syzbot has bisected this issue to:
commit f9d6725bf44a5b9412b5da07e3467100fe2af236
Author: Alexander Lobakin <alobakin@xxxxx>
Date: Sat Feb 13 14:11:50 2021 +0000
skbuff: use __build_skb_around() in __alloc_skb()
bisection log: https://syzkaller.appspot.com/x/bisect.txt?x=11934b3ad00000
start commit: 81b1d39f Merge tag '5.12-rc4-smb3' of git://git.samba.org/..
git tree: upstream
final oops: https://syzkaller.appspot.com/x/report.txt?x=13934b3ad00000
console output: https://syzkaller.appspot.com/x/log.txt?x=15934b3ad00000
kernel config: https://syzkaller.appspot.com/x/.config?x=daeff30c2474a60f
dashboard link: https://syzkaller.appspot.com/bug?extid=0e905eb8228070c457a0
syz repro: https://syzkaller.appspot.com/x/repro.syz?x=10e0ed06d00000
C reproducer: https://syzkaller.appspot.com/x/repro.c?x=1144754ed00000
Reported-by: syzbot+0e905eb8228070c457a0@xxxxxxxxxxxxxxxxxxxxxxxxx
Fixes: f9d6725bf44a ("skbuff: use __build_skb_around() in __alloc_skb()")
For information about bisection process see: https://goo.gl/tpsmEJ#bisection
