OSSpinLockLock 是反复引起的，并且 lldb 没有为此显示适当的 callStackSymbols。
以下是我从 Xcode 版本 5.0.1 (5A2034a) 的 lldb 中得到的
我试图通过 [NSThread callStackSymbols] 获取更多符号，但在这种情况下无效。
这只发生在 SpriteKit (iOS7) 上。我已经在 SKEmitterNodes 周围检查了数十次，但它内部没有错误。奇怪的是，有时 copyWithZone: 消息在高速弹丸中无法正常运行，如下所示：
SKEmitterNode * template=[NSKeyedUnarchiver unarchiveObjectWithFile:[[NSBundle mainBundle] pathForResource:@"cannonball_flame" ofType:@"sks"]]; .... ... [模板副本]; // --> 在某些情况下不好
有没有人知道解决这个问题？它是由 SpriteKit 错误引起的吗？
2013 年 11 月 2 日凌晨 1:31 调用堆栈 0
libsystem_platform.dylib`OSSpinLockLock:
0x38ef1654: movs r1, #1
libsystem_platform.dylib`spin_lock + 2:
0x38ef1656: ldrex r2, [r0]
0x38ef165a: cmp r2, #0
0x38ef165c: it ne
0x38ef165e: bne.w 0x38ef4a94 ; _OSSpinLockLockSlow$shim
0x38ef1662: strex r2, r1, [r0]
0x38ef1666: cmp r2, #0
0x38ef1668: bne 0x38ef1656 ; spin_lock + 2
0x38ef166a: dmb ish
0x38ef166e: bx lr
call stack 1
SpriteKit`SKSpinLockSync(int*, void () block_pointer):
0x30c2d924: push {r4, r5, r6, r7, lr}
0x30c2d926: add r7, sp, #12
0x30c2d928: push.w {r8, r10, r11}
0x30c2d92c: sub.w r4, sp, #64
0x30c2d930: bic r4, r4, #15
0x30c2d934: mov sp, r4
0x30c2d936: vst1.64 {d8, d9, d10, d11}, [r4, :128]!
0x30c2d93a: vst1.64 {d12, d13, d14, d15}, [r4, :128]
0x30c2d93e: sub sp, #64
0x30c2d940: mov r4, r0
0x30c2d942: mov r0, r1
0x30c2d944: str r4, [sp, #4]
0x30c2d946: blx 0x30c44114 ; symbol stub for: dispatch_async$shim
0x30c2d94a: movw r2, #1712
0x30c2d94e: ldr r1, [pc, #140] ; SKSpinLockSync(int*, void () block_pointer) + 184
0x30c2d950: movt r2, #2171
0x30c2d954: str r0, [sp, #8]
0x30c2d956: add r0, sp, #12
0x30c2d958: add r2, pc
0x30c2d95a: ldr r2, [r2]
0x30c2d95c: add r1, pc
0x30c2d95e: str r2, [sp, #36]
0x30c2d960: str r1, [sp, #40]
0x30c2d962: ldr r1, [pc, #124] ; SKSpinLockSync(int*, void () block_pointer) + 188
0x30c2d964: str r7, [sp, #44]
0x30c2d966: str.w sp, [sp, #52]
0x30c2d96a: orr r1, r1, #1
0x30c2d96e: add r1, pc
0x30c2d970: str r1, [sp, #48]
0x30c2d972: movs r1, #1
0x30c2d974: str r1, [sp, #16]
0x30c2d976: blx 0x30c44274 ; symbol stub for: SKCRenderPassNew::operator=(SKCRenderPassNew const&)
0x30c2d97a: mov r0, r4
0x30c2d97c: blx 0x30c44234 ; symbol stub for: +[SKOpenGLNode openGLNodeWithViewportSize:]
0x30c2d980: ldr r0, [sp, #8]
0x30c2d982: movs r2, #2
0x30c2d984: ldr r1, [r0, #12]
0x30c2d986: ldr r0, [sp, #8]
0x30c2d988: str r2, [sp, #16]
0x30c2d98a: blx r1
0x30c2d98c: movs r0, #3
0x30c2d98e: str r0, [sp, #16]
0x30c2d990: ldr r0, [sp, #4]
0x30c2d992: blx 0x30c44244 ; symbol stub for: -[SKOpenGLNode needsRenderForTime:]
0x30c2d996: ldr r0, [sp, #8]
0x30c2d998: blx 0x30c44104 ; symbol stub for: objc_copyWeak$shim
0x30c2d99c: add r0, sp, #12
0x30c2d99e: blx 0x30c44294 ; symbol stub for: SKCRenderPassNew::~SKCRenderPassNew()
0x30c2d9a2: add r4, sp, #64
0x30c2d9a4: vld1.64 {d8, d9, d10, d11}, [r4, :128]!
