Re: [syzbot] [mm] KASAN: null-ptr-deref Write in sys_io_uring_register

[syzbot <syzbot+092bbab7da235a02a03a@syzkaller.appspotmail.com>]

syzbot has bisected this issue to:

commit d2e88c71bdb07f1e5ccffbcc80d747ccd6144b75
Author: Tamir Duberstein <tamird@gmail.com>
Date:   Tue Nov 12 19:25:37 2024 +0000

    xarray: extract helper from __xa_{insert,cmpxchg}

bisection log:  https://syzkaller.appspot.com/x/bisect.txt?x=17435fc0580000
start commit:   c245a7a79602 Add linux-next specific files for 20241203
git tree:       linux-next
final oops:     https://syzkaller.appspot.com/x/report.txt?x=14c35fc0580000
console output: https://syzkaller.appspot.com/x/log.txt?x=10c35fc0580000
kernel config:  https://syzkaller.appspot.com/x/.config?x=af3fe1d01b9e7b7
dashboard link: https://syzkaller.appspot.com/bug?extid=092bbab7da235a02a03a
syz repro:      https://syzkaller.appspot.com/x/repro.syz?x=14a448df980000
C reproducer:   https://syzkaller.appspot.com/x/repro.c?x=15cca330580000

Reported-by: syzbot+092bbab7da235a02a03a@syzkaller.appspotmail.com
Fixes: d2e88c71bdb0 ("xarray: extract helper from __xa_{insert,cmpxchg}")

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