Created
August 9, 2012 17:54
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Am I crazy, or will this function always hang if it hits that dispatch_sync_f() call?
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| This is some LLDB output from my app in a hung state somewhere deep in the image rendering frameworks. It looks like it's hung on dispatch_sync_f(), and from what I can tell from the disassembly, it looks like it's dispatching it on the current queue (see the call to dispatch_get_current_queue() just a few instructions prior), which the docs say will always hang. | |
| (lldb) bt | |
| * thread #1: tid = 0x2203, 0x00007fff88b4f6c2 libsystem_kernel.dylib`semaphore_wait_trap + 10, stop reason = signal SIGSTOP | |
| frame #0: 0x00007fff88b4f6c2 libsystem_kernel.dylib`semaphore_wait_trap + 10 | |
| frame #1: 0x00007fff88924c6e libdispatch.dylib`_dispatch_thread_semaphore_wait + 16 | |
| frame #2: 0x00007fff88924ace libdispatch.dylib`_dispatch_barrier_sync_f_slow + 188 | |
| frame #3: 0x00007fff89387efb OpenCL`clFinish + 120 | |
| frame #4: 0x00007fff8e5d5d3d CoreImage`-[FEOpenCLContext _quad:] + 3743 | |
| frame #5: 0x00007fff8e6ce18e CoreImage`-[FEContext(Drawing) quad:kernel:] + 107 | |
| frame #6: 0x00007fff8e6114ae CoreImage`FEApplyTreeNode::render1(FETreeContext*, FEShape const&, fe_kernel_target_struct*, int, float*, FETreeTexture*) + 2712 | |
| frame #7: 0x00007fff8e611c65 CoreImage`FEApplyTreeNode::render2(FETreeContext*, FEShape const*, void (*)(FEContext*, void*, FEFormat), void (*)(FEContext*, void*), void*) + 1583 | |
| frame #8: 0x00007fff8e60ecf7 CoreImage`FETreeNode::render_(FETreeContext*, FEShape const*, void (*)(FEContext*, void*, FEFormat), void (*)(FEContext*, void*), void*) + 169 | |
| frame #9: 0x00007fff8e6129f5 CoreImage`FETreeNode::render(FETreeContext*, FEShape const&, void (*)(FEContext*, void*, FEFormat), void (*)(FEContext*, void*), void*) + 107 | |
| frame #10: 0x00007fff8e616741 CoreImage`FETreeContext::renderTree(FETreeNode*, FEShape const&, void (*)(FEContext*, void*, FEFormat), void (*)(FEContext*, void*), void*) + 277 | |
| frame #11: 0x00007fff8e616a65 CoreImage`FETreeContext::renderImage_(FEImage*, CGRect, FEShape const*, CGAffineTransform, CGColorSpace*, FEFormat, bool, void (*)(FEContext*, void*, FEFormat), void (*)(FEContext*, void*), void*) + 703 | |
| frame #12: 0x00007fff8e616e41 CoreImage`FETreeContext::renderImage(FEImage*, CGRect, FEShape const*, CGAffineTransform, CGColorSpace*, FEFormat, bool, void (*)(FEContext*, void*, FEFormat), void (*)(FEContext*, void*), void*) + 459 | |
| frame #13: 0x00007fff8e5ed6d6 CoreImage`-[FEImage(Internal) _renderWithContext:bounds:transform:colorSpace:format:premultiplied:setupCallback:finishCallback:callbackData:] + 339 | |
| frame #14: 0x00007fff8e5ecaef CoreImage`-[FEImage getBitmap:withContext:origin:transform:colorSpace:] + 694 | |
| frame #15: 0x00007fff8e5a1e4a CoreImage`-[CIContextImpl render:toBitmap:rowBytes:bounds:format:colorSpace:] + 427 | |
