bug#64123: "stat -f -c '%T' ." on alpha fails with EOVERFLOW with NFS

[Pádraig Brady]

On 17/06/2023 20:53, matoro wrote:
> On 2023-06-17 15:23, Paul Eggert wrote:
> > On 2023-06-17 10:30, Pádraig Brady wrote:
> > > I see that s390 and alpha are the only 64 bit architectures
> > > that have a 32-bit ino_t for example, which may cause issues within
> > > glibc?
> >
> > Weird.
> >
> > What happens if you compile with -D_FILE_OFFSET_BITS=64? Does this
> > cause alpha to have a 64-bit ino_t? (How does that work, exactly?) If
> > so, then AC_SYS_LARGEFILE should check for this and should arrange for
> > "#define _FILE_OFFSET_BITS 64".
> >
> > Matoro, what happens if you compile the following C program?
> >
> >
> > #include <sys/stat.h>
> > #include <stdio.h>
> >
> > int
> > main (void)
> > {
> >    int n = sizeof (ino_t);
> >    printf ("%d\n", n);
> > }
> >
> >
> > Compile and run it like this:
> >
> > gcc ino.c
> > ./a.out
> > gcc -D_FILE_OFFSET_BITS=64 ino.c
> > ./a.out
> >
> > If the former prints "4" and the latter "8" then we can fix Autoconf
> > and Gnulib AC_SYS_LARGEFILE to do the right thing.
> >
> > Also, as Pádraig suggests, the output of the following shell command
> > would be useful:
> >
> > strace stat -f -c '%T' .
> >
> > Also please see
> > <https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1899582>.
> > Although it's about s390x I expect there are similar issues on alpha,
> > which may not be fixed and if so it's not a coreutils issue per se.
>
> This indeed seems to be the issue, thank you.  Compiling with
> -D_FILE_OFFSET_BITS=64 fixes the problem.
>
> For reference, here is the additional requested information.
>
> strace:  https://paste.matoro.tk/o1te2ek
> config.h:  https://paste.matoro.tk/93xerfg
>
> Thank you for your help!

In case it's useful, I noticed this thread from 2014 about ino_t
and consequences of using -D_FILE_OFFSET_BITS=64
https://sourceware.org/pipermail/libc-alpha/2014-March/thread.html#49675

cheers,
Pádraig