malloc_error_break on exit

[randrews]

I've got a program that uses req / rep sockets that works totally fine with the iamaleskey version, and explodes with a malloc error on this version.

Here's the client:

require 'zmq'

ctx = zmq.init(1)
socket = ctx:socket(zmq.REQ)
socket:connect 'tcp://localhost:4568'
k = 0

while k < 10 do
   msg = string.format('ping %d', k)
   socket:send(msg)
   print(socket:recv())
   k = k + 1
   os.execute 'sleep 1'
end

socket:close()
ctx:term()

And the server:

require 'zmq'

ctx = zmq.init(1)
socket = ctx:socket(zmq.REP)
socket:bind 'tcp://*:4568'
n = 0

while true do
   s = socket:recv()
   print(string.format('Echoing %q', s))
   socket:send(s)
end

socket:close()
ctx:term()

I'm using zmq 2.1.7 on OS X Lion, Lua 5.1.4, and it fails with this:

lua(1373,0x7fff7d9e2960) malloc: *** error for object 0x1000bdc00: pointer being freed was not allocated
*** set a breakpoint in malloc_error_break to debug
Abort trap: 6

[Neopallium]

Which one crashes the client or the server? Also can you please provide a backtrace. I can not reproduce the crash on Linux and don't have a Mac to test on.

[randrews]

Sorry, should have said that. The client crashes, but it crashes on exit; it sends all the messages just fine. The only stack information I have is that error I pasted in.

[Neopallium]

Please run the client using gdb to get a backtrace: $ gdb lua (gdb) run client.lua

[randrews]

Not sure how useful this is, but here you go:

ping 1  nil
ping 2  nil
ping 3  nil
ping 4  nil
ping 5  nil
ping 6  nil
ping 7  nil
ping 8  nil
ping 9  nil
ping 10 nil
lua(9081,0x7fff7d9e2960) malloc: *** error for object 0x1000bdc00: pointer being freed was not allocated
*** set a breakpoint in malloc_error_break to debug

Program received signal SIGABRT, Aborted.
0x00007fff8f991ce2 in __pthread_kill ()

Not much of a stack trace, sorry. :)

[Neopallium]

Sorry I forgot you will need to use another gdb command to get the backtrace after the crash: $ gdb lua (gdb) run client.lua ------- wait for crash (gdb) thread apply all backtrace ------ that command will display backtrace for all running threads.

How are you compiling lua-zmq? Using LuaRocks or the CMake build?

Can you provide the build output from my lua-zmq and from iamaleskey's version. I think this might be a problem with compiler flags.

Maybe an easier way would be to replace iamaleskey's zmq.c file with src/pre_generated-zmq.nobj.c and use his makefile to build the .so file and see if it still crashes.

[Neopallium]

Looks like this is a common problem on OSX: http://lua-users.org/lists/lua-l/2009-10/msg00136.html

Did you recently recompile/reinstall Lua?

Also someone on that thread provided this link to pre-compiled Lua binaries: http://pdb.finkproject.org/pdb/package.php/lua51

With what I am reading online about this error it seems to be a problem with how Lua is compiled on OSX, or maybe lua-zmq is being linked to the wrong version of the Lua VM core (liblua.dylib file).

anyways I hope this info helps, let me know how it goes.

[Neopallium]

Looks like the Lua from MacPorts should also work, since they include some fixes to the lua Makefiles for this issue: http://www.macports.org/ports.php?by=name&substr=lua