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 73FAA22B8A9 for ; Tue, 3 Jun 2025 11:08:32 +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=1748948914; cv=none; b=jr4bu8UMLqJr2XO3dwhhYuqH7SEzNDTYLBwsxXZ9OEtU+Og4PMnGOQ8BNeHyiPM8C2dgt8IXHgyBrHcmdWywsLhmBC8alhtsR0QIU6inGZcgh3VYL8A6eXm6cnEVGVEHVo4KS9IrmBSQTneBP58DY8+V0yHaaDy2KrTJVlVgb2k= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1748948914; c=relaxed/simple; bh=2Kx1GWjW6U0CGH7l5TaSZn+mXFI4oOy34e1aGHejjYQ=; h=MIME-Version:Date:Message-ID:Subject:From:To:Content-Type; b=cqZzTy6GRNLFBqVZoUbKgDO8B5xonpHR/JXxDdJYdX9JrhR1B7AOUF2ILaTwVYyPqjFhuKsl0PxMtM69/1M5uQ0z0qzl95jvJcm355q0KiRW99t4DK0069WXMADVXl7sY2Oh1pxM1a4wHkRaZel592jC/KhVWXffkqN/kF4D9jA= 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-3dca1268a57so67805695ab.2 for ; Tue, 03 Jun 2025 04:08:32 -0700 (PDT) X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20230601; t=1748948911; x=1749553711; h=to:from:subject:message-id:date:mime-version:x-gm-message-state :from:to:cc:subject:date:message-id:reply-to; bh=5/nHsQLvpfzxpV76AdA4ehHL3uw7J7szSF26Al6AlNA=; b=JnBrspApevZzySkZ+vqOx0Ep8lNl3qZ12CPP8eUbF0lL4Tjr7OjLHe5+BF/wy+14Cm OkoDM+bRr9LhlRXUh0zXW+HVqrRrdYyWry7FmOECDyHAxGrhRZ/LykkvlqPpMQm9Mn5L zA/l61Lqx2j4HjENkJP+JITyRIt+LF2TD+VGSO1DB9Z8qcxvclzeINbv/lH2HGOhCtrh 78KZv173XiKiRZn3+BjZ+sReHa6Hhpornw60WMAd5elwcKjFOXnuv2DORcbLKi5qUSQY E5W50UEcUCtH3e6KGGl3avxxctp06CI8RXUutVUNzPIPwoTdCXNzxtpAyYSa6rPMdIWl q5Ag== X-Forwarded-Encrypted: i=1; AJvYcCWIloMEH5F6l/myDI77Efion2CP81sJDOkPLX0/+kDT/6y7YXEykKDQcZhmdBT4EISeSLYkWPY=@vger.kernel.org X-Gm-Message-State: AOJu0YzhZqYuRbyLPMWhQ11kl69YOAD9DKXIBu5OsW+g59tPNU/RnCH9 VWTynOCwcPwxL1Bnor5w50QeM8MuOY/J6AsAZBOOOnaczYDIZucmeP9CnRZG0GPr0Jl3yKyCnZL bW0NNRCRhwsXx2otBnx2eX9qPqUcreucTcFW9NRsBuoN8JrRJUPTzAIbHFsk= X-Google-Smtp-Source: AGHT+IH2x9LqNtnz9cIy+uW9Swspw1k7Qx62eqgRB5NalqMWt9wSMw71fW+IrETZcSFPUS3EwFzcRzphNnhivvqmGWJwYARjyWw3 Precedence: bulk X-Mailing-List: netdev@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 X-Received: by 2002:a05:6e02:1fef:b0:3dd:792d:ce42 with SMTP id e9e14a558f8ab-3dd9c738eb3mr162757535ab.0.1748948911543; Tue, 03 Jun 2025 04:08:31 -0700 (PDT) Date: Tue, 03 Jun 2025 04:08:31 -0700 X-Google-Appengine-App-Id: s~syzkaller X-Google-Appengine-App-Id-Alias: syzkaller Message-ID: <683ed7af.a00a0220.d8eae.0068.GAE@google.com> Subject: [syzbot] [net?] general protection fault in ip_mc_up 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: feacb1774bd5 Merge tag 'sched_ext-for-6.16' of git://git.k.. git tree: upstream console output: https://syzkaller.appspot.com/x/log.txt?x=16ace6d4580000 