崩溃是SIGABRT，它不是“未找到选择器”。可能会过度释放。但崩溃只发生在arm64设备上，并且堆栈不一样。
我还找到_nano_malloc_check_clear来源，http://opensource.apple.com/source/libmalloc/libmalloc-53.1.1/src/nano_malloc.c
与_nano_malloc_check_clear相关的另一个暂停崩溃是， https://stackoverflow.com/questions/30802134/app-crashes-entering-foreground-with-uistatusbar
此类崩溃从未发生在以前的版本或32位设备中。我在iPhone6 plus上同时使用10个线程和无限循环来重现，但失败了。
记录1：
Exception Type: SIGABRT
Exception Codes: #0 at 0x195217270
Crashed Thread: 0
Thread 0 Crashed:
0 libsystem_kernel.dylib 0x0000000195217270 __pthread_kill + 8
1 libsystem_c.dylib 0x000000019518eb18 abort + 112
2 libsystem_malloc.dylib 0x00000001952523e4 _nano_malloc_check_clear + 0
3 libsystem_malloc.dylib 0x00000001952512f8 nano_free + 192
4 CoreFoundation 0x0000000184225444 CFRelease + 1064
5 CoreFoundation 0x00000001842cdcc8 __CFBinaryPlistCreateObjectFiltered + 2480
6 CoreFoundation 0x00000001842ceb10 __CFBinaryPlistCreateObjectFiltered + 6136
7 CoreFoundation 0x00000001842cf06c __CFTryParseBinaryPlist + 204
8 CoreFoundation 0x0000000184222f04 _CFPropertyListCreateWithData + 124
9 CoreFoundation 0x000000018424f2fc CFPropertyListCreateWithData + 104
10 Foundation 0x000000018514f1d8 +[NSPropertyListSerialization propertyListWithData:options:format:error:] + 112
11 AlipayWallet 0x00000001012e2160 decodeObjectFromData + 148
记录2：
Thread 36 Crashed:
0 libsystem_kernel.dylib 0x0000000197a13270 __pthread_kill + 8
1 libsystem_c.dylib 0x000000019798ab18 abort + 112
2 libsystem_malloc.dylib 0x0000000197a4e3e4 _nano_malloc_check_clear + 0
3 libsystem_malloc.dylib 0x0000000197a4d2f8 nano_free + 192
4 libsqlite3.dylib 0x000000019765689c 0x1975a8000 + 714908
5 libsqlite3.dylib 0x000000019761606c 0x1975a8000 + 450668
6 libsqlite3.dylib 0x0000000197670fc8 0x1975a8000 + 823240
7 libsqlite3.dylib 0x00000001975c9f90 0x1975a8000 + 139152
8 libsqlite3.dylib 0x00000001975f0cf0 0x1975a8000 + 298224
9 libsqlite3.dylib 0x00000001975e3368 sqlite3_step + 528
10 AlipayWallet 0x00000001012fe038 -[FMDatabase executeUpdate:error:withArgumentsInArray:orDictionary:orVAList:] + 1756
11 AlipayWallet 0x00000001012fe41c -[FMDatabase executeUpdate:withArgumentsInArray:] + 76
记录3：
Thread 36 Crashed:
0 libsystem_kernel.dylib 0x0000000195f97270 __pthread_kill + 8
1 libsystem_c.dylib 0x0000000195f0eb18 abort + 112
2 libsystem_malloc.dylib 0x0000000195fd23e4 _nano_malloc_check_clear + 0
3 libsystem_malloc.dylib 0x0000000195fd12f8 nano_free + 192
4 CoreFoundation 0x0000000183fb4d40 __CFArrayReleaseValues + 492
5 CoreFoundation 0x0000000183f11394 CFRelease + 328
6 CoreFoundation 0x0000000183fb9948 __CFBinaryPlistWriteOrPresize + 504
7 Foundation 0x0000000184eb2668 -[NSKeyedArchiver finishEncoding] + 604
8 Foundation 0x0000000184eb8370 +[NSKeyedArchiver archivedDataWithRootObject:] + 212