdbusconnection.cpp:179
#18 0x00007f0fe2af556d in operator() (__closure=<optimized out>) at
thread/qthread_unix.cpp:350
#19 (anonymous
namespace)::terminate_on_exception<QThreadPrivate::start(void*)::<lambda()> >
(t=...)
at thread/qthread_unix.cpp:287
#20 QThreadPrivate::start (
arg=0x7f0fe311e060 <(anonymous
namespace)::Q_QGS__q_manager::innerFunction()::holder>)
at thread/qthread_unix.cpp:310
#21 0x00007f0fe24adc57 in start_thread (arg=<optimized out>) at
pthread_create.c:444
#22 0x00007f0fe2533a70 in clone3 () at
../sysdeps/unix/sysv/linux/x86_64/clone3.S:81
The process appeared to be being stopped. The invalid address in frame #0 might
have been due to corruption of a function pointer destructExtended in
QMetaType::destruct.
(gdb) frame 1
#1 0x00007f0fe2cc85db in QMetaType::destruct (data=0x55a076b87800,
this=0x7f0fd25fe900)
at kernel/qmetatype.h:2372
2372 return destructExtended(data);
(gdb) p destructExtended
$1 = {void (const QMetaType * const,
void *)} 0x7f0fe2cc8530 <QMetaType::destructExtended(void*) const>
The crash happened infrequently. The problem might involve a race condition in
which the function in frame #0 was freed or corrupted before it was used during
shutdown or not. I've had file indexing disabled in System Settings when this
problem happened, so I'm not sure why qdbus-qt5 org.kde.baloo was run.
STEPS TO REPRODUCE
1. Boot a Fedora 38 KDE Plasma installation updated to 2023-4-17 with the
updates-testing repo enabled. The check mark for Enable File Indexing was
removed in System Settings > Search > File Search > File Search long before the
crashes happened.
2. Log in to Plasma 5.27.4 on Wayland
3. Shut down the system from the Application Launcher menu.
4. Repeat 1-3 until the crash happens. This crash was infrequent so this might
take many boots to happen.
OBSERVED RESULT
qdbus-qt5 org.kde.baloo occasionally crashed during shutdown
EXPECTED RESULT
No crash would happen.
SOFTWARE/OS VERSIONS
Linux/KDE Plasma: Fedora 38
(available in About System)
KDE Plasma Version: 5.27.4
KDE Frameworks Version: 5.104.0
Qt Version: 5.15.9
ADDITIONAL INFORMATION
I'm attaching the full trace of all threads of the qdbus-qt5 org.kde.baloo
crash.
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