Is anyone aware of a way to debug EXC_BAD_ACCESS?

Paul6 · April 12, 2012, 8:58pm

I’ve had a few of these EXC_BAD_ACCESS issues before, i posted some I found in wx2.9 a while ago- the one I’ve currenly got is in 2.8.12.1. Before when I’ve seen them they’ve happened consistently and they’ve not been too hard to track down. Just cut chunks out of the code until they go away to narrow down the offending part, then step through the code until it hits. But I seem to have one lurking in my app which I’ve never personally seen occur, but the occasional person is reporting it to happen.

Is anyone aware of a way to find where this could be happening, or a way to debug it?

I found this which helped me understand more whats going on, but I dont know if that type of solution is possible at all in python?

Gadget_Steve · April 13, 2012, 6:52am

Take a look at the help files for wxStackWalker and
wxApp::OnFatalException they may suggest a strategy to include some
code that will at least let you release a version of the program
that will provide some useful debug information to allow you to find
the problem. Unfortunately most users do not give any indication of
having read the error messages that are provided.

Gadget/Steve

···

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Paul6 · April 13, 2012, 10:22am

Take a look at the help files for wxStackWalker and
wxApp::OnFatalException they may suggest a strategy to include some
code that will at least let you release a version of the program
that will provide some useful debug information to allow you to find
the problem. Unfortunately most users do not give any indication of
having read the error messages that are provided.
Gadget/Steve

I’ve read that in order for wxApp::OnFatalException to be called I need to turn on HandleFatalExceptions using this but I can’t find that method/function anywhere?

I’ve googled it a bit and is it required to build wx with a certain flag set to get this function?

Paul6 · April 13, 2012, 10:57am

I have the full error report if that gives any clues? Although it doesn’t mean an awful lot to me

Process: ZipCloud [53991]

Path: /Applications/ZipCloud.app/Contents/MacOS/ZipCloud

Identifier: org.pythonmac.unspecified.ZipCloud

Version: 2.2.2.1 (2.2.2.1)

Code Type: X86 (Native)

Parent Process: launchd [224]

Date/Time: 2012-04-13 11:55:06.148 +0100

OS Version: Mac OS X 10.6.8 (10K549)

Report Version: 6

Interval Since Last Report: 6117301 sec

Crashes Since Last Report: 656

Per-App Interval Since Last Report: 192052 sec

Per-App Crashes Since Last Report: 6

Anonymous UUID: 3CDA5183-C98C-490B-B747-693108BC2EF9

Exception Type: EXC_BAD_ACCESS (SIGBUS)

Exception Codes: KERN_PROTECTION_FAILURE at 0x0000000000000000

Crashed Thread: 0 Dispatch queue: com.apple.main-thread

Thread 0 Crashed: Dispatch queue: com.apple.main-thread

0 libwx_macud-2.8.0.dylib 0x0c46a713 macPostedEventCallback + 17

1 com.apple.CoreFoundation 0x90c3b42b __CFRunLoopDoSources0 + 1563

2 com.apple.CoreFoundation 0x90c38eef __CFRunLoopRun + 1071

3 com.apple.CoreFoundation 0x90c383c4 CFRunLoopRunSpecific + 452

4 com.apple.CoreFoundation 0x90c381f1 CFRunLoopRunInMode + 97

5 com.apple.Foundation 0x98834455 -[NSConcreteTask waitUntilExit] + 273

6 …honmac.unspecified.ZipCloud 0x00004aa8 start + 13256

7 …honmac.unspecified.ZipCloud 0x00006009 main + 1449

8 …honmac.unspecified.ZipCloud 0x000017e2 start + 258

9 …honmac.unspecified.ZipCloud 0x00001709 start + 41

Thread 1: Dispatch queue: com.apple.libdispatch-manager

0 libSystem.B.dylib 0x998c8382 kevent + 10

1 libSystem.B.dylib 0x998c8a9c _dispatch_mgr_invoke + 215

2 libSystem.B.dylib 0x998c7f59 _dispatch_queue_invoke + 163

3 libSystem.B.dylib 0x998c7cfe _dispatch_worker_thread2 + 240

4 libSystem.B.dylib 0x998c7781 _pthread_wqthread + 390

5 libSystem.B.dylib 0x998c75c6 start_wqthread + 30

Thread 2:

