On Tue, May 08, 2018 at 09:56:01AM +0200, Dmitry Vyukov wrote: > On Wed, May 2, 2018 at 12:51 AM, Dave Chinner <da...@fromorbit.com> wrote: > >> >>> Hello, > >> >>> > >> >>> syzbot hit the following crash on upstream commit > >> >>> 86bbbebac1933e6e95e8234c4f7d220c5ddd38bc (Mon Apr 2 18:47:07 2018 > >> >>> +0000) > >> >>> Merge branch 'ras-core-for-linus' of > >> >>> git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip > >> >>> syzbot dashboard link: > >> >>> https://syzkaller.appspot.com/bug?extid=84a67953651a971809ba > >> >>> > >> >>> C reproducer: > >> >>> https://syzkaller.appspot.com/x/repro.c?id=5719304272084992 > >> >>> syzkaller reproducer: > >> >>> https://syzkaller.appspot.com/x/repro.syz?id=5767783983874048 > >> >> > >> >> What a mess. A hand built, hopelessly broken filesystem image made > >> >> up of hex dumps, written into a mmap()d region of memory, then > >> >> copied into a tmpfs file and mounted with the loop device. > >> >> > >> >> Engineers that can debug broken filesystems don't grow on trees. If > >> >> we are to have any hope of understanding what the hell this test is > >> >> doing, the bot needs to supply us with a copy of the built > >> >> filesystem image the test uses. We need to be able to point forensic > >> >> tools at the image to decode all the structures into human readable > >> >> format - if we are forced to do that by hand or jump through hoops > >> >> to create our own filesystem image than I'm certainly not going to > >> >> waste time looking at these reports... > >> > > >> > Hi Dave, > >> > > >> > Here is the image: > >> > https://drive.google.com/file/d/1jzhGGe5SBJcqfsjxCLHoh4Kazke1oTfC/view > >> > >> Have anybody looked at the bug and the image yet? > > > > Yes, I did that a couple of weeks ago. Couldn't reproduce on a TOT > > kernel here. > > Do you think it is fixed now? What fixed it? The bug was there.
We merge fixes for fuzzing issues all the time. IIRC a big batch of them from the xfstests fuzzing infrastructure went into 4.17-rc1. If you want a commit, then do a bisect.... Cheers, Dave. -- Dave Chinner da...@fromorbit.com
