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Date:   Tue, 06 Dec 2022 22:38:21 -0800
From:   John Fastabend <john.fastabend@gmail.com>
To:     syzbot <syzbot+04c21ed96d861dccc5cd@syzkaller.appspotmail.com>,
        bpf@vger.kernel.org, davem@davemloft.net, edumazet@google.com,
        jakub@cloudflare.com, john.fastabend@gmail.com, kuba@kernel.org,
        linux-kernel@vger.kernel.org, netdev@vger.kernel.org,
        pabeni@redhat.com, syzkaller-bugs@googlegroups.com
Message-ID: <639034dda7f92_bb36208f5@john.notmuch>
In-Reply-To: <00000000000073b14905ef2e7401@google.com>
References: <00000000000073b14905ef2e7401@google.com>
Subject: RE: [syzbot] BUG: stack guard page was hit in inet6_release
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syzbot wrote:
> Hello,
> 
> syzbot found the following issue on:
> 
> HEAD commit:    6a30d3e3491d selftests: net: Use "grep -E" instead of "egr..
> git tree:       net
> console+strace: https://syzkaller.appspot.com/x/log.txt?x=1576b11d880000
> kernel config:  https://syzkaller.appspot.com/x/.config?x=cc4b2e0a8e8a8366
> dashboard link: https://syzkaller.appspot.com/bug?extid=04c21ed96d861dccc5cd
> 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=14e1656b880000
> C reproducer:   https://syzkaller.appspot.com/x/repro.c?x=1077da23880000
> 
> Downloadable assets:
> disk image: https://storage.googleapis.com/syzbot-assets/bbee3d5fc908/disk-6a30d3e3.raw.xz
> vmlinux: https://storage.googleapis.com/syzbot-assets/bf9e258de70e/vmlinux-6a30d3e3.xz
> kernel image: https://storage.googleapis.com/syzbot-assets/afaa6696b9e0/bzImage-6a30d3e3.xz
> 
> IMPORTANT: if you fix the issue, please add the following tag to the commit:
> Reported-by: syzbot+04c21ed96d861dccc5cd@syzkaller.appspotmail.com
> 
> BUG: TASK stack guard page was hit at ffffc90003cd7fa8 (stack is ffffc90003cd8000..ffffc90003ce0000)
> stack guard page: 0000 [#1] PREEMPT SMP KASAN
> CPU: 0 PID: 3636 Comm: syz-executor238 Not tainted 6.1.0-rc7-syzkaller-00135-g6a30d3e3491d #0
> Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/26/2022
> RIP: 0010:mark_lock.part.0+0x26/0x1910 kernel/locking/lockdep.c:4593
> Code: 00 00 00 00 41 57 41 56 41 55 41 89 d5 48 ba 00 00 00 00 00 fc ff df 41 54 49 89 f4 55 53 48 81 ec 38 01 00 00 48 8d 5c 24 38 <48> 89 3c 24 48 c7 44 24 38 b3 8a b5 41 48 c1 eb 03 48 c7 44 24 40
> RSP: 0018:ffffc90003cd7fb8 EFLAGS: 00010096
> RAX: 0000000000000004 RBX: ffffc90003cd7ff0 RCX: ffffffff8162a7bf
> RDX: dffffc0000000000 RSI: ffff88801f65e238 RDI: ffff88801f65d7c0
> RBP: ffff88801f65e25a R08: 0000000000000000 R09: ffffffff910f4aff
> R10: fffffbfff221e95f R11: 0000000000000000 R12: ffff88801f65e238
> R13: 0000000000000002 R14: 0000000000000000 R15: 0000000000040000
> FS:  0000000000000000(0000) GS:ffff8880b9a00000(0000) knlGS:0000000000000000
> CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
> CR2: ffffc90003cd7fa8 CR3: 000000000c28e000 CR4: 00000000003506f0
> DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
> DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
> Call Trace:
>  <TASK>
>  mark_lock kernel/locking/lockdep.c:4598 [inline]
>  mark_usage kernel/locking/lockdep.c:4543 [inline]
>  __lock_acquire+0x847/0x56d0 kernel/locking/lockdep.c:5009
>  lock_acquire kernel/locking/lockdep.c:5668 [inline]
>  lock_acquire+0x1e3/0x630 kernel/locking/lockdep.c:5633
>  lock_sock_nested+0x3a/0xf0 net/core/sock.c:3447
>  lock_sock include/net/sock.h:1721 [inline]
>  sock_map_close+0x75/0x7b0 net/core/sock_map.c:1610

I'll take a look likely something recent.