Re: [syzbot] general protection fault in btf_decl_tag_resolve

[syzbot]

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