Comment 4 for bug 1704658

I see this bug for hppa, sparc64.
I don't see it for m68k, mips, mips64, powerpc, powerpc64.
Most likely because the binary values of O_CLOEXEC on hppa and sparc64 are different than on other platforms. Looking in the glibc source code:

$ grep -r 'define.*O_CLOEXEC' glibc
glibc/bits/fcntl.h:# define O_CLOEXEC 0x00400000 /* Set close_on_exec. */
glibc/sysdeps/mach/hurd/bits/fcntl.h:# define O_CLOEXEC 0x00400000 /* Set FD_CLOEXEC. */
glibc/sysdeps/unix/sysv/linux/sparc/bits/fcntl.h:#define __O_CLOEXEC 0x400000 /* Set close_on_exit. */
glibc/sysdeps/unix/sysv/linux/bits/fcntl-linux.h:# define __O_CLOEXEC 02000000
glibc/sysdeps/unix/sysv/linux/bits/fcntl-linux.h:# define O_CLOEXEC __O_CLOEXEC /* Set close_on_exec. */
glibc/sysdeps/unix/sysv/linux/hppa/bits/fcntl.h:#define __O_CLOEXEC 010000000 /* Set close_on_exec. */
glibc/sysdeps/unix/sysv/linux/microblaze/bits/fcntl.h:#define __O_CLOEXEC 02000000 /* Set close_on_exec. */
glibc/sysdeps/unix/sysv/linux/alpha/bits/fcntl.h:#define __O_CLOEXEC 010000000 /* Set close_on_exec. */
glibc/sysdeps/nacl/bits/fcntl.h:# define O_CLOEXEC 02000000 /* Set close_on_exec. */

So, what's missing is probably that the O_CLOEXEC of the target platform gets mapped to O_CLOEXEC of the host platform, during the dup3 system call emulation.