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This seems related to http://bugzilla.xamarin.com/show_bug.cgi?id=215 but not the same.
I get this crash on the simulator when I'm typing in a field with autocorrection type turned on. Seems to work on the device though.
0 SaambaaiPhone 0x000d3044 mono_handle_native_sigsegv + 343
1 SaambaaiPhone 0x0001129c mono_sigsegv_signal_handler + 322
2 libsystem_c.dylib 0x95ccb59b _sigtramp + 43
3 ??? 0xffffffff 0x0 + 4294967295
4 CoreGraphics 0x90d3680b CGDataProviderRetain + 22
5 CoreFoundation 0x9383e24a CFAllocatorCreate + 90
6 ImageIO 0x99b365fd CGImageReadCreateWithProvider + 169
7 ImageIO 0x99b364bd CGImageSourceCreateWithDataProvider + 220
8 CoreGraphics 0x01705ba4 CGImageCreateWithPNGDataProvider + 98
9 WebCore 0x0378c37d WKGraphicsCreateImageFromBundleWithName + 349
10 WebCore 0x03022eab _ZN7WebCore15GraphicsContext34drawLineForMisspellingOrBadGrammarERKNS_8IntPointEib + 75
11 WebCore 0x030e7e86 _ZN7WebCore13InlineTextBox28paintSpellingOrGrammarMarkerEPNS_15GraphicsContextEiiRKNS_14DocumentMarkerEPNS_11RenderStyleERKNS_4FontEb + 742
12 WebCore 0x030e8226 _ZN7WebCore13InlineTextBox20paintDocumentMarkersEPNS_15GraphicsContextEiiPNS_11RenderStyleERKNS_4FontEb + 438
13 WebCore 0x030e8d46 _ZN7WebCore13InlineTextBox5paintERNS_12RenderObject9PaintInfoEii + 2694
14 WebCore 0x030e43df _ZN7WebCore13InlineFlowBox5paintERNS_12RenderObject9PaintInfoEii + 463
15 WebCore 0x036017c5 _ZN7WebCore13RootInlineBox5paintERNS_12RenderObject9PaintInfoEii + 53
16 WebCore 0x03578b00 _ZNK7WebCore17RenderLineBoxList5paintEPNS_20RenderBoxModelObjectERNS_12RenderObject9PaintInfoEii + 1472
17 WebCore 0x03514321 _ZN7WebCore11RenderBlock13paintContentsERNS_12RenderObject9PaintInfoEii + 81
18 WebCore 0x0351479d _ZN7WebCore11RenderBlock11paintObjectERNS_12RenderObject9PaintInfoEii + 541
19 WebCore 0x03510721 _ZN7WebCore11RenderBlock5paintERNS_12RenderObject9PaintInfoEii + 289
20 WebCore 0x0351419a _ZN7WebCore11RenderBlock13paintChildrenERNS_12RenderObject9PaintInfoEii + 474
21 WebCore 0x0351479d _ZN7WebCore11RenderBlock11paintObjectERNS_12RenderObject9PaintInfoEii + 541
22 WebCore 0x03510721 _ZN7WebCore11RenderBlock5paintERNS_12RenderObject9PaintInfoEii + 289
23 WebCore 0x0351419a _ZN7WebCore11RenderBlock13paintChildrenERNS_12RenderObject9PaintInfoEii + 474
24 WebCore 0x0351479d _ZN7WebCore11RenderBlock11paintObjectERNS_12RenderObject9PaintInfoEii + 541
25 WebCore 0x03510721 _ZN7WebCore11RenderBlock5paintERNS_12RenderObject9PaintInfoEii + 289
26 WebCore 0x0351419a _ZN7WebCore11RenderBlock13paintChildrenERNS_12RenderObject9PaintInfoEii + 474
27 WebCore 0x0351479d _ZN7WebCore11RenderBlock11paintObjectERNS_12RenderObject9PaintInfoEii + 541
28 WebCore 0x03510721 _ZN7WebCore11RenderBlock5paintERNS_12RenderObject9PaintInfoEii + 289
29 WebCore 0x03568a8f _ZN7WebCore11RenderLayer10paintLayerEPS0_PNS_15GraphicsContextERKNS_7IntRectEjPNS_12RenderObjectEPN3WTF7HashMapIPNS_24OverlapTestRequestClientES4_NS9_7PtrHashISC_EENS9_10HashTraitsISC_EENSF_IS4_EEEEj + 1375
