Bus error when colliding with sensor

AaronWizard · Post by **AaronWizard** » Wed Mar 28, 2012 3:28 pm

I'm using the physics engine to handle collision detection and response. I have a bunch of coloured keys that players need to collect to open doors. These keys have a physics body and shape set to be a sensor. When players touch a key, the key's physics body is removed from the world. Except that right now I'm getting an error whenever I try to pick up a key.

The terminal reports a bus error while the problem report window that pops up after the crash shows this:

Code: Select all

Process:         love [617]
Path:            /Applications/love.app/Contents/MacOS/love
Identifier:      org.love2d.love
Version:         ??? (0.7.2)
Code Type:       X86 (Native)
Parent Process:  launchd [128]

Date/Time:       2012-03-28 12:12:34.011 -0300
OS Version:      Mac OS X 10.6.8 (10K549)
Report Version:  6

Interval Since Last Report:          139941 sec
Crashes Since Last Report:           53
Per-App Interval Since Last Report:  12198 sec
Per-App Crashes Since Last Report:   52
Anonymous UUID:                      471AF3B6-04C1-4F2C-96EB-E6735DF0F73B

Exception Type:  EXC_BAD_ACCESS (SIGBUS)
Exception Codes: KERN_PROTECTION_FAILURE at 0x0000000000000008
Crashed Thread:  0  Dispatch queue: com.apple.main-thread

Thread 0 Crashed:  Dispatch queue: com.apple.main-thread
0   org.love2d.love               	0x0002fe25 love::Reference::push() + 9
1   org.love2d.love               	0x0008070c love::physics::box2d::World::ContactCallback::process() + 100
2   org.love2d.love               	0x0008081d love::physics::box2d::World::update(float) + 51
3   org.love2d.love               	0x0007689f love::physics::box2d::w_World_update(lua_State*) + 79
4   com.yourcompany.Lua           	0x0059f623 luaD_precall + 890
5   com.yourcompany.Lua           	0x005b65f7 luaV_execute + 7461
6   com.yourcompany.Lua           	0x0059f895 luaD_call + 165
7   com.yourcompany.Lua           	0x00595145 f_call + 48
8   com.yourcompany.Lua           	0x0059eaba luaD_rawrunprotected + 73
9   com.yourcompany.Lua           	0x0059fc04 luaD_pcall + 99
10  com.yourcompany.Lua           	0x005951ea lua_pcall + 163
11  com.yourcompany.Lua           	0x0059acfd luaB_xpcall + 104
12  com.yourcompany.Lua           	0x0059f623 luaD_precall + 890
13  com.yourcompany.Lua           	0x005b65f7 luaV_execute + 7461
14  com.yourcompany.Lua           	0x0059f895 luaD_call + 165
15  com.yourcompany.Lua           	0x005950eb lua_call + 67
16  org.love2d.love               	0x0002fd94 SDL_main + 452
17  org.love2d.love               	0x00089447 -[SDLMain applicationDidFinishLaunching:] + 95
18  com.apple.Foundation          	0x98bafdb3 _nsnote_callback + 176
19  com.apple.CoreFoundation      	0x903ae763 __CFXNotificationPost + 947
20  com.apple.CoreFoundation      	0x903ae16a _CFXNotificationPostNotification + 186
21  com.apple.Foundation          	0x98ba4c50 -[NSNotificationCenter postNotificationName:object:userInfo:] + 128
22  com.apple.Foundation          	0x98bb205d -[NSNotificationCenter postNotificationName:object:] + 56
23  com.apple.AppKit              	0x96b25216 -[NSApplication _postDidFinishNotification] + 125
24  com.apple.AppKit              	0x96b25126 -[NSApplication _sendFinishLaunchingNotification] + 74
25  com.apple.AppKit              	0x96d3e9c5 -[NSApplication(NSAppleEventHandling) _handleAEOpenDocumentsForURLs:] + 975
26  com.apple.AppKit              	0x96c7bfe0 -[NSApplication(NSAppleEventHandling) _handleCoreEvent:withReplyEvent:] + 236
27  com.apple.Foundation          	0x98be51f8 -[NSAppleEventManager dispatchRawAppleEvent:withRawReply:handlerRefCon:] + 511
28  com.apple.Foundation          	0x98be4fbc _NSAppleEventManagerGenericHandler + 228
29  com.apple.AE                  	0x998f7f5c aeDispatchAppleEvent(AEDesc const*, AEDesc*, unsigned long, unsigned char*) + 166
30  com.apple.AE                  	0x998f7e5b dispatchEventAndSendReply(AEDesc const*, AEDesc*) + 43
31  com.apple.AE                  	0x998f7d65 aeProcessAppleEvent + 197
32  com.apple.HIToolbox           	0x97861197 AEProcessAppleEvent + 50
33  com.apple.AppKit              	0x96af57d2 _DPSNextEvent + 1420
34  com.apple.AppKit              	0x96af4dd6 -[NSApplication nextEventMatchingMask:untilDate:inMode:dequeue:] + 156
35  com.apple.AppKit              	0x96ab71f3 -[NSApplication run] + 821
36  org.love2d.love               	0x00089cbc main + 1882
37  org.love2d.love               	0x0002fa66 start + 54

