From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from mail-oi1-f198.google.com (mail-oi1-f198.google.com [209.85.167.198]) (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 DB2BB279DAD for ; Mon, 21 Sep 2026 03:11:43 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=209.85.167.198 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1789960305; cv=none; b=a7XmWWcjuWSnqeDgev/r654roiB5+39axXTSVlI7vKuv6veEJJ8PQ8pWH50XI0lshREZKU1Hu9i1+NXwMmqPV0lhUQtUIwr8FZnPwQVF+TEv/OCMaR07B9r2l4PJhqCFzDbTGEYZGKBec2fQO8dWGwoRp2sZg1MmKWeT13VLad0= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1789960305; c=relaxed/simple; bh=zE5aQWnV+dCqVW4nD3efUQl4HwQKG8nYny5sNkR1p/Q=; h=MIME-Version:Date:Message-ID:Subject:From:To:Cc:Content-Type; b=o6U6NMYlUic1e7zGViGtIKBy6dEzuaSG10AB7CHOZ9QRJU+P5rXJHj2FtjlbZAWTncI1cS7HiRkf6ZWIaaKN8XGJVDvmT70zWNpbqQLSOIWY0fMG7PQIAsYvYLzgw3YmqrNEcAWRndycuFkZ5GGLPTwM50bcGI8oA0PSRRnE0EY= 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=209.85.167.198 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-f198.google.com with SMTP id 5614622812f47-4b2f2b8d88fso4221676b6e.2 for ; Sun, 20 Sep 2026 20:11:43 -0700 (PDT) X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20260707; t=1789960303; x=1790565103; h=content-type:cc:to:from:subject:message-id:date:mime-version :x-gm-message-state:from:to:cc:subject:date:message-id:reply-to :content-type; bh=bEm9o5XFk2Ap+Jz8+GP1jKV4jCizWW9gtbeG/zz1z7o=; b=jWerXK4MV0Y8mgUa5iOX9cQZUXwJs7fp4IcKbhGVfsmMph5SOW/qExjFhkFp/EzH70 86V5mUR5XjX5m7VNs6unCXMFGtbvhFbJzY1Nu619VUVoYoX6C83q2XyMfWFwSl5XNtpn V4gWm9HdeUj7PrmoqSKqJl2EOyzjKQfkZnP3sif62NYmLkPxRLcPviWUtdRku9Atl84d YL0JCC0dp0P99EwAmenFHluu6ETNWbvSk4nPQe5I14OM3rswDUHy2/gdPuiXLq24N4kJ mU4ynJtrFqoM2/Rxhm3xZ/5n/S+5oFFU5N0tvz0GCTLaiVilsdLRXNHVpRkr33mzUY/N t3VQ== X-Gm-Message-State: AFuF++k81SM2nkM436HYFw60MNGBed7+y7rnaur769mNEubcJSS3uJM5 tG9wIhcP3usDOUvUoW12sY6bRwdUT7r6gBKvbX1uXIc/S+AwEbsrQpVD1gRe+9x9ex3KaM7uivR JFkWGTy5T2iM96pNnjB/PHAuvyT3rbrUuRYesvLB4jw5fIEdyjiSjqILTPq4= Precedence: bulk X-Mailing-List: syzbot@lists.linux.dev List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 X-Received: by 2002:a05:6808:4f2b:b0:4c5:238e:b14d with SMTP id 5614622812f47-4ccf6746423mr12048968b6e.6.1789960302740; Sun, 20 Sep 2026 20:11:42 -0700 (PDT) Date: Sun, 20 Sep 2026 20:11:42 -0700 X-Google-Appengine-App-Id: s~syzkaller X-Google-Appengine-App-Id-Alias: syzkaller Message-ID: <6ab0a06e.514bccd6.255447.000c.GAE@google.com> Subject: [moderation/CI] Re: net: opt loopback into instance locking From: syzbot ci To: syzkaller-upstream-moderation@googlegroups.com Cc: syzbot@lists.linux.dev Content-Type: text/plain; charset="UTF-8" syzbot ci has tested the following series [v1] net: opt loopback into instance locking https://lore.kernel.org/all/20260918210419.4088201-1-kuba@kernel.org * [PATCH net-next] net: opt loopback into instance locking and found the following issue: WARNING in ipv6_add_dev Full report is available here: https://ci.syzbot.org/series/f12bc892-cfa6-4277-beac-794482c9a3f7 *** WARNING in ipv6_add_dev tree: net-next URL: https://kernel.googlesource.com/pub/scm/linux/kernel/git/netdev/net-next.git base: 8830e65ed46de41f849eefb8ba227d4852c460f6 arch: amd64 compiler: Debian clang version 22.1.8 (++20260613092233+e80beda6e255-1~exp1~20260613092250.77), Debian LLD 22.1.8 config: https://ci.syzbot.org/builds/ae142b5c-beb2-4c41-814c-2cd3e14bdbb0/config usbcore: registered new interface driver snd-usb-hiface usbcore: registered new interface driver snd-bcd2000 usbcore: registered new interface driver snd_usb_pod usbcore: registered new interface driver snd_usb_podhd usbcore: registered new interface driver snd_usb_toneport usbcore: registered new interface driver snd_usb_variax drop_monitor: Initializing network drop monitor service NET: Registered PF_LLC protocol family GACT probability on