| frame #16: 0x00007fff8e5a0d18 CoreImage`-[CIContext render:toBitmap:rowBytes:bounds:format:colorSpace:] + 77 | |
| frame #17: 0x00007fff893636f6 libCGXCoreImage.A.dylib`cgxcoreimage_instance_render + 2264 | |
| frame #18: 0x00007fff89362d31 libCGXCoreImage.A.dylib`cgxcoreimage_provider_create_byte_pointer + 126 | |
| frame #19: 0x00007fff83f50729 CoreGraphics`CGAccessSessionGetBytePointer + 49 | |
| frame #20: 0x00007fff83f95b0e CoreGraphics`img_decode_read + 184 | |
| frame #21: 0x00007fff83f9595e CoreGraphics`img_colormatch_read + 346 | |
| frame #22: 0x00007fff83f9579a CoreGraphics`img_alphamerge_read + 551 | |
| frame #23: 0x00007fff83f7784d CoreGraphics`img_data_lock + 7109 | |
| frame #24: 0x00007fff83f74dfa CoreGraphics`CGSImageDataLock + 193 | |
| frame #25: 0x00007fff90247ba9 libRIP.A.dylib`ripc_AcquireImage + 2468 | |
| frame #26: 0x00007fff90246709 libRIP.A.dylib`ripc_DrawImage + 1045 | |
| frame #27: 0x00007fff83f7492f CoreGraphics`CGContextDrawImage + 460 | |
| frame #28: 0x00007fff8546396a CoreUI`CUIPenCG::DrawImage(void*, CGRect, void*) + 54 | |
| frame #29: 0x00007fff8546c624 CoreUI`CUIArtFileRenderer::DrawImage(CGRect, long, CUIDescriptor const*) + 10558 | |
| frame #30: 0x00007fff8545a90f CoreUI`CUIArtFileRenderer::Draw(CUIDescriptor const*, CGAffineTransform, CUIReturnInfo&) + 1571 | |
| frame #31: 0x00007fff854359e1 CoreUI`CUIRenderer::Draw(CGRect, CGContext*, __CFDictionary const*, __CFDictionary const**) + 3343 | |
| frame #32: 0x00007fff85460c4b CoreUI`CUIDraw + 180 | |
| frame #33: 0x00007fff87822a2f AppKit`-[NSCoreUIImageRep draw] + 260 | |
| frame #34: 0x00007fff878228b1 AppKit`-[NSImageRep drawInRect:] + 384 | |
| frame #35: 0x00007fff87b8ec5c AppKit`__block_global_0 + 64 | |
| frame #36: 0x00007fff878225a4 AppKit`NSGraphicsContextPushContextWithFlippedMetadata_drawWithBlock_ + 312 | |
| frame #37: 0x00007fff878222c5 AppKit`__74-[NSImageRep drawInRect:fromRect:operation:fraction:respectFlipped:hints:]_block_invoke_0 + 1686 | |
| frame #38: 0x00007fff87821a18 AppKit`-[NSImageRep drawInRect:fromRect:operation:fraction:respectFlipped:hints:] + 1070 | |
| frame #39: 0x00007fff8781fcb1 AppKit`-[NSImage _drawMappingAlignmentRectToRect:withState:backgroundStyle:operation:fraction:flip:hints:] + 2375 | |
| frame #40: 0x00007fff878e3b30 AppKit`-[NSImageCell _drawImageWithFrame:inView:] + 228 | |
| frame #41: 0x00007fff878e34e2 AppKit`-[NSImageCell drawInteriorWithFrame:inView:] + 627 | |
| frame #42: 0x000000010008a5fe iPhoto Library Manager`-[IPListItemCell drawInteriorWithFrame:inView:] + 942 at IPListItemCell.m:171 | |
| frame #43: 0x00007fff87939d9e AppKit`-[NSTableView drawRow:clipRect:] + 2131 | |
| frame #44: 0x00007fff87929c93 AppKit`-[NSTableView drawRowIndexes:clipRect:] + 397 | |
| frame #45: 0x00007fff87928676 AppKit`-[NSTableView drawRect:] + 1269 | |
| frame #46: 0x00007fff8780ca94 AppKit`-[NSView _drawRect:clip:] + 4217 | |