kernel config: https://syzkaller.appspot.com/x/.config?x=d4c7a3e8691d5cf dashboard link: https://syzkaller.appspot.com/bug?extid=89affbc8a292a442d4cb compiler: Debian clang version 20.1.6 (++20250514063057+1e4d39e07757-1~exp1~20250514183223.118), Debian LLD 20.1.6 Unfortunately, I don't have any reproducer for this issue yet. Downloadable assets: disk image: https://storage.googleapis.com/syzbot-assets/73deb6840db8/disk-feacb177.raw.xz vmlinux: https://storage.googleapis.com/syzbot-assets/5908317c8cf4/vmlinux-feacb177.xz kernel image: https://storage.googleapis.com/syzbot-assets/4ab4d0c65d47/bzImage-feacb177.xz IMPORTANT: if you fix the issue, please add the following tag to the commit: Reported-by: syzbot+89affbc8a292a442d4cb@syzkaller.appspotmail.com Oops: general protection fault, probably for non-canonical address 0xdffffc0000000021: 0000 [#1] SMP KASAN PTI KASAN: null-ptr-deref in range [0x0000000000000108-0x000000000000010f] CPU: 1 UID: 0 PID: 5482 Comm: dhcpcd Not tainted 6.15.0-syzkaller-03589-gfeacb1774bd5 #0 PREEMPT(full) Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 05/07/2025 RIP: 0010:read_pnet include/net/net_namespace.h:409 [inline] RIP: 0010:dev_net include/linux/netdevice.h:2708 [inline] RIP: 0010:ip_mc_reset net/ipv4/igmp.c:1846 [inline] RIP: 0010:ip_mc_up+0x76/0x300 net/ipv4/igmp.c:1879 Code: 89 d8 48 c1 e8 03 42 80 3c 20 00 74 08 48 89 df e8 3f a7 3e f8 41 be 08 01 00 00 4c 03 33 e8 b1 1e 75 01 4c 89 f0 48 c1 e8 03 <42> 80 3c 20 00 74 08 4c 89 f7 e8 1b a7 3e f8 4d 8b 36 48 8d bb 98 RSP: 0018:ffffc90003bcf6d0 EFLAGS: 00010206 RAX: 0000000000000021 RBX: ffff8880330a5800 RCX: ffff88802eae5a00 RDX: 0000000000000000 RSI: 0000000000000001 RDI: 0000000000000000 RBP: 0000000000000001 R08: ffffffff8f2f36a7 R09: 1ffffffff1e5e6d4 R10: dffffc0000000000 R11: fffffbfff1e5e6d5 R12: dffffc0000000000 R13: dffffc0000000000 R14: 0000000000000108 R15: 0000000000000001 FS: 00007f84ecda4740(0000) GS:ffff8881261c0000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007f9187e00000 CR3: 00000000217ac000 CR4: 00000000003526f0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: inetdev_event+0xfb3/0x15b0 net/ipv4/devinet.c:1631 notifier_call_chain+0x1b6/0x3e0 kernel/notifier.c:85 call_netdevice_notifiers_extack net/core/dev.c:2214 [inline] call_netdevice_notifiers net/core/dev.c:2228 [inline] __dev_notify_flags+0x18d/0x2e0 net/core/dev.c:-1 netif_change_flags+0xe8/0x1a0 net/core/dev.c:9422 dev_change_flags+0x130/0x260 net/core/dev_api.c:68 devinet_ioctl+0xbb4/0x1b50 net/ipv4/devinet.c:1200 inet_ioctl+0x3c0/0x4c0 net/ipv4/af_inet.c:1001 