Date:	Thu, 1 Feb 2001 18:28:45 +0000 (GMT)
From:	Chris Evans <chris@scary.beasts.org>
To:	Malcolm Beattie <mbeattie@sable.ox.ac.uk>
Subject: Re: Serious reproducible 2.4.x kernel hang


[cc: davem because of the severity]

On Thu, 1 Feb 2001, Malcolm Beattie wrote:

> rid of the hang. So it looks as though some combination of
> shutdown(2) and SIGABRT is at fault. After the hang the kernel-side

Nope - I've nailed it to a _really_ simple test case. It looks like a
read() on a shutdown() unix dgram socket just kills the kernel. Demo code
below. I wonder if this affects UP or is SMP only?

Malcolm, does the below code reproduce the problem for you?

Cheers
Chris

#include <stdio.h>
#include <unistd.h>
#include <sys/types.h>
#include <sys/socket.h>

int
main(int argc, const char* argv[])
{
  int retval;
  int sockets[2];
  char buf[1];

  retval = socketpair(PF_UNIX, SOCK_DGRAM, 0, sockets);
  if (retval != 0)
  {
    perror("socketpair");
    exit(1);
  }
  shutdown(sockets[0], SHUT_RDWR);
  read(sockets[0], buf, 1);
}

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