From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from us-smtp-delivery-124.mimecast.com (us-smtp-delivery-124.mimecast.com [170.10.133.124]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 8300930CD82 for ; Tue, 11 Aug 2026 14:13:25 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=170.10.133.124 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1786457611; cv=none; b=MjAEx6k5ZSF2SPel1Rjq/QxHKoexTygYO0C0hPe3TUYm7PiO9U2KPRAh4nt/XrUc5VvJEq8RYJngAbP9uY2GWWJbkZHQPiforvDpAU5rMGQDyyw0oJ+nvaUfWI/Jj+tPZqzVAenLWaMsY4PPbG7XQ4zzUjZm926HFNt+gKrjw7U= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1786457611; c=relaxed/simple; bh=YgkgldevkpqkUxpLhz/r2/7kAATtbGBxO0Qk5cDt25U=; h=Message-ID:Date:MIME-Version:Subject:To:Cc:References:From: In-Reply-To:Content-Type; b=eEbJvYH+E8xM1/lirUskRJ1/tHzbFUUc/MJ8smb0iUdMFwNRyyt2g9Dl6Fy53Y+sGSMzmSO9UJjF7g5goyTsYWk0ZcunGT+/fOrL3b+XGsoL8xcP6fiRtVSAXhInm4lkfQxyymJvzLDt7SBVvQoFuBpE3kfF/p6X5Czd3U+jD5A= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dmarc=pass (p=quarantine dis=none) header.from=redhat.com; spf=pass smtp.mailfrom=redhat.com; dkim=pass (1024-bit key) header.d=redhat.com header.i=@redhat.com header.b=XFSX5ZSe; dkim=pass (2048-bit key) header.d=redhat.com header.i=@redhat.com header.b=OTs38MUS; arc=none smtp.client-ip=170.10.133.124 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=quarantine dis=none) header.from=redhat.com Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=redhat.com Authentication-Results: smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=redhat.com header.i=@redhat.com header.b="XFSX5ZSe"; dkim=pass (2048-bit key) header.d=redhat.com header.i=@redhat.com header.b="OTs38MUS" DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=redhat.com; s=mimecast20190719; t=1786457604; h=from:from:reply-to:subject:subject:date:date:message-id:message-id: to:to:cc:cc:mime-version:mime-version:content-type:content-type: content-transfer-encoding:content-transfer-encoding: in-reply-to:in-reply-to:references:references; bh=Pm9YNLAgdpW6wG7R3wxCML5MXgPI5Vaa77wS/xXjrGQ=; b=XFSX5ZSep1Q4Tb/H2k7VfKfKCRbwkXMOPhYzhQzdRe0EwOHoiWi0QbmffUd5dSawGnOqjG Yp9uRBNgPYwFClwxgvYfBux9iyau0Fmr7QM06hg7M6j5+iE31tcNHpIPM3r4d127eHAMyR dxDuvrxiD7SbecDE5+jAN5bxwCyYmMs= Received: from mail-wm1-f70.google.com (mail-wm1-f70.google.com [209.85.128.70]) by relay.mimecast.com with ESMTP with STARTTLS (version=TLSv1.3, cipher=TLS_AES_256_GCM_SHA384) id us-mta-210-3E82CC6vPwOJVxlMAWomZw-1; Tue, 11 Aug 2026 10:13:17 -0400 X-MC-Unique: 3E82CC6vPwOJVxlMAWomZw-1 X-Mimecast-MFC-AGG-ID: 3E82CC6vPwOJVxlMAWomZw_1786457596 Received: by mail-wm1-f70.google.com with SMTP id 5b1f17b1804b1-49953abe51fso20321515e9.1 for ; Tue, 11 Aug 2026 07:13:16 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=redhat.com; s=google; t=1786457596; x=1787062396; darn=vger.kernel.org; h=content-transfer-encoding:content-type:in-reply-to:content-language :from:references:cc:to:subject:user-agent:mime-version:date :message-id:from:to:cc:subject:date:message-id:reply-to:content-type; bh=Pm9YNLAgdpW6wG7R3wxCML5MXgPI5Vaa77wS/xXjrGQ=; b=OTs38MUSy3cf7a59Vml/l7823ighE8UxNgA6WYRNwJvI+NkQGqTCPd8dHR9FClCkCN n+PiOPafhgpk+7m2T+tkAZ0Npu6dsW2o+Wi8Gh4v5TVnlXiqbw0vIt8ZqFomAKXThyod LBVbx37SAUUX9alm8niIlz+IjDsZkfxZ5SSUuIYektO3QQ5zg4Jp797g5ZLeElM8g8Oj MrZBJH3yXtKFATsm3Yi9DBQy+d5jjucf/14zp+eMBLUa7DLD/ZO1aTWdOTN2Y4/7Ls45 qXK7ZpJSytAmnjtF2ycoq2V4HBky4/zXsgtKjoyUPwlmQLaIkdiEzBvMyIhJXTKJQhZP