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From "Kevin Quick (JIRA)" <j...@apache.org>
Subject [jira] Created: (AMQCPP-327) SEGFAULT on shutdown with global variable AMQCPP references
Date Tue, 09 Nov 2010 17:28:01 GMT
SEGFAULT on shutdown with global variable AMQCPP references
-----------------------------------------------------------

                 Key: AMQCPP-327
                 URL: https://issues.apache.org/activemq/browse/AMQCPP-327
             Project: ActiveMQ C++ Client
          Issue Type: Bug
          Components: CMS Impl
    Affects Versions: 3.2.1
         Environment: CentOS
            Reporter: Kevin Quick
            Assignee: Timothy Bish
            Priority: Minor


If AMQ-CPP resources are managed by global variables and those global variables are not explicitly
shutdown, the post-exit shutdown code ordering usually causes a segfault.  This is because
the AMQ-CPP internal threads shutdown the apr library first and then the global variables
attempt to close() their connections which result in apr calls.

A simple program to demonstrate this is attached; when run it results in the segfault core
trace:

Program received signal SIGSEGV, Segmentation fault.
0xb72f72fe in mutex_hash (mem=0x806089c) at atomic/unix/mutex.c:78
78	atomic/unix/mutex.c: No such file or directory.
	in atomic/unix/mutex.c
(gdb) bt
#0  0xb72f72fe in mutex_hash (mem=0x806089c) at atomic/unix/mutex.c:78
#1  0xb72f7457 in apr_atomic_cas32 (mem=0x806089c, with=0, cmp=1) at atomic/unix/mutex.c:152
#2  0xb7e35bca in decaf::util::concurrent::atomic::AtomicBoolean::compareAndSet (
    this=0x8060898, expect=true, update=false)
    at decaf/util/concurrent/atomic/AtomicBoolean.cpp:42
#3  0xb7a51238 in activemq::core::ActiveMQConnection::stop (this=0x8060880)
    at activemq/core/ActiveMQConnection.cpp:425
#4  0xb7a56ad0 in activemq::core::ActiveMQConnection::close (this=0x8060880)
    at activemq/core/ActiveMQConnection.cpp:355
#5  0x08048adc in mgr::~mgr() ()
#6  0x08048b6b in std::auto_ptr<mgr>::~auto_ptr() ()
#7  0x08048974 in __tcf_1 ()
#8  0xb7346529 in exit () from /System/Links/Libraries/libc.so.6

Note: possibly related to AMQCPP-231.


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