[Libevent-users] libevent 2.0.4: Segmentation fault with BEV_OPT_THREADSAFE set

[Jarod Liu <liuyuanzhi@xxxxxxxxx>]

My demo code works fine without the BEV_OPT_THREADSAFE option.
With the option segmentation fault  100% will happen.

Maybe it is a platform specified problem, I see no one report before.

=====================================================================
$ /usr/bin/c++ --version
c++ (GCC) 4.1.2 20080704 (Red Hat 4.1.2-46)

$ lsb_release -a
LSB Version:
:core-3.1-ia32:core-3.1-noarch:graphics-3.1-ia32:graphics-3.1-noarch
Distributor ID: CentOS
Description:    CentOS release 5.4 (Final)
Release:        5.4
Codename:       Final

=====================================================================
*** Aborted at 1270200692 (unix time) try "date -d @1270200692" if you
are using GNU date ***
PC: @   0x17637a _bufferevent_incref_and_lock
*** SIGSEGV (@0x100) received by PID 32210 (TID 0xb7f8e6d0) from PID
256; stack trace: ***
    @   0x499440 (unknown)
    @   0x176d5c bufferevent_enable
    @  0x804901e accept_conn_cb()
    @   0x179d23 listener_read_cb
    @   0x16e5a9 event_base_loop
    @   0x16f1a5 event_base_dispatch
    @  0x8048f4d main
    @   0xa99e9c (unknown)
    @  0x8048b21 (unknown)
Segmentation fault

=====================================================================
#include <cstring>
#include <event2/util.h>
#include <event2/event.h>
#include <event2/bufferevent.h>
#include <event2/listener.h>

static void accept_conn_cb(struct evconnlistener* listener,
    evutil_socket_t sockfd, struct sockaddr* addr, int socklen,
    void *user_data) {

  struct event_base *base = evconnlistener_get_base(listener);
  struct bufferevent *bev = bufferevent_socket_new(
                        base,  sockfd,  BEV_OPT_CLOSE_ON_FREE |
BEV_OPT_THREADSAFE);
  bufferevent_enable(bev,  EV_READ | EV_WRITE);

  for (char i='a'; i<'z'; i++) {
    bufferevent_write(bev, &i, sizeof(i));
  }
}

int main(int argc, char** argv) {
  struct event_base *base;
  struct sockaddr_in sin;
  struct evconnlistener *listener;

  base = event_base_new();

  memset(&sin,  0,  sizeof(sin));
  sin.sin_family = AF_INET;
  sin.sin_addr.s_addr = htonl(0);
  sin.sin_port = htons(9050);

  listener = evconnlistener_new_bind(base,  accept_conn_cb,  NULL,
                    LEV_OPT_CLOSE_ON_FREE|LEV_OPT_REUSEABLE,  SOMAXCONN,
                                        (struct sockaddr*)&sin,  sizeof(sin));
  event_base_dispatch(base);
  return 0;
}       // ----------  end of function main  ----------
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