0x30c2d9a8: vld1.64 {d12, d13, d14, d15}, [r4, :128]
0x30c2d9ac: sub.w r4, r7, #24
0x30c2d9b0: mov sp, r4
0x30c2d9b2: pop.w {r8, r10, r11}
0x30c2d9b6: pop {r4, r5, r6, r7, pc}
0x30c2d9b8: ldr r0, [sp, #16]
0x30c2d9ba: cmp r0, #3
0x30c2d9bc: bls 0x30c2d9c0 ; SKSpinLockSync(int*, void () block_pointer) + 156
0x30c2d9be: trap
0x30c2d9c0: tbb [pc, r0]
0x30c2d9c4: lsls r2, r0, #8
0x30c2d9c6: movs r2, r0
0x30c2d9c8: ldr r4, [sp, #20]
0x30c2d9ca: ldr r0, [sp, #8]
0x30c2d9cc: blx 0x30c44104 ; symbol stub for: objc_copyWeak$shim
0x30c2d9d0: mov.w r0, #4294967295
0x30c2d9d4: str r0, [sp, #16]
0x30c2d9d6: mov r0, r4
0x30c2d9d8: blx 0x30c44284 ; symbol stub for: SKCRenderPassNew::~SKCRenderPassNew()
0x30c2d9dc: ldr r3, [sp, #400]
0x30c2d9de: movs r1, r0
0x30c2d9e0: lsls r6, r0, #1
0x30c2d9e2: movs r0, r0
didBeginContact: Hit Tree
(lldb) po [NSThread callStackSymbols]
<_NSCallStackArray 0x7f9fe40>(
0 ??? 0x00571654 0x0 + 5707348,
1 NaughtyBirds 0x000e7175 main + 0,
2 SpriteKit 0x30bf38fd <redacted> + 300,
3 SpriteKit 0x30bf67ef <redacted> + 42,
4 SpriteKit 0x30c163a5 <redacted> + 3136,
5 SpriteKit 0x30c262ab <redacted> + 354,
6 SpriteKit 0x30c262ab <redacted> + 354,
7 SpriteKit 0x30c262ab <redacted> + 354,
8 SpriteKit 0x30beeb93 <redacted> + 174,
9 SpriteKit 0x30c03449 <redacted> + 324,
10 SpriteKit 0x30c00add <redacted> + 820,
11 SpriteKit 0x30bfe51b <redacted> + 130,
12 SpriteKit 0x30c20c87 <redacted> + 254,
13 libglInterpose.dylib 0x002bb5ff -[DYDisplayLinkInterposer forwardDisplayLinkCallback:] + 270,
14 QuartzCore 0x309dfad3 <redacted> + 98,
15 QuartzCore 0x309df87d <redacted> + 344,
16 IOMobileFramebuffer 0x3360f76d <redacted> + 104,
17 IOKit 0x2f266be5 IODispatchCalloutFromCFMessage + 248,
18 CoreFoundation 0x2e544b81 <redacted> + 136,
19 CoreFoundation 0x2e54f777 <redacted> + 34,
20 CoreFoundation 0x2e54f713 <redacted> + 346,
21 CoreFoundation 0x2e54dedf <redacted> + 1406,
22 CoreFoundation 0x2e4b8471 CFRunLoopRunSpecific + 524,
23 CoreFoundation 0x2e4b8253 CFRunLoopRunInMode + 106,
24 GraphicsServices 0x331f22eb GSEventRunModal + 138,
25 UIKit 0x30d6d845 UIApplicationMain + 1136,
26 NaughtyBirds 0x000e7259 main + 228,
27 libdyld.dylib 0x38ddaab7 <redacted> + 2
)
(lldb) bt all * thread #1: tid = 0xcf5af, 0x38ef1656 libsystem_platform.dylib spin_lock + 2, queue = 'com.apple.main-thread, stop reason = EXC_BAD_ACCESS (code=1, address=0x0)
frame #0: 0x38ef1656 libsystem_platform.dylibspin_lock + 2 frame #1: 0x30c2d980 SpriteKit SKSpinLockSync(int*, void () block_pointer) + 92
frame #2: 0x30bf38fc SpriteKit-[SKTexture loadImageData] + 300 frame #3: 0x30bf67ee SpriteKit -[SKTexture size] + 42
frame #4: 0x30c163a4 SpriteKitSKCEmitterSprite::update(double) + 3136 frame #5: 0x30c262aa SpriteKit SKCSprite::update(double) + 354
frame #6: 0x30c262aa SpriteKitSKCSprite::update(double) + 354 帧 #7: 0x30c262aa SpriteKit SKCSprite::update(double) + 354
