修复crash心得

作者: tom__zhu | 来源:发表于2021-01-29 14:43 被阅读0次

修复crash心得
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Exception Type:  EXC_CRASH (SIGABRT)
Exception Codes: 0x0000000000000000, 0x0000000000000000
Exception Note:  EXC_CORPSE_NOTIFY
Triggered by Thread:  56

Thread 56 name:
Thread 56 Crashed:
0   libsystem_kernel.dylib          0x00000001bc37b414 __pthread_kill + 8
1   libsystem_pthread.dylib         0x00000001d8893b40 pthread_kill + 272 (pthread.c:1388)
2   libsystem_c.dylib               0x00000001987a0bf4 __abort + 116 (abort.c:147)
3   libsystem_c.dylib               0x00000001987a0b80 abort + 116 (abort.c:118)
4   libsystem_malloc.dylib          0x000000019e82649c malloc_vreport + 560 (malloc_printf.c:183)
5   libsystem_malloc.dylib          0x000000019e82667c malloc_report + 64 (malloc_printf.c:192)
6   libsystem_malloc.dylib          0x000000019e81af68 free + 532 (malloc.c:1862)
7   CoreFoundation                  0x000000018f3598fc -[__NSArrayM insertObject:atIndex:] + 360 (NSArrayM_Common.h:260)
8   XXXPhoneVideo                   0x0000000108cbdac0 -[XXImgsPrefetcherMgr prefetchImgsWithUrls:completedBlock:] + 160 (XXImgsPrefetcher.m:194)
9   XXXPhoneVideo                   0x0000000108cbd9cc -[XXImgsPrefetcherMgr prefetchImgsUrlByLaunch:completedBlock:] + 184 (XXImgsPrefetcher.m:180)
10  XXXPhoneVideo                   0x0000000106fa9a84 +[XXPlayerPreInitManager preLoadHighLevelCloudImages] + 220 (XXPlayerPreInitManager.m:209)
11  libdispatch.dylib               0x000000018f06f24c _dispatch_call_block_and_release + 32 (init.c:1454)
12  libdispatch.dylib               0x000000018f070db0 _dispatch_client_callout + 20 (object.m:559)
13  libdispatch.dylib               0x000000018f073ddc _dispatch_queue_override_invoke + 692 (inline_internal.h:2548)
14  libdispatch.dylib               0x000000018f08193c _dispatch_root_queue_drain + 356 (inline_internal.h:2589)
15  libdispatch.dylib               0x000000018f082120 _dispatch_worker_thread2 + 116 (queue.c:6777)
16  libsystem_pthread.dylib         0x00000001d88947c8 _pthread_wqthread + 216 (pthread.c:2219)
17  libsystem_pthread.dylib         0x00000001d889b75c start_wqthread + 8

这个崩溃从堆栈上看比较奇怪，是在系统进行malloc内存分配的时候出现了异常触发了abort()函数。同时这段业务代码调用并不存在可能触发这类异常的逻辑，所以可以大胆猜测这份Crash实际上堆栈已经被破坏了（Heap corruption），最重要的是堆错误的时候可能是在指针出现损坏（野指针）后很久才会被访问到导致崩溃。所以这份奇怪的Crash实际上并非真正导致崩溃的现场，这种情况就需要借助其他内存排查工具去解决。