Dead lock & Access violation in libeay32.dll

Hi,

We are facing the below problem in libeay32.dll which causes CPU 100% and Access violation.

ntdll!KiFastSystemCallRet - Deadlock
ntdll!NtWaitForSingleObject+c    
kernel32!WaitForSingleObjectEx+a8    
kernel32!WaitForSingleObject+12    
mscorwks!ClrWaitForSingleObject+24    
mscorwks!RunWatson+1cb    
mscorwks!DoFaultReportWorker+9a2    
mscorwks!DoFaultReport+c3    
mscorwks!WatsonLastChance+30    
mscorwks!SaveIPFilter+190    
msvcr71!__CxxUnhandledExceptionFilter+46    
kernel32!UnhandledExceptionFilter+1c7    
kernel32!BaseThreadStart+4d    
kernel32!_except_handler3+61    
ntdll!ExecuteHandler2+26    
ntdll!ExecuteHandler+24    
ntdll!KiUserExceptionDispatcher+e     - Exception
libeay32!ASN1_STRING_set_default_mask_asc+f8    
libeay32!lh_doall_arg+21c

Following are the details of our application, we are using .Net application which calls the unmanaged Open SSL(0.9.8c) functions for SSL certification.

We request your support in letting know the possible reasons for the same.

Thanks