frame #8: 0x30beeb92 SpriteKit-[SKScene _update:] + 174 帧 #9: 0x30c03448 SpriteKit -[SKView(Private) _update:] + 324
frame #10: 0x30c00adc SpriteKit-[SKView renderCallback:] + 820 帧 #11: 0x30bfe51a SpriteKit __29-[SKView setUpRenderCallback]_block_invoke + 130
frame #12: 0x30c20c86 SpriteKit-[ SKDisplayLink callbackForNextFrame:] + 254 帧 #13: 0x002bb5fe libglInterpose.dylib -[DYDisplayLinkInterposer forwardDisplayLinkCallback:] + 270
frame #14: 0x309dfad2 QuartzCoreCA::Display::DisplayLinkItem::dispatch() + 98 帧 #15: 0x309df87c QuartzCore CA::Display::DisplayLink::dispatch_items(unsigned long long, unsigned long long, unsigned long long) + 344
frame #16: 0x3360f76c IOMobileFramebufferIOMobileFramebufferVsyncNotifyFunc + 104 帧 #17: 0x2f266be4 IOKitIODispatchCalloutFromCFMessage + 248
frame #18: 0x2e544b80 CoreFoundation_CFMACHPORTPERFORM + 136帧＃19：0x2E54F776核心__CFRUNLOOP_IS_CALLING_OUT_TO_A_SOURCE1_PERFORM_FUNCTION__ + 34
frame #20: 0x2e54f712 CoreFoundation控件__cfrunloopdosource1 + 346框架＃21：0x2E54DEDE COREFOUNDECFRUNOOPRUNSPECIFIC __CFRunLoopRun + 1406
frame #22: 0x2e4b8470 CoreFoundation+ 524框架23：0x2E4B8252 COREFOUND AT2 AT2 AT2 AT2 AT2 ARG2 ARG2 ARGRIUK + iik + iik + iik @ indriik + iik CFRunLoopRunInMode + 106
frame #24: 0x331f22ea GraphicsServices@ influn + iik @ n.and inder + 30 UIApplicationMain + 1136
frame #26: 0x000e7258 NaughtyBirds. .m:18
线程 #5：tid = 0xcf5de，0x38e91550 libsystem_kernel.dylib __semwait_signal + 24, name = 'gputools.smt_poll.0x15d305b0
frame #0: 0x38e91550 libsystem_kernel.dylib__semwait_signal + 24 帧 #1：0x38e024ec libsystem_c.dylib 睡眠nanosleep + 172
frame #2: 0x38e0243c libsystem_c.dylib+ 52 帧 #3：0x00350ad0 GPUToolsCore smt_poll_thread_entry(void*) + 124
frame #4: 0x38ef7c5c libsystem_pthread.dylib_pthread_body + 140 帧 #5：0x38ef7bce libsystem_pthread.dylib`p`_p
线程 #7：tid = 0xcf5e0，0x38e7e838 libsystem_kernel.dylib kevent64 + 24, queue = 'com.apple.libdispatch-manager
frame #0: 0x38e7e838 libsystem_kernel.dylibkevent64 + 24 帧 #1：0x38dcd0d4 libdispatch.dylib _dispatch_mgr_invoke + 232
frame #2: 0x38dc7622 libdispatch.dylib_dispatch_mgr_thread + 38
线程 #8: tid = 0xcf655, 0x38e91c7c libsystem_kernel.dylib __workq_kernreturn + 8
frame #0: 0x38e91c7c libsystem_kernel.dylib__workq_kernreturn + 8 帧 #1: 0x38ef5e0a libsystem_pthread.dylib`_pthread_wqthread + 310
线程 #9: tid = 0xcf664, 0x38e7ea84 libsystem_kernel.dylib mach_msg_trap + 20
frame #0: 0x38e7ea84 libsystem_kernel.dylibmach_msg_trap + 20 帧 #1: 0x38e7e880 libsystem_kernel.dylib mach_msg + 40
frame #2: 0x2df353c2 AudioToolboxAURemoteIO::IOThread::Run() + 106 帧 #3: 0x2df38600 AudioToolbox AURemoteIO::IOThread::Entry(void*) + 8
frame #4: 0x2de75772 AudioToolboxCAPThread::Entry(CAPThread*) + 210帧 #5：0x38ef7c5c libsystem_pthread.dylib _pthread_body + 140
frame #6: 0x38ef7bce libsystem_pthread.dylib_pthread_start + 102 (lldb)