Re: general protection fault in vb2_mmap

[syzbot]

Bisection is inconclusive: the bug happens on the oldest tested release.

bisection log:  https://syzkaller.appspot.com/x/bisect.txt?x=160e9e6d200000
start commit:   [unknown
git tree:       upstream
final crash:    https://syzkaller.appspot.com/x/report.txt?x=150e9e6d200000
console output: https://syzkaller.appspot.com/x/log.txt?x=110e9e6d200000
dashboard link: https://syzkaller.appspot.com/bug?extid=52e5bf0ebfa66092937a
syz repro:      https://syzkaller.appspot.com/x/repro.syz?x=14c61b0b400000
C reproducer:   https://syzkaller.appspot.com/x/repro.c?x=109d545d400000

For information about bisection process see: https://goo.gl/tpsmEJ#bisection