Re: PIDFD_GET_INFO

[Helge Deller <deller@gmx.de>]

On 11/21/25 20:04, John David Anglin wrote:
> We have a new glibc failure that may be a kernel issue:
> 
> make[2]: Entering directory '/home/dave/gnu/glibc/glibc/misc'
> env GCONV_PATH=/home/dave/gnu/glibc/objdir/iconvdata LOCPATH=/home/dave/gnu/glibc/objdir/localedata LC_ALL=C
> /home/dave/gnu/glibc/objdir/elf/ld.so.1 --library-path
> /home/dave/gnu/glibc/objdir:/home/dave/gnu/glibc/objdir/math:/home/dave/gnu/glibc/objdir/elf:/home/dave/gnu/glibc/objdir/dlfcn:/home/dave/gnu/glibc/objdir/nss:/home/dave/gnu/glibc/objdir/nis:/home/dave/gnu/glibc/objdir/rt:/home/dave/gnu/glibc/objdir/resolv:/home/dave/gnu/glibc/objdir/mathvec:/home/dave/gnu/glibc/objdir/support:/home/dave/gnu/glibc/objdir/misc:/home/dave/gnu/glibc/objdir/debug:/home/dave/gnu/glibc/objdir/nptl:/usr/lib/gcc/hppa-linux-gnu/15/../../../hppa-linux-gnu/:/usr/lib/gcc/hppa-linux-gnu/15/../../../hppa-linux-gnu/
> /home/dave/gnu/glibc/objdir/misc/tst-pidfd_getinfo  > /home/dave/gnu/glibc/objdir/misc/tst-pidfd_getinfo.out; \
> ../scripts/evaluate-test.sh misc/tst-pidfd_getinfo $? false false > /home/dave/gnu/glibc/objdir/misc/tst-pidfd_getinfo.test-result
> make[2]: Leaving directory '/home/dave/gnu/glibc/glibc/misc'
> FAIL: misc/tst-pidfd_getinfo
> original exit status 1
> error: ../sysdeps/unix/sysv/linux/tst-pidfd_getinfo.c:52: ioctl (PIDFD_GET_INFO) failed: Invalid argument
> error: 1 test failures
> 
>    if (ioctl (pidfd, PIDFD_GET_INFO, &info) != 0)
>      {
>        if (errno == ENOTTY)
>          FAIL_UNSUPPORTED ("kernel does not support PIDFD_GET_INFO");
>        else
>          FAIL_EXIT1 ("ioctl (PIDFD_GET_INFO) failed: %m");
>      }
Which kernel are you running?

I could reproduce the issue with 6.12.33+deb13-parisc64, but
it's fixed in git head (6.18-rc1, in both compat-32bit and native mode).

There have been quite some changes in between those versions, so
maybe there is at least one patch missing backporting?

Helge