WAPBL: unallocated file ?

[Nicolas Joly <njoly%pasteur.fr@localhost>]

Hi,

While still playing with my favourite testcase (native rename race
code, attached) on WAPBL, i noticed that i now get some bogus created
files when the program exits.

Here follow a sample session that illustrate it :

njoly@lanfeust [rump/native]> ls -al
total 52
drwxr-xr-x   2 njoly  users    512 Oct 23 18:40 .
drwxr-xr-x  11 njoly  users    512 Oct 23 18:43 ..
-rw-r--r--   1 njoly  users    442 Oct 23 17:19 Makefile
-rwxr-xr-x   1 njoly  users  18392 Oct 23 17:19 rename
-rw-r--r--   1 njoly  users    963 Oct 23 17:17 rename.c
njoly@lanfeust [rump/native]> ./rename
njoly@lanfeust [rump/native]> echo $?
0
njoly@lanfeust [rump/native]> ls -al
ls: rename2.test: Bad file descriptor
total 52
drwxr-xr-x   2 njoly  users    512 Oct 23 19:08 .
drwxr-xr-x  11 njoly  users    512 Oct 23 18:43 ..
-rw-r--r--   1 njoly  users    442 Oct 23 17:19 Makefile
-rwxr-xr-x   1 njoly  users  18392 Oct 23 17:19 rename
-rw-r--r--   1 njoly  users    963 Oct 23 17:17 rename.c

At that time, i cannot do anything with rename2.test; and clear it by
unmounting the file system and `fsck -f'.

root@lanfeust[~]# fsck -f /home
** /dev/rwd1a
** File system is already clean
** Last Mounted on /home
** Phase 1 - Check Blocks and Sizes
** Phase 2 - Check Pathnames
UNALLOCATED  I=18429320  OWNER=1000 MODE=0
SIZE=0 MTIME=Oct 23 19:08 2009 
NAME=/njoly/emul/netbsd/rump/native/rename2.test

REMOVE? yes

** Phase 3 - Check Connectivity
** Phase 4 - Check Reference Counts
** Phase 5 - Check Cyl groups
260244 files, 3029370 used, 100191349 free (24173 frags, 12520897 blocks, 0.0% 
fragmentation)

***** FILE SYSTEM WAS MODIFIED *****

Any idea ?
Thanks.

-- 
Nicolas Joly

Biological Software and Databanks.
Institut Pasteur, Paris.

#include <err.h>
#include <fcntl.h>
#include <pthread.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>

#define FILE1 "rename1.test"
#define FILE2 "rename2.test"


static int quit = 0;


static void *func1(void *arg) {
  int fd;

  while (quit != 1) {
    fd = open(FILE1, O_WRONLY|O_CREAT|O_TRUNC, 0666);
    unlink(FILE1);
    close(fd); }

  return NULL; }

static void *func2(void *arg) {

  while (quit != 1) {
    rename(FILE1, FILE2); }

  return NULL; }


int main() {
  int res;
  pthread_t th1, th2;

  res = pthread_create(&th1, NULL, func1, NULL);
  if (res != 0)
    errx(1, "pthread_create failed");
  res = pthread_create(&th2, NULL, func2, NULL);
  if (res != 0)
    errx(1, "pthread_create failed");

  sleep(10);
  quit = 1;

  res = pthread_join(th2, NULL);
  if (res != 0)
    errx(1, "pthread_join failed");
  res = pthread_join(th1, NULL);
  if (res != 0)
    errx(1, "pthread_join failed");

  return 0; }