0 libSystem.B.dylib 0x998c7412 __workq_kernreturn + 10

1 libSystem.B.dylib 0x998c79a8 _pthread_wqthread + 941

2 libSystem.B.dylib 0x998c75c6 start_wqthread + 30

Thread 3:

0 libSystem.B.dylib 0x998c7412 __workq_kernreturn + 10

1 libSystem.B.dylib 0x998c79a8 _pthread_wqthread + 941

2 libSystem.B.dylib 0x998c75c6 start_wqthread + 30

Thread 0 crashed with X86 Thread State (32-bit):

eax: 0x00000000 ebx: 0x0c46a70b ecx: 0x001811bc edx: 0x0c46a702

edi: 0x001811bc esi: 0x001811b0 ebp: 0xbfffce48 esp: 0xbfffce44

ss: 0x0000001f efl: 0x00010202 eip: 0x0c46a713 cs: 0x00000017

ds: 0x0000001f es: 0x0000001f fs: 0x00000000 gs: 0x00000037

cr2: 0x00000000

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0x98291000 - 0x9829dff7 libkxld.dylib ??? (???) <9A441C48-2D18-E716-5F38-CBEAE6A0BB3E> /usr/lib/system/libkxld.dylib

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0x98370000 - 0x98374ff7 libGFXShared.dylib ??? (???) <09540618-2ED1-72C4-61CB-938B35927568> /System/Library/Frameworks/OpenGL.framework/Versions/A/Libraries/libGFXShared.dylib

0x983b3000 - 0x983b6ff7 libCoreVMClient.dylib ??? (???) <37F56237-4ABA-E5B5-968D-70FFE357E8E0> /System/Library/Frameworks/OpenGL.framework/Versions/A/Libraries/libCoreVMClient.dylib

0x983b7000 - 0x983beff7 com.apple.agl 3.0.12 (AGL-3.0.12) /System/Library/Frameworks/AGL.framework/Versions/A/AGL

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0x9875d000 - 0x9878eff7 libGLImage.dylib ??? (???) /System/Library/Frameworks/OpenGL.framework/Versions/A/Libraries/libGLImage.dylib

0x9878f000 - 0x98a00fef com.apple.Foundation 6.6.8 (751.63) <69B3441C-B196-F2AD-07F8-D8DD24E4CD8C> /System/Library/Frameworks/Foundation.framework/Versions/C/Foundation

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0x994de000 - 0x99502ff7 libJPEG.dylib ??? (???) <7EBC924F-B2EE-68B0-4EA0-F99EF54F0306> /System/Library/Frameworks/ApplicationServices.framework/Versions/A/Frameworks/ImageIO.framework/Versions/A/Resources/libJPEG.dylib

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0x99857000 - 0x998a0fe7 libTIFF.dylib ??? (???) <4A3EF156-D4FE-95E2-FA05-7BD76FF27CEC> /System/Library/Frameworks/ApplicationServices.framework/Versions/A/Frameworks/ImageIO.framework/Versions/A/Resources/libTIFF.dylib

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0x99dee000 - 0x99df2ff7 IOSurface ??? (???) <89D859B7-A26A-A5AB-8401-FC1E01AC7A60> /System/Library/Frameworks/IOSurface.framework/Versions/A/IOSurface

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0x9a914000 - 0x9aa16fe7 libcrypto.0.9.8.dylib 0.9.8 (compatibility 0.9.8) <015563C4-81E2-8C8A-82AC-31B38D904A42> /usr/lib/libcrypto.0.9.8.dylib

0x9aa4e000 - 0x9aa88ff7 libcups.2.dylib 2.8.0 (compatibility 2.0.0) <6875335E-0993-0D77-4E80-41763A8477CF> /usr/lib/libcups.2.dylib

