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al_get_target_bitmap returning a destroyed bitmap
Edgar Reynaldo
Member #8,592
May 2007
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This is a continuation of an older thread that got locked (https://www.allegro.cc/forums/thread/615871).

I am still trying to debug a crash in my ManyMouse project where it crashes in al_hold_bitmap_drawing(false). I am using al_hold_bitmap_drawing(false); because before my code was crashing on a failed assert when Allegro calls ASSERT(!al_is_bitmap_drawing_held()). When I don't call al_hold_bitmap_drawing(false) though, it crashes on al_set_target_bitmap (but not reliably).

Here is a backtrace :

#SelectExpand
1 2c:\Research\RawInput\RainDropMouse\ManyMouse\cbbuild\bin>gdb RawDebug.exe 3GNU gdb (GDB) 7.6.1 4Copyright (C) 2013 Free Software Foundation, Inc. 5License GPLv3+: GNU GPL version 3 or later <http://gnu.org/licenses/gpl.html> 6This is free software: you are free to change and redistribute it. 7There is NO WARRANTY, to the extent permitted by law. Type "show copying" 8and "show warranty" for details. 9This GDB was configured as "mingw32". 10For bug reporting instructions, please see: 11<http://www.gnu.org/software/gdb/bugs/>... 12Reading symbols from c:\Research\RawInput\RainDropMouse\ManyMouse\cbbuild\bin\RawDebug.exe...done. 13(gdb) run 14Starting program: c:\Research\RawInput\RainDropMouse\ManyMouse\cbbuild\bin/RawDebug.exe 15[New Thread 1024.0x1680] 16Thread ID of main function is 0x00001680 17[New Thread 1024.0xafc] 18CreateAllegroBitmap : Created 16 X 24 allegro bitmap fcfs_mouse_buffer at 0028f140 on thread 5760 attached to display 00000000 19Hook dll loaded successfully 20LowLevelMouseHook loaded successfully. 21MouseHook loaded successfully. 22StartMouse loaded successfully. 23StopMouse loaded successfully. 24SetWindowsHookEx(WH_MOUSE_LL) succeeded. 25SetWindowsHookEx(WH_MOUSE) succeeded. 26ShellHook loaded successfully 27SetWindowsHookEx(WH_SHELL) succeeded 28log.InitMutex() returned true 29InitTree() returned true 30BFD: C:\Windows\system32\atiumdva.dll: Warning: Ignoring section flag IMAGE_SCN_MEM_NOT_PAGED in section .text 31BFD: C:\Windows\system32\atiumdva.dll: Warning: Ignoring section flag IMAGE_SCN_MEM_NOT_PAGED in section .rdata 32BFD: C:\Windows\system32\atiumdva.dll: Warning: Ignoring section flag IMAGE_SCN_MEM_NOT_PAGED in section .data 33[New Thread 1024.0x1320] 34[New Thread 1024.0x1764] 35[New Thread 1024.0x6ec] 36[New Thread 1024.0xf6c] 37[New Thread 1024.0xd08] 38[New Thread 1024.0x11e0] 39CreateAllegroDisplay : Created 640 X 400 allegro display RawInputHandler::display at 029f1b68 on thread 5760 with backbuffer 029f1dc0 40CreateAllegroBitmap : Created 1280 X 800 allegro bitmap RawInputHandler::allegro_buffer at 029f8cb8 on thread 5760 attached to display 029f1b68 41[New Thread 1024.0x844] 42[New Thread 1024.0x143c] 43[New Thread 1024.0x1110] 44CreateAllegroDisplay : Created 1024 X 300 allegro display RawInputHandler::log_display at 029f96e0 on thread 5760 with backbuffer 029f9938 45Images loaded successfully 46Couldn't set WS_EX_LAYERED style attribute 47Thread ID of callback process is 0x00001320 48WindowHandler::EnumerateWindows After EnumerateTree 49Desktop window handle = 00010010 50Shell window handle = 000200e8 51Taskbar window handle = 00010054 52Num raw input devices detected = 13 53InitRawInfo was successful 54RegisterDevices was successful 55[New Thread 1024.0x133c] 56Adding mouse device #1 57[New Thread 1024.0x16a8] 58[New Thread 1024.0x11cc] 59[New Thread 1024.0x10b8] 60[New Thread 1024.0xd48] 61Adding mouse device #2 62[New Thread 1024.0x14a0] 63[New Thread 1024.0x10f0] 64[New Thread 1024.0x438] 65[New Thread 1024.0x1398] 66FCFS DrawPointers : Setting image for mouse device #1 67[New Thread 1024.0x938] 68[New Thread 1024.0x17f8] 69[New Thread 1024.0x1418] 70[New Thread 1024.0x11d8] 71FCFS DrawPointers : Setting image for mouse device #2 72[New Thread 1024.0x13e4] 73[New Thread 1024.0xe40] 74[New Thread 1024.0x17e4] 75[New Thread 1024.0x1424] 76 77Program received signal SIGSEGV, Segmentation fault. 