On Tue, Sep 15, 2020 at 04:15:48PM +0800, Muchun Song wrote:

We should make sure that async workqueue is canceled on exit, but on
some corner case, we found that the async workqueue is not canceled
on exit in the linux-5.4. So we started an in-depth investigation.
Fortunately, we finally found the problem. The commit:

  1c4404efcf2c ("io_uring: make sure async workqueue is canceled on exit")

did not completely solve this problem. This patch series to solve this
problem completely. And there's no upstream variant of this commit, so
this patch series is just fix the linux-5.4.y stable branch.

Muchun Song (2):
  io_uring: Fix missing smp_mb() in io_cancel_async_work()
  io_uring: Fix remove irrelevant req from the task_list

Yinyin Zhu (1):
  io_uring: Fix resource leaking when kill the process

 fs/io_uring.c | 45 +++++++++++++++++++++++++++++----------------
 1 file changed, 29 insertions(+), 16 deletions(-)

-- 
2.11.0

<formletter>

This is not the correct way to submit patches for inclusion in the
stable kernel tree.  Please read:
    https://www.kernel.org/doc/html/latest/process/stable-kernel-rules.html
for how to do this properly.

</formletter>