Re: [Iaxclient-devel] SIGSEGV in libiax2 on FreeBSD

[Steve K. <st...@st...>]

On Sun, 2003-07-27 at 22:17, Scott Lambert wrote:

> I finally got some time to play with this some more.  I think I'm
> running into a problem that only shows up in GCC 3.x.  I think
> I remember seeing something about this type of problem on the
> FreeBSD-current list lately.  Unfortunately, I wasn't paying close
> enough attention.  I've been trawling the archives for a while now but
> still haven't found the answer.


Well, that's a pretty strange one.  I don't know how that line could
possibly cause a segfault!  That should probably just be a constant
assignment!

However, that line doesn't show up the same for me in my sources;
   2255 static struct iax_event *iax_net_read(void)
   2256 {
   2257         char buf[65536];
   2258         int res;
   2259         struct sockaddr_in sin;
   2260         int sinlen;
   2261         sinlen = sizeof(sin);
   2262         res = recvfrom(netfd, buf, sizeof(buf), 0, (struct
sockaddr *) &sin, &sinlen);
   2263         if (res < 0) {
   2264 #ifdef  WIN32
   2265                 if (WSAGetLastError() != WSAEWOULDBLOCK) {
   2266                         DEBU(G "Error on read: %d\n",
WSAGetLastError());
   2267                         IAXERROR "Read error on network socket:
%s", strerror(errno));
   2268                 }
   2269 #else
   2270                 if (errno != EAGAIN) {
   2271                         DEBU(G "Error on read: %s\n",
strerror(errno));
   2272                         IAXERROR "Read error on network socket:
%s", strerror(errno));
   2273                 }
   2274 #endif
   2275                 return NULL;
   2276         }
   2277         return iax_net_process(buf, res, &sin);
   2278 }

And the next line, calling recvfrom, probably shouldn't cause a segfault
either, because buf is on the stack, and we seem to be calling it
correctly.



-SteveK


> 
> Starting program: /home/lambert/src/vendor/iaxclient/simpleclient/wx/wx 
> libiax2/src/iax.c line 584 in iax_init: Started on port 4569
> 
> Program received signal SIGSEGV, Segmentation fault.
> iax_net_read () at libiax2/src/iax.c:2269
> 2269            sinlen = sizeof(sin);
> Current language:  auto; currently c
> (gdb) bt
> #0  iax_net_read () at libiax2/src/iax.c:2269
> #1  0x0805f6e0 in iax_get_event (blocking=0) at libiax2/src/iax.c:2418
> #2  0x0805b6ff in do_iax_event () at iaxclient_lib.c:682
> #3  0x0805b63f in iaxc_service_network (netfd=8) at iaxclient_lib.c:632
> #4  0x0805ab7c in iaxc_process_calls () at iaxclient_lib.c:297
> #5  0x0805abae in iaxc_processor (args=0x0) at iaxclient_lib.c:308
> #6  0x280a351e in _thread_start () from /usr/lib/libc_r.so.5

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