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Subjectsys_umount() returns EBUSY when doing: sh -c "mount /dev/sdc1 /mnt; umount /mnt"

I've some shell scripts which try to find out the filesystem hosted by
a block device.

They basically do this:

mount /dev/sdc1 /mnt
fs=$(stat -f -c %T $mount_point)
umount /mnt

It happens to work but since an unknown upgrade (kernel, libs or tools
upgrade), umount(8) returns -EBUSY.

I found that it's actually the sys_umount() which return -EBUSY.

So the question, is this expected or is this a regression ?

If it's expected then which operation should I add between the
mount(8) and umount(8) to make the mount operation completely finish
(inside the kernel) so the next umount won't return -EBUSY ?

Oh I'm currently using the kernel shipped with F12:


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