Re: [syzbot] WARNING in io_rsrc_node_switch

[syzbot]

syzbot has bisected this issue to:

commit eae071c9b4cefbcc3f985c5abf9a6e32c1608ca9
Author: Pavel Begunkov <asml.silence@xxxxxxxxx>
Date:   Sun Apr 25 13:32:24 2021 +0000

    io_uring: prepare fixed rw for dynanic buffers

bisection log:  https://syzkaller.appspot.com/x/bisect.txt?x=14498f59d00000
start commit:   d72cd4ad Merge tag 'scsi-misc' of git://git.kernel.org/pub..
git tree:       upstream
final oops:     https://syzkaller.appspot.com/x/report.txt?x=16498f59d00000
console output: https://syzkaller.appspot.com/x/log.txt?x=12498f59d00000
kernel config:  https://syzkaller.appspot.com/x/.config?x=65c207250bba4efe
dashboard link: https://syzkaller.appspot.com/bug?extid=a4715dd4b7c866136f79
syz repro:      https://syzkaller.appspot.com/x/repro.syz?x=11893de1d00000
C reproducer:   https://syzkaller.appspot.com/x/repro.c?x=161c19d5d00000

Reported-by: syzbot+a4715dd4b7c866136f79@xxxxxxxxxxxxxxxxxxxxxxxxx
Fixes: eae071c9b4ce ("io_uring: prepare fixed rw for dynanic buffers")

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