NSURLCache crashes under iOS 6.1

Question

Using iOS 6.1 my App crashes regulary, directly after startup, when it attempts to make several HTTP-Requests, but it works fine on any OS < 6.1.

I'm experiencing EXC_BAD_ACCESS crashes in the strlen function called from the Queue : com.apple.CFURLCACHE_work_queue, everytime my App is started, except for the first time.

NSURLCache crashes

I could resolve the issue by clearing the NSURLCache, directly after the app started:

[[NSURLCache sharedURLCache] removeAllCachedResponses];

Does anyone else experience these crashes? Could there be some issue in the application code causing these crashes? Or should this be a bug filed to apple?

Possibly related to a severe iOS 6.1 bug reported yesterday, when it connects to (and crashes) Microsoft Exchange servers? — danorton
It seems like this has been fixed on iOS8, our crash reporting tool only reports this on iOS7 — aryaxt

slammens slammens · Accepted Answer · 2013-02-13T11:35:02

Experiencing a similar crash since iOS 6.1 with a newly installed application. The difference is that the crash occurs when tapping a text cell in a table view. No web requests are being made at this time.

This is the bt:

thread #4: tid = 0x2903, 0x3ae7ad74 libsystem_c.dylib`strlen + 28, stop reason = EXC_BAD_ACCESS (code=1, address=0x0)
frame #0: 0x3ae7ad74 libsystem_c.dylib`strlen + 28
frame #1: 0x3ac6be24 libsqlite3.dylib`___lldb_unnamed_function282$$libsqlite3.dylib + 1232
frame #2: 0x3ac74a5e libsqlite3.dylib`sqlite3_file_control + 174
frame #3: 0x328493fe CFNetwork`__CFURLCache::RecreateEmptyPersistentStoreOnDiskAndOpen_NoLock() + 30
frame #4: 0x32849000 CFNetwork`__CFURLCache::RecreateEmptyPersistentStoreOnDiskAndOpen() + 44
frame #5: 0x327f9488 CFNetwork`__CFURLCache::OpenDatabase() + 192
frame #6: 0x32846a72 CFNetwork`__CFURLCache::ProcessCacheTasks0(bool) + 358
frame #7: 0x32846900 CFNetwork`__CFURLCache::ProcessCacheTasks(bool) + 36
frame #8: 0x3284681e CFNetwork`__CFURLCache::_CFURLCacheTimerCallback0() + 358
frame #9: 0x328466ac CFNetwork`__CFURLCache::_CFURLCacheTimerCallback(void*) + 32
frame #10: 0x328490fc CFNetwork`__SignalWorkerTaskToPerformWork_block_invoke_0 + 12
frame #11: 0x3ae4611e libdispatch.dylib`_dispatch_call_block_and_release + 10
frame #12: 0x3ae49ece libdispatch.dylib`_dispatch_queue_drain$VARIANT$mp + 142
frame #13: 0x3ae49dc0 libdispatch.dylib`_dispatch_queue_invoke$VARIANT$mp + 40
frame #14: 0x3ae4a91c libdispatch.dylib`_dispatch_root_queue_drain + 184
frame #15: 0x3ae4aac0 libdispatch.dylib`_dispatch_worker_thread2 + 84
frame #16: 0x3ae7aa10 libsystem_c.dylib`_pthread_wqthread + 360
frame #17: 0x3ae7a8a4 libsystem_c.dylib`start_wqthread + 8

Reported this as a TSI to Apple, it was reviewed and they requests that I log this as a bug, still need to do this.

Interestingly enough the solution which you found also helped me, clearing the cache at launch solved this problem.

NSURLCache crashes under iOS 6.1

2 Answers