Re: [syzbot] [mm?] kernel BUG in alloc_hugetlb_folio_reserve

[syzbot]

syzbot has bisected this issue to:

commit c6a3194c05e7e6fd0e8fbfb1720084ae2503c4ac
Author: Vivek Kasireddy <vivek.kasireddy@xxxxxxxxx>
Date:   Mon Jun 24 06:36:16 2024 +0000

    udmabuf: pin the pages using memfd_pin_folios() API

bisection log:  https://syzkaller.appspot.com/x/bisect.txt?x=12c71724580000
start commit:   69e858e0b8b2 Merge tag 'uml-for-linus-6.14-rc1' of git://g..
git tree:       upstream
final oops:     https://syzkaller.appspot.com/x/report.txt?x=11c71724580000
console output: https://syzkaller.appspot.com/x/log.txt?x=16c71724580000
kernel config:  https://syzkaller.appspot.com/x/.config?x=d033b14aeef39158
dashboard link: https://syzkaller.appspot.com/bug?extid=a504cb5bae4fe117ba94
syz repro:      https://syzkaller.appspot.com/x/repro.syz?x=1324fddf980000
C reproducer:   https://syzkaller.appspot.com/x/repro.c?x=128b55f8580000

Reported-by: syzbot+a504cb5bae4fe117ba94@xxxxxxxxxxxxxxxxxxxxxxxxx
Fixes: c6a3194c05e7 ("udmabuf: pin the pages using memfd_pin_folios() API")

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