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AHgh+RqP46jKB70+JLteXFuj+Pf85vH0Jj6YA2ZhxeYX3U218s2SiDoCA6jVxOVhdgekZn4Fo8hsjrTYGt4e2ts=@vger.kernel.org X-Gm-Message-State: AOJu0Yy0YFjHZYa29RhmqdyAyo4HV5qB1p4MJB7c4YBtwwqaj6OrBve+ qXI8iuFL9V0qFOE4pKOHNZ+YyXmrwoCXHnonwiydQDE+JoSYkjuot3fNrSmHIp+E8vpirEDJcgM Rxv2E4vNNetqCWZVRin0nxp1J2kRia6j4nHF0GKvQ5EIEyaJtcrdw14nHRpE= Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 X-Received: by 2002:a4a:e844:0:b0:6aa:e854:d03b with SMTP id 006d021491bc7-6ae96bb2dc0mr235720eaf.2.1785862893651; Tue, 04 Aug 2026 10:01:33 -0700 (PDT) Date: Tue, 04 Aug 2026 10:01:33 -0700 In-Reply-To: <6a6f9105.1aa927e4.17d4bf.001b.GAE@google.com> X-Google-Appengine-App-Id: s~syzkaller X-Google-Appengine-App-Id-Alias: syzkaller Message-ID: <6a721aed.9511d2ce.1fc5b9.0341.GAE@google.com> Subject: Re: [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, kerneljasonxing@gmail.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" 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.