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syzbot has bisected this bug to:

commit 206aefde4f886fdeb3b6339aacab3a85fb74cb7e
Author: Jens Axboe <axboe@kernel.dk>
Date:   Fri Nov 8 01:27:42 2019 +0000

     io_uring: reduce/pack size of io_ring_ctx

bisection log:  https://syzkaller.appspot.com/x/bisect.txt?x=15f98af2e00000
start commit:   5d1131b4 Add linux-next specific files for 20191119
git tree:       linux-next
final crash:    https://syzkaller.appspot.com/x/report.txt?x=17f98af2e00000
console output: https://syzkaller.appspot.com/x/log.txt?x=13f98af2e00000
kernel config:  https://syzkaller.appspot.com/x/.config?x=b60c562d89e5a8df
dashboard link: https://syzkaller.appspot.com/bug?extid=0d818c0d39399188f393
syz repro:      https://syzkaller.appspot.com/x/repro.syz?x=169b29d2e00000
C reproducer:   https://syzkaller.appspot.com/x/repro.c?x=14b3956ae00000

Reported-by: syzbot+0d818c0d39399188f393@syzkaller.appspotmail.com
Fixes: 206aefde4f88 ("io_uring: reduce/pack size of io_ring_ctx")

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