[zeromq-dev] Assertion failed: !(msg_->flags () & msg_t::more)(session_base.cpp:157)

Rohan Bedarkar r_bedarkar at yahoo.com
Tue Sep 25 23:26:54 CEST 2012


Ok. Got the latest master and configured as you indicated... Ran gdb and here you go.. Here's the stack trace.... Does it help?


(gdb) run -f
Starting program: /home/rbe/zeromq/pub_sub_protobuf/pgm_sub -f
[Thread debugging using libthread_db enabled]
[New Thread 0xb7c4dba0 (LWP 25872)]
[New Thread 0xb744cba0 (LWP 25873)]
Assertion failed: !(msg_->flags () & msg_t::more) (session_base.cpp:157)


Program received signal SIGABRT, Aborted.
[Switching to Thread 0xb744cba0 (LWP 25873)]
0xffffe410 in __kernel_vsyscall ()


(gdb) whe
#0  0xffffe410 in __kernel_vsyscall ()
#1  0xb7ca18d0 in raise () from /lib/libc.so.6
#2  0xb7ca2ff3 in abort () from /lib/libc.so.6
#3  0xb7ef6ce7 in zmq::zmq_abort (errmsg_=0xb7f657f8 "!(msg_->flags () & msg_t::more)") at err.cpp:76
#4  0xb7f0eef4 in zmq::session_base_t::pull_msg (this=0x80fbde0, msg_=0xb744b64c) at session_base.cpp:157
#5  0xb7f0267a in zmq::pgm_receiver_t::drop_subscriptions (this=0x80fad08) at pgm_receiver.cpp:277
#6  0xb7f02a86 in zmq::pgm_receiver_t::plug (this=0x80fad08, io_thread_=0x80fd840, session_=0x80fbde0) at pgm_receiver.cpp:77
#7  0xb7f0e83c in zmq::session_base_t::process_attach (this=0x80fbde0, engine_=0x80fad10) at session_base.cpp:335
#8  0xb7eff165 in zmq::object_t::process_command (this=0x80fbde0, cmd_=@0xb744b75c) at object.cpp:86
#9  0xb7ef7b79 in zmq::io_thread_t::in_event (this=0x80fd840) at io_thread.cpp:75
#10 0xb7ef61f1 in zmq::epoll_t::loop (this=0x80fc878) at epoll.cpp:161
#11 0xb7ef62a1 in zmq::epoll_t::worker_routine (arg_=0x80fc878) at epoll.cpp:174
#12 0xb7f1d016 in thread_routine (arg_=0x80fc8bc) at thread.cpp:83
#13 0xb7c682ab in start_thread () from /lib/libpthread.so.0
#14 0xb7d38b9e in clone () from /lib/libc.so.6
(gdb) 



--

Rohan Bedarkar
MS, Computer Science 

University of Chicago
rohanb at cs.uchicago.edu


 




________________________________
 From: Ian Barber <ian.barber at gmail.com>
To: ZeroMQ development list <zeromq-dev at lists.zeromq.org> 
Sent: Tuesday, September 25, 2012 4:16 PM
Subject: Re: [zeromq-dev] Assertion failed: !(msg_->flags () & msg_t::more)(session_base.cpp:157)
 
On Mon, Sep 24, 2012 at 7:47 PM, RohanB <rohanb at cs.uchicago.edu> wrote:
>
>
> ahh.. I see what you mean. Here's the snippet.... Pretty straightforward...
>
> Same code works on 1 box and not the other..... Both boxes are enabled to
> receive data on that multicast address and there is no other publisher currently
> running.

Interesting. Could you update to the latest libzmq master, and build
with the debug flags (--with-debug when configuring the lib), and
would it be possible to set a break point on those lines and give us a
backtrace on the crashing machine, and take a look at the state of the
message? In gdb, that would be

gdb pgm_sub
break session_base.cpp:156
run all
<when it hits>
bt
print *msg_

Not at all sure why msg flags would be set. I haven't got a 32 bit
build of anything at the moment by the look of it, but I'll try and
find one at some point!

Ian
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