CuFg== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20251104; t=1786457596; x=1787062396; h=content-transfer-encoding:content-type:in-reply-to:content-language :from:references:cc:to:subject:user-agent:mime-version:date :message-id:x-gm-gg:x-gm-message-state:from:to:cc:subject:date :message-id:reply-to:content-type; bh=Pm9YNLAgdpW6wG7R3wxCML5MXgPI5Vaa77wS/xXjrGQ=; b=NYVihK6iLMJginSFL95ddjbQwy5uY6br7kUOFhWLQ9az2oU42AUFx7fW6PNqAutpMt Yt+WbAXqzMxPca1SkbPBGDgvcAeJAvaon8wEfc7DqtmhULXr/YtXKrfplfgB7x1Izjml 4i2dElB0eu/QSDsXcIE8d7J5LV3vdILi+Xa3Gio8mYvsmNjscH05V5YBsmhcRBtbOync oKSPsgYCbqUL4IDvVCkTpQZiNeQpK6+uwNFb9jPOqOCbmK+ezVnHgQMEB4JvoCiU6zQs DkfTX9puy0MezrHxeEFNLuc+AF85VeeaATR9DFHV/Ck6xkgwVs0e5QUyj1Xg6UCRlmt3 GwTg== X-Forwarded-Encrypted: i=1; AHgh+RoLHApTAvJIPGsOqEaoZ01W3pfaBEkwYDwkhaNIHrtULhUHRbTUCq/2/unWzOY3nMpyHONYwRg3SpkRcCY=@vger.kernel.org X-Gm-Message-State: AOJu0YwSYhCiabgVWfjwW3hYYtyBPiaMmmUmtS6CkrmVxAztG6Jf92zk Q66ju20IP+zdupk6puyY34O4V4DnkUUnDCCYW/Ew16IrG3Tko8KVmMuVJWKmBINw+STyJ3fEMom 6bQkLvJAvdWL+pQyRoPP8UK0jqJAekqz4noS3lsTG8yB34LGzpKilm4NRkQiKKvQ9oA== X-Gm-Gg: AR+sD1303nWrdgCEg8pj0ikAGl7HufE7ww4gLNLBJVhGqxFgSOP1hmMbBLb7BqTdHXr H9YCS7bxftgRwgbhZd7VxWREvZkAsdGdZLkdbxzyTIWqeBoPNJ4uSO8yyIplO9IoMxNN0Il1TGc xr+fzm9wjIz4kJFKSYGxQg0HE/hfpEVQkWE5pe3YUQeap413Kb/vq7k95P7njp2TlcuOQT1GNGp 5iv+uMvHOlEvskRnjF2ONJnbob22LTwzLh/aP8XHrhETFHjgXh5Dhxu/d+WZykilXF3WgF+qUwf OUR7x1dlBKL9UgNgMbH/oZccyiLKo2YAdT3c1nXiYddIDX+ndxgW/7q43L/lwvU0OI5Q6SYhtr9 5NeGZFPJ/8zkL6/LKQaebYmnITh32lhGzYjbLbj2QiVIwtUZQV0VjQzg2F6WZ1qhuYEKmXJ3r1U g= X-Received: by 2002:a05:600c:198b:b0:499:49f3:77b1 with SMTP id 5b1f17b1804b1-4997842da36mr55977895e9.3.1786457595909; Tue, 11 Aug 2026 07:13:15 -0700 (PDT) X-Received: by 2002:a05:600c:198b:b0:499:49f3:77b1 with SMTP id 5b1f17b1804b1-4997842da36mr55977115e9.3.1786457595524; Tue, 11 Aug 2026 07:13:15 -0700 (PDT) Received: from [192.168.188.103] (ip239-44-231-195.pool-bba.aruba.it. [195.231.44.239]) by smtp.gmail.com with ESMTPSA id 5b1f17b1804b1-499793ce27bsm28512795e9.3.2026.08.11.07.13.13 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Tue, 11 Aug 2026 07:13:14 -0700 (PDT) Message-ID: <21d4d5ed-572f-4e82-818f-78b50155390f@redhat.com> Date: Tue, 11 Aug 2026 16:13:13 +0200 Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Subject: Re: [syzbot] [net?] WARNING in ipgre_xmit (2) To: Jason Xing Cc: syzbot , 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, syzkaller-bugs@googlegroups.com References: <6a6f9105.1aa927e4.17d4bf.001b.GAE@google.com> <6a721aed.9511d2ce.1fc5b9.0341.GAE@google.com> <94a00de5-6293-42bd-b7bc-5370ea16a3e3@redhat.com> From: Paolo Abeni Content-Language: en-US In-Reply-To: Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit On 8/11/26 3:13 PM, Jason Xing wrote: > On Mon, Aug 10, 2026 at 6:54 PM Paolo Abeni wrote: >> On 8/9/26 8:03 AM, Jason Xing wrote: >>> On Wed, Aug 5, 2026 at 1:05 AM syzbot >>> wrote: >>>> >>>> syzbot has found a reproducer for the following issue on: >>>> >>>> HEAD commit: 848acc8ffe1b Merge tag 'fsverity-for-linus' of git://git.k.. >>>> git tree: upstream >>>> console+strace: https://syzkaller.appspot.com/x/log.txt?x=178fb649580000 >>>> kernel config: https://syzkaller.appspot.com/x/.config?x=4e38b15c29e6a1d9 >>>> 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 >>>> syz repro: https://syzkaller.appspot.com/x/repro.syz?x=1617be32580000 >>>> C reproducer: https://syzkaller.appspot.com/x/repro.c?x=11d113b9580000 >>>> >>>> Downloadable assets: >>>> disk image: https://storage.googleapis.com/syzbot-assets/4949138dcfef/disk-848acc8f.raw.xz >>>> vmlinux: https://storage.googleapis.com/syzbot-assets/31cc6fbe5b8a/vmlinux-848acc8f.xz >>>> kernel image: https://storage.googleapis.com/syzbot-assets/433919ca6520/bzImage-848acc8f.