EXC_BAD_ACCESS crash

Question

Created May ’21

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Hi, I have been seeing this since some time, haven't been able to replicate this, could somebody help me understand why it is crashing here at this point?

Please refer to the function implementation here:

Code Block public func crystalAPIObjecta(_ crystalAPIObject: ZV2CrystalAPIObject?,
             didFetchDataWithResponseObject responseObject: ZCrystalAPIResponseObject?,
             isPolling: Bool) {
    guard let responseObject = responseObject else { return }
    self.isPolling = isPolling
    responseObject.blockerItems?.forEach{ _ in /* */ }
    self.crystalResponseObject = responseObject /* crashing here at this point */
  }

Pls refer to the stack trace below:

Crashed: com.apple.main-thread
EXC_BAD_ACCESS KERN_INVALID_ADDRESS 0x0000000b2b50c4a0

Code Block Crashed: com.apple.main-thread
0  libobjc.A.dylib                0x1af25dde0 objc_release + 16
1  ZO2Kit                         0x1030d6ae4 specialized ZV2CrystalVM.crystalAPIObject(_:didFetchDataWithResponseObject:isPolling:) + 255 (ZV2CrystalVM.swift:255)
2  ZO2Kit                         0x103118198 partial apply for closure #1 in ZV2CrystalAPIObject.didFetchObjects(_:for:withInitialParams:) + 83 (ZV2CrystalAPIObject.swift:83)
3  ZO2Kit                         0x1034d5c48 thunk for @escaping @callee_guaranteed () -> () + 4362771528 (<compiler-generated>:4362771528)
4  libdispatch.dylib              0x19aaf5298 _dispatch_call_block_and_release + 24
5  libdispatch.dylib              0x19aaf6280 _dispatch_client_callout + 16
6  libdispatch.dylib              0x19aaa505c _dispatch_main_queue_callback_4CF$VARIANT$mp + 896
7  CoreFoundation                 0x19ae3d5e0 __CFRUNLOOP_IS_SERVICING_THE_MAIN_DISPATCH_QUEUE__ + 12
8  CoreFoundation                 0x19ae37a88 __CFRunLoopRun + 2480
9  CoreFoundation                 0x19ae36ba0 CFRunLoopRunSpecific + 572
10 GraphicsServices               0x1b1b9c598 GSEventRunModal + 160
11 UIKitCore                      0x19d7282f4 -[UIApplication _run] + 1052
12 UIKitCore                      0x19d72d874 UIApplicationMain + 164
13 Zomato                         0x1001242b4 main + 15 (main.m:15)
14 libdyld.dylib                  0x19ab15568 start + 4

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Answer 1

Claude31 OP

May ’21

At first glance, you have a thread issue.

Where are you calling crystalAPIObjecta ?
Maybe some handler should be declared @escaping, otherwise you call objects which have already disappeared.

More code would be necessary to confirm.

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