Re: [PATCH] io_uring: return back safer resurrect

[Lee Jones <lee.jones@linaro.org>]

On Wed, 16 Mar 2022, Greg KH wrote:

> On Wed, Mar 16, 2022 at 04:18:16PM +0000, Lee Jones wrote:
> > Stable Team,
> > 
> > > Revert of revert of "io_uring: wait potential ->release() on resurrect",
> > > which adds a helper for resurrect not racing completion reinit, as was
> > > removed because of a strange bug with no clear root or link to the
> > > patch.
> > > 
> > > Was improved, instead of rcu_synchronize(), just wait_for_completion()
> > > because we're at 0 refs and it will happen very shortly. Specifically
> > > use non-interruptible version to ignore all pending signals that may
> > > have ended prior interruptible wait.
> > > 
> > > This reverts commit cb5e1b81304e089ee3ca948db4d29f71902eb575.
> > > 
> > > Signed-off-by: Pavel Begunkov <asml.silence@gmail.com>
> > > ---
> > >  fs/io_uring.c | 18 ++++++++++++++----
> > >  1 file changed, 14 insertions(+), 4 deletions(-)
> > 
> > Please back-port this as far as it will apply.
> > 
> > Definitely through v5.10.y.
> > 
> > It solves a critical bug.
> > 
> > Subject: "io_uring: return back safer resurrect"
> > 
> > Upstream commit:: f70865db5ff35f5ed0c7e9ef63e7cca3d4947f04
> 
> It only applies to 5.10.y.  It showed up in 5.12, so if you want it
> further back than 5.10.y, can you provide a working backport?

Works for me, thanks.

-- 
Lee Jones [李琼斯]
Principal Technical Lead - Developer Services
Linaro.org │ Open source software for Arm SoCs
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