| frame #47: 0x00007fff8780b0f1 AppKit`-[NSView _recursiveDisplayAllDirtyWithLockFocus:visRect:] + 1656 | |
| frame #48: 0x00007fff8780b509 AppKit`-[NSView _recursiveDisplayAllDirtyWithLockFocus:visRect:] + 2704 | |
| frame #49: 0x00007fff87809122 AppKit`-[NSView _recursiveDisplayRectIfNeededIgnoringOpacity:isVisibleRect:rectIsVisibleRectForView:topView:] + 817 | |
| frame #50: 0x00007fff8780a474 AppKit`-[NSView _recursiveDisplayRectIfNeededIgnoringOpacity:isVisibleRect:rectIsVisibleRectForView:topView:] + 5763 | |
| frame #51: 0x00007fff8780a474 AppKit`-[NSView _recursiveDisplayRectIfNeededIgnoringOpacity:isVisibleRect:rectIsVisibleRectForView:topView:] + 5763 | |
| frame #52: 0x00007fff8780a474 AppKit`-[NSView _recursiveDisplayRectIfNeededIgnoringOpacity:isVisibleRect:rectIsVisibleRectForView:topView:] + 5763 | |
| frame #53: 0x00007fff8780a474 AppKit`-[NSView _recursiveDisplayRectIfNeededIgnoringOpacity:isVisibleRect:rectIsVisibleRectForView:topView:] + 5763 | |
| frame #54: 0x00007fff8780a474 AppKit`-[NSView _recursiveDisplayRectIfNeededIgnoringOpacity:isVisibleRect:rectIsVisibleRectForView:topView:] + 5763 | |
| frame #55: 0x00007fff8780a474 AppKit`-[NSView _recursiveDisplayRectIfNeededIgnoringOpacity:isVisibleRect:rectIsVisibleRectForView:topView:] + 5763 | |
| frame #56: 0x00007fff8780a474 AppKit`-[NSView _recursiveDisplayRectIfNeededIgnoringOpacity:isVisibleRect:rectIsVisibleRectForView:topView:] + 5763 | |
| frame #57: 0x00007fff87808b73 AppKit`-[NSThemeFrame _recursiveDisplayRectIfNeededIgnoringOpacity:isVisibleRect:rectIsVisibleRectForView:topView:] + 314 | |
| frame #58: 0x00007fff8780479d AppKit`-[NSView _displayRectIgnoringOpacity:isVisibleRect:rectIsVisibleRectForView:] + 4675 | |
| frame #59: 0x00007fff877ce703 AppKit`-[NSView displayIfNeeded] + 1830 | |
| frame #60: 0x00007fff877cdc3c AppKit`_handleWindowNeedsDisplayOrLayoutOrUpdateConstraints + 738 | |
| frame #61: 0x00007fff87d95c81 AppKit`__83-[NSWindow _postWindowNeedsDisplayOrLayoutOrUpdateConstraintsUnlessPostingDisabled]_block_invoke_01208 + 46 | |
| frame #62: 0x00007fff8529e0c7 CoreFoundation`__CFRUNLOOP_IS_CALLING_OUT_TO_AN_OBSERVER_CALLBACK_FUNCTION__ + 23 | |
| frame #63: 0x00007fff8529e031 CoreFoundation`__CFRunLoopDoObservers + 369 | |
| frame #64: 0x00007fff852794a8 CoreFoundation`__CFRunLoopRun + 728 | |
| frame #65: 0x00007fff85278dd2 CoreFoundation`CFRunLoopRunSpecific + 290 | |
| frame #66: 0x00007fff9034b774 HIToolbox`RunCurrentEventLoopInMode + 209 | |
| frame #67: 0x00007fff9034b512 HIToolbox`ReceiveNextEventCommon + 356 | |
| frame #68: 0x00007fff9034b3a3 HIToolbox`BlockUntilNextEventMatchingListInMode + 62 | |
| frame #69: 0x00007fff877cafa3 AppKit`_DPSNextEvent + 685 | |
| frame #70: 0x00007fff877ca862 AppKit`-[NSApplication nextEventMatchingMask:untilDate:inMode:dequeue:] + 128 | |
| frame #71: 0x00007fff877c1c03 AppKit`-[NSApplication run] + 517 | |
| frame #72: 0x00007fff87766656 AppKit`NSApplicationMain + 869 | |
