Timer tab doesn't show the preset labels and shows NaN on the time (Qt 5.2)

[Leo Arias]

This happens with the qt5.2 landing 006 PPA on my mako.

To reproduce:
Open the clock
Go to the timer tab.
Click a timer.

The labels of the presets are not displayed, and where it should show the time, it shows NaN. See the screenshot.

[Leo Arias (elopio)]

Confirmed by davmor2.

[Leo Arias (elopio)]

Trying to get information from gdb:

Program received signal SIGSEGV, Segmentation fault.
0x71002e00 in ?? ()
(gdb) backtrace
#0 0x71002e00 in ?? ()
#1 0xb6c16790 in QV4::MemoryManager::mark() ()
   from /usr/lib/arm-linux-gnueabihf/libQt5Qml.so.5
#2 0xb6c16b30 in QV4::MemoryManager::runGC() ()
   from /usr/lib/arm-linux-gnueabihf/libQt5Qml.so.5
#3 0xb6c16d96 in QV4::MemoryManager::alloc(unsigned int) ()
   from /usr/lib/arm-linux-gnueabihf/libQt5Qml.so.5
#4 0xb6c0575e in QV4::ExecutionEngine::newString(QString const&) ()
   from /usr/lib/arm-linux-gnueabihf/libQt5Qml.so.5
#5 0xb6c2d1c2 in QV4::FunctionObject::FunctionObject(QV4::ExecutionContext*, QString const&, bool) () from /usr/lib/arm-linux-gnueabihf/libQt5Qml.so.5
#6 0xb6c578fc in ?? () from /usr/lib/arm-linux-gnueabihf/libQt5Qml.so.5
Backtrace stopped: previous frame identical to this frame (corrupt stack?)

[Ricardo Salveti (rsalveti)]

This seems to be a huge mem leak somehow, which makes the device useless for a while (until killed by OOM).

[Ricardo Salveti (rsalveti)]

It crashes as soon as you click at the "nan:nan:" label.

[Ricardo Salveti (rsalveti)]

Caused by a change in u1db:
https://code.launchpad.net/~kalikiana/u1db-qt/revertResultFields/+merge/210890