From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from mail-oi1-f205.google.com (mail-oi1-f205.google.com [209.85.167.205]) (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 E0BA230148A for ; Sun, 2 Aug 2026 18:48:38 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=209.85.167.205 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1785696520; cv=none; b=VP0/xVGavEdegfZIHZEXsxgEzRQErbl6aTrRHvKlgRb3w4umrCMbwZqMSPbJ9vE9ZtqeH6a6f1tBXwhWMXOpm9PVI4oFvd9gFfgCTPPh+wpGscQVQcX2SjpCWjVtrNQoXw03YdZMTgh3xicnPpKGPASs9H60vTB08K6is/Xl7FU= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1785696520; c=relaxed/simple; bh=sGq+odP6TlzhDeK4Kw02zvpGlY5+ERWu1BY5PE7Nu8o=; h=MIME-Version:Date:Message-ID:Subject:From:To:Content-Type; b=YpJvYccwqGDT2J3aAIbWxKy5TeGSxs0d/nJXLc1L88Gd9llhUJ3H2oNKpo13BCiwJu8LctADNZHRneqSAr+NvXj56/B12pL2zUoZaKve1yZUpz/udsRrqjUOqLmL2I1xfgfb6VgKYcOVJgRKt+jAAaIVnnaOL4Me+7g/MzLmfUQ= 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=209.85.167.205 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-f205.google.com with SMTP id 5614622812f47-4ad778bacbeso3965632b6e.1 for ; Sun, 02 Aug 2026 11:48:38 -0700 (PDT) X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20251104; t=1785696518; x=1786301318; h=content-type:to:from:subject:message-id:date:mime-version :x-gm-message-state:from:to:cc:subject:date:message-id:reply-to :content-type; bh=LCIBAN2cYYYrLre0WuiWXMKYurAAnLOHcZZe9FXWc88=; b=BANlPB0znFvS05c0Fp1TDrLW34REmCfw1JojYHgsOG6aPO0xoQN2kHMysUS41wI1ok k3216tusEl2q7EdsqevdqL1iqxc3lfdf0DJfjAAZYPIPny2FAiY4egMwFF7PnHSGAt+p wcy2w4P2VGSVGrfDZINCHxYVY+9xAUykHIx2lM18IZMNY79FiGX8UvrWhaQJ/pbM1VKu Ghv8+FUe5dq87orxgg00f9qtNrY7iUfoJAtOXuGy13STj83mKNUR5yavwYQ01usm5MhK 7eiVE4SN/9ba4li9Y3NKA6zjSfbTF71dzLKog1+9oFmsZJjCEfBcRSIE0tKmL1EqmocE suVA== X-Forwarded-Encrypted: i=1; AHgh+RolmAWl8JMLsmdIzcPgTcyBTgR5JmtPFCs5yWHFV4DSEFCPBvQXwFOI5ZgYbXOZPyKAA2gkPqY8Qdn9EYc=@vger.kernel.org X-Gm-Message-State: AOJu0YyMjpnOLPVkWpH/sJ2T4GkGjbBLwSGWaPpe9XFfddAJAVuvTTIM T0YKRS610evORYl7fo2uO4GZCrexP+6/M6pTYVxoTRH+U4NWgjwQcT6b5lvygxqa5eaPILKSqzb v5Uu6MNPLH52CGPTgGux3rPjmwSM2jaQq5KAQJLWZ85tpjEJOXBUML7dGzfU= Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 X-Received: by 2002:a05:6808:d52:b0:497:deab:2bfe with SMTP id 5614622812f47-4af5dfb3c0dmr12641156b6e.1.1785696517879; Sun, 02 Aug 2026 11:48:37 -0700 (PDT) Date: Sun, 02 Aug 2026 11:48:37 -0700 X-Google-Appengine-App-Id: s~syzkaller X-Google-Appengine-App-Id-Alias: syzkaller Message-ID: <6a6f9105.1aa927e4.17d4bf.001b.GAE@google.com> Subject: [syzbot] [net?] WARNING in ipgre_xmit (2) From: syzbot To: davem@davemloft.net, dsahern@kernel.org, edumazet@google.com, horms@kernel.org, idosch@nvidia.com, 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: fc02acf6ac0c Merge tag 'platform-drivers-x86-v7.2-4' of gi.. git tree: upstream console output: https://syzkaller.appspot.com/x/log.txt?x=1314d632580000 kernel config: https://syzkaller.appspot.com/x/.config?x=c05be6c9b0d36cb9 dashboard link: https://syzkaller.appspot.com/bug?extid=f16c1b285c9f63994eec compiler: Debian clang version 22.1.8 (++20260613092233+e80beda6e255-1~exp1~20260613092250.77), Debian LLD 22.1.8 Unfortunately, I don't have any reproducer for this issue yet. Downloadable assets: disk image (non-bootable): https://storage.googleapis.com/syzbot-assets/d900f083ada3/non_bootable_disk-fc02acf6.raw.xz vmlinux: https://storage.googleapis.com/syzbot-assets/a67a14a03b39/vmlinux-fc02acf6.xz