On 8/15/20 12:45 AM, Pavel Begunkov wrote: > On 13/08/2020 02:32, Jens Axboe wrote: >> On 8/12/20 12:28 PM, Pavel Begunkov wrote: >>> On 12/08/2020 21:22, Pavel Begunkov wrote: >>>> On 12/08/2020 21:20, Pavel Begunkov wrote: >>>>> On 12/08/2020 21:05, Jens Axboe wrote: >>>>>> On 8/12/20 11:58 AM, Josef wrote: >>>>>>> Hi, >>>>>>> >>>>>>> I have a weird issue on kernel 5.8.0/5.8.1, SIGINT even SIGKILL >>>>>>> doesn't work to kill this process(always state D or D+), literally I >>>>>>> have to terminate my VM because even the kernel can't kill the process >>>>>>> and no issue on 5.7.12-201, however if IOSQE_IO_LINK is not set, it >>>>>>> works >>>>>>> >>>>>>> I've attached a file to reproduce it >>>>>>> or here >>>>>>> https://gist.github.com/1Jo1/15cb3c63439d0c08e3589cfa98418b2c >>>>>> >>>>>> Thanks, I'll take a look at this. It's stuck in uninterruptible >>>>>> state, which is why you can't kill it. >>>>> >>>>> It looks like one of the hangs I've been talking about a few days ago, >>>>> an accept is inflight but can't be found by cancel_files() because it's >>>>> in a link. >>>> >>>> BTW, I described it a month ago, there were more details. >>> >>> https://lore.kernel.org/io-uring/34eb5e5a-8d37-0cae-be6c-c6ac4d85b5d4@xxxxxxxxx >> >> Yeah I think you're right. How about something like the below? That'll >> potentially cancel more than just the one we're looking for, but seems >> kind of silly to only cancel from the file table holding request and to >> the end. > > The bug is not poll/t-out related, IIRC my test reproduces it with > read(pipe)->open(). See the previously sent link. Right, but in this context for poll, I just mean any request that has a poll handler armed. Not necessarily only a pure poll. The patch should fix your case, too. > As mentioned, I'm going to patch that up, if you won't beat me on that. Please test and send a fix if you find something! I'm going to ship what I have this weekend, but we can always add a fix on top if we need anything. -- Jens Axboe