78[Switching to Thread 1024.0x1320] 790x67720969 in al_hold_bitmap_drawing (hold=false) at C:\mingw\LIBS\A5112release\allegro\src\display.c:520 80520 current_display->vt->flush_vertex_cache(current_display); 81(gdb) bt 82#0 0x67720969 in al_hold_bitmap_drawing (hold=false) at C:\mingw\LIBS\A5112release\allegro\src\display.c:520 83#1 0x648823aa in AllegroSetTargetBitmap (bmp=0x2ac5d88, name=0x648a2194 <MouseController::SetMouseStrategy(MOUSE_STRATEGY)::__func__+1173> "fcfs_mouse_buffer") at C:\Research\RawInput\RainDropMouse\ManyMouse\src\AllegroAndWindows.cpp:517 84#2 0x648855cd in FCFSMouseStrategy::DrawPointers (this=0x22fa98, strategy_state=FCFS_STATE_PROCESSING_CLICK) at C:\Research\RawInput\RainDropMouse\ManyMouse\src\MouseStrategyFCFS.cpp:159 85#3 0x64885929 in FCFSMouseStrategy::SetFCFSStrategyState (this=0x22fa98, new_state=FCFS_STATE_PROCESSING_CLICK) at C:\Research\RawInput\RainDropMouse\ManyMouse\src\MouseStrategyFCFS.cpp:215 86#4 0x6488509b in FCFSMouseStrategy::HandleInput (this=0x22fa98, input=..., process_input=true) at C:\Research\RawInput\RainDropMouse\ManyMouse\src\MouseStrategyFCFS.cpp:83 87#5 0x64884f48 in FCFSMouseStrategy::HandleInput (this=0x22fa98, input=...) at C:\Research\RawInput\RainDropMouse\ManyMouse\src\MouseStrategyFCFS.cpp:49 88#6 0x648840bb in MouseController::HandleRawInput (this=0x22fa78, rawinput=...) at C:\Research\RawInput\RainDropMouse\ManyMouse\src\MouseController.cpp:156 89#7 0x00404651 in _fu68___ZN9ManyMouse3logE () at C:\Research\RawInput\RainDropMouse\ManyMouse\src\RawInputHandler.cpp:1408 90#8 0x00404264 in _fu60___ZN9ManyMouse3logE () at C:\Research\RawInput\RainDropMouse\ManyMouse\src\RawInputHandler.cpp:1210 91#9 0x0040177a in _fu0___ZN9ManyMouse3logE () at C:\Research\RawInput\RainDropMouse\ManyMouse\src\RawInputHandler.cpp:44 92#10 0x6779cf46 in window_callback (hWnd=0xa0a3e, message=255, wParam=0, lParam=4008103) at C:\mingw\LIBS\A5112release\allegro\src\win\wwindow.c:428 93#11 0x75eef8d2 in USER32!GetMessageW () from C:\Windows\system32\user32.dll 94#12 0x75eef794 in USER32!GetWindowLongW () from C:\Windows\system32\user32.dll 95#13 0x6779cd3f in accept_mouse_event () at C:\mingw\LIBS\A5112release\allegro\src\win\wwindow.c:372 96#14 0x000a0a3e in ?? () 97#15 0x000000ff in ?? () 98#16 0x00000000 in ?? () 99(gdb) bt 3 full 100#0 0x67720969 in al_hold_bitmap_drawing (hold=false) at C:\mingw\LIBS\A5112release\allegro\src\display.c:520 101 current_display = 0x2a94ef8 102#1 0x648823aa in AllegroSetTargetBitmap (bmp=0x2ac5d88, name=0x648a2194 <MouseController::SetMouseStrategy(MOUSE_STRATEGY)::__func__+1173> "fcfs_mouse_buffer") at C:\Research\RawInput\RainDropMouse\ManyMouse\src\AllegroAndWindows.cpp:517 103No locals. 104#2 0x648855cd in FCFSMouseStrategy::DrawPointers (this=0x22fa98, strategy_state=FCFS_STATE_PROCESSING_CLICK) at C:\Research\RawInput\RainDropMouse\ManyMouse\src\MouseStrategyFCFS.cpp:159 105 m = 0x2a228f8 106 i = 0 107 __func__ = "DrawPointers" 108 image = 0x0 109 mouse_vec = {<std::_Vector_base<Mouse*, std::allocator<Mouse*> >> = {_M_impl = {<std::allocator<Mouse*>> = {<__gnu_cxx::new_allocator<Mouse*>> = {<No data fields>}, <No data fields>}, _M_start = 0x2a8bff8, _M_finish = 0x2a8c000, _M_end_of_storage = 0x2a8c000}}, <No data fields>} 110(More stack frames follow...) 111(gdb) p al_get_current_display() 112$1 = (struct ALLEGRO_DISPLAY *) 0x2a94ef8 113(gdb) p PrintUserResources() 114$2 = void 115(gdb)

From my program's log and resource tracking I can see that the ALLEGRO_DISPLAY* at 0x2a94ef8 has already been destroyed. So for some reason _al_get_current_display is returning a destroyed display, and I can't figure out why.

If anyone wants to look at my code or try debugging this, PM me your email, and I'll send you a read only invitation to my bitbucket repository. It only builds with MinGW and CodeBlocks atm, and it's windows only (XP or higher). It needs Allegro 5.1.12 or later, and the patch for Allegro I provided here (https://www.allegro.cc/forums/thread/615913/1018200#target).

Edit
Sometimes it is not the display that has been destroyed, but a bitmap, and it crashes in a slightly different spot. But it always crashes at the same point of my program.

Niunio
Member #1,975
March 2002
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Just wondering: Did you put a break on "al_destroy_display" to see if it's called somewhere?

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Current projects: Allegro.pas | MinGRo

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