linux-4.19.y build error

[syzbot]

Hello,

syzbot found the following issue on:

HEAD commit: 47f65004 Linux 4.19.151
git tree: linux-4.19.y
console output: https://syzkaller.appspot.com/x/log.txt?x=1243909b900000
kernel config: https://syzkaller.appspot.com/x/.config?x=8661c24e239fd754
dashboard link: https://syzkaller.appspot.com/bug?extid=e0b013cdb4844b57a654
compiler: gcc (GCC) 10.1.0-syz 20200507

IMPORTANT: if you fix the issue, please add the following tag to the commit:
Reported-by: syzbot+e0b013...@syzkaller.appspotmail.com

certs/signing_key.pem: Permission denied

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[Dmitry Vyukov]

Was fixed by:
https://github.com/google/syzkaller/commit/fea47c014be7a00a32ab016b946c0a77f32c1f40

#syz invalid