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#1: syz-executor147/5638 >>>> WARNING: ./include/linux/skbuff.h:2864 at pskb_network_may_pull_reason include/linux/skbuff.h:3265 [inline], CPU#1: syz-executor147/5638 >>>> WARNING: ./include/linux/skbuff.h:2864 at pskb_inet_may_pull_reason include/net/ip_tunnels.h:481 [inline], CPU#1: syz-executor147/5638 >>>> WARNING: ./include/linux/skbuff.h:2864 at pskb_inet_may_pull include/net/ip_tunnels.h:486 [inline], CPU#1: syz-executor147/5638 >>>> WARNING: ./include/linux/skbuff.h:2864 at ipgre_xmit+0x958/0xcd0 net/ipv4/ip_gre.c:658, CPU#1: syz-executor147/5638 >>>> Modules linked in: >>>> CPU: 1 UID: 0 PID: 5638 Comm: syz-executor147 Not tainted syzkaller #0 PREEMPT(full) >>>> Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/24/2026 >>>> 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 1a 78 01 cc e8 09 f5 6a f7 90 <0f> 0b 90 e9 08 f8 ff ff 44 89 ff 44 89 e6 e8 b5 f6 6a f7 45 39 e7 >>>> RSP: 0018:ffffc900039af5e0 EFLAGS: 00010293 >>>> RAX: ffffffff8a5c1d67 RBX: 0000000000000000 RCX: ffff888079535d00 >>>> RDX: 0000000000000000 RSI: 00000000ffffff40 RDI: 0000000000000000 >>>> RBP: ffffc900039af6b0 R08: ffff888079535d00 R09: 0000000000000002 >>>> R10: 0000000000004888 R11: ffffffff8a5c1410 R12: ffff88807ecbc000 >>>> R13: dffffc0000000000 R14: ffff88807b7f2780 R15: 00000000ffffff40 >>>> FS: 0000555590a0a400(0000) GS:ffff88812504b000(0000) knlGS:0000000000000000 >>>> CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 >>>> CR2: 000055704428ded0 CR3: 00000000788f2000 CR4: 00000000003526f0 >>>> 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:1253 [inline] >>>> xsk_generic_xmit+0x2759/0x47b0 net/xdp/xsk.c:1309 >>>> __xsk_sendmsg net/xdp/xsk.c:1363 [inline] >>>> xsk_sendmsg+0x482/0x810 net/xdp/xsk.c:1373 >>>> 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: 0033:0x7fc137b1b409 >>>> Code: c0 79 93 eb d5 48 8d 7c 1d 00 eb 99 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 d8 ff ff ff f7 d8 64 89 01 48 >>>> RSP: 002b:00007fffc9ef46d8 EFLAGS: 00000246 ORIG_RAX: 000000000000002e >>>> RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 00007fc137b1b409 >>>> RDX: 0000000000000040 RSI: 0000200000000700 RDI: 0000000000000003 >>>> RBP: 0000000000000000 R08: 0000000080000000 R09: 0000000080000000 >>>> R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 >>>> R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000000003 >>>> >>>> >>>> >>>> --- >>>> If you want syzbot to run the reproducer, reply with: >>>> #syz test: git://repo/address.git branch-or-commit-hash >>>> If you attach or paste a git patch, syzbot will apply it before testing. >>>> >>> >>> Please try this one instead. I'm not sure if the previous patch has >>> the index problem... >>> >>> But the following patch can be applied in my tree. >>> >>> #syz test >> >> Please, do not cc the netdev ML for syzbot test patches. They may foul >> PW and the KCI. > > I see. Sorry for that. > > But one more thing I have to ask is why the second attempt failed > since I see no output from syzbot. ? I read: """ failed to apply patch: error: corrupt patch at line 6 """ in last message from syzbot, and a similar one in reply to the previous attempt. You can use git format/git send-email even for syzbot tests, to avoid this kind of problems /P