Mirror/redirect action on Simple TC action Loaded u32 classifier Performance counters on input device check on Actions configured nf_conntrack_irc: The irc conntrack helper is scheduled for removal. Please contact the netfilter-devel mailing list if you still need this. The pptp conntrack helper is scheduled for removal. Please contact the netfilter-devel mailing list if you still need this. The DCCP match is deprecated and scheduled to be removed in 2027. Please contact the netfilter-devel mailing list or update your iptables rules xt_time: kernel timezone is -0000 IPVS: Registered protocols (TCP, UDP, SCTP, AH, ESP) IPVS: Connection hash table configured (size=4096, memory=32Kbytes) IPVS: ipvs loaded. IPVS: [rr] scheduler registered. IPVS: [wrr] scheduler registered. IPVS: [lc] scheduler registered. IPVS: [wlc] scheduler registered. IPVS: [fo] scheduler registered. IPVS: [ovf] scheduler registered. IPVS: [lblc] scheduler registered. IPVS: [lblcr] scheduler registered. IPVS: [dh] scheduler registered. IPVS: [sh] scheduler registered. IPVS: [mh] scheduler registered. IPVS: [sed] scheduler registered. IPVS: [nq] scheduler registered. IPVS: [twos] scheduler registered. IPVS: [sip] pe registered. ipip: IPv4 and MPLS over IPv4 tunneling driver gre: GRE over IPv4 demultiplexer driver ip_gre: GRE over IPv4 tunneling driver IPv4 over IPsec tunneling driver Initializing XFRM netlink socket IPsec XFRM device driver xfrm_iptfs: IPsec IP-TFS tunnel mode module NET: Registered PF_INET6 protocol family ------------[ cut here ]------------ debug_locks && !(lock_is_held(&(&dev->lock)->dep_map) != 0) WARNING: ./include/net/netdev_lock.h:70 at ipv6_add_dev+0xfc1/0x1400, CPU#0: swapper/0/1 Modules linked in: CPU: 0 UID: 0 PID: 1 Comm: swapper/0 Not tainted syzkaller #0 PREEMPT(full) Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.2-debian-1.16.2-1 04/01/2014 RIP: 0010:ipv6_add_dev+0xfc1/0x1400 Code: ff ff e8 a2 6e 3a f7 48 8d 3d 6b 56 fd 05 48 c7 c6 80 a2 32 8d ba 80 01 00 00 67 48 0f b9 3a e9 ab f0 ff ff e8 80 6e 3a f7 90 <0f> 0b 90 e9 cb f1 ff ff e8 72 6e 3a f7 48 8d 3d 5b 56 fd 05 48 c7 RSP: 0000:ffffc900000678c0 EFLAGS: 00010293 RAX: ffffffff8a8d6400 RBX: dffffc0000000000 RCX: ffff888102abda00 RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000000 RBP: 0000000000000000 R08: ffffffff90253707 R09: 1ffffffff204a6e0 R10: dffffc0000000000 R11: fffffbfff204a6e1 R12: dffffc0000000000 R13: ffff88810c036000 R14: ffffffff8caa6a10 R15: ffff88810c036008 FS: 0000000000000000(0000) GS:ffff88818d6cd000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: ffff88823ffff000 CR3: 000000000eb48000 CR4: 00000000000006f0 Call Trace: addrconf_init+0x8b/0x170 inet6_init+0x228/0x3f0 do_one_initcall+0x250/0x870 do_initcall_level+0x10a/0x1a0 do_initcalls+0x59/0xa0 kernel_init_freeable+0x29d/0x3e0 kernel_init+0x22/0x1d0 ret_from_fork+0x514/0xb70 ret_from_fork_asm+0x1a/0x30 *** If these findings have caused you to resend the series or submit a separate fix, please add the following tag to your commit message: Tested-by: syzbot@syzkaller.appspotmail.com --- This report is generated by a bot. It may contain errors. syzbot ci engineers can be reached at syzkaller@googlegroups.com. To test a fix for this bug, please reply with `#syz test` (on a separate line) and attach the patch to the email. Notes: - The patch will be applied on top of the tested series (as an incremental fix). - To test a new version of the whole series, please send it directly to syzbot@lists.linux.dev. - Arguments like custom git repos and branches are not supported. The email will later be sent to: [andrew@lunn.ch davem@davemloft.net edumazet@google.com horms@kernel.org kuba@kernel.org netdev@vger.kernel.org pabeni@redhat.com] If the report looks fine to you, reply with: #syz upstream If the report is a false positive, reply with #syz invalid