I'm using zeromq in a long running windows service and experience
crash every few days.
Analyzing memory dump shows that the problem is in zeromq.
Service is simple publisher, and has few subscribers 2-5. Messages are
sent every second or so.
Messages are multipart, subject and body style.
.Net code is pretty simple:
_context = new Context(1);
_socket = _context.Socket(SocketType.PUB);
_socket.Bind(string.Format("tcp://{0}", _address));
....
_socket.SendMore(subject, Encoding.Unicode);
_socket.Send(message, Encoding.Unicode);
System:
Windows Server 2008
64 bit
zeromq-2.1.9
Analyzing memory dumps leads to the line:
wsa_assert (nbytes != SOCKET_ERROR);
in the
int zmq::tcp_socket_t::write (const void *data, int size)
function.
Value for the
WSAGetLastError ()
is:
WSAEFAULT ("Bad address")
00000000`03d5c320 "Assertion failed: Bad address (."
00000000`03d5c340 ".\..\..\src\tcp_socket.cpp:93)."
And is not one that is handled:
if (nbytes == -1 && (
WSAGetLastError () == WSAENETDOWN ||
WSAGetLastError () == WSAENETRESET ||
WSAGetLastError () == WSAEHOSTUNREACH ||
WSAGetLastError () == WSAECONNABORTED ||
WSAGetLastError () == WSAETIMEDOUT ||
WSAGetLastError () == WSAECONNRESET))
return -1;
wsa_assert (nbytes != SOCKET_ERROR);
so the wsa_assert get called, which aborts application.
Seams that zeromq tries to send data from address 0x00000000:
libzmq!zmq::tcp_socket_t::write(void * data = 0x00000000`00000000,
int size = 0n64261888)+0xdc [c:\work\zeromq-2.1.9\src\tcp_socket.cpp @
93]
Which is usually a bad decision.
When I limit number of subscribers to 2 I got less frequent crashes.
Upgrading to 2.1.10 didn't help.
Could you please help with this,
Igor.
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