kernel image: https://storage.googleapis.com/syzbot-assets/328affe48b77/bzImage-fc02acf6.xz IMPORTANT: if you fix the issue, please add the following tag to the commit: Reported-by: syzbot+f16c1b285c9f63994eec@syzkaller.appspotmail.com ------------[ cut here ]------------ len > ((int)(~0U >> 1)) WARNING: ./include/linux/skbuff.h:2864 at pskb_may_pull_reason include/linux/skbuff.h:2864 [inline], CPU#0: syz.0.0/5325 WARNING: ./include/linux/skbuff.h:2864 at pskb_network_may_pull_reason include/linux/skbuff.h:3265 [inline], CPU#0: syz.0.0/5325 WARNING: ./include/linux/skbuff.h:2864 at pskb_inet_may_pull_reason include/net/ip_tunnels.h:481 [inline], CPU#0: syz.0.0/5325 WARNING: ./include/linux/skbuff.h:2864 at pskb_inet_may_pull include/net/ip_tunnels.h:486 [inline], CPU#0: syz.0.0/5325 WARNING: ./include/linux/skbuff.h:2864 at ipgre_xmit+0x958/0xcd0 net/ipv4/ip_gre.c:658, CPU#0: syz.0.0/5325 Modules linked in: CPU: 0 UID: 0 PID: 5325 Comm: syz.0.0 Not tainted syzkaller #0 PREEMPT(full) Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.3-debian-1.16.3-2 04/01/2014 RIP: 0010:pskb_may_pull_reason include/linux/skbuff.h:2864 [inline] RIP: 0010:pskb_network_may_pull_reason include/linux/skbuff.h:3265 [inline] RIP: 0010:pskb_inet_may_pull_reason include/net/ip_tunnels.h:481 [inline] RIP: 0010:pskb_inet_may_pull include/net/ip_tunnels.h:486 [inline] RIP: 0010:ipgre_xmit+0x958/0xcd0 net/ipv4/ip_gre.c:658 Code: 48 3b 84 24 80 00 00 00 0f 85 3b 01 00 00 31 c0 48 8d 65 d8 5b 41 5c 41 5d 41 5e 41 5f 5d e9 3f e9 77 01 cc e8 e9 05 69 f7 90 <0f> 0b 90 e9 08 f8 ff ff 44 89 ff 44 89 e6 e8 95 07 69 f7 45 39 e7 RSP: 0018:ffffc9000e4cf600 EFLAGS: 00010283 RAX: ffffffff8a5e0e67 RBX: 0000000000000000 RCX: 0000000000100000 RDX: ffffc9000eef2000 RSI: 00000000000000bb RDI: 00000000000000bc RBP: ffffc9000e4cf6d0 R08: ffff888035d20000 R09: 0000000000000002 R10: 0000000000004888 R11: ffffffff8a5e0510 R12: ffff88801244e000 R13: dffffc0000000000 R14: ffff888043f173c0 R15: 00000000ffffff40 FS: 00007f99c17006c0(0000) GS:ffff88808c543000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007f99c0a12a18 CR3: 0000000042b19000 CR4: 0000000000352ef0 Call Trace: __netdev_start_xmit include/linux/netdevice.h:5400 [inline] netdev_start_xmit include/linux/netdevice.h:5409 [inline] __dev_direct_xmit+0x4b6/0x730 net/core/dev.c:4942 __xsk_generic_xmit net/xdp/xsk.c:1079 [inline] xsk_generic_xmit+0x277a/0x40a0 net/xdp/xsk.c:1120 __xsk_sendmsg net/xdp/xsk.c:1174 [inline] xsk_sendmsg+0x482/0x810 net/xdp/xsk.c:1184 sock_sendmsg_nosec+0x13a/0x180 net/socket.c:775 __sock_sendmsg net/socket.c:790 [inline] ____sys_sendmsg+0x54e/0x850 net/socket.c:2684 ___sys_sendmsg+0x2a5/0x360 net/socket.c:2738 __sys_sendmsg net/socket.c:2770 [inline] __do_sys_sendmsg net/socket.c:2775 [inline] __se_sys_sendmsg net/socket.c:2773 [inline] __x64_sys_sendmsg+0x1b1/0x290 net/socket.c:2773 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: 0033:0x7f99c079de99 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:00007f99c16fffe8 EFLAGS: 00000246 ORIG_RAX: 000000000000002e RAX: ffffffffffffffda RBX: 00007f99c0a25fa0 RCX: 00007f99c079de99 RDX: 0000000000000040 RSI: 0000200000000700 RDI: 0000000000000006 RBP: 00007f99c0833eaf R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 00007f99c0a26038 R14: 00007f99c0a25fa0 R15: 00007ffdd0e42b38 --- 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