Re: WARNING in generic_make_request_checks

[syzbot]

syzbot has bisected this bug to:

commit a32e236eb93e62a0f692e79b7c3c9636689559b9
Author: Linus Torvalds <torvalds@xxxxxxxxxxxxxxxxxxxx>
Date:   Fri Aug 3 19:22:09 2018 +0000

    Partially revert "block: fail op_is_write() requests to read-only  
partitions"

bisection log:  https://syzkaller.appspot.com/x/bisect.txt?x=119503d2e00000
start commit:   60f5a217 Merge tag 'usercopy-fix-v4.18-rc8' of git://git.k..
git tree:       upstream
final crash:    https://syzkaller.appspot.com/x/report.txt?x=139503d2e00000
console output: https://syzkaller.appspot.com/x/log.txt?x=159503d2e00000
kernel config:  https://syzkaller.appspot.com/x/.config?x=2dc0cd7c2eefb46f
dashboard link: https://syzkaller.appspot.com/bug?extid=21cfe1f803e0e158acf1
syz repro:      https://syzkaller.appspot.com/x/repro.syz?x=17b87bfc400000
C reproducer:   https://syzkaller.appspot.com/x/repro.c?x=117ccc8c400000

Reported-by: syzbot+21cfe1f803e0e158acf1@xxxxxxxxxxxxxxxxxxxxxxxxx
Fixes: a32e236eb93e ("Partially revert "block: fail op_is_write() requests  
to read-only partitions"")

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