https://bugs.kde.org/show_bug.cgi?id=357040
Bug ID: 357040
Summary: Dolphin crashes with SIGSEGV because it prematurely
destroys a QThread that is subsequently still used
Product: dolphin
Version: 15.08.3
Platform: Debian unstable
OS: Linux
Status: UNCONFIRMED
Severity: crash
Priority: NOR
Component: view-engine: general
Assignee: dolphin-bugs-n...@kde.org
Reporter: jm.ouwerk...@gmail.com
Happens nearly but not quite every time in VirtualBox.
Dolphin version: 15.08
Reproducible: Sometimes
Steps to Reproduce:
1. Open Dolphin
2. Right click a directory
3. Move the mouse pointer towards Properties.
Actual Results:
Dolphin crashes with a SIGSEGV. qDebug statements point out that it happens
because a QThread is being used that's already destroyed. Additionally if you
trigger this from gdb it can lock up your session (prevent it from responding
to mouse clicks, and keyboard input).
Expected Results:
I'd expect the properties dialog of the directory to come up.
Fun fact: if you trigger this from gdb, which gives you a breakpoint at the
crash site, you lock up the entire session because it becomes entirely
unresponsive to input beyond mouse pointer movement. No keyboard, no focus
switching no... nothing except pointer movement.
Unfortunately Ctrl+Alt+F2 and so on don't work in virtualbox so a workaround is
necessary to trigger this safely. Using SSH and the following command:
DISPLAY:0 gdb dolphin
I got this backtrace at the point of the segfault:
[New Thread 0x7fffd65db700 (LWP 908)]
QThread: Destroyed while thread is still running
Program received signal SIGSEGV, Segmentation fault.
[Switching to Thread 0x7fffd65db700 (LWP 908)]
0x00007ffff2620843 in QThreadStorageData::finish(void**) () from
/usr/lib/x86_64-linux-gnu/libQt5Core.so.5
(gdb) bt
#0 0x00007ffff2620843 in QThreadStorageData::finish(void**) () from
/usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#1 0x00007ffff2621a25 in ?? () from /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#2 0x00007ffff262289f in ?? () from /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#3 0x00007fffef10e284 in start_thread (arg=0x7fffd65db700) at
pthread_create.c:333
#4 0x00007ffff784c74d in clone () at
../sysdeps/unix/sysv/linux/x86_64/clone.S:109
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