Thread 1:  Dispatch queue: com.apple.libdispatch-manager
0   libSystem.B.dylib             	0x99fd0382 kevent + 10
1   libSystem.B.dylib             	0x99fd0a9c _dispatch_mgr_invoke + 215
2   libSystem.B.dylib             	0x99fcff59 _dispatch_queue_invoke + 163
3   libSystem.B.dylib             	0x99fcfcfe _dispatch_worker_thread2 + 240
4   libSystem.B.dylib             	0x99fcf781 _pthread_wqthread + 390
5   libSystem.B.dylib             	0x99fcf5c6 start_wqthread + 30

Thread 2:
0   libSystem.B.dylib             	0x99fa9b5a semaphore_timedwait_signal_trap + 10
1   libSystem.B.dylib             	0x99fd76e1 _pthread_cond_wait + 1066
2   libSystem.B.dylib             	0x9a0065a8 pthread_cond_timedwait_relative_np + 47
3   com.apple.audio.CoreAudio     	0x902f83ab CAGuard::WaitFor(unsigned long long) + 219
4   com.apple.audio.CoreAudio     	0x902fb3dd CAGuard::WaitUntil(unsigned long long) + 289
5   com.apple.audio.CoreAudio     	0x902f8cda HP_IOThread::WorkLoop() + 1892
6   com.apple.audio.CoreAudio     	0x902f8571 HP_IOThread::ThreadEntry(HP_IOThread*) + 17
7   com.apple.audio.CoreAudio     	0x902f8488 CAPThread::Entry(CAPThread*) + 140
8   libSystem.B.dylib             	0x99fd7259 _pthread_start + 345
9   libSystem.B.dylib             	0x99fd70de thread_start + 34

Thread 3:
0   libSystem.B.dylib             	0x99fa9c0e mach_wait_until + 10
1   libSystem.B.dylib             	0x9a031429 nanosleep + 345
2   SDL                           	0x0055a453 SDL_Delay + 99
3   org.love2d.love               	0x0003c65d love::audio::openal::Audio::run(void*) + 35
4   SDL                           	0x0054becd SDL_Linked_Version + 397
5   SDL                           	0x0055a1f1 SDL_SemWait + 49
6   libSystem.B.dylib             	0x99fd7259 _pthread_start + 345
7   libSystem.B.dylib             	0x99fd70de thread_start + 34

Thread 4:
0   libSystem.B.dylib             	0x99fa9c0e mach_wait_until + 10
1   libSystem.B.dylib             	0x9a031429 nanosleep + 345
2   SDL                           	0x0055a5c3 SDL_Delay + 467
3   SDL                           	0x0054becd SDL_Linked_Version + 397
4   SDL                           	0x0055a1f1 SDL_SemWait + 49
5   libSystem.B.dylib             	0x99fd7259 _pthread_start + 345
6   libSystem.B.dylib             	0x99fd70de thread_start + 34

