What happens with busy inode->i_sb after sb is gone?

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Sorry for stupid question.

It is possible that we have busy inode that survives kill_super. One
possible scenario would be umount with MNT_DETACH.

In this case sb is gone and we have inode with i_sb pointing nowhere? What
happens then on any operation that tries to access sb, final iput in the
first case.

TIA

-andrey
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