syzbot has bisected this issue to:

commit 7302e91f39a81a9c2efcf4bc5749d18128366945
Author: Marco Elver [off-list ref]
Date:   Fri Jan 14 22:03:58 2022 +0000

    mm/slab_common: use WARN() if cache still has objects on destroy

bisection log:  https://syzkaller.appspot.com/x/bisect.txt?x=142882ce080000
start commit:   cb71b93c2dc3 Add linux-next specific files for 20220628
git tree:       linux-next
final oops:     https://syzkaller.appspot.com/x/report.txt?x=162882ce080000
console output: https://syzkaller.appspot.com/x/log.txt?x=122882ce080000
kernel config:  https://syzkaller.appspot.com/x/.config?x=badbc1adb2d582eb
dashboard link: https://syzkaller.appspot.com/bug?extid=5e28cdb7ebd0f2389ca4
syz repro:      https://syzkaller.appspot.com/x/repro.syz?x=156f74ee080000

Reported-by: syzbot+5e28cdb7ebd0f2389ca4@syzkaller.appspotmail.com
Fixes: 7302e91f39a8 ("mm/slab_common: use WARN() if cache still has objects on destroy")

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