We encountered a large number of crashes reported by Crashlytics, but our development team was unable to reproduce it so far. It seems to happen more frequently on iOS 9.1 (we had this crash before as well, but the number has dramatically increased since 21st of October - launch date of iOS 9.1).
The stacktrace is not very helpful, but hopefully somebody else encountered something similar:
Thread : Crashed: com.apple.root.default-qos
0 libsystem_platform.dylib 0x19af92318 _platform_memmove + 296
1 CoreFoundation 0x1859b44f8 CFDataGetBytes + 172
2 CoreFoundation 0x1859b44f8 CFDataGetBytes + 172
3 ImageIO 0x186db1df0 CGImageReadGetBytesAtOffset + 624
4 ImageIO 0x186dbfff8 read_fn2 + 116
5 ImageIO 0x186e68110 _cg_png_read_chunk_header + 64
6 ImageIO 0x186dbfe58 __copyImageBlockSetPNG_block_invoke + 552
7 libdispatch.dylib 0x19ad85c2c _dispatch_client_callout2 + 16
8 libdispatch.dylib 0x19ad96ebc _dispatch_apply_invoke + 96
9 libdispatch.dylib 0x19ad97450 dispatch_apply_f + 740
10 ImageIO 0x186dbcb08 copyImageBlockSetPNG + 3280
11 ImageIO 0x186dbb584 ImageProviderCopyImageBlockSetCallback + 852
12 QuartzCore 0x18a85ae38 CA::Render::create_image(CGImage, CGColorSpace, unsigned int) + 972
13 QuartzCore 0x18a859f18 CA::Render::copy_image(CGImage, CGColorSpace, unsigned int, double) + 372
14 QuartzCore 0x18a85aa58 CA::Render::prepare_image(CGImage, CGColorSpace, unsigned int, double) + 12
15 QuartzCore 0x18a82dacc CA::Layer::prepare_commit(CA::Transaction*) + 292
16 QuartzCore 0x18a82cccc CA::Context::commit_transaction(CA::Transaction*) + 264
17 QuartzCore 0x18a82ca08 CA::Transaction::commit() + 512
18 QuartzCore 0x18a8260f8 CA::Transaction::observer_callback(__CFRunLoopObserver, unsigned long, void) + 80
19 CoreFoundation 0x185a5bbd0 CFRUNLOOP_IS_CALLING_OUT_TO_AN_OBSERVER_CALLBACK_FUNCTION + 32
20 CoreFoundation 0x185a59974 __CFRunLoopDoObservers + 372
21 CoreFoundation 0x185a59da4 __CFRunLoopRun + 928
22 CoreFoundation 0x185988ca0 CFRunLoopRunSpecific + 384
23 GraphicsServices 0x190bc4088 GSEventRunModal + 180
24 UIKit 0x18b0a0ffc UIApplicationMain + 204
25 *** 0x100020694 main + 52 (main.m:13)
26 libdyld.dylib 0x19adb68b8 start + 4
Please let us know if you have any thoughts about how this crash can be reproduced/fixed.
Thanks!