After some more experimentation, I narrowed it down a little more: It seems 
the issue was introduced between versions 0.3.4 and 0.3.5. Also, it seems 
that the problem is inside the polymer package, *not* the platform layer as 
one might expect (I reproduced the crashes with Polymer/polymer#0.3.5 + 
Polymer/platform#0.3.2). Then again, apparently TemplateBinding and 
polymer-expressions are contained in the polymer package, so maybe not that 
surprising after all. So it seems the culprit is hiding in one of these 
changesets:

https://github.com/Polymer/polymer-dev/compare/0.3.4...0.3.5
https://github.com/polymer/TemplateBinding/compare/0.3.4...0.3.5
https://github.com/polymer/polymer-expressions/compare/0.3.4...0.3.5
https://github.com/Polymer/polymer-gestures/compare/0.3.4...0.3.5

Anything else I missed that is part of the polymer package?

On Monday, September 1, 2014 10:56:18 AM UTC+2, Martin Kleinschrodt wrote:
>
> Ever since updating from v0.3.2, my Polymer app crashes all the time. The 
> problem is extremely hard to debug since I don't get any error messages in 
> the browser console but instead the app crashes completely. This happens 
> both in mobile safari and in the web view. The only clue that I have is 
> this log from my cordova app:
>
> Process 15971 stopped
> * thread #6: tid = 0x5783c3, 0x36ae071a 
> WebCore`WebCore::Document::touchEventsChangedTimerFired(WebCore::Timer<WebCore::Document>*)
>  
> + 254, name = 'WebThread', stop reason = EXC_BAD_ACCESS (code=1, 
> address=0xfffffff9)
>     frame #0: 0x36ae071a 
> WebCore`WebCore::Document::touchEventsChangedTimerFired(WebCore::Timer<WebCore::Document>*)
>  
> + 254
> WebCore`WebCore::Document::touchEventsChangedTimerFired(WebCore::Timer<WebCore::Document>*)
>  
> + 254:
> -> 0x36ae071a:  ldr.w  r8, [r0]
>    0x36ae071e:  cmp.w  r8, #0x0
>    0x36ae0722:  beq    0x36ae07e4                ; 
> WebCore::Document::touchEventsChangedTimerFired(WebCore::Timer<WebCore::Document>*)
>  
> + 456
>    0x36ae0724:  movs   r0, #0x0
>
> I don't know enough about WebCore to get anything from this, but based on 
> when the crashes occur (usually after updating a model) I suspect that the 
> problem has something to do with either polymer-expressions or 
> TemplateBinding.
>
> I'm currently using Polymer 0.4.0 but I think the problem exists since 
> 0.3.3.
>
> If you want to reproduce the problem yourself, go ahead and open 
> http://maklesoft.github.io/padlock on your iPhone (or iOS simulator) and 
> follow these steps:
>
> - Choose a master password (you can simply use an empty one)
> - Create a record
> - Go back
> - Create another record
> - Switch back and forth between the two records (tap a record to select 
> it), at some point the app will crash (probably sooner rather than later)
>
> Other ways to reproduce the crash
>
> - Delete a record
> - Add a field to a record
> - Add a category to a record
>
> I wish I could offer more information, but at this point I am pretty much 
> clueless. If you want to dig through the code, you can find it at
>
> https://github.com/maklesoft/padlock
>
> I probably don't have to mention that this is a show stopper for me. I 
> wonder if anybody is having similar problems?
>

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