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From "Helen Huang (Created) (JIRA)" <j...@apache.org>
Subject [jira] [Created] (AMQCPP-388) AprPool::getAprPool() returns NULL, causing access violation and application crash
Date Fri, 17 Feb 2012 21:34:57 GMT
AprPool::getAprPool() returns NULL, causing access violation and application crash
----------------------------------------------------------------------------------

                 Key: AMQCPP-388
                 URL: https://issues.apache.org/jira/browse/AMQCPP-388
             Project: ActiveMQ C++ Client
          Issue Type: Bug
          Components: Decaf
    Affects Versions: 3.2.3
         Environment: Windows xp service pack 3, ActiveMQ broker 5.3.1, apr 1.4.2, apr-util
1.3.9, apr iconv 1.2.1

            Reporter: Helen Huang
            Assignee: Timothy Bish
             Fix For: 3.2.3


Our application that uses activemq c++ client lib crashed with the following dump:

----------------------------------------------------------------------------------------------------------------------
Thread 87 - System ID 3780

Function     Arg 1     Arg 2     Arg 3   Source 
libapr_1!apr_pvsprintf+8     00000000     0642a188     180eeb94    
activemq_cppu!decaf::lang::Exception::buildMessage+71     0642a188     180eeb74     180eee2c
   
activemq_cppu!decaf::lang::exceptions::RuntimeException::RuntimeException+4d     180efeec
    0642a160     00000097    
activemq_cppu!decaf::lang::ThreadProperties::runCallback+125     180eee2c     180efee0   
 00000001    
msvcr80!CatchIt+5c     00000000     00000000     00000000

LIBAPR_1!APR_PVSPRINTF+8In scotapp.dmp the assembly instruction at libapr_1!apr_pvsprintf+8
in C:\scot\dll\libapr-1.dll has caused an access violation exception (0xC0000005) when trying
to read from memory location 0x0000002c on thread 87
--------------------------------------------------------------------------------------------------------------------

On the call stack, we saw that following function from class decaf::lang::Exception was called:
void Exception::buildMessage( const char* format, va_list& vargs ) {

    // Allocate buffer with a guess of it's size
    AprPool pool;

    // Allocate a buffer of the specified size.
    char* buffer = apr_pvsprintf( pool.getAprPool(), format, vargs );

    // Guessed size was enough. Assign the string.
    message.assign( buffer, strlen( buffer ) );
}

The first parameter passed into apr_pvsprintf was NULL, causing the crash. Could you please
take a look and see if there is any bug in the activemqcpp code that could cause the problem.
Thanks!

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