From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from mail-il1-f208.google.com (mail-il1-f208.google.com [209.85.166.208]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 415BC1D516A for ; Tue, 4 Feb 2025 05:52:28 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=209.85.166.208 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1738648350; cv=none; b=UsKXGUMSG1myVqlhTbdbKdeyCXaEiY7kS6TwIgzm/JhR2ViyFgrXMh4s7d6iix91ZY2AfhALzqWR9SuGZ50GymkkAyWRj6YNQLX/Gf1SkxzV36aHXfTEUfEQGvtKdAlgn9HbKkZ6romBTj4zuJ2UNg57Xn7h/MmHBhBE0U3ZC1g= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1738648350; c=relaxed/simple; bh=ZeonDoqXKJqphllXajH1EiFCLCqfnqQeRcLyohUevyE=; h=MIME-Version:Date:Message-ID:Subject:From:To:Content-Type; b=t3d/vPbg1YHyZnida5W/Ag0v3XOvrKjDGRR78PyLKn5Veb30m53O5ZdUAZ7ESFvZDTYovlw8KO+AD7ayRd3oQjNknXHrYG0LtJGsrhKv9LxgvF98GSvGNwp3NvXUYnlzVKTlzwbdDErCtAON3XeuiiT+9udsPZbepXL54Tvu/GU= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dmarc=fail (p=none dis=none) header.from=syzkaller.appspotmail.com; spf=pass smtp.mailfrom=M3KW2WVRGUFZ5GODRSRYTGD7.apphosting.bounces.google.com; arc=none smtp.client-ip=209.85.166.208 Authentication-Results: smtp.subspace.kernel.org; dmarc=fail (p=none dis=none) header.from=syzkaller.appspotmail.com Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=M3KW2WVRGUFZ5GODRSRYTGD7.apphosting.bounces.google.com Received: by mail-il1-f208.google.com with SMTP id e9e14a558f8ab-3d00f199b76so89645675ab.2 for ; Mon, 03 Feb 2025 21:52:27 -0800 (PST) X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20230601; t=1738648347; x=1739253147; h=to:from:subject:message-id:date:mime-version:x-gm-message-state :from:to:cc:subject:date:message-id:reply-to; bh=2qazin/m+8r16/vlOKljfbgqTQeNxib9QnEDTDSqHes=; b=ALVIj8Bta/0IlDj2NrGTbiJG3AUeMUETvA/DwBrrK+AUSeDA+m8ElcvP/FkSFq2+Na ah3PrPBhU26H002+jiFJIksi7kTGERpH7WRjiwflaEZ5IZAIrdASXLMgajH0GasqqRt7 E52oXUHapTBLBMsCBlzCD63YLgvoP7eFXXuXp9RIgCtef93/5929ru/+W48B5KAkdbTZ DkC72Y3s8b37xVmIjOZGxFmxP3YLPDbG1gmYCUpKpiUN7js/n7GJqVy86YALtsSDWZjw HbCa+zo4PibpDa5Ya78FrA2GH19j+GcnVnF9lzcVcMXKjnoQ0rFrvYhIsBRMYU7VBX3x Ubdg== X-Forwarded-Encrypted: i=1; AJvYcCXzTL12Y1F3Rp+nh789QCAkbanrCIfD7kkUJWxXxUbKZYpqjMV9ql3u6+W3GS6QDX7RQegfF9/k2uSQ8hM=@vger.kernel.org X-Gm-Message-State: AOJu0YwERqJxr5Q++DxlzfKucCzSEwW9v47M1W42G3w3onJqUNRrJDVk Hs+RjVj9NSOjrKSzJqC1HskMeJwxQQH+Ul/AdW08eK3dbKtF513he3+n9MrbWfs1D42luMVL+xi JE6+dXvyTew4jb95rzhWpb+y7AnxBlOCufqCW3MC+rz4JbF/FvBNEV64= X-Google-Smtp-Source: AGHT+IFj9akyhlt1T+vPRqQ6b6TbwB5q1YWI8aVzg30MmGTJk8HtdCDdF74H4g9kK2Nr6blvc+VX5Mas3yF4wdNQ4GENR73PIBpq Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 X-Received: by 2002:a05:6e02:1ca2:b0:3d0:164e:958 with SMTP id e9e14a558f8ab-3d0164e0b22mr143078025ab.17.1738648347379; Mon, 03 Feb 2025 21:52:27 -0800 (PST) Date: Mon, 03 Feb 2025 21:52:27 -0800 X-Google-Appengine-App-Id: s~syzkaller X-Google-Appengine-App-Id-Alias: syzkaller Message-ID: <67a1ab1b.050a0220.163cdc.0061.GAE@google.com> Subject: [syzbot] [net?] general protection fault in __fib6_drop_pcpu_from (6) From: syzbot To: davem@davemloft.net, dsahern@kernel.org, edumazet@google.com, horms@kernel.org, kuba@kernel.org, linux-kernel@vger.kernel.org, netdev@vger.kernel.org, pabeni@redhat.com, syzkaller-bugs@googlegroups.com Content-Type: text/plain; charset="UTF-8" Hello, syzbot found the following issue on: HEAD commit: 21266b8df522 Merge tag 'AT_EXECVE_CHECK-v6.14-rc1' of git:.. git tree: upstream console output: https://syzkaller.appspot.com/x/log.txt?x=145d5ab0580000 kernel config: https://syzkaller.appspot.com/x/.config?x=35d426d11e96abde dashboard link: https://syzkaller.appspot.com/bug?extid=1e7754bbf472315fa1e2 compiler: Debian clang version 15.0.6, GNU ld (GNU Binutils for Debian) 2.40 Unfortunately, I don't have any reproducer for this issue yet. Downloadable assets: disk image: https://storage.googleapis.com/syzbot-assets/1ae7dbe9a3c4/disk-21266b8d.raw.xz vmlinux: https://storage.googleapis.com/syzbot-assets/df012528770e/vmlinux-21266b8d.xz kernel image: https://storage.googleapis.com/syzbot-assets/b59f340ba623/bzImage-21266b8d.xz IMPORTANT: if you fix the issue, please add the following tag to the commit: Reported-by: syzbot+1e7754bbf472315fa1e2@syzkaller.appspotmail.com Oops: general protection fault, probably for non-canonical address 0xdffffc0000000013: 0000 [#1] PREEMPT SMP KASAN PTI KASAN: null-ptr-deref in range [0x0000000000000098-0x000000000000009f] CPU: 0 UID: 0 PID: 52 Comm: kworker/u8:3 Not tainted 6.13.0-syzkaller-04858-g21266b8df522 #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 12/27/2024 Workqueue: netns cleanup_net RIP: 0010:__fib6_drop_pcpu_from+0x1fd/0x3d0 net/ipv6/ip6_fib.c:980 Code: 48 c1 e8 03 42 80 3c 20 00 74 08 48 89 ef e8 ba 1d 93 f7 48 8b 6d 00 48 85 ed 74 30 48 81 c5 90 00 00 00 48 89 e8 48 c1 e8 03 <42> 80 3c 20 00 74 08 48 89 ef e8 94 1d 93 f7 48 8b 45 00 4c 39 f0 RSP: 0018:ffffc90000bc6c00 EFLAGS: 00010202 RAX: 0000000000000013 RBX: ffffffff8e2fbb50 RCX: ffff888021ac8000 RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000000 RBP: 0000000000000098 R08: ffffffff8a704438 R09: 1ffffffff20345d6 R10: dffffc0000000000 R11: fffffbfff20345d7 R12: dffffc0000000000 R13: ffff8880248a8510 R14: ffff8880248a8400 R15: 0000000000000000 FS: 0000000000000000(0000) GS:ffff8880b8600000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 000000110c335fd7 CR3: 00000000118ae000 CR4: 00000000003526f0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: fib6_drop_pcpu_from net/ipv6/ip6_fib.c:1024 [inline] fib6_purge_rt+0x193/0x890 net/ipv6/ip6_fib.c:1035 fib6_del_route net/ipv6/ip6_fib.c:1995 [inline] fib6_del+0xe71/0x1600 net/ipv6/ip6_fib.c:2040 fib6_clean_node+0x2f7/0x5e0 net/ipv6/ip6_fib.c:2202 fib6_walk_continue+0x658/0x8f0 net/ipv6/ip6_fib.c:2124 fib6_walk+0x168/0x2b0 net/ipv6/ip6_fib.c:2172 fib6_clean_tree net/ipv6/ip6_fib.c:2252 [inline] __fib6_clean_all+0x31f/0x4b0 net/ipv6/ip6_fib.c:2268 rt6_sync_down_dev net/ipv6/route.c:4908 [inline] rt6_disable_ip+0x170/0x800 net/ipv6/route.c:4913 addrconf_ifdown+0x15d/0x1bd0 net/ipv6/addrconf.c:3849 