From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from mail-io1-f77.google.com (mail-io1-f77.google.com [209.85.166.77]) (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 9A06B3F9D2 for ; Tue, 12 Aug 2025 19:34:33 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=209.85.166.77 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1755027275; cv=none; b=k+PjXujA9zjinfWOJVgi64MgbATfhnsT8Gb1zu1Wa0sGgzMKJpq0b46nqTqgml/ClRToZp+8cQbe9IbKs08HGA8UcYC1yEgnxNNMRRaqXHA20NlwFQkaJ6yHwZO+3eHYEcTrcUwSBwxtHBVx0X/kkHOwDxAIIULLDDpEEI6pO9A= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1755027275; c=relaxed/simple; bh=BttOEe0om/j6yDdmbqxNGW55BljQ0fFUrDOkjIRGnWs=; h=MIME-Version:Date:Message-ID:Subject:From:To:Content-Type; b=Mg1cgDQPZXli2Sa2nVyOvCaHGGxWvF3nmmixX+9U1HziryadtxQPTRATNx3taPJIHqWy5F8OFRpQScz2Qgq+iypQcjeo39yT0rk15jYJ5WhlThs1bZXDZQo+8/4/8SK8tIzMSrI4FFsQF7ORBhqQe701I6c8NSe2x0io+DHaP78= 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=209.85.166.77 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-io1-f77.google.com with SMTP id ca18e2360f4ac-881a214c747so729961839f.0 for ; Tue, 12 Aug 2025 12:34:33 -0700 (PDT) X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20230601; t=1755027273; x=1755632073; h=to:from:subject:message-id:date:mime-version:x-gm-message-state :from:to:cc:subject:date:message-id:reply-to; bh=9Ky1xpaJkHaMalBKIFIDbZuOCRjkd+geBcZ++RLq1Ow=; b=SIlmC5RHzT7EPQ1YX8D2NC1Ls2j0TETUQhfMjOVjnwzqGbJdWza6tVQc5cQd6jklDX wRaj8rYEwMAZPnBCXbkOE6l+I64N2xIeoz14hHHRJNgKl7j0RuoUmUJBByP+h3r9oWax bAjAQaE9poZpRzHF03q9zCbfJNpXCBfWehDK2CKakkL+0PTDblACK7Ra5CgruRccd7s8 ZDXCo5WFIRkdxt41AlfLTHl4bzjacV54SWkXGds4EtTrSwxTU9GKdZDNEUlKH4a2ePU1 BkgWUXkG1tnxOO/AQ9fwLbt8taU8hauSEXuGKMQGXVBIEKVz+cb9RfPdSfhY7Mh5RJzv ia0w== X-Forwarded-Encrypted: i=1; AJvYcCVmP6TnRSzNMudV/eEpane/iz4FTbQddUmKbGQVQmum0L2gItD0gYAVYAbpYjzfvOzOLC/JZ8K1aySyRrg=@vger.kernel.org X-Gm-Message-State: AOJu0Yz1kSkCX/2qUguUFZi39u4oJqAwQTs/apVg+Cc7Q+4edxDKG9Jl S0Scd0kgPG+Vt/Gvfg87VqU824xqvXl5PQqjkg+dR1cj984BnHfigW81RfMhEsW71uZ+JpPawCG zAyAK0dwzIibpCW3AXWvlj1TyxVYxM/dlerDVVd8128+ZaJne4NzGAfUZDV8= X-Google-Smtp-Source: AGHT+IFKeeTHkEW2QWzDj6h1W/75n764YasEY6mwj+vq18FxJ/vvGjxLiwPOEcnzBUw56WVj3zu8MlLroMx2oYu/7ooFJBRXEJBx Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 X-Received: by 2002:a05:6602:6b10:b0:883:f8dc:df53 with SMTP id ca18e2360f4ac-8842960a458mr66395839f.3.1755027272782; Tue, 12 Aug 2025 12:34:32 -0700 (PDT) Date: Tue, 12 Aug 2025 12:34:32 -0700 X-Google-Appengine-App-Id: s~syzkaller X-Google-Appengine-App-Id-Alias: syzkaller Message-ID: <689b9748.050a0220.51d73.00b6.GAE@google.com> Subject: [syzbot] [net?] general protection fault in llc_mac_hdr_init From: syzbot To: davem@davemloft.net, 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: 37816488247d Merge tag 'net-6.17-rc1' of git://git.kernel... git tree: upstream console output: https://syzkaller.appspot.com/x/log.txt?x=14cd61a2580000 kernel config: https://syzkaller.appspot.com/x/.config?x=658effe8a2c01c74 dashboard link: https://syzkaller.appspot.com/bug?extid=5da6dcdc18849d9fa01e compiler: gcc (Debian 12.2.0-14+deb12u1) 12.2.0, 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/8430292542cd/disk-37816488.raw.xz