On 8/15/20 7:38 PM, Drew DeVault wrote: > 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? Not really any work-arounds, and on earlier 5.7 (and 5.6 and older) the poll operation would have just failed with -EINVAL. -- Jens Axboe
