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SubjectRe: kernel BUG at fs/pipe.c:LINE!
David,

On Sun, Dec 01, 2019 at 10:45:08PM -0800, syzbot wrote:
> Hello,
>
> syzbot found the following crash on:
>
> HEAD commit: b94ae8ad Merge tag 'seccomp-v5.5-rc1' of git://git.kernel...
> git tree: upstream
> console output: https://syzkaller.appspot.com/x/log.txt?x=1387ab12e00000
> kernel config: https://syzkaller.appspot.com/x/.config?x=ff560c3de405258c
> dashboard link: https://syzkaller.appspot.com/bug?extid=d37abaade33a934f16f2
> compiler: gcc (GCC) 9.0.0 20181231 (experimental)
> syz repro: https://syzkaller.appspot.com/x/repro.syz?x=12945c41e00000
> C reproducer: https://syzkaller.appspot.com/x/repro.c?x=161e202ee00000
>
> The bug was bisected to:
>
> commit 8cefc107ca54c8b06438b7dc9cc08bc0a11d5b98
> Author: David Howells <dhowells@redhat.com>
> Date: Fri Nov 15 13:30:32 2019 +0000
>
> pipe: Use head and tail pointers for the ring, not cursor and length
>
> bisection log: https://syzkaller.appspot.com/x/bisect.txt?x=118cce96e00000
> final crash: https://syzkaller.appspot.com/x/report.txt?x=138cce96e00000
> console output: https://syzkaller.appspot.com/x/log.txt?x=158cce96e00000
>
> IMPORTANT: if you fix the bug, please add the following tag to the commit:
> Reported-by: syzbot+d37abaade33a934f16f2@syzkaller.appspotmail.com
> Fixes: 8cefc107ca54 ("pipe: Use head and tail pointers for the ring, not
> cursor and length")
>
> ------------[ cut here ]------------
> kernel BUG at fs/pipe.c:582!

This same BUG_ON() crashed my system during normal use, no syzkaller involved at
all, on mainline 937d6eefc7. Can you please take a look? This syzbot report
has a reproducer so that might be the easiest place to start.

- Eric

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