sock_do_ioctl+0xd9/0x300 net/socket.c:1190 sock_ioctl+0x576/0x790 net/socket.c:1311 vfs_ioctl fs/ioctl.c:51 [inline] __do_sys_ioctl fs/ioctl.c:907 [inline] __se_sys_ioctl+0xf9/0x170 fs/ioctl.c:893 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline] do_syscall_64+0xfa/0x3b0 arch/x86/entry/syscall_64.c:94 entry_SYSCALL_64_after_hwframe+0x77/0x7f RIP: 0033:0x7f84ecea4378 Code: 00 00 48 8d 44 24 08 48 89 54 24 e0 48 89 44 24 c0 48 8d 44 24 d0 48 89 44 24 c8 b8 10 00 00 00 c7 44 24 b8 10 00 00 00 0f 05 <89> c2 3d 00 f0 ff ff 77 07 89 d0 c3 0f 1f 40 00 48 8b 15 49 3a 0d RSP: 002b:00007ffd5c4009c8 EFLAGS: 00000246 ORIG_RAX: 0000000000000010 RAX: ffffffffffffffda RBX: 000000000000001a RCX: 00007f84ecea4378 RDX: 00007ffd5c410bc0 RSI: 0000000000008914 RDI: 000000000000001a RBP: 0000000000000000 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 00007ffd5c420d60 R13: 00007f84ecda46c8 R14: 0000000000000028 R15: 0000000000008914 Modules linked in: ---[ end trace 0000000000000000 ]--- RIP: 0010:read_pnet include/net/net_namespace.h:409 [inline] RIP: 0010:dev_net include/linux/netdevice.h:2708 [inline] RIP: 0010:ip_mc_reset net/ipv4/igmp.c:1846 [inline] RIP: 0010:ip_mc_up+0x76/0x300 net/ipv4/igmp.c:1879 Code: 89 d8 48 c1 e8 03 42 80 3c 20 00 74 08 48 89 df e8 3f a7 3e f8 41 be 08 01 00 00 4c 03 33 e8 b1 1e 75 01 4c 89 f0 48 c1 e8 03 <42> 80 3c 20 00 74 08 4c 89 f7 e8 1b a7 3e f8 4d 8b 36 48 8d bb 98 RSP: 0018:ffffc90003bcf6d0 EFLAGS: 00010206 RAX: 0000000000000021 RBX: ffff8880330a5800 RCX: ffff88802eae5a00 RDX: 0000000000000000 RSI: 0000000000000001 RDI: 0000000000000000 RBP: 0000000000000001 R08: ffffffff8f2f36a7 R09: 1ffffffff1e5e6d4 R10: dffffc0000000000 R11: fffffbfff1e5e6d5 R12: dffffc0000000000 R13: dffffc0000000000 R14: 0000000000000108 R15: 0000000000000001 FS: 00007f84ecda4740(0000) GS:ffff8881261c0000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 0000001b31206ff8 CR3: 00000000217ac000 CR4: 00000000003526f0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 ---------------- Code disassembly (best guess): 0: 89 d8 mov %ebx,%eax 2: 48 c1 e8 03 shr $0x3,%rax 6: 42 80 3c 20 00 cmpb $0x0,(%rax,%r12,1) b: 74 08 je 0x15 d: 48 89 df mov %rbx,%rdi 10: e8 3f a7 3e f8 call 0xf83ea754 15: 41 be 08 01 00 00 mov $0x108,%r14d 1b: 4c 03 33 add (%rbx),%r14 1e: e8 b1 1e 75 01 call 0x1751ed4 23: 4c 89 f0 mov %r14,%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: 4c 89 f7 mov %r14,%rdi 34: e8 1b a7 3e f8 call 0xf83ea754 39: 4d 8b 36 mov (%r14),%r14 3c: 48 rex.W 3d: 8d .byte 0x8d 3e: bb .byte 0xbb 3f: 98 cwtl --- 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