Re: KASAN: global-out-of-bounds Read in precalculate_color

syzbot has bisected this bug to:

commit 7594bf37ae9ffc434da425120c576909eb33b0bc
Author: Al Viro [off-list ref]
Date:   Mon Jul 17 02:53:08 2017 +0000

     9p: untangle ->poll() mess

bisection log:  https://syzkaller.appspot.com/x/bisect.txt?x=15e323a6e00000
start commit:   d7688697 Merge tag 'for-linus' of git://git.kernel.org/pub..
git tree:       upstream
console output: https://syzkaller.appspot.com/x/log.txt?x=13e323a6e00000
kernel config:  https://syzkaller.appspot.com/x/.config?x=121b4285bac421fe
dashboard link: https://syzkaller.appspot.com/bug?extid=02d9172bf4c43104cd70
syz repro:      https://syzkaller.appspot.com/x/repro.syz?x=119c517ae00000

Reported-by: syzbot+02d9172bf4c43104cd70@syzkaller.appspotmail.com
Fixes: 7594bf37ae9f ("9p: untangle ->poll() mess")

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