30 WebCore 0x03568c62 _ZN7WebCore11RenderLayer10paintLayerEPS0_PNS_15GraphicsContextERKNS_7IntRectEjPNS_12RenderObjectEPN3WTF7HashMapIPNS_24OverlapTestRequestClientES4_NS9_7PtrHashISC_EENS9_10HashTraitsISC_EENSF_IS4_EEEEj + 1842
31 WebCore 0x03569475 _ZN7WebCore11RenderLayer5paintEPNS_15GraphicsContextERKNS_7IntRectEjPNS_12RenderObjectE + 101
32 WebCore 0x02fef072 _ZN7WebCore9FrameView13paintContentsEPNS_15GraphicsContextERKNS_7IntRectE + 322
33 WebKit 0x029127f2 -[WebFrame(WebInternal) _drawRect:contentsOnly:] + 274
34 WebKit 0x029407a4 -[WebHTMLView drawSingleRect:] + 148
35 WebKit 0x02940888 -[WebHTMLView drawRect:] + 152
36 WebCore 0x0378e7b8 _ZL11_WKViewDrawP9CGContextP6WKView6CGRectb + 344
37 WebCore 0x0378e88f _ZL11_WKViewDrawP9CGContextP6WKView6CGRectb + 559
38 WebCore 0x0378e88f _ZL11_WKViewDrawP9CGContextP6WKView6CGRectb + 559
39 WebCore 0x0378e88f _ZL11_WKViewDrawP9CGContextP6WKView6CGRectb + 559
40 WebCore 0x0378e88f _ZL11_WKViewDrawP9CGContextP6WKView6CGRectb + 559
41 WebCore 0x0378ea30 WKViewDisplayRect + 80
42 WebCore 0x0378f971 WKWindowDrawRect + 49
43 WebCore 0x03730333 _ZN7WebCore9TileCache9drawLayerEP7CALayerP9CGContext + 611
44 QuartzCore 0x01394e47 _ZL16backing_callbackP9CGContextPv + 85
45 QuartzCore 0x012e21f7 CABackingStoreUpdate + 2246
46 QuartzCore 0x01394d24 -[CALayer _display] + 1085
47 WebCore 0x03732394 -[TileLayer display] + 84
48 QuartzCore 0x0138b27d CALayerDisplayIfNeeded + 231
49 QuartzCore 0x013300c3 _ZN2CA7Context18commit_transactionEPNS_11TransactionE + 325
50 QuartzCore 0x01331294 _ZN2CA11Transaction6commitEv + 292
51 QuartzCore 0x0133146d _ZN2CA11Transaction17observer_callbackEP19__CFRunLoopObservermPv + 99
52 CoreFoundation 0x0151489b __CFRUNLOOP_IS_CALLING_OUT_TO_AN_OBSERVER_CALLBACK_FUNCTION__ + 27
53 CoreFoundation 0x014a96e7 __CFRunLoopDoObservers + 295
54 CoreFoundation 0x014721d7 __CFRunLoopRun + 1575
55 CoreFoundation 0x01471840 CFRunLoopRunSpecific + 208
56 CoreFoundation 0x01471761 CFRunLoopRunInMode + 97
57 GraphicsServices 0x0259c1c4 GSEventRunModal + 217
58 GraphicsServices 0x0259c289 GSEventRun + 115
59 UIKit 0x00b14c93 UIApplicationMain + 1160
60 ??? 0x08fbf805 0x0 + 150730757
61 ??? 0x08fbf450 0x0 + 150729808
62 ??? 0x08fbf0c4 0x0 + 150728900
63 ??? 0x08fbef1c 0x0 + 150728476
64 ??? 0x08fbf06e 0x0 + 150728814
65 SaambaaiPhone 0x00011057 mono_jit_runtime_invoke + 1332
66 SaambaaiPhone 0x001efadd mono_runtime_invoke + 137
67 SaambaaiPhone 0x001f21c4 mono_runtime_exec_main + 669
68 SaambaaiPhone 0x001f15ae mono_runtime_run_main + 843
69 SaambaaiPhone 0x000a515a mono_jit_exec + 200
70 SaambaaiPhone 0x0000430f main + 3865
71 SaambaaiPhone 0x000025b9 _start + 208
72 SaambaaiPhone 0x000024e8 start + 40
Debug info from gdb:
dyld: could not load inserted library: /Users/Andrew/Library/Application Support/iPhone Simulator/4.3.2/Applications/CC01350F-A34A-41B7-A4B2-1AD5D8545A1F/Saambaa.iPhone.app/monotouch-fixes.dylib
Got a SIGSEGV while executing native code. This usually indicates
a fatal error in the mono runtime or one of the native libraries
used by your application.
