Hello, I know, I am touching a hot iron, when claiming that sqlite might have a memory leak. But I am trying to debug memory leaks related to sqlite now since 4 days and I am running against walls. Here is my problem:
- I am writing an iPhone app using iOS 8.2, Xcode 4.2, sqlite 3.8.8.3. - The memory leak appears in the iPhone simulator more often, than on an original iPhone device, but it appears always. - The leak appears with totally different type of queries. It might be, that a leak appears in a specific query in one debug session and in another debug session, it doesn?t (which makes it difficult to debug and drives me totally nuts). For me it seems to be related to a timing/threading issue. This is why it makes not much sense to offer some code here. - When debugging inside sqlite the leak is always related to the same code line, independent from the type of database command (select, insert, delete). - It appears always with the memory allocation in sqlite.c line 16872 in function sqlite3MemMalloc Here is the line: void *p = SQLITE_MALLOC( nByte ); - The leaked memory has always a size of nByte = 4344 bytes. - Here is a typical call stack up to the leaked code: 0 libsystem_malloc.dylib malloc_zone_malloc 1 MYAPP sqlite3MemMalloc sqlite3.c:16872 2 MYAPP mallocWithAlarm sqlite3.c:20510 3 MYAPP sqlite3Malloc sqlite3.c:20541 4 MYAPP pcache1Alloc sqlite3.c:39749 5 MYAPP pcache1AllocPage sqlite3.c:39833 6 MYAPP pcache1FetchStage2 sqlite3.c:40266 7 MYAPP pcache1Fetch sqlite3.c:40367 8 MYAPP sqlite3PcacheFetch sqlite3.c:39119 9 MYAPP sqlite3PagerAcquire sqlite3.c:46573 10 MYAPP btreeGetPage sqlite3.c:54380 11 MYAPP getAndInitPage sqlite3.c:54435 12 MYAPP moveToRoot sqlite3.c:57233 13 MYAPP sqlite3BtreeMovetoUnpacked sqlite3.c:57465 14 MYAPP sqlite3VdbeExec sqlite3.c:74055 15 MYAPP sqlite3Step sqlite3.c:68839 16 MYAPP sqlite3_step sqlite3.c:68905 17 MYAPP -[FMResultSet nextWithError:] FMResultSet.m:155 18 MYAPP -[FMResultSet next] FMResultSet.m:150 19 MYAPP __40-[MYAPPAppDelegate loadPreferences]_block_invoke MYAPPAppDelegate.m:323 20 MYAPP __30-[FMDatabaseQueue inDatabase:]_block_invoke FMDatabaseQueue.m:150 21 libdispatch.dylib _dispatch_client_callout 22 libdispatch.dylib _dispatch_barrier_sync_f_invoke 23 MYAPP -[FMDatabaseQueue inDatabase:] FMDatabaseQueue.m:147 24 MYAPP -[MYAPPAppDelegate loadPreferences] MYAPPAppDelegate.m:321 25 MYAPP -[MYAPPAppDelegate application:didFinishLaunchingWithOptions:] MYAPPAppDelegate.m:157 26 UIKit -[UIApplication _handleDelegateCallbacksWithOptions:isSuspended:restoreState:] 27 UIKit -[UIApplication _callInitializationDelegatesForMainScene:transitionContext:] 28 UIKit -[UIApplication _runWithMainScene:transitionContext:completion:] 29 UIKit -[UIApplication workspaceDidEndTransaction:] 30 FrontBoardServices __31-[FBSSerialQueue performAsync:]_block_invoke 31 CoreFoundation __CFRUNLOOP_IS_CALLING_OUT_TO_A_BLOCK__ 32 CoreFoundation __CFRunLoopDoBlocks 33 CoreFoundation __CFRunLoopRun 34 CoreFoundation CFRunLoopRunSpecific 35 UIKit -[UIApplication _run] 36 UIKit UIApplicationMain 37 MYAPP main main.m:16 38 libdyld.dylib start Does anybody have an idea how to debug something like this? Any help would be highly appreciated. Best regards Matthias Schmitt magic moving pixel s.a. 23, Avenue Grande-Duchesse Charlotte L-3441 Dudelange Luxembourg Phone: +352 54 75 75 http://www.mmp.lu