| frame #73: 0x000000010004a392 iPhoto Library Manager`main + 34 at main.m:23 | |
| frame #74: 0x0000000100002014 iPhoto Library Manager`start + 52 | |
| (lldb) frame select 3 | |
| frame #3: 0x00007fff89387efb OpenCL`clFinish + 120 | |
| OpenCL`clFinish + 120: | |
| -> 0x7fff89387efb: jmp 0x7fff89387f06 ; clFinish + 131 | |
| 0x7fff89387efd: leaq -32(%rbp), %rdi | |
| 0x7fff89387f01: callq 0x7fff89387e02 ; ___lldb_unnamed_function434$$OpenCL | |
| 0x7fff89387f06: testb $1, 136(%rbx) | |
| (lldb) disassemble -f | |
| OpenCL`clFinish: | |
| 0x7fff89387e83: pushq %rbp | |
| 0x7fff89387e84: movq %rsp, %rbp | |
| 0x7fff89387e87: pushq %r14 | |
| 0x7fff89387e89: pushq %rbx | |
| 0x7fff89387e8a: subq $16, %rsp | |
| 0x7fff89387e8e: movq %rdi, %rbx | |
| 0x7fff89387e91: movq %rbx, %rdi | |
| 0x7fff89387e94: callq 0x7fff89372b4e ; ___lldb_unnamed_function288$$OpenCL | |
| 0x7fff89387e99: movl $4294967260, %r14d | |
| 0x7fff89387e9f: testq %rax, %rax | |
| 0x7fff89387ea2: je 0x7fff89387f13 ; clFinish + 144 | |
| 0x7fff89387ea4: testb $1, 136(%rbx) | |
| 0x7fff89387eab: jne 0x7fff89387ecf ; clFinish + 76 | |
| 0x7fff89387ead: movq 112(%rbx), %rdi | |
| 0x7fff89387eb1: movl $4294967260, %r14d | |
| 0x7fff89387eb7: leaq 140054(%rip), %rdx ; "clFinish failed: queue (%p) has been invalidated." | |
| 0x7fff89387ebe: movl $4294967260, %esi | |
| 0x7fff89387ec3: movq %rbx, %rcx | |
| 0x7fff89387ec6: xorb %al, %al | |
| 0x7fff89387ec8: callq 0x7fff89371ffc ; ___lldb_unnamed_function274$$OpenCL | |
| 0x7fff89387ecd: jmp 0x7fff89387f13 ; clFinish + 144 | |
| 0x7fff89387ecf: movq %rbx, -32(%rbp) | |
| 0x7fff89387ed3: movl $0, -24(%rbp) | |
| 0x7fff89387eda: movq 120(%rbx), %r14 | |
| 0x7fff89387ede: callq 0x7fff8939fc1e ; symbol stub for: dispatch_get_current_queue | |
| 0x7fff89387ee3: cmpq %rax, %r14 | |
| 0x7fff89387ee6: je 0x7fff89387efd ; clFinish + 122 | |
| 0x7fff89387ee8: leaq -32(%rbp), %rsi | |
| 0x7fff89387eec: leaq -241(%rip), %rdx ; ___lldb_unnamed_function434$$OpenCL | |
| 0x7fff89387ef3: movq %r14, %rdi | |
| 0x7fff89387ef6: callq 0x7fff8939fc48 ; symbol stub for: dispatch_sync_f | |
| -> 0x7fff89387efb: jmp 0x7fff89387f06 ; clFinish + 131 | |
| 0x7fff89387efd: leaq -32(%rbp), %rdi | |
| 0x7fff89387f01: callq 0x7fff89387e02 ; ___lldb_unnamed_function434$$OpenCL | |
| 0x7fff89387f06: testb $1, 136(%rbx) | |
| 0x7fff89387f0d: je 0x7fff89387ead ; clFinish + 42 | |
| 0x7fff89387f0f: movl -24(%rbp), %r14d | |
| 0x7fff89387f13: movl %r14d, %eax | |
| 0x7fff89387f16: addq $16, %rsp | |
| 0x7fff89387f1a: popq %rbx | |
| 0x7fff89387f1b: popq %r14 | |
| 0x7fff89387f1d: popq %rbp | |
| 0x7fff89387f1e: ret | |
| (lldb) |
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Examining things further, there is also an IKImageBrowserView with a whole bunch of background tasks waiting on the main thread, so I'm thinking that might just be clogging up the default dispatch queue, and not allowing this dispatch_sync_f() to sneak in anywhere.