On 02/02/2021 17:41, Pavel Begunkov wrote: > On 02/02/2021 17:24, Jens Axboe wrote: >> On 2/2/21 10:10 AM, Victor Stewart wrote: >>>> Can you send the updated test app? >>> >>> https://gist.github.com/victorstewart/98814b65ed702c33480487c05b40eb56 >>> >>> same link i just updated the same gist >> >> And how are you running it? > > with SQPOLL with FIXED FLAG -> FAILURE: failed with error = ??? > -> io_uring_wait_cqe_timeout() strangely returns -1, (-EPERM??) Ok, _io_uring_get_cqe() is just screwed twice TL;DR we enter into it with submit=0, do an iteration, which decrements it, then a second iteration passes submit=-1, which is returned back by the kernel as a result and propagated back from liburing... -- Pavel Begunkov