Thread 0 crashed with X86 Thread State (32-bit):
  eax: 0x00000004  ebx: 0x00000002  ecx: 0x00000004  edx: 0x01127ae4
  edi: 0x00000001  esi: 0x0082e9d0  ebp: 0xbfffe308  esp: 0xbfffe2f0
   ss: 0x00000023  efl: 0x00010286  eip: 0x0002fe25   cs: 0x0000001b
   ds: 0x00000023   es: 0x00000023   fs: 0x00000000   gs: 0x0000000f
  cr2: 0x00000008

Binary Images:
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0x9a772000 - 0x9a77eff7  libkxld.dylib ??? (???) <9A441C48-2D18-E716-5F38-CBEAE6A0BB3E> /usr/lib/system/libkxld.dylib
0x9a77f000 - 0x9a7b2fff  libTrueTypeScaler.dylib ??? (???) <8ADB7D19-413E-4499-C874-13C383F97685> /System/Library/Frameworks/ApplicationServices.framework/Versions/A/Frameworks/ATS.framework/Versions/A/Resources/libTrueTypeScaler.dylib
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0xffff0000 - 0xffff1fff  libSystem.B.dylib ??? (???) <2DCD13E3-1BD1-6F25-119A-3863A3848B90> /usr/lib/libSystem.B.dylib

Model: iMac9,1, BootROM IM91.008D.B08, 2 processors, Intel Core 2 Duo, 3.06 GHz, 8 GB, SMC 1.45f0
Graphics: ATI Radeon HD 4850, ATI Radeon HD 4850, PCIe, 512 MB
Memory Module: global_name
AirPort: spairport_wireless_card_type_airport_extreme (0x14E4, 0x8E), Broadcom BCM43xx 1.0 (5.10.131.42.4)
Bluetooth: Version 2.4.5f3, 2 service, 12 devices, 1 incoming serial ports
Network Service: Ethernet, Ethernet, en0
Serial ATA Device: ST31000342ASQ, 931.51 GB
Serial ATA Device: OPTIARC DVD RW AD-5670S
USB Device: Built-in iSight, 0x05ac  (Apple Inc.), 0x8502, 0x24400000 / 3
USB Device: USB2.0 Hub, 0x05e3  (Genesys Logic, Inc.), 0x0608, 0x24300000 / 2
USB Device: LaCie Desktop Hard Drive, 0x059f  (LaCie), 0x1010, 0x24320000 / 4
USB Device: Keyboard Hub, 0x05ac  (Apple Inc.), 0x1006, 0x26400000 / 2
USB Device: Apple Keyboard, 0x05ac  (Apple Inc.), 0x0220, 0x26420000 / 3
USB Device: IR Receiver, 0x05ac  (Apple Inc.), 0x8242, 0x04500000 / 3
USB Device: Microsoft Wireless Optical Mouse® 1.00, 0x045e  (Microsoft Corporation), 0x00e1, 0x04100000 / 2
USB Device: PTK-640, 0x056a  (WACOM Co., Ltd.), 0x00b9, 0x06200000 / 3
USB Device: BRCM2046 Hub, 0x0a5c  (Broadcom Corp.), 0x4500, 0x06100000 / 2
USB Device: Bluetooth USB Host Controller, 0x05ac  (Apple Inc.), 0x8215, 0x06110000 / 6

If you try the game you will notice I'm using a narrow rectangle for the player character's collision shape which doesn't cover the sprite. I intend to have the rectangle and two circles covering the sprite to give it a capsule shape (though there will still be space at the top of the sprite so that it may overlap with some walls to give perspective). Using a single circle works fine. Using two circles causes a bus error though.

