On Sat Aug 15, 2020 at 10:37 PM EDT, Jens Axboe wrote: > This should be fixed by this one: > > https://git.kernel.dk/cgit/linux-block/commit/?h=io_uring-5.9&id=d4e7cd36a90e38e0276d6ce0c20f5ccef17ec38c > > which will go into 5.7/5.8 stable shortly. Affected files are the ones > that use double waitqueues at the same time for polling, which are > mostly just tty... Thanks, I'll give this patch a try. I can trivially verify that it works correctly if stdin is not a TTY, I should have tried that myself. Do you know of any userspace workarounds for the problem that I could try on older kernels?