From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from mail-oi1-f206.google.com (mail-oi1-f206.google.com [209.85.167.206]) (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 A17581A681B for ; Sun, 21 Jun 2026 15:22:22 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=209.85.167.206 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1782055344; cv=none; b=u9fMnaRfU8boLB3GvcfD8THtMBfcsx4uEhn1W/AP3RjP8ZYbdEcwOu6rD6NClUFKcDnQ6rk7eV0yNWyvsba6MMrRnms00dqwgKfhdWxTbRkpoS9qtEelEc8hhqqaZdGLg//rNwQrmYylaHy5r/Ha8or+xXQ7nSWJJVzmwaNRMy0= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1782055344; c=relaxed/simple; bh=D2OmoX80EYpVzzXyMB72P0LcdjZpUs2n/dCeYvAiXF4=; h=MIME-Version:Date:Message-ID:Subject:From:To:Content-Type; b=AHLYSTpA3LhPVtodbne7KKB+dtE9dGSBHNUc6nMFyYGnxmlUj13pDp1v/vsTA3YbtGlRzIW05g2kb5NTRJW3PInhOAOgxMSAmilxvk/Ju3eDrCVrOkhj4i8T60AWiHiASImsq0rjj3kd5ri/iVnUqKwRm14yFtv+68abFYnPiPA= 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=209.85.167.206 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-oi1-f206.google.com with SMTP id 5614622812f47-486e64c8edeso5086252b6e.2 for ; Sun, 21 Jun 2026 08:22:22 -0700 (PDT) X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20251104; t=1782055342; x=1782660142; h=to:from:subject:message-id:date:mime-version:x-gm-message-state :from:to:cc:subject:date:message-id:reply-to; bh=8OP66+xdliyDeoTsReAwv3VQOuWo7JhOPBGVl6ta4HM=; b=IO/I13nXeYJXR2JTj5dPcel/vZjjnT5meA9ShL9QXhSv9wrf5TjFhuOD0H5f6pMJik l91fka2fHc1AsZkW4KJdkfwqOp70yzwQAdkaA7KGx714HzP9u2qaprBcyFj6hqwsKtt8 clZcyt86LSwEz6dhJqUaTGZxBsTEo9vSHIhAG7yrtZDT+k9h0/ZmUUjtysfGbH4gLy9M GDJLmcP5MFuP6M/u2iE/LB5EeFPvqJcOnBMeHZMQ+gGf8YwnrjjS6SeXEuo2/TDXuMEJ 6tJEzj9uOm46TVXbflIi+1Z9Wo9Fhz6MBqfQm2xD8gLdgg0dA+8KSS/1xWyq0W8kDObR U81Q== X-Forwarded-Encrypted: i=1; AFNElJ+2n5PV605qIG+nveYl5uy2W0U2gkNQUsiMXZf3dWSqjDy9O6RrmhLl0i6y8HLgkuBtvSWdids=@vger.kernel.org X-Gm-Message-State: AOJu0YzvUxWXzOGBJPBZ2ogyBy1RyolW3oYDVEzI2YaSty9crTxmAL38 7GJ6aJgsUwl5MG6hhGciip86je8ZVU1wWEmdfEs8oUL/L2QayhjF1BMxX0sUYdqAHVkAHQpGxto 2T6XLhGwFrovqU4ql+BaGY12cPk/cpfKkMlutiQNG3jyxDTv2y97Mffz2RMc= Precedence: bulk X-Mailing-List: netdev@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 X-Received: by 2002:a05:6808:1795:b0:487:5d0c:67e4 with SMTP id 5614622812f47-489ab88ced3mr8804122b6e.0.1782055341741; Sun, 21 Jun 2026 08:22:21 -0700 (PDT) Date: Sun, 21 Jun 2026 08:22:21 -0700 X-Google-Appengine-App-Id: s~syzkaller X-Google-Appengine-App-Id-Alias: syzkaller Message-ID: <6a3801ad.713c5d62.148f7.0007.GAE@google.com> Subject: [syzbot] [net?] WARNING in __ethtool_get_link_ksettings From: syzbot To: andrew@lunn.ch, 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: 4fa3f5fabb30 Add linux-next specific files for 20260616 git tree: linux-next console output: https://syzkaller.appspot.com/x/log.txt?x=1039ffec580000 kernel config: