[Webkit-unassigned] [Bug 139654] DropAllLocks assertion on iOS

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=139654

--- Comment #1 from Ian Ragsdale <ian.ragsdale at gmail.com> ---
I've got a bit of new information to share. We released a new beta of the app in which this crash went from infrequent to very frequent (from 8 crashes in ~6k sessions to 160 crashes in ~5k sessions).

Very little in the app changed - some CSS changes, some minor Javascript changes (animating a width change and a few more style changes in a completion callback), and a change to how we detect the initial document load is complete. However, that was enough for a huge spike in crashes.

This was interesting because while the stack trace of the crashed thread varied, 156 of the 160 crashes showed the same backtrace for the main thread:

Thread : com.apple.main-thread
0  libsystem_kernel.dylib         0x2fe05ba8 __psynch_mutexwait + 24
1  libsystem_pthread.dylib        0x2fe8104b _pthread_mutex_lock + 398
2  WebCore                        0x2d353b91 _WebTryThreadLock(bool) + 44
3  WebCore                        0x2d3543ad WebThreadLock + 80
4  UIKit                          0x2561ca69 -[UIWebDocumentView setDataDetectorTypes:] + 56
5  Boxer                          0x000cc245 -[ConversationViewController renderConversation] (ConversationViewController.m:869)
6  libdispatch.dylib              0x2fd1f7bb _dispatch_call_block_and_release + 10
7  libdispatch.dylib              0x2fd1f7a7 _dispatch_client_callout + 22
8  libdispatch.dylib              0x2fd22fa3 _dispatch_main_queue_callback_4CF + 718
9  CoreFoundation                 0x21fcf3b1 __CFRUNLOOP_IS_SERVICING_THE_MAIN_DISPATCH_QUEUE__ + 8
10 CoreFoundation                 0x21fcdab1 __CFRunLoopRun + 1512
11 CoreFoundation                 0x21f1b3c1 CFRunLoopRunSpecific + 476
12 CoreFoundation                 0x21f1b1d3 CFRunLoopRunInMode + 106
13 GraphicsServices               0x293190a9 GSEventRunModal + 136
14 UIKit                          0x2552afa1 UIApplicationMain + 1440
15 Boxer                          0x000900a7 main (main.m:11)

(More details here: http://crashes.to/s/b1531e29971)

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