Hi. I found a suspected deadlock bug from ext4.
ext4_fill_super() releases and re-takes BKL while s_umount is held.
Lock ordering at the point where BKL is re-taken is s_umount-> BKL.
However, at do_remount(), locking ordering is BKL->s_umount.
Therefore, concurrent execution of do_remount() and ext4_fill_super()
may result deadlock.
Please examine this report. Thank you.
p.s. I found this suspected bug by the motivation from
commit 5f22ca9b13551debea77a407a8d06cd9c6f15238.
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