OS: 64 bit ubuntu jaunty 9.04, latest version from SVN. 



socket-impl-gio.cc:
if (_abort_flag)
 {
   _listener->on_socket_abort (this);
 }
 else if (!(cond & (G_IO_IN | G_IO_OUT)))
 {
   _listener->on_socket_error (this);
 }
 else // G_IO_IN or G_IO_OUT
 {
   const DoResult result = (cond & G_IO_IN) ? do_read () : do_write ();
   /*  if (_abort_flag)        _listener->on_socket_abort (this);
   else*/ if (result == IO_ERR)   _listener->on_socket_error (this);
   else if (result == IO_READ)  set_watch_mode (READ_NOW);
   else if (result == IO_WRITE) set_watch_mode (WRITE_NOW);
 }

uncommenting line above leads to random segfaults on my machine.
in my opinion polling the status of "abort_flag" is done twice (unneeded).
commenting this out leads to no segfaults, perfectly working (at least the
hours i tried until today)

it seems that the second request for _abort_flag triggers the segfault.

output from gdb is this:
Program received signal SIGSEGV, Segmentation fault.
[Switching to Thread 0x7f61faa28790 (LWP 12446)]
0x000000000052431a in pan::GIOChannelSocket::gio_func (this=0x3281b60,
   channel=0x8e98340, cond=G_IO_IN) at socket-impl-gio.cc:502
502             if (_abort_flag)        _listener->on_socket_abort (this);