syzbot has bisected this issue to:
commit b5ea834dde6b6e7f75e51d5f66dac8cd7c97b5ef
Author: Yonghong Song <yhs@xxxxxx>
Date: Tue Sep 14 22:30:15 2021 +0000
bpf: Support for new btf kind BTF_KIND_TAG
bisection log: https://syzkaller.appspot.com/x/bisect.txt?x=12183484700000
start commit: b7892f7d5cb2 tools: Ignore errors from `which' when search..
git tree: bpf
final oops: https://syzkaller.appspot.com/x/report.txt?x=11183484700000
console output: https://syzkaller.appspot.com/x/log.txt?x=16183484700000
kernel config: https://syzkaller.appspot.com/x/.config?x=5044676c290190f2
dashboard link: https://syzkaller.appspot.com/bug?extid=53619be9444215e785ed
syz repro: https://syzkaller.appspot.com/x/repro.syz?x=16454914700000
C reproducer: https://syzkaller.appspot.com/x/repro.c?x=16ceb884700000
Reported-by: syzbot+53619be9444215e785ed@xxxxxxxxxxxxxxxxxxxxxxxxx
Fixes: b5ea834dde6b ("bpf: Support for new btf kind BTF_KIND_TAG")
For information about bisection process see: https://goo.gl/tpsmEJ#bisection
