Re: [syzbot] [bpf?] WARNING: bad unlock balance in bpf

[Daniel Borkmann]

On 5/26/23 12:10 PM, syzbot wrote:
> Hello,
>
> syzbot found the following issue on:
>
> HEAD commit:    c4c84f6fb2c4 bpf: drop unnecessary bpf_capable() check in ..
> git tree:       bpf-next
> console+strace: https://syzkaller.appspot.com/x/log.txt?x=119576a9280000
> kernel config:  https://syzkaller.appspot.com/x/.config?x=8bc832f563d8bf38
> dashboard link: https://syzkaller.appspot.com/bug?extid=8982e75c2878b9ffeac5
> compiler:       gcc (Debian 10.2.1-6) 10.2.1 20210110, GNU ld (GNU Binutils for Debian) 2.35.2
> syz repro:      https://syzkaller.appspot.com/x/repro.syz?x=10391dde280000
> C reproducer:   https://syzkaller.appspot.com/x/repro.c?x=137da9c5280000
>
> Downloadable assets:
> disk image: https://storage.googleapis.com/syzbot-assets/3cb57feeb883/disk-c4c84f6f.raw.xz
> vmlinux: https://storage.googleapis.com/syzbot-assets/7ccb6d78c42d/vmlinux-c4c84f6f.xz
> kernel image: https://storage.googleapis.com/syzbot-assets/fb02c9cdb21c/bzImage-c4c84f6f.xz
>
> The issue was bisected to:
>
> commit c4c84f6fb2c4dc4c0f5fd927b3c3d3fd28b7030e
> Author: Andrii Nakryiko <andrii@xxxxxxxxxx>
> Date:   Wed May 24 22:54:19 2023 +0000
>
>      bpf: drop unnecessary bpf_capable() check in BPF_MAP_FREEZE command
[...]

Fyi, fixed this up today in bpf-next tree.

#syz fix: bpf: Fix bad unlock balance on freeze_mutex