Attempted to read or write protected memory

Question

I ve started seeing an AccessViolationException being thrown in my application a several different spots   It never occured on my development pc  our test server  It also only manifested itself on 1 of our 2 production servers   Because it only seemed to happen on one of our production servers  I started looking at the installed  net framework versions on the servers   I found that  for some strange reason   the production server that was having problems had 2 0 sp2  3 0 sp2  and 3 5 sp1  while the other production server and the test server had 2 0 sp1  My app only targets the 2 0 framework  decided to uninstall all the framework versions from the production server and install only 2 0 sp1   So far I have not been able to reproduce the problem   Very interesting   Development pc  compact 2 0 sp2  compact 3 5  2 0 sp2  3 0 sp2  3 5 sp1 Test server  2 0 sp1 Production server1  2 0 sp1 Production server2  2 0 sp2  3 0 sp2  3 5 sp1  Now  why I can t reproduce the problem on my development pc which has 2 0 sp2 on it  I can t figure out   I heard rumors that this access violation may happen on some software that utilizes remoting  which mine does  but the access violation never happends when remoting is actually occuring   I m ok with using only 2 0 sp1 for now  but I m really interested to know if anyone has had this issue  and if they found a workaround for newer versions of the frameowork   Here s a couple of the exceptions and their stack traces   System AccessViolationException  Attempted to read or write protected memory  This is often an indication that other memory is corrupt     at ICSharpCode TextEditor TextArea HandleKeyPress Char ch     at ICSharpCode TextEditor TextArea SimulateKeyPress Char ch     at ICSharpCode TextEditor TextArea OnKeyPress KeyPressEventArgs e     at System Windows Forms Control ProcessKeyEventArgs Message amp  m     at System Windows Forms Control ProcessKeyMessage Message amp  m     at System Windows Forms Control WmKeyChar Message amp  m     at System Windows Forms Control WndProc Message amp  m     at System Windows Forms Control ControlNativeWindow OnMessage Message amp  m     at System Windows Forms Control ControlNativeWindow WndProc Message amp  m     at System Windows Forms NativeWindow Callback IntPtr hWnd  Int32 msg  IntPtr wparam  IntPtr lparam   System AccessViolationException  Attempted to read or write protected memory  This is often an indication that other memory is corrupt     at System Windows Forms UnsafeNativeMethods CallWindowProc IntPtr wndProc  IntPtr hWnd  Int32 msg  IntPtr wParam  IntPtr lParam     at System Windows Forms NativeWindow DefWndProc Message amp  m     at System Windows Forms Control DefWndProc Message amp  m     at System Windows Forms Control WndProc Message amp  m     at System Windows Forms TextBoxBase WndProc Message amp  m     at System Windows Forms RichTextBox WndProc Message amp  m     at System Windows Forms Control ControlNativeWindow OnMessage Message amp  m     at System Windows Forms Control ControlNativeWindow WndProc Message amp  m     at System Windows Forms NativeWindow Callback IntPtr hWnd  Int32 msg  IntPtr wparam  IntPtr lparam

User · Answer

Check to make sure you don t have threads within threads  That s what caused this error for me  See this link  Attempted to read or write protected memory  This is often an indication that other memory is corrupt

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For VS 2013   NET Framework 4 5 1 also has a AccessViolationException bug  KB2915689  when dealing with SQL Server   TCP Sockets  Upgrading to  NET Framework 4 5 2 corrects this problem  Reported VS NET AccessViolationException  Attempted to read or write protected memory  This is often an indication that other memory is corrupt

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In my case I had trouble with the  Environment variables  while adding reference to my COM DLL   When I added the reference to my project  I was looking for P  Core path  whereas I had added the c  core path in past into path environment varaible    So my code was attempting wrong path first  I removed that and un-registered the DLL reference and re-registered my DLL reference using  regsvr32   Hope this helps

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The problem may be due to mixed build platforms DLLs in the project  i e You build your project to Any CPU but have some DLLs in the project already built for x86 platform  These will cause random crashes because of different memory mapping of 32bit and 64bit architecture  If all the DLLs are built for one platform the problem can be solved  For safety try bulinding for 32bit x86 architecture because it is the most compatible

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I usually get  Attempted to read or write protected memory  when calling the  Show  method on some WinForms  I checked and there doesn t appear anything special about those forms  I don t know why this works  maybe someone can tell me  but usually moving the code that gets executed in the  Load  event of the form to the  Shown  event fixes it for me and I never see it again

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I had the same problem  2 0 worked fine  after installing up to 3 5 sp1  application gets Access Violation   installed http   support microsoft com kb 971030 and my problem is solved  even though I am not using LCG

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In my case this was fixed when I set up  Enable 32 Bit applications  True for Application pool in IIS server

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In some cases adding  Option Strict On  in VB NET and resolving all issues it finds by proper casting has solved this problem for me

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I was using OLEDB and I switched to SQL Client and it solved my problem with this error

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In my case fonts used in one of the shared library was not installed in the system

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I had the same problem after upgrading from  NET 4 5 to  NET 4 5 1  What fixed it for me was running this command   netsh winsock reset

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Hi There are two possible reasons    We have un-managed code and we are calling it from managed code  that is preventing to run this code  try running these commands and restart your pc  cmd  netsh winsock reset   open cmd exe and run command  netsh winsock reset catalog    Anti-virus is considering un-managed code as harmful and restricting to run this code disable anti-virus and then check

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Microsoft also released a hotfix  July 2nd  2007  to prevent the error  Attempted to read or write protected memory  that has been plaguing the  NET 2 0 platform for some time now   Look at http   support microsoft com kb 923028 - not sure if it applies to you  but thought you might like to check it out

[c#] Attempted to read or write protected memory

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