re-sending, as it never arrived....
----- Original Message -----
> From: "Mkrtchyan, Tigran" <tigran.mkrtchyan@xxxxxxx>
> To: "Linux NFS Mailing List" <linux-nfs@xxxxxxxxxxxxxxx>
> Sent: Monday, May 30, 2016 5:05:59 PM
> Subject: Infinit LAYOUTGET with mmap
> Dear NFS developers,
>
> On my test system I hit a behavior of the nfs client with
> kernel 4.4 which I haven't seen before.
>
>
> Here is a minimal example to reproduce the issue:
>
> ============= bug.c =====================
>
> #include <stdio.h>
> #include <stdlib.h>
> #include <unistd.h>
> #include <fcntl.h>
> #include <sys/mman.h>
>
>
> int main(int argc, char* argv[])
> {
>
> int *m;
> int fd;
> int err;
>
> fd = open(argv[1], O_CREAT| O_RDWR, O_TRUNC, 0666);
> if (fd < 0) {
> perror("failed to open file");
> exit(1);
> }
>
> err = ftruncate(fd, 4096);
> if (err) {
> perror("cant set filesize");
> exit(2);
> }
>
> m = mmap(NULL, 4096, PROT_READ | PROT_WRITE, MAP_SHARED, fd, 0);
> if (m == MAP_FAILED) {
> perror("failed to map the file");
> exit(2);
> }
>
> m[1] = 0;
>
> err = munmap(m, 4096);
> if (err) {
> perror("failed to unmap the file");
> }
>
> close(fd);
> }
> =============== end of example ================
>
>
>
> When running this code, client send an OPEN with share_access
> OPEN4_SHARE_ACCESS_BOTH. But later calient sends LAYOUTGET with IOMODE_READ
> followed by GETDEVICEINFO.
>
> This combination of LG+GDI remain for ever. The capture file is attached.
>
> My guess it that client expects RW layout.
>
> Kernel: 4.4.9-300.fc23.x86_64. I will try with upstream as well.
>
> Thanks a lot,
> Tigran.
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