On Tue, Apr 12, 2011 at 04:01:50PM +0200, Gerhard Heift wrote:
> Hello,
>
> I have a linux kernel (2.6.38.2, armv5tel) running which exports a
> directory with following options:
Should be fixed in more recent stable kernel; let me know if not.
--b.
>
> /data ip/32(rw,async,crossmnt,insecure,root_squash,no_subtree_check,fsid=0)
>
> On the client (Debian unstable, kernel 2.6.38-2-amd64) I mounted the
> directory under /media(nfs4import with
>
> # mount -t nfs4 ip:/ /media/nfs4import
>
> After a lot running fdupes on this folder the server kernel starts
> throwing messages like this one:
>
> VFS: file-max limit [number] reached
>
> After a reboot I recognised that the number of used file descriptors
> increases during the run of fdupes (see /proc/sys/fs/file-nr). Even
> after unmounting the exported filesystem on the client, unexport the
> file system on the server and stopping the nfs-server the file
> descriptors are still allocated and unmounting the filesystem is not
> possible.
>
> After a little bit of research I could create a small program, which
> increases the used file descriptors by one.
>
> Regards,
> Gerhard
> #include <stdio.h>
>
> #define DIR "/media/nfs4import/"
>
> int main(void) {
> FILE *f1;
> FILE *f2;
> char b[1024];
> int i;
>
> // create file1
> f1 = fopen(DIR "file1.txt", "w");
> fwrite("test\n", 5, 1, f1);
> close(f1);
>
> // open file1 in read mode
> f1 = fopen(DIR "file1.txt", "r");
>
> for (i = 0; i < 1; i++) {
> // open file2 in write mode and close it
> f2 = fopen(DIR "file2.txt", "w");
> fclose(f2);
>
> // open file2 in read mode and close it
> // this causes the leak of a file descriptor on the server
> // just watch /proc/sys/fs/file-nr on the server
> f2 = fopen(DIR "file2.txt", "r");
> fclose(f2);
> }
> fclose(f1);
>
> return 0;
> }
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