最近我发现一些 Mac OS X 应用程序频繁崩溃，并出现如下回溯：
Process: Mail [39226]
Path: /Applications/Mail.app/Contents/MacOS/Mail
Identifier: com.apple.mail
Version: 4.4 (1082)
Build Info: Mail-10820000~1
Code Type: X86-64 (Native)
Parent Process: launchd [338]
Date/Time: 2011-01-12 21:59:48.383 -0500
OS Version: Mac OS X 10.6.6 (10J567)
Report Version: 6
Exception Type: EXC_BREAKPOINT (SIGTRAP)
Exception Codes: 0x0000000000000002, 0x0000000000000000
Crashed Thread: 12 Dispatch queue: com.apple.root.default-priority
[...]
Thread 12 Crashed: Dispatch queue: com.apple.root.default-priority
0 com.apple.CoreFoundation 0x00007fff81653975 __THE_SYSTEM_HAS_NO_PORT_SETS_AVAILABLE__ + 5
1 com.apple.CoreFoundation 0x00007fff815a1f69 __CFRunLoopFindMode + 553
2 com.apple.CoreFoundation 0x00007fff815a1c5d __CFRunLoopCreate + 317
3 com.apple.CoreFoundation 0x00007fff815a1a78 _CFRunLoopGet0 + 744
4 com.apple.CoreFoundation 0x00007fff815dc90a CFRunLoopRunInMode + 58
5 com.apple.MessageFramework 0x00007fff81d01183 +[NSRunLoop(MessageExtensions) _flushQueuedEventsAddingSource:] + 120
6 com.apple.MessageFramework 0x00007fff81d010d2 +[NSRunLoop(MessageExtensions) flushQueuedEvents] + 36
7 com.apple.MessageFramework 0x00007fff81ce6515 -[_MFInvocationOperation main] + 275
8 com.apple.Foundation 0x00007fff83921de4 -[__NSOperationInternal start] + 681
9 com.apple.Foundation 0x00007fff83a00beb __doStart2 + 97
10 libSystem.B.dylib 0x00007fff801402c4 _dispatch_call_block_and_release + 15
11 libSystem.B.dylib 0x00007fff8011e831 _dispatch_worker_thread2 + 239
12 libSystem.B.dylib 0x00007fff8011e168 _pthread_wqthread + 353
13 libSystem.B.dylib 0x00007fff8011e005 start_wqthread + 13
[...]
和：
Process: osascript [34568]
Path: /usr/bin/osascript
Identifier: osascript
Version: ??? (???)
Code Type: X86-64 (Native)
Parent Process: GeekTool [6699]
Date/Time: 2011-01-19 06:06:41.198 -0500
OS Version: Mac OS X 10.6.6 (10J567)
Report Version: 6
Exception Type: EXC_BREAKPOINT (SIGTRAP)
Exception Codes: 0x0000000000000002, 0x0000000000000000
Crashed Thread: 0 Dispatch queue: com.apple.main-thread
Thread 0 Crashed: Dispatch queue: com.apple.main-thread
0 com.apple.CoreFoundation 0x00007fff81653975 __THE_SYSTEM_HAS_NO_PORT_SETS_AVAILABLE__ + 5
1 com.apple.CoreFoundation 0x00007fff815a1f69 __CFRunLoopFindMode + 553
2 com.apple.CoreFoundation 0x00007fff815a1c5d __CFRunLoopCreate + 317
3 com.apple.CoreFoundation 0x00007fff815a1988 _CFRunLoopGet0 + 504
4 com.apple.CoreFoundation 0x00007fff815a177f CFRunLoopGetMain + 79
5 com.apple.CoreFoundation 0x00007fff815a08ef _CFXNotificationCenterCreate + 383
6 com.apple.CoreFoundation 0x00007fff815a073b _CFXNotificationGetHostCenter + 75
7 com.apple.CoreFoundation 0x00007fff815a0532 __CFXPreferencesGetSourceForTriplet + 354
8 com.apple.CoreFoundation 0x00007fff8159db49 __CFXPreferencesGetSearchListForBundleID + 217
9 com.apple.CoreFoundation 0x00007fff8159d9fb CFPreferencesCopyAppValue + 43
10 com.apple.CoreFoundation 0x00007fff8159d999 _CFBundleCopyUserLanguages + 665
11 com.apple.CoreFoundation 0x00007fff8159d1b4 _CFBundleAddPreferredLprojNamesInDirectory + 404
12 com.apple.CoreFoundation 0x00007fff8159cc8a _CFBundleGetLanguageSearchList + 170
13 com.apple.CoreFoundation 0x00007fff8159d4ba _CFBundleAddPreferredLprojNamesInDirectory + 1178
14 com.apple.CoreFoundation 0x00007fff8159cc8a _CFBundleGetLanguageSearchList + 170
15 com.apple.CoreFoundation 0x00007fff8159cadf CFBundleCopyResourceURL + 47
16 com.apple.CoreFoundation 0x00007fff815fe4c4 _CFBundleCopyResourceForkURLMayBeLocal + 148
17 com.apple.CoreFoundation 0x00007fff8162c7d0 CFBundleOpenBundleResourceFiles + 144
18 ...ple.CoreServices.CarbonCore 0x00007fff885f3130 _openFrameworkResourceFiles + 137
19 ...ple.CoreServices.CarbonCore 0x00007fff885e048c CLVVisitValuesForKey + 81
20 ...ple.CoreServices.CarbonCore 0x00007fff885f2fee INIT_ResourceManager + 734
21 ...ple.CoreServices.CarbonCore 0x00007fff885f2bed StandardEntry + 57
22 ...ple.CoreServices.CarbonCore 0x00007fff885f2af9 FSOpenResourceFile + 77
23 ...ple.CoreServices.CarbonCore 0x00007fff886543fc FSOpenResFile + 75
24 com.apple.openscripting 0x00007fff844e8884 OSADoIt(short, ComponentInstanceRecord*, FSRef const*, unsigned int, unsigned int, int, unsigned int*, AEDesc*, unsigned char*) + 2715
25 com.apple.openscripting 0x00007fff844e8b6a OSALoadFile + 50
26 osascript 0x0000000100001898 0x100000000 + 6296
27 osascript 0x0000000100000fa0 0x100000000 + 4000
对于造成这种情况的原因和/或如何补救，您有什么想法吗？
答案1
我不是内核程序员，但我猜想该消息与内核中 Mach 端口耗尽有关。您是否正在运行无数个进程，或者您是否在进行大量进程间通信？您是否可能内存和磁盘空间不足（没有空间扩展交换区）？
尝试使用top或活动监视器来查看是否有任何进程出现问题，比如您可能编写了一个递归 AppleScript 或 shell 脚本，它会产生无数的子进程（就像意外的“fork 炸弹”）。
遇到此崩溃时，请注意您正在运行哪些应用程序。也许某个应用程序过度使用 Mach 端口，有时会吞噬所有端口。当您运行虚拟机系统（例如 VMware、Parallels 或 VirtualBox）时，是否更容易出现此问题？
答案2
嗯。我尝试重置 SyncServices ---http://support.apple.com/kb/TS1627--- 从那时起 Mail 就再也没有崩溃过。