On 9/4/20 9:53 PM, Jens Axboe wrote: > On 9/4/20 9:22 PM, nick@xxxxxxxxxxxx wrote: >> Hi, >> >> I am helping out with the netty io_uring integration, and came across >> some strange behaviour which seems like it might be a bug related to >> async offload of read/write iovecs. >> >> Basically a WRITEV SQE seems to fail reliably with -BADADDRESS when the >> IOSQE_ASYNC flag is set but works fine otherwise (everything else the >> same). This is with 5.9.0-rc3. > > Do you see it just on 5.9-rc3, or also 5.8? Just curious... But that is > very odd in any case, ASYNC writev is even part of the regular tests. > Any sort of deferral, be it explicit via ASYNC or implicit through > needing to retry, saves all the needed details to retry without > needing any of the original context. > > Can you narrow down what exactly is being written - like file type, > buffered/O_DIRECT, etc. What file system, what device is hosting it. > The more details the better, will help me narrow down what is going on. Forgot, also size of the IO (both total, but also number of iovecs in that particular request. Essentially all the details that I would need to recreate what you're seeing. -- Jens Axboe
