On Tue, Aug 3, 2021 at 11:34 AM Pavel Begunkov <asml.silence@xxxxxxxxx> wrote: > > On 8/3/21 8:47 AM, Sudip Mukherjee wrote: > > On Mon, Aug 2, 2021 at 12:55 PM Pavel Begunkov <asml.silence@xxxxxxxxx> wrote: > >> > >> On 8/1/21 9:28 PM, Sudip Mukherjee wrote: > >>> Hi Pavel, > >>> > >>> On Sun, Aug 1, 2021 at 9:52 AM Pavel Begunkov <asml.silence@xxxxxxxxx> wrote: > >>>> > >>>> On 8/1/21 1:10 AM, Pavel Begunkov wrote: > >>>>> On 7/31/21 7:21 PM, Sudip Mukherjee wrote: > >>>>>> Hi Jens, Pavel, > >>>>>> > >>>>>> We had been running syzkaller on v5.10.y and a "KASAN: > >>>>>> stack-out-of-bounds in iov_iter_revert" was being reported on it. I > >>>>>> got some time to check that today and have managed to get a syzkaller > >>>>>> reproducer. I dont have a C reproducer which I can share but I can use > >>>>>> the syz-reproducer to reproduce this with v5.14-rc3 and also with > >>>>>> next-20210730. > >>>>> > >>>>> Can you try out the diff below? Not a full-fledged fix, but need to > >>>>> check a hunch. > >>>>> > >>>>> If that's important, I was using this branch: > >>>>> git://git.kernel.dk/linux-block io_uring-5.14 > >>>> > >>>> Or better this one, just in case it ooopses on warnings. > >>> > >>> I tested this one on top of "git://git.kernel.dk/linux-block > >>> io_uring-5.14" and the issue was still seen, but after the BUG trace I > >>> got lots of "truncated wr" message. The trace is: > >> > >> That's interesting, thanks > >> Can you share the syz reproducer? > > > > Unfortunately I dont have a C reproducer, but this is the reproducer > > for syzkaller: > > Thanks. Maybe I'm not perfectly familiar with syz, but were there > any options? Like threaded, collide, etc.? Sorry, my mistake. I am still learning how syzkaller works. And I should have given the link to the report with my mail. https://elisa-builder-00.iol.unh.edu/syzkaller/report?id=959057ecd2886ff0c38cc53fa9c8eae46c1d7496 And also, I now have a C reproducer also, if that helps. -- Regards Sudip
