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[195.231.44.239]) by smtp.gmail.com with ESMTPSA id ffacd0b85a97d-48002145966sm31724597f8f.5.2026.08.10.03.53.57 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Mon, 10 Aug 2026 03:53:57 -0700 (PDT) Message-ID: <94a00de5-6293-42bd-b7bc-5370ea16a3e3@redhat.com> Date: Mon, 10 Aug 2026 12:53:56 +0200 Precedence: bulk X-Mailing-List: netdev@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 , syzbot Cc: 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> Content-Language: en-US From: Paolo Abeni In-Reply-To: Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit 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. Thanks, Paolo