Memory-related crash

[kvaDrug]

Hello! I'm looking to solve the crash in my app, a WatchKit complication, to be precise. I already searched all of the common places - no clues. I came here since the crash log contains lzfse symbols, so may be you know the source of this bug.

The error I get:

Thread 1: EXC_RESOURCE (RESOURCE_TYPE_MEMORY: high watermark memory limit exceeded) (limit=15 MB)

The call stack:

Thread 1 Queue : com.apple.main-thread (serial)
#0	0x507c8864 in lzfseDecode ()
#1	0x507c788c in lzfse_decode_buffer ()
#2	0x507c645c in compression_decode_buffer ()
#3	0x52200ff0 in Deepmap2DecodeDefault ()
#4	0x5221d184 in DecodeTiledImage ()
#5	0x521ea5a4 in vImageDeepmap2Decode ()
#6	0x41ea601c in __CUIUncompressDeepmap2ImageData_block_invoke ()
#7	0x41ea074c in CUIUncompressDeepmap2ImageData ()
#8	0x41ea4548 in -[_CSIRenditionBlockData expandCSIBitmapData:fromSlice:makeReadOnly:] ()
#9	0x41ea1d48 in __csiCompressImageProviderCopyImageBlockSetWithOptions ()
#10	0x2d7cdcd8 in IIOImagePixelDataProvider::getBytesImageProvider(void*, unsigned long) ()
#11	0x2d7dac6c in PNGWritePlugin::writePNG(IIOImagePixelDataProvider*, IIODictionary*) ()
#12	0x2d7e1d64 in PNGWritePlugin::writeAll() ()
#13	0x2d7da558 in PNGWritePlugin::WriteProc(void*, void*, void*, void*) ()
#14	0x2d7cd044 in IIOImageDestination::finalizeDestination() ()
#15	0x2d807770 in CGImageDestinationFinalize ()
#16	0x244cd564 in ___lldb_unnamed_symbol212136 ()
#17	0x244cd0ec in ___lldb_unnamed_symbol212135 ()
#18	0x244cebfc in ___lldb_unnamed_symbol212193 ()
#19	0x2402f64c in ___lldb_unnamed_symbol166857 ()
#20	0x2402c180 in ___lldb_unnamed_symbol166740 ()
#21	0x2402cdec in ___lldb_unnamed_symbol166744 ()
#22	0x2402ca94 in ___lldb_unnamed_symbol166742 ()
#23	0x244cc404 in ___lldb_unnamed_symbol212112 ()
#24	0x244cce08 in ___lldb_unnamed_symbol212134 ()
#25	0x23b3f110 in ___lldb_unnamed_symbol123404 ()
#26	0x241fed00 in ___lldb_unnamed_symbol183123 ()
#27	0x241fce70 in ___lldb_unnamed_symbol183102 ()
#28	0x241fcf54 in ___lldb_unnamed_symbol183102 ()
#29	0x241fcf54 in ___lldb_unnamed_symbol183102 ()
#30	0x241fcf54 in ___lldb_unnamed_symbol183102 ()
#31	0x241fcf54 in ___lldb_unnamed_symbol183102 ()
#32	0x23c0e600 in ___lldb_unnamed_symbol130598 ()
#33	0x23c10a20 in ___lldb_unnamed_symbol130761 ()
#34	0x242f05e4 in ___lldb_unnamed_symbol193041 ()
#35	0x23c0dbf0 in ___lldb_unnamed_symbol130593 ()
#36	0x23c0e888 in ___lldb_unnamed_symbol130605 ()
#37	0x23c0e7ac in ___lldb_unnamed_symbol130604 ()
#38	0x23c0e9e8 in ___lldb_unnamed_symbol130607 ()
#39	0x27b5dc48 in ___lldb_unnamed_symbol5926 ()
#40	0x27ae5124 in ___lldb_unnamed_symbol2483 ()
#41	0x27ae4558 in ___lldb_unnamed_symbol2482 ()
#42	0x27b9f844 in ___lldb_unnamed_symbol7756 ()
#43	0x26214138 in _dispatch_call_block_and_release ()
#44	0x262159ac in _dispatch_client_callout ()
#45	0x2622246c in _dispatch_main_queue_drain ()
#46	0x262220c4 in _dispatch_main_queue_callback_4CF ()
#47	0x1d0aede4 in __CFRUNLOOP_IS_SERVICING_THE_MAIN_DISPATCH_QUEUE__ ()
#48	0x1d08274c in __CFRunLoopRun ()
#49	0x1d0c76bc in CFRunLoopRunSpecific ()
#50	0x1baf5d78 in -[NSRunLoop(NSRunLoop) runMode:beforeDate:] ()
#51	0x1bb2ec14 in -[NSRunLoop(NSRunLoop) run] ()
#52	0x50520c3c in _xpc_objc_main ()
#53	0x50522d64 in _xpc_main ()
#54	0x50522f24 in xpc_main ()
#55	0x1bb66208 in -[NSXPCListener resume] ()
#56	0x3351142c in -[_EXRunningExtension resume] ()
#57	0x335112dc in -[_EXRunningExtension startWithArguments:count:] ()
#58	0x3352e52c in EXExtensionMain ()
#59	0x1c2644b8 in NSExtensionMain ()
#60	0x4e69167c in start ()

Looking at the stack I assume that I have some sort of memory leak connected with PNG image. Normal complication memory is 6.8MB, but sometimes it starts rapidly grow and after 3-5 sec it reaches the 15 MB limit.

My complication doesn't use any heavy images. I commented out all of them, I also commented out all custom fonts, just in case. The crash is still there.