0x9aa89000 - 0x9ab54fef com.apple.CoreServices.OSServices 359.2 (359.2) <7C16D9C8-6F41-5754-17F7-2659D9DD9579> /System/Library/Frameworks/CoreServices.framework/Versions/A/Frameworks/OSServices.framework/Versions/A/OSServices

0xffff0000 - 0xffff1fff libSystem.B.dylib ??? (???) <2DCD13E3-1BD1-6F25-119A-3863A3848B90> /usr/lib/libSystem.B.dylib

Model: MacPro4,1, BootROM MP41.0081.B07, 4 processors, Quad-Core Intel Xeon, 2.66 GHz, 6 GB, SMC 1.39f5

Graphics: NVIDIA GeForce GT 120, NVIDIA GeForce GT 120, PCIe, 512 MB

Memory Module: global_name

Bluetooth: Version 2.4.5f3, 2 service, 19 devices, 1 incoming serial ports

Network Service: Ethernet 1, Ethernet, en0

PCI Card: NVIDIA GeForce GT 120, sppci_displaycontroller, Slot-1

Serial ATA Device: HL-DT-ST DVD-RW GH41N

Serial ATA Device: WDC WD6400AAKS-41H2B0, 596.17 GB

USB Device: Keyboard Hub, 0x05ac (Apple Inc.), 0x1006, 0xfd300000 / 2

USB Device: U3 Cruzer Micro, 0x0781 (SanDisk Corporation), 0x5406, 0xfd310000 / 4

USB Device: Apple Keyboard, 0x05ac (Apple Inc.), 0x0221, 0xfd320000 / 3

USB Device: BRCM2046 Hub, 0x0a5c (Broadcom Corp.), 0x4500, 0x5a100000 / 2

USB Device: Bluetooth USB Host Controller, 0x05ac (Apple Inc.), 0x8215, 0x5a110000 / 5

FireWire Device: built-in_hub, Up to 800 Mb/sec

Robin · April 13, 2012, 5:56pm

    Take a look at the help files for wxStackWalker and
    wxApp::OnFatalException they may suggest a strategy to include some
    code that will at least let you release a version of the program
    that will provide some useful debug information to allow you to find
    the problem. Unfortunately most users do not give any indication of
    having read the error messages that are provided.

    Gadget/Steve

I've read that in order for wxApp::OnFatalException to be called I need
to turn on HandleFatalExceptions using this
<Application initialization and termination; but
I can't find that method/function anywhere?

I've googled it a bit and is it required to build wx with a certain flag
set to get this function?

It would require some changes to expose that to Python, and it probably wouldn't give you any more information than what you're already getting from the Apple crash report. IMO OnFatalException is really just intended to allow the app to be a little more user-friendly about its impending death, and perhaps to help the developer a little by having a good place to set a debugger breakpoint. However there isn't much that can be done in Python when the fault is happening in the C/C++ code.

I have the full error report if that gives any clues? Although it doesn't mean an awful lot to me

Thread 0 Crashed: Dispatch queue: com.apple.main-thread
0 libwx_macud-2.8.0.dylib 0x0c46a713 macPostedEventCallback + 17
1 com.apple.CoreFoundation 0x90c3b42b __CFRunLoopDoSources0 + 1563
2 com.apple.CoreFoundation 0x90c38eef __CFRunLoopRun + 1071
3 com.apple.CoreFoundation 0x90c383c4 CFRunLoopRunSpecific + 452
4 com.apple.CoreFoundation 0x90c381f1 CFRunLoopRunInMode + 97
5 com.apple.Foundation 0x98834455 -[NSConcreteTask waitUntilExit] + 273
6 ...honmac.unspecified.ZipCloud 0x00004aa8 start + 13256
7 ...honmac.unspecified.ZipCloud 0x00006009 main + 1449
8 ...honmac.unspecified.ZipCloud 0x000017e2 start + 258
9 ...honmac.unspecified.ZipCloud 0x00001709 start + 41

This indicates that the crash is happening in macPostedEventCallback, which looks like this:

void macPostedEventCallback(void *unused)
{
wxTheApp->ProcessPendingEvents();
}

So I would take a closer look at, and experiment with any code that is doing something funny with the application object, such as creating new instances (there should be only 1) using it after it may have been cleaned up, or etc. Also look at anywhere that you are doing wx.PostEvent or AddPendingEvent, and keep in mind that wx.CallAfter also makes use of pending events.

