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SubjectRe: [PATCH] aio: fix mremap after fork null-deref
On Fri,  4 Nov 2022 17:25:19 -0400 Seth Jenkins <sethjenkins@google.com> wrote:

> Commit e4a0d3e720e7 ("aio: Make it possible to remap aio ring") introduced
> a null-deref if mremap is called on an old aio mapping after fork as
> mm->ioctx_table will be set to NULL.
>

Is this a theoretical thing, or has this oops actually been observed?

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