问题描述
我不断收到来自随机用户的随机崩溃报告。不幸的是，我无法定期重现这一点。用户说崩溃是在 discussionViewController 中随机发生的。所有崩溃报告都有类似的内容：
0 libswiftCore.dylib 0x00000001a53face4 swift::RefCounts<swift::RefCountBitsT<(swift::RefCountInlinedness)1> >::incrementSlow(swift::RefCountBitsT<(swift::RefCountInlinedness)1>,unsigned int) + 60 (atomic:1003)
1 libswiftCore.dylib 0x00000001a53c59e0 swift_retain + 124 (RefCount.h:813)
2 libswiftCore.dylib 0x00000001a5401d60 swift_bridgeObjectRetain + 56 (SwiftObject.mm:585)
3 APPNAME 0x0000000102b59734 closure #1 in discussionViewController.fetchPostData() + 7916
这是完整的崩溃日志和崩溃的线程：
Hardware Model: iphone11,6
Process: APPNAME [11770]
Path: /private/var/containers/Bundle/Application/.../APPNAME.app/APPNAME
Identifier: ----
Version: 62 (62)
AppStoretools: 12E262
AppVariant: 1:iphone11,6:13
Code Type: ARM-64 (Native)
Role: Foreground
Parent Process: launchd [1]
Coalition: ---- [1824]
Date/Time: 2021-06-17 12:07:01.4346 +1000
Launch Time: 2021-06-17 12:06:56.4993 +1000
OS Version: iPhone OS 14.6 (18F72)
Release Type: User
Baseband Version: 3.04.01
Report Version: 104
Exception Type: EXC_BAD_ACCESS (SIGSEGV)
Exception Subtype: KERN_INVALID_ADDRESS at 0x8000000000000010 -> 0x0000000000000010 (possible pointer authentication failure)
VM Region Info: 0x10 is not in any region. Bytes before following region: 4339515376
REGION TYPE START - END [ VSIZE] PRT/MAX SHRMOD REGION DETAIL
UNUSED SPACE AT START
--->
__TEXT 102a7c000-102a94000 [ 96K] r-x/r-x SM=COW ...APPNAME.app/APPNAME
Termination Signal: Segmentation fault: 11
Termination Reason: Namespace SIGNAL,Code 0xb
Terminating Process: exc handler [11770]
Triggered by Thread: 3
Thread 3 name:
Thread 3 Crashed:
0 libswiftCore.dylib 0x00000001a53face4 swift::RefCounts<swift::RefCountBitsT<(swift::RefCountInlinedness)1> >::incrementSlow(swift::RefCountBitsT<(swift::RefCountInlinedness)1>,unsigned int) + 60 (atomic:1003)
1 libswiftCore.dylib 0x00000001a53c59e0 swift_retain + 124 (RefCount.h:813)
2 libswiftCore.dylib 0x00000001a5401d60 swift_bridgeObjectRetain + 56 (SwiftObject.mm:585)
3 APPNAME 0x0000000102b59734 closure #1 in discussionViewController.fetchPostData() + 7916
4 APPNAME 0x0000000102ad09d4 thunk for @escaping @callee_guaranteed (@guaranteed Data?,@guaranteed NSURLResponse?,@guaranteed Error?) -> () + 132 (<compiler-generated>:0)
5 CFNetwork 0x00000001a1b0a3dc __40-[__NSURLSessionLocal taskForClassInfo:]_block_invoke + 540 (LocalSession.mm:687)
6 CFNetwork 0x00000001a1b1c768 __49-[__NSCFLocalSessionTask _task_onqueue_didFinish]_block_invoke + 244 (LocalSessionTask.mm:584)
7 libdispatch.dylib 0x00000001a10d1a84 _dispatch_call_block_and_release + 32 (init.c:1466)
8 libdispatch.dylib 0x00000001a10d381c _dispatch_client_callout + 20 (object.m:559)
9 libdispatch.dylib 0x00000001a10db004 _dispatch_lane_serial_drain + 620 (inline_internal.h:2557)
10 libdispatch.dylib 0x00000001a10dbc34 _dispatch_lane_invoke + 456 (queue.c:3862)
11 libdispatch.dylib 0x00000001a10e64bc _dispatch_workloop_worker_thread + 764 (queue.c:6589)
12 libsystem_pthread.dylib 0x00000001ed04a7a4 0x1ed047000 + 14244
13 libsystem_pthread.dylib 0x00000001ed05174c 0x1ed047000 + 42828
我已验证 discussionViewController.fetchPostData() 不会强制解开任何可选选项，没有 try! 并且在任何地方都使用 [weak self] 和 self?。该函数非常大，所以我很难缩小崩溃发生的范围。
解决方法
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