P.S. You will have to search for a key a bit.

kikito · Post by **kikito** » Wed Mar 28, 2012 6:26 pm

If I remember correctly, removing shapes during collisions tends to mean trouble, at least in 0.7.2. I don't know its state in 0.8.x .

The workaround seemed to involve "marking" the removed shape with a boolean or storing it in a "to-be-deleted" table, making it completely un-touchable (for example with masks or groups) so that it didn't interact with any other object on that frame and then removing it outside of the world.update() call. But this is from the top of my head, I could be wrong.

AaronWizard · Post by **AaronWizard** » Wed Mar 28, 2012 7:29 pm

I've tried adding bodies and shapes meant to be deleted to a list that I can clear later, instead of destroying the bodies and shapes immediately.

This gets rid of the crash, but I have discovered that the callbacks for player/key collision and player/door collision seem to be getting called twice. And it doesn't seem to be the case of it calling (key, actor) then (actor, key); it's always [(key, actor), (key, actor)] and [(door, actor), (door, actor)]. This has the side effect of giving me two keys of the same colour whenever I pick up one.

: double_keys.png (40.59 KiB) Viewed 2067 times

meoiswa · Post by **meoiswa** » Thu Mar 29, 2012 3:30 pm

AFAIK this is completelly normal, those triggers always return the shapes in a "random, but orderly" manner. What I mean is that when two shapes collide, you get the hook called for shapes a and b without knowing which is which, however, every time this two shapes collide, the hook is called in the same order.

For your problem of having two keys, try this:

Set the shape's "data" to point to the object that owns this shape (For example, the player's shape has the data field pointing to the player). This way, when two shapes collide you can always access their data, and through it the object, and then maybe read the "will delete on next update" variable which you set to "true" to avoid crashing when deleting a colliding shape. If that variable is false, then give the player the key (or whatever) and mark the object for deletion, else, do nothing.

You can also avoid the crash when objects are colliding by setting the shape's "mask" to all possible values, and then deleting it on the very next frame.

TL;DR: set the shapes data to point to the parent object, then do magic.

AaronWizard · Post by **AaronWizard** » Thu Mar 29, 2012 4:26 pm

meoiswa wrote:AFAIK this is completelly normal, those triggers always return the shapes in a "random, but orderly" manner. What I mean is that when two shapes collide, you get the hook called for shapes a and b without knowing which is which, however, every time this two shapes collide, the hook is called in the same order.

OK, though this doesn't explain why the callback gets called twice when the two shapes collide.

meoiswa · Post by **meoiswa** » Thu Mar 29, 2012 6:48 pm

There's a callback for "a colliding with b" and "b colliding with a". There's also no reliable way to predict which shape will be "a" and which will be "b", that's why I suggest adding a reference to the object in the shape's data, so you can do conditionals for testing which is what .

... I just realized i'm talking about Box2D and not Hardon. Might still be the same issue.

For example, in Box2d::

Code: Select all

function add(a, b, coll)
        --If player and sensor shape for the base collide, you can dock
	if (a.class=="player" and b.class=="base") then
        -- If we do something like: 
        --    if (a.class == "player" and b.class=="base") or (a.class =="base" and b.class == "player") then
        --    We end up running the code twice because of the collision "between a and b" and "between b and a"
		player.canDock = player.canDock+1
		player.dockID = b.id
	end
        --if player and debris collide, destroy debris safely, by masking it entirely and then deleting the object that holds it.
	if (a.class=="player" and b.class=="debris") then
		for k,v in pairs(game.objects) do
			if v==b.object then
				--Remove the shape's collisions so that they don't collide until the garbace collector
				--gets rid of them
				b.object.shape:setMask(1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 12, 13, 14, 15, 16)		
				--Remove the object from the game's physics pool
				table.remove(game.objects,k)
			end
		end
	end
end

Bus error when colliding with sensor

Bus error when colliding with sensor

Re: Bus error when colliding with sensor

Re: Bus error when colliding with sensor

Re: Bus error when colliding with sensor

Re: Bus error when colliding with sensor

Re: Bus error when colliding with sensor

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