reproducible bug in 2.2.19 & 2.4.x

From: Rainer Keller (
Date: Fri Sep 28 2001 - 06:38:52 EST

Hi Balazs,

Well, reading & running (on UP, no SIGSEGVs) Your code, I get the
impression, that there might be a small bug in it.

Your while-loop looks like this:
 while (1)
      int newfd;
      int tmplen;
      pthread_t t;
      tmplen = sizeof(sin);
      newfd = accept(fd, (struct sockaddr *) &sin, &tmplen);
      pthread_create(&t, NULL, thread_func, &newfd);

Now, if the thread_func is not started immediately on Your SMP-machine,
the next iteration of the loop might already have started the accept
with a new file-descriptor, leaving two threads reading on the same fd.

This should be per-thread data.

Just my 2 cents.


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