Hi, On 2020-07-16 23:12:41 +0300, Pavel Begunkov wrote: > On 16/07/2020 23:05, Andres Freund wrote: > > Hi, > > > > While testing the error handling of my uring using postgres branch I > > just encountered the situation that io_uring_setup() always fails with > > ENOMEN. > > > > It only does so for the user I did the testing on and not for other > > users. During the testing a few io_uring using processes were kill -9'd > > and a few core-dumped after abort(). No io_uring using processes are > > still alive. > > > > As the issue only happens to the one uid I suspect that > > current_user()->locked_mem got corrupted, perhaps after hitting the > > limit for real. > > Any chance it's using SQPOLL mode? No. It's a "plain" uring. The only thing that could be considered special is that one of the rings is shared between processes (which all run as the same user). Greetings, Andres Freund