···

On 4/13/12 3:22 AM, Paul Wiseman wrote:

--
Robin Dunn
Software Craftsman

Paul6 · April 15, 2012, 1:49am

Take a look at the help files for wxStackWalker and
wxApp::OnFatalException they may suggest a strategy to include some

code that will at least let you release a version of the program

that will provide some useful debug information to allow you to find

the problem.  Unfortunately most users do not give any indication of

having read the error messages that are provided.



Gadget/Steve
I’ve read that in order for wxApp::OnFatalException to be called I need

to turn on HandleFatalExceptions using this

<http://docs.wxwidgets.org/2.8/wx_appinifunctions.html#wxhandlefatalexceptions> but

I can’t find that method/function anywhere?

I’ve googled it a bit and is it required to build wx with a certain flag

set to get this function?

It would require some changes to expose that to Python, and it probably wouldn’t give you any more information than what you’re already getting from the Apple crash report. IMO OnFatalException is really just intended to allow the app to be a little more user-friendly about its impending death, and perhaps to help the developer a little by having a good place to set a debugger breakpoint. However there isn’t much that can be done in Python when the fault is happening in the C/C++ code.

How can I enable it? It might be useful to be able to log out as much as possible to help find the cause of the problem

I have the full error report if that gives any clues? Although it doesn’t mean an awful lot to me

Thread 0 Crashed: Dispatch queue: com.apple.main-thread

0 libwx_macud-2.8.0.dylib 0x0c46a713 macPostedEventCallback + 17

1 com.apple.CoreFoundation 0x90c3b42b __CFRunLoopDoSources0 + 1563

2 com.apple.CoreFoundation 0x90c38eef __CFRunLoopRun + 1071

3 com.apple.CoreFoundation 0x90c383c4 CFRunLoopRunSpecific + 452

4 com.apple.CoreFoundation 0x90c381f1 CFRunLoopRunInMode + 97

5 com.apple.Foundation 0x98834455 -[NSConcreteTask waitUntilExit] + 273

6 …honmac.unspecified.ZipCloud 0x00004aa8 start + 13256

7 …honmac.unspecified.ZipCloud 0x00006009 main + 1449

8 …honmac.unspecified.ZipCloud 0x000017e2 start + 258

9 …honmac.unspecified.ZipCloud 0x00001709 start + 41

This indicates that the crash is happening in macPostedEventCallback, which looks like this:

void macPostedEventCallback(void *unused)

{
wxTheApp->ProcessPendingEvents();
}

So I would take a closer look at, and experiment with any code that is doing something funny with the application object, such as creating new instances (there should be only 1) using it after it may have been cleaned up, or etc. Also look at anywhere that you are doing wx.PostEvent or AddPendingEvent, and keep in mind that wx.CallAfter also makes use of pending events.

I found the cause of this one, although I know there is another cause of exc_bad_access that I’ve not seen the error report of yet that I still need to find.

This one was happening when importing AppKit and running after being built with py2app 0.6.4, but it works fine in 0.6.3- so nothing to do with wx

···

On 13 April 2012 18:56, Robin Dunn robin@alldunn.com wrote:

On 4/13/12 3:22 AM, Paul Wiseman wrote:

–

Robin Dunn

Software Craftsman

http://wxPython.org

–

To unsubscribe, send email to wxPython-users+unsubscribe@googlegroups.com

or visit http://groups.google.com/group/wxPython-users?hl=en

Paul6 · April 15, 2012, 1:29pm

I found the cause of this one, although I know there is another cause of exc_bad_access that I’ve not seen the error report of yet that I still need to find.

This one was happening when importing AppKit and running after being built with py2app 0.6.4, but it works fine in 0.6.3- so nothing to do with wx

Actually I was getting confused with another problem I was having, it wont build at all on 0.6.4 for reasons I’m not sure of yet, and I get the exc_bad_access when importing AppKit after building on 0.6.3