https://syzkaller.appspot.com/x/.config?x=6c414e1864e61ef6 dashboard link: https://syzkaller.appspot.com/bug?extid=09da62a8b78959ceb8bb compiler: Debian clang version 22.1.6 (++20260514074242+fc4aad7b5db3-1~exp1~20260514074407.73), Debian LLD 22.1.6 Unfortunately, I don't have any reproducer for this issue yet. Downloadable assets: disk image: https://storage.googleapis.com/syzbot-assets/bf5b803a695d/disk-4fa3f5fa.raw.xz vmlinux: https://storage.googleapis.com/syzbot-assets/47871e7c589e/vmlinux-4fa3f5fa.xz kernel image: https://storage.googleapis.com/syzbot-assets/53cd9ef32a2b/bzImage-4fa3f5fa.xz IMPORTANT: if you fix the issue, please add the following tag to the commit: Reported-by: syzbot+09da62a8b78959ceb8bb@syzkaller.appspotmail.com netlink: 'syz.3.4736': attribute type 10 has an invalid length. ------------[ cut here ]------------ rtmutex deadlock detected WARNING: kernel/locking/rtmutex.c:1698 at rt_mutex_handle_deadlock+0x21/0xb0 kernel/locking/rtmutex.c:1698, CPU#0: syz.3.4736/19861 Modules linked in: CPU: 0 UID: 0 PID: 19861 Comm: syz.3.4736 Tainted: G L syzkaller #0 PREEMPT_{RT,(full)} Tainted: [L]=SOFTLOCKUP Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 05/09/2026 RIP: 0010:rt_mutex_handle_deadlock+0x21/0xb0 kernel/locking/rtmutex.c:1698 Code: 90 90 90 90 90 90 90 90 90 41 57 41 56 41 55 41 54 53 83 ff dd 0f 85 81 00 00 00 48 89 f7 e8 16 40 01 00 48 8d 3d 3f 2f 5d 04 <67> 48 0f b9 3a 4c 8d 3d 00 00 00 00 65 48 8b 1d 13 2d 42 07 4c 8d RSP: 0018:ffffc90003d760f0 EFLAGS: 00010286 RAX: 0000000080000000 RBX: 00000000ffffffdd RCX: 0000000000000000 RDX: 0000000000000000 RSI: ffffffff8baa3a60 RDI: ffffffff8f8fd220 RBP: ffffc90003d762a0 R08: ffffffff8f8c5ff7 R09: 1ffffffff1f18bfe R10: dffffc0000000000 R11: fffffbfff1f18bff R12: 1ffff920007aec2c R13: ffffffff8b329d22 R14: ffff88805dbb1008 R15: dffffc0000000000 FS: 00007fd5506ae6c0(0000) GS:ffff888125ed3000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 0000000000000000 CR3: 000000003cd08000 CR4: 00000000003526f0 Call Trace: __rt_mutex_slowlock kernel/locking/rtmutex.c:1760 [inline] __rt_mutex_slowlock_locked kernel/locking/rtmutex.c:1787 [inline] rt_mutex_slowlock+0x73c/0x780 kernel/locking/rtmutex.c:1827 __rt_mutex_lock kernel/locking/rtmutex.c:1842 [inline] __mutex_lock_common kernel/locking/rtmutex_api.c:560 [inline] mutex_lock_nested+0x168/0x1d0 kernel/locking/rtmutex_api.c:578 netdev_lock include/linux/netdevice.h:2846 [inline] netdev_lock_ops include/net/netdev_lock.h:42 [inline] __ethtool_get_link_ksettings+0x109/0x250 net/ethtool/ioctl.c:463 bond_update_speed_duplex drivers/net/bonding/bond_main.c:801 [inline] bond_slave_netdev_event drivers/net/bonding/bond_main.c:3982 [inline] bond_netdev_event+0x643/0xf80 drivers/net/bonding/bond_main.c:4089 notifier_call_chain+0x1a5/0x3d0 kernel/notifier.c:85 call_netdevice_notifiers_extack net/core/dev.c:2289 [inline] call_netdevice_notifiers net/core/dev.c:2303 [inline] __dev_notify_flags+0x1aa/0x310 net/core/dev.c:9792 netif_change_flags+0xde/0x1b0 net/core/dev.c:9821 dev_change_flags+0x128/0x260 net/core/dev_api.c:68 vlan_device_event+0x1b4e/0x1f00 net/8021q/vlan.c:494 notifier_call_chain+0x1a5/0x3d0 kernel/notifier.c:85 call_netdevice_notifiers_extack net/core/dev.c:2289 [inline] call_netdevice_notifiers net/core/dev.c:2303 [inline] netif_open+0x10f/0x190 net/core/dev.c:1730 dev_open+0x101/0x220 net/core/dev_api.c:202 bond_enslave+0xeb2/0x3b70 drivers/net/bonding/bond_main.c:2089 do_set_master+0x563/0x720 net/core/rtnetlink.c:3012 do_setlink+0xe7b/0x4670 net/core/rtnetlink.c:3214 rtnl_changelink net/core/rtnetlink.c:3841 [inline] __rtnl_newlink net/core/rtnetlink.c:4014 [inline] rtnl_newlink+0x15c2/0x1bd0 net/core/rtnetlink.c:4151 rtnetlink_rcv_msg+0x802/0xc00 net/core/rtnetlink.c:7068 netlink_rcv_skb+0x226/0x4a0 net/netlink/af_netlink.c:2556 netlink_unicast_kernel net/netlink/af_netlink.c:1319 [inline] netlink_unicast+0x7f5/0x990 net/netlink/af_netlink.c:1345 netlink_sendmsg+0x813/0xb40 net/netlink/af_netlink.c:1900 sock_sendmsg_nosec+0x13a/0x180 net/socket.c:785 __sock_sendmsg net/socket.c:800 [inline] ____sys_sendmsg+0x565/0x870 net/socket.c:2702 ___sys_sendmsg+0x2a5/0x360 net/socket.c:2756 __sys_sendmsg net/socket.c:2788 [inline] __do_sys_sendmsg net/socket.c:2793 [inline] __se_sys_sendmsg net/socket.c:2791 [inline] __x64_sys_sendmsg+0x1b7/0x290 net/socket.c:2791 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline] do_syscall_64+0x174/0x580 arch/x86/entry/syscall_64.c:94 entry_SYSCALL_64_after_hwframe+0x77/0x7f RIP: 0033:0x7fd55245ce59 Code: ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 44 00 00 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 c7 c1 e8 ff ff ff f7 d8 64 89 01 48 RSP: 002b:00007fd5506ae028 EFLAGS: 00000246 ORIG_RAX: 000000000000002e RAX: ffffffffffffffda RBX: 00007fd5526d5fa0 RCX: 00007fd55245ce59 RDX: 0000000000008084 RSI: 0000200000000600 RDI: 0000000000000003 RBP: 00007fd5524f2d6f R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 00007fd5526d6038 R14: 00007fd5526d5fa0 R15: 00007ffdbadd34a8 ---------------- Code disassembly (best guess): 0: 90 nop 1: 90 nop 2: 90 nop 3: 90 nop 4: 90 nop 5: 90 nop 6: 90 nop 7: 90 nop 8: 90 nop 9: 41 57 push %r15 b: 41 56 push %r14 d: 41 55 push %r13 f: 41 54 push %r12 11: 53 push %rbx 12: 83 ff dd cmp $0xffffffdd,%edi 15: 0f 85 81 00 00 00 jne 0x9c 1b: 48 89 f7 mov %rsi,%rdi 1e: e8 16 40 01 00 call 0x14039 23: 48 8d 3d 3f 2f 5d 04 lea 0x45d2f3f(%rip),%rdi # 0x45d2f69 * 2a: 67 48 0f b9 3a ud1 (%edx),%rdi <-- trapping instruction 2f: 4c 8d 3d 00 00 00 00 lea 0x0(%rip),%r15 # 0x36 36: 65 48 8b 1d 13 2d 42 mov %gs:0x7422d13(%rip),%rbx # 0x7422d51 3d: 07 3e: 4c rex.WR 3f: 8d .byte 0x8d --- 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