NSCache / libcache BIG BAD deadlock
| Originator: | me | ||
| Number: | rdar://10916098 | Date Originated: | 22-Feb-2012 06:18 PM |
| Status: | Open | Resolved: | |
| Product: | Mac OS X | Product Version: | 10.7.3 (11D50) |
| Classification: | Crash/Hang/Data Loss | Reproducible: | I Didn't Try |
I hit what appears to be a deadlock situation, creating an NSCache while a background queue is destroying one. I paused the app after it spun for about 5 seconds. After examining the state in the debugger for a while, the app received SIGABRT. I suspect someone else on the system sent that (since it would apparently have failed to react to the memory pressure warning?). That crash report is attached. Thread 1 is creating an NSCache instance with +[NSCache new] (frame 4). LIFancyCoverCache is not an NSCache subclass, btw. It appears that Thread 1 and Thread 13 are messaging two different cache instances: <NSCache: 0x10f17c1d0> on Thread 1, <NSCache: 0x10c4f3590> on Thread 13. (At least, that's what were in $rbx on each thread.) Here are the backtraces for the two threads in question. The backtrace of all threads is a separate attachment. Thread 1, Queue : com.apple.main-thread #0 0x00007fff88e2abf2 in __psynch_mutexwait () #1 0x00007fff8dca51a1 in pthread_mutex_lock () #2 0x00007fff90548905 in cache_create () #3 0x00007fff947f1a9c in -[NSCache init] () #4 0x00007fff947cb3b2 in +[NSObject new] () #5 0x000000010026cc4a in -[LIFancyCoverCache init] at /Users/jonathon/Documents/Streams/Delicious Monster/UberLibrary/Library/LIFancyCoverCache.m:39 #6 0x00007fff947cb3b2 in +[NSObject new] () #7 0x000000010026cf92 in +[LIFancyCoverCache fancyCoverCacheForSize:] () #8 0x000000010025ecce in -[LICoverImageView drawRect:] () #9 0x00007fff8ce09abe in -[NSView _drawRect:clip:] () #10 0x00007fff8ce371eb in -[NSView _recursiveDisplayAllDirtyWithLockFocus:visRect:] () #11 0x00007fff8ce37617 in -[NSView _recursiveDisplayAllDirtyWithLockFocus:visRect:] () #12 0x00007fff8ce37617 in -[NSView _recursiveDisplayAllDirtyWithLockFocus:visRect:] () #13 0x00007fff8ce37617 in -[NSView _recursiveDisplayAllDirtyWithLockFocus:visRect:] () #14 0x00007fff8ce37617 in -[NSView _recursiveDisplayAllDirtyWithLockFocus:visRect:] () #15 0x00007fff8ce37617 in -[NSView _recursiveDisplayAllDirtyWithLockFocus:visRect:] () #16 0x00007fff8ce37617 in -[NSView _recursiveDisplayAllDirtyWithLockFocus:visRect:] () #17 0x00007fff8ce07099 in -[NSView _recursiveDisplayRectIfNeededIgnoringOpacity:isVisibleRect:rectIsVisibleRectForView:topView:] () #18 0x00007fff8ce0834e in -[NSView _recursiveDisplayRectIfNeededIgnoringOpacity:isVisibleRect:rectIsVisibleRectForView:topView:] () #19 0x00007fff8ce0834e in -[NSView _recursiveDisplayRectIfNeededIgnoringOpacity:isVisibleRect:rectIsVisibleRectForView:topView:] () #20 0x00007fff8ce0834e in -[NSView _recursiveDisplayRectIfNeededIgnoringOpacity:isVisibleRect:rectIsVisibleRectForView:topView:] () #21 0x00007fff8ce0834e in -[NSView _recursiveDisplayRectIfNeededIgnoringOpacity:isVisibleRect:rectIsVisibleRectForView:topView:] () #22 0x00007fff8ce0834e in -[NSView _recursiveDisplayRectIfNeededIgnoringOpacity:isVisibleRect:rectIsVisibleRectForView:topView:] () #23 0x00007fff8ce0834e in -[NSView _recursiveDisplayRectIfNeededIgnoringOpacity:isVisibleRect:rectIsVisibleRectForView:topView:] () #24 0x00007fff8ce0834e in -[NSView _recursiveDisplayRectIfNeededIgnoringOpacity:isVisibleRect:rectIsVisibleRectForView:topView:] () #25 0x00007fff8ce0834e in -[NSView _recursiveDisplayRectIfNeededIgnoringOpacity:isVisibleRect:rectIsVisibleRectForView:topView:] () #26 0x00007fff8ce0834e in -[NSView _recursiveDisplayRectIfNeededIgnoringOpacity:isVisibleRect:rectIsVisibleRectForView:topView:] () #27 0x00007fff8ce06593 in -[NSThemeFrame _recursiveDisplayRectIfNeededIgnoringOpacity:isVisibleRect:rectIsVisibleRectForView:topView:] () #28 0x00007fff8ce019af in -[NSView _displayRectIgnoringOpacity:isVisibleRect:rectIsVisibleRectForView:] () #29 0x00007fff8cdfa429 in -[NSView displayIfNeeded] () #30 0x00007fff8cdf9b69 in _handleWindowNeedsDisplayOrLayoutOrUpdateConstraints () #31 0x00007fff947e4bd7 in __CFRUNLOOP_IS_CALLING_OUT_TO_AN_OBSERVER_CALLBACK_FUNCTION__ () #32 0x00007fff947e4b36 in __CFRunLoopDoObservers () #33 0x00007fff947b9ce9 in __CFRunLoopRun () #34 0x00007fff947b9676 in CFRunLoopRunSpecific () #35 0x00007fff8fd2731f in RunCurrentEventLoopInMode () #36 0x00007fff8fd2e5c9 in ReceiveNextEventCommon () #37 0x00007fff8fd2e456 in BlockUntilNextEventMatchingListInMode () #38 0x00007fff8cdbdf5d in _DPSNextEvent () #39 0x00007fff8cdbd861 in -[NSApplication nextEventMatchingMask:untilDate:inMode:dequeue:] () #40 0x00007fff8cdba19d in -[NSApplication run] () #41 0x00007fff8d038b88 in NSApplicationMain () #42 0x0000000100002c87 in main () Thread 2, Queue : com.apple.libdispatch-manager Thread 7, Queue : (null) Thread 11 CVDisplayLink, Queue : (null) Thread 13, Queue : com.apple.root.default-priority #0 0x00007fff88e2abf2 in __psynch_mutexwait () #1 0x00007fff8dca51a1 in pthread_mutex_lock () #2 0x00007fff9054792a in cache_destroy () #3 0x00007fff948c39db in -[NSCache dealloc] () #4 0x00007fff94789ca0 in CFRelease () #5 0x00007fff905468e4 in _value_entry_remove () #6 0x00007fff905469cd in _entry_unmap () #7 0x00007fff90546a71 in _entry_evict () #8 0x00007fff90546b04 in _evict_last () #9 0x00007fff90546cf2 in _cache_enforce_limits () #10 0x00007fff90546ea5 in cache_handle_memory_pressure () #11 0x00007fff8a7d92b6 in _dispatch_source_invoke () #12 0x00007fff8a7d5f77 in _dispatch_queue_invoke () #13 0x00007fff8a7d5760 in _dispatch_worker_thread2 () #14 0x00007fff8dca83da in _pthread_wqthread () #15 0x00007fff8dca9b85 in start_wqthread () Thread 17 QTKit: QTCALayerRendererPendingQWorkLoop, Queue : (null) Thread 19 com.apple.NSURLConnectionLoader, Queue : (null) Thread 21 com.apple.CFSocket.private, Queue : (null) Thread 27, Queue : (null) Thread 28, Queue : (null)
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And again, while doing a parallel computation in the same app as before:
06-Mar-2012 03:24 AM Jonathon Mah:
06-Mar-2012 03:24 AM Jonathon Mah:
In recent days I've seen this two additional times. The first happened at the same place. The second happened in a completely different project, which was accessing an NSCache. It had been open for a while and I suspect reactivating it caused it to grab some memory, but no real RAM was free at the time, giving a memory warning and paging.