addrconf_notify+0x3cb/0x1020 notifier_call_chain+0x1a5/0x3f0 kernel/notifier.c:85 call_netdevice_notifiers_extack net/core/dev.c:2179 [inline] call_netdevice_notifiers net/core/dev.c:2193 [inline] dev_close_many+0x33c/0x4c0 net/core/dev.c:1717 unregister_netdevice_many_notify+0x52b/0x2030 net/core/dev.c:11779 unregister_netdevice_many net/core/dev.c:11875 [inline] default_device_exit_batch+0xa1f/0xaa0 net/core/dev.c:12360 ops_exit_list net/core/net_namespace.c:177 [inline] cleanup_net+0x8ad/0xd60 net/core/net_namespace.c:652 process_one_work kernel/workqueue.c:3236 [inline] process_scheduled_works+0xa66/0x1840 kernel/workqueue.c:3317 worker_thread+0x870/0xd30 kernel/workqueue.c:3398 kthread+0x7a9/0x920 kernel/kthread.c:464 ret_from_fork+0x4b/0x80 arch/x86/kernel/process.c:148 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:244 Modules linked in: ---[ end trace 0000000000000000 ]--- RIP: 0010:__fib6_drop_pcpu_from+0x1fd/0x3d0 net/ipv6/ip6_fib.c:980 Code: 48 c1 e8 03 42 80 3c 20 00 74 08 48 89 ef e8 ba 1d 93 f7 48 8b 6d 00 48 85 ed 74 30 48 81 c5 90 00 00 00 48 89 e8 48 c1 e8 03 <42> 80 3c 20 00 74 08 48 89 ef e8 94 1d 93 f7 48 8b 45 00 4c 39 f0 RSP: 0018:ffffc90000bc6c00 EFLAGS: 00010202 RAX: 0000000000000013 RBX: ffffffff8e2fbb50 RCX: ffff888021ac8000 RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000000 RBP: 0000000000000098 R08: ffffffff8a704438 R09: 1ffffffff20345d6 R10: dffffc0000000000 R11: fffffbfff20345d7 R12: dffffc0000000000 R13: ffff8880248a8510 R14: ffff8880248a8400 R15: 0000000000000000 FS: 0000000000000000(0000) GS:ffff8880b8600000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 000000110c335fd7 CR3: 00000000118ae000 CR4: 00000000003526f0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 ---------------- Code disassembly (best guess): 0: 48 c1 e8 03 shr $0x3,%rax 4: 42 80 3c 20 00 cmpb $0x0,(%rax,%r12,1) 9: 74 08 je 0x13 b: 48 89 ef mov %rbp,%rdi e: e8 ba 1d 93 f7 call 0xf7931dcd 13: 48 8b 6d 00 mov 0x0(%rbp),%rbp 17: 48 85 ed test %rbp,%rbp 1a: 74 30 je 0x4c 1c: 48 81 c5 90 00 00 00 add $0x90,%rbp 23: 48 89 e8 mov %rbp,%rax 26: 48 c1 e8 03 shr $0x3,%rax * 2a: 42 80 3c 20 00 cmpb $0x0,(%rax,%r12,1) <-- trapping instruction 2f: 74 08 je 0x39 31: 48 89 ef mov %rbp,%rdi 34: e8 94 1d 93 f7 call 0xf7931dcd 39: 48 8b 45 00 mov 0x0(%rbp),%rax 3d: 4c 39 f0 cmp %r14,%rax --- This report is generated by a bot. It may contain errors. See https://goo.gl/tpsmEJ for more information about syzbot. syzbot engineers can be reached at syzkaller@googlegroups.com. syzbot will keep track of this issue. See: https://goo.gl/tpsmEJ#status for how to communicate with syzbot. If the report is already addressed, let syzbot know by replying with: #syz fix: exact-commit-title If you want to overwrite report's subsystems, reply with: #syz set subsystems: new-subsystem (See the list of subsystem names on the web dashboard) If the report is a duplicate of another one, reply with: #syz dup: exact-subject-of-another-report If you want to undo deduplication, reply with: #syz undup