memory corruption after "Fix race when checking i_size on direct i/oread"

[J. Bruce Fields]

I'm getting warnings about corruption of the kmalloc-32 slab on an nfs
server while running some regression tests.

A bisect lands on 9fe55eea7e4b444bafc42fa0000cc2d1d2847275 "Fix race
when checking i_size on direct i/o read".  Is there any known problem
here?

It doesn't reproduce immediately and it's possible I could have made a
mistake on the bisect.

I'll verify and try to narrow down the reproducer.

--b.
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