UIWebview: WebThread EXC_BAD_ACCESS

Question

I have a completely simple app: Show a web view with http://tv2.dk

I'am using a storyboard, added the web view and set a property on my controller. To keep things simple i'am not setting a delegate.

In viewDidLoad i call the web view with the url i want to load

[self.webView loadRequest:[NSURLRequest requestWithURL:[NSURL URLWithString:@"http://tv2.dk"]]];

Each time the app starts up it crashes due to some error in a web thread worker, see this dump.

libobjc.A.dylib`objc_msgSend:
0x1954f7bc0:  cmp    x0, #0
0x1954f7bc4:  b.le   0x1954f7c30               ; objc_msgSend + 112
0x1954f7bc8:  ldr    x13, [x0]
0x1954f7bcc:  and    x9, x13, #0x1fffffff8
0x1954f7bd0:  ldp    x10, x11, [x9, #16]
0x1954f7bd4:  and    w12, w1, w11
0x1954f7bd8:  add    x12, x10, x12, lsl #4
0x1954f7bdc:  ldp    x16, x17, [x12]
0x1954f7be0:  cmp    x16, x1
0x1954f7be4:  b.ne   0x1954f7bec               ; objc_msgSend + 44
0x1954f7be8:  br     x17
0x1954f7bec:  cbz    x16, 0x1954f7d80          ; _objc_msgSend_uncached_impcache
0x1954f7bf0:  cmp    x12, x10
0x1954f7bf4:  b.eq   0x1954f7c00               ; objc_msgSend + 64
0x1954f7bf8:  ldp    x16, x17, [x12, #-16]!
0x1954f7bfc:  b      0x1954f7be0               ; objc_msgSend + 32
0x1954f7c00:  add    x12, x12, w11, uxtw #4
0x1954f7c04:  ldp    x16, x17, [x12]
0x1954f7c08:  cmp    x16, x1
0x1954f7c0c:  b.ne   0x1954f7c14               ; objc_msgSend + 84
0x1954f7c10:  br     x17
0x1954f7c14:  cbz    x16, 0x1954f7d80          ; _objc_msgSend_uncached_impcache
0x1954f7c18:  cmp    x12, x10
0x1954f7c1c:  b.eq   0x1954f7c28               ; objc_msgSend + 104
0x1954f7c20:  ldp    x16, x17, [x12, #-16]!
0x1954f7c24:  b      0x1954f7c08               ; objc_msgSend + 72
0x1954f7c28:  mov    x2, x9
0x1954f7c2c:  b      0x1954e1e70               ; objc_msgSend_corrupt_cache_error
0x1954f7c30:  b.eq   0x1954f7c48               ; objc_msgSend + 136
0x1954f7c34:  adrp   x10, 18278
0x1954f7c38:  add    x10, x10, #1904
0x1954f7c3c:  lsr    x11, x0, #60
0x1954f7c40:  ldr    x9, [x10, x11, lsl #3]
0x1954f7c44:  b      0x1954f7bd0               ; objc_msgSend + 16
0x1954f7c48:  movz   x1, #0
0x1954f7c4c:  movi   d0, #0000000000000000
0x1954f7c50:  movi   d1, #0000000000000000
0x1954f7c54:  movi   d2, #0000000000000000
0x1954f7c58:  movi   d3, #0000000000000000
0x1954f7c5c:  ret    

Offending line

0x1954f7bd0:  ldp    x10, x11, [x9, #16]

Check out the full source code here: https://bitbucket.org/styrken/ios-webview-crash

I have tried running this code on multiple devices etc, crashes on them all.

Answer 1

From @RasmusStyrk 's comment above

I have found out that with using NSZombie's, i got the following crash message: WebviewCrash[4598:956679] *** -[UIViewAnimationState release]: message sent to deallocated instance 0x1707c5370. To fix this i had to turn off animations in UIVIew using [UIView setAnimationsEnabled:NO]; and now it works. It seems like a bug in iOS8. –

We also had this where it would randomly crash, and setting [UIView setAnimationsEnabled:NO] is the only thing that has worked to completely alleviate this issue!