NFS regression in 2.6

[Ulrich Drepper]

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This is a problem which pops up in the glibc test suite.  It's been like
this for many weeks, even months.  I just hadn't time to investigate.
But the problem is actually very easy.

Go into a directory mounted via NFS.  You need write access.  Then
execute this little program:

#include <errno.h>
#include <error.h>
#include <stdlib.h>
#include <unistd.h>
int
main (void)
{
  char tmp[] = "estale-test.XXXXXX";
  int fd = mkstemp (tmp);
  if (fd == -1)
    error (EXIT_FAILURE, errno, "mkstemp failed");
  if (unlink (tmp) != 0)
    error (EXIT_FAILURE, errno, "unlink '%s' failed", tmp);
  int fd2 = dup (fd);
  if (fd2 == -1)
    error (EXIT_FAILURE, errno, "dup failed");
  if (ftruncate (fd2, 0) != 0)
    error (EXIT_FAILURE, errno, "ftruncate failed");
  return 0;
}

The result is always, 100% of the time, a failure in ftruncate.  The
kernel reports ESTALE.  This has not been a problem in 2.4 and not even
in 2.6 until <mumble> months ago.  And of course it works with local disks.

- -- 
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Ulrich Drepper \    ,-----------------'   \ Mountain View, CA 94041 USA
Red Hat         `--' drepper at redhat.com `---------------------------
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