[Powerdevil] [Bug 378445] kscreenlocker_greet occasionally freezes in malloc in signal handler

[David Edmundson]

https://bugs.kde.org/show_bug.cgi?id=378445

David Edmundson <kde at davidedmundson.co.uk> changed:

           What    |Removed                     |Added
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                 CC|                            |kde at davidedmundson.co.uk

--- Comment #8 from David Edmundson <kde at davidedmundson.co.uk> ---
How on Earth do we get from:


#7  0x00007f4f607cd097 in QDBusUtil::isValidBusName(QString const&) () from
/usr/lib64/libQt5DBus.so.5

to 

#4  0x000000000040c65e in ScreenLocker::UnlockApp::setLockedPropertyOnViews
(this=<optimized out>) at
/usr/src/debug/kscreenlocker-5.9.4/greeter/greeterapp.cpp:414


isValidBusName is just a string check making sure it's "foo.bar.blah" It can't
call or emit anything, no nested event loops or anything.


The ony thing this means is that we have a corrupt backtrace.

This could be beause the debug symboles were installed badly and refer to a
different version - or we have some code smashing the stack. 

Also note that the two backtraces are actually different. The first is in
QDBusServiceWatcher::QDBusServiceWatcher, which the second isn't in.

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