vmlinux: https://storage.googleapis.com/syzbot-assets/69cd308fcca9/vmlinux-37816488.xz kernel image: https://storage.googleapis.com/syzbot-assets/a39d85d0b6c2/bzImage-37816488.xz IMPORTANT: if you fix the issue, please add the following tag to the commit: Reported-by: syzbot+5da6dcdc18849d9fa01e@syzkaller.appspotmail.com Oops: general protection fault, probably for non-canonical address 0xdffffc000ad6eb84: 0000 [#1] SMP KASAN NOPTI KASAN: probably user-memory-access in range [0x0000000056b75c20-0x0000000056b75c27] CPU: 1 UID: 0 PID: 0 Comm: swapper/1 Not tainted 6.16.0-syzkaller-12063-g37816488247d #0 PREEMPT(full) Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/12/2025 RIP: 0010:llc_mac_hdr_init+0x2f/0x1a0 net/llc/llc_output.c:30 Code: 56 49 89 f6 41 55 49 89 d5 41 54 55 53 48 89 fb e8 16 2d 30 f8 48 8d 7b 10 48 b8 00 00 00 00 00 fc ff df 48 89 fa 48 c1 ea 03 <80> 3c 02 00 0f 85 3b 01 00 00 48 b8 00 00 00 00 00 fc ff df 48 8b RSP: 0018:ffffc90000a08c28 EFLAGS: 00010206 RAX: dffffc0000000000 RBX: 0000000056b75c10 RCX: ffffffff81a7e2de RDX: 000000000ad6eb84 RSI: ffffffff898b660a RDI: 0000000056b75c20 RBP: ffff888056b75c10 R08: 0000000000000001 R09: 0000000000000000 R10: 0000000000000001 R11: 0000000000000000 R12: 1ffff9200014118f R13: ffff88801e2ea440 R14: ffffffff81a7df41 R15: 0000000000000001 FS: 0000000000000000(0000) GS:ffff8881247c4000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 0000001b3200fff8 CR3: 0000000027c8f000 CR4: 00000000003526f0 Call Trace: llc_conn_ac_send_i_rsp_f_set_ackpf net/llc/llc_c_ac.c:920 [inline] llc_conn_ac_send_i_as_ack+0x31c/0x900 net/llc/llc_c_ac.c:945 Modules linked in: ---[ end trace 0000000000000000 ]--- RIP: 0010:llc_mac_hdr_init+0x2f/0x1a0 net/llc/llc_output.c:30 Code: 56 49 89 f6 41 55 49 89 d5 41 54 55 53 48 89 fb e8 16 2d 30 f8 48 8d 7b 10 48 b8 00 00 00 00 00 fc ff df 48 89 fa 48 c1 ea 03 <80> 3c 02 00 0f 85 3b 01 00 00 48 b8 00 00 00 00 00 fc ff df 48 8b RSP: 0018:ffffc90000a08c28 EFLAGS: 00010206 RAX: dffffc0000000000 RBX: 0000000056b75c10 RCX: ffffffff81a7e2de RDX: 000000000ad6eb84 RSI: ffffffff898b660a RDI: 0000000056b75c20 RBP: ffff888056b75c10 R08: 0000000000000001 R09: 0000000000000000 R10: 0000000000000001 R11: 0000000000000000 R12: 1ffff9200014118f R13: ffff88801e2ea440 R14: ffffffff81a7df41 R15: 0000000000000001 FS: 0000000000000000(0000) GS:ffff8881247c4000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 0000001b3200fff8 CR3: 0000000027c8f000 CR4: 00000000003526f0 ---------------- Code disassembly (best guess): 0: 56 push %rsi 1: 49 89 f6 mov %rsi,%r14 4: 41 55 push %r13 6: 49 89 d5 mov %rdx,%r13 9: 41 54 push %r12 b: 55 push %rbp c: 53 push %rbx d: 48 89 fb mov %rdi,%rbx 10: e8 16 2d 30 f8 call 0xf8302d2b 15: 48 8d 7b 10 lea 0x10(%rbx),%rdi 19: 48 b8 00 00 00 00 00 movabs $0xdffffc0000000000,%rax 20: fc ff df 23: 48 89 fa mov %rdi,%rdx 26: 48 c1 ea 03 shr $0x3,%rdx * 2a: 80 3c 02 00 cmpb $0x0,(%rdx,%rax,1) <-- trapping instruction 2e: 0f 85 3b 01 00 00 jne 0x16f 34: 48 b8 00 00 00 00 00 movabs $0xdffffc0000000000,%rax 3b: fc ff df 3e: 48 rex.W 3f: 8b .byte 0x8b --- 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