You're right that's it's totally unrelated. The "dyld: could not load inserted library" is printed by GDB as a warning - but it's not part of the crash. However the way it works (at least right now) makes it that people only notice it when they crash.
Could you provide us with a small, self-contained, test case to duplicate the issue ?
I tried to self-contain the issue but no matter what I did I was not able to create the same crash in the sample project. I could send you the source of our project but it is a closed source project. Do you guys have a way of handling this?
Andrew, you should be able to attach code and comment 'privately' using bugzilla (it will be visible to all xamarin employees).
Another option is to sign NDA. Fot the later send an email to firstname.lastname@example.org and refer to this bug report.
I tried to attach a private attachment but I got an error in really large font saying "Sorry, but you are not allowed to (un)mark comments or attachments as private."
got the code
I could duplicate the crash.
Ok, that's a weird one. There's do not seem to be a "direct" relation between the UITextField and the crash.
With a bit of googling I found the following:
which has an identical stacktrace, the same "autocorrect" trigger and suggesting a memory corruption - caused by images. That later bit could explain why:
(a) it cannot be reproduced using a smaller test case (i.e. no images);
(b) it works on the device (where all images are re-compressed);
yep, that bug on SO definitely looks and acts the same as what i'm getting.
b. perhaps i can try running the simulator against the same re-compressed images used on the device to see if that could solve the issue. but then again, if it works on the device, that's pretty much the end goal for me anyway.
I did it a bit harder and removed all images (and commented code using them) then reset'ed the simulator. Sadly I can't get pass the facebook autorization (maybe I just unlucky where I can on the screen), I do get a message from the app but clicking on "Dismiss" does not bring back the, image-less, UI.
Any luck on your side ?
Replacing the images with the re-compressed images from an iPhone build did not work. Still crashes.
It's hard to be 100% sure that:
a) the stackoverflow comment is totally accurate. The issue is the same (so it's unrelated to MonoTouch itself*) and the "proposed" culprit does make sense with previous comments. However a smaller application has less chance to corrupt memory than a larger one (image related or not);
b) "re-compression" will solve the issue. E.g. the memory corruption could happen on the device, without crashing the app (or with a different crash).
I suggest you try removing as much images as possible (maybe not as much as I tried in comment #9, or at least in stages) to see if one (or some) of the image(s) are really the source of the problem.
* downgrading severity to normal
The auto-correcting API is known to cause problems, we had a couple of bugs before along those lines, and various reports on the net on pure Objective-C code bases.
Removing "autocorrect" from Interface Builder fixes that.
This is only a bug in certain versions of iOS
So I tried replacing all of my images with a empty.png file and it still crashes the same way. Any other suggestions?
Did you remove the auto-correct flag from your UITextField?
The autocorrect flag was what I reported in the original bug description as the offending line in my code. So yeah, setting it to false or No would cause the crash to not appear. But if this is a bug that doesn't originate from MT, then there isn't really much we can do about it right?
I was just following Sebastien's lead in trying to see if there was some kind of memory corruption in the images my project was using.
Right, not much we can do - it's pretty deep inside Apple's code :(
Something triggers this (since it does not always occurs) and the stackoverflow answer was an interesting lead... but adding an #if !SIMULATOR (and adjusting your builds to define the symbol) is likely the only solution (not involving a lot of time for something out of your, and our, control).
Looks like a iOS sdk bug. I'm closing this issue.
*** Bug 660 has been marked as a duplicate of this bug. ***
*** Bug 3538 has been marked as a duplicate of this bug. ***