[RFC 0/2] fix in-kernel segfault

[Pavel Begunkov <asml.silence@gmail.com>]

There is a bug hunging my system when run fixed-link with /dev/urandom
instead of /dev/zero (see patch 1/2).

As for me, the easiest way to fix is to grab mm and use userspace
address for this specific case (as it's done in patches). The other
way is to kmap/vmap, but the first should be short-lived and the
second needs mm anyway.

Ideas how to do it better way? Suggestions and corrections are welcome.

P.S. It seems for some reason it fails a bunch of unrelated tests,
that's POC and not meant to be applied yet.


Pavel Begunkov (2):
  io_uring: fix dead-hung for non-iter fixed rw
  io_uring: fix linked fixed !iter rw

 fs/io_uring.c | 95 ++++++++++++++++++++++++++++++++-------------------
 1 file changed, 60 insertions(+), 35 deletions(-)

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2.24.0