On Thu, Feb 20, 2020 at 11:39 AM Jens Axboe <axboe@xxxxxxxxx> wrote: > > On 2/20/20 9:34 AM, Glauber Costa wrote: > > On Thu, Feb 20, 2020 at 11:29 AM Jens Axboe <axboe@xxxxxxxxx> wrote: > >> > >> On 2/20/20 9:17 AM, Jens Axboe wrote: > >>> On 2/20/20 7:19 AM, Glauber Costa wrote: > >>>> Hi there, me again > >>>> > >>>> Kernel is at 043f0b67f2ab8d1af418056bc0cc6f0623d31347 > >>>> > >>>> This test is easier to explain: it essentially issues a connect and a > >>>> shutdown right away. > >>>> > >>>> It currently fails due to no fault of io_uring. But every now and then > >>>> it crashes (you may have to run more than once to get it to crash) > >>>> > >>>> Instructions are similar to my last test. > >>>> Except the test to build is now "tests/unit/connect_test" > >>>> Code is at git@xxxxxxxxxx:glommer/seastar.git branch io-uring-connect-crash > >>>> > >>>> Run it with ./build/release/tests/unit/connect_test -- -c1 > >>>> --reactor-backend=uring > >>>> > >>>> Backtrace attached > >>> > >>> Perfect thanks, I'll take a look! > >> > >> Haven't managed to crash it yet, but every run complains: > >> > >> got to shutdown of 10 with refcnt: 2 > >> Refs being all dropped, calling forget for 10 > >> terminate called after throwing an instance of 'fmt::v6::format_error' > >> what(): argument index out of range > >> unknown location(0): fatal error: in "unixdomain_server": signal: SIGABRT (application abort requested) > >> > >> Not sure if that's causing it not to fail here. > > > > Ok, that means it "passed". (I was in the process of figuring out > > where I got this wrong when I started seeing the crashes) > > Can you do, in your kernel dir: > > $ gdb vmlinux > [...] > (gdb) l *__io_queue_sqe+0x4a > > and see what it says? 0xffffffff81375ada is in __io_queue_sqe (fs/io_uring.c:4814). 4809 struct io_kiocb *linked_timeout; 4810 struct io_kiocb *nxt = NULL; 4811 int ret; 4812 4813 again: 4814 linked_timeout = io_prep_linked_timeout(req); 4815 4816 ret = io_issue_sqe(req, sqe, &nxt, true); 4817 4818 /* (I am not using timeouts, just async_cancel) > > -- > Jens Axboe >
