On Wed, 25 Sep 2024 08:07:54 -0400 Sasha Levin wrote: > From: Sascha Hauer <s.hauer@xxxxxxxxxxxxxx> > > [ Upstream commit 54001d0f2fdbc7852136a00f3e6fc395a9547ae5 ] > > When asynchronous encryption is used KTLS sends out the final data at > proto->close time. This becomes problematic when the task calling > close() receives a signal. In this case it can happen that > tcp_sendmsg_locked() called at close time returns -ERESTARTSYS and the > final data is not sent. > > The described situation happens when KTLS is used in conjunction with > io_uring, as io_uring uses task_work_add() to add work to the current > userspace task. A discussion of the problem along with a reproducer can > be found in [1] and [2] > > Fix this by waiting for the asynchronous encryption to be completed on > the final message. With this there is no data left to be sent at close > time. I wouldn't backport this, it may cause perf regressions.
