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Mon, 20 Apr 2026 01:08:38 -0700 (PDT) Date: Mon, 20 Apr 2026 01:08:38 -0700 X-Google-Appengine-App-Id: s~syzkaller X-Google-Appengine-App-Id-Alias: syzkaller Message-ID: <69e5df06.a00a0220.9259.0000.GAE@google.com> Subject: [moderation/CI] Re: net: nsh: handle nested NSH headers during GSO From: syzbot ci To: syzkaller-upstream-moderation@googlegroups.com Cc: syzbot@lists.linux.dev Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: quoted-printable syzbot ci has tested the following series [v1] net: nsh: handle nested NSH headers during GSO https://lore.kernel.org/all/6112cce99b4e3571444a616d0fb19e91e2fcca72.177659= 7598.git.caoruide123@gmail.com * [PATCH net 1/1] net: nsh: handle nested NSH headers during GSO and found the following issue: WARNING in nsh_gso_segment Full report is available here: https://ci.syzbot.org/series/13f77bac-014d-4059-9187-fbdbcb6a6540 *** WARNING in nsh_gso_segment tree: net URL: https://kernel.googlesource.com/pub/scm/linux/kernel/git/netdev/= net.git base: 0cf004ffb61cd32d140531c3a84afe975f9fc7ea arch: amd64 compiler: Debian clang version 21.1.8 (++20251221033036+2078da43e25a-1~exp= 1~20251221153213.50), Debian LLD 21.1.8 config: https://ci.syzbot.org/builds/193058cd-cd88-4bb0-a6e6-b43b6179fcd= 9/config syz repro: https://ci.syzbot.org/findings/446db72d-a630-471c-b369-2ef1f7b3b= 6ed/syz_repro ------------[ cut here ]------------ offset !=3D (typeof(skb->mac_header))offset WARNING: ./include/linux/skbuff.h:3173 at skb_reset_mac_header include/linu= x/skbuff.h:3173 [inline], CPU#1: syz.1.20/5978 WARNING: ./include/linux/skbuff.h:3173 at nsh_gso_segment+0x833/0x12d0 net/= nsh/nsh.c:107, CPU#1: syz.1.20/5978 Modules linked in: CPU: 1 UID: 0 PID: 5978 Comm: syz.1.20 Not tainted syzkaller #0 PREEMPT(ful= l)=20 Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.2-debian-1.16= .2-1 04/01/2014 RIP: 0010:skb_reset_mac_header include/linux/skbuff.h:3173 [inline] RIP: 0010:nsh_gso_segment+0x833/0x12d0 net/nsh/nsh.c:107 Code: 2f 08 00 00 48 8b 7c 24 60 44 89 f6 e8 46 83 e4 fd 48 85 c0 0f 84 20 = 08 00 00 e8 48 af 31 f6 e9 ab fb ff ff e8 3e af 31 f6 90 <0f> 0b 90 e9 43 f= d ff ff e8 30 af 31 f6 90 0f 0b 90 e9 39 fe ff ff RSP: 0018:ffffc90004847220 EFLAGS: 00010293 RAX: ffffffff8b93aeb2 RBX: ffff88817362a6d8 RCX: ffff88810f088000 RDX: 0000000000000000 RSI: 0000000000010040 RDI: 0000000000010000 RBP: ffffc90004847390 R08: ffff88810f088000 R09: 0000000000000005 R10: 0000000000000005 R11: 0000000000000000 R12: 0000000000000000 R13: 0000000000010040 R14: dffffc0000000000 R15: 0000000000000074 FS: 00007f28e9ed36c0(0000) GS:ffff8882a9245000(0000) knlGS:000000000000000= 0 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 0000200000010000 CR3: 0000000170f06000 CR4: 00000000000006f0 Call Trace: skb_mac_gso_segment+0x31c/0x690 net/core/gso.c:53 __skb_gso_segment+0x376/0x540 net/core/gso.c:124 skb_gso_segment include/net/gso.h:83 [inline] validate_xmit_skb+0xa21/0x14a0 net/core/dev.c:4039 validate_xmit_skb_list+0x84/0x120 net/core/dev.c:4089 sch_direct_xmit+0xdf/0x4c0 net/sched/sch_generic.c:357 __dev_xmit_skb net/core/dev.c:4209 [inline] __dev_queue_xmit+0x180f/0x3950 net/core/dev.c:4831 packet_snd net/packet/af_packet.c:3077 [inline] packet_sendmsg+0x3ebc/0x50f0 net/packet/af_packet.c:3109 sock_sendmsg_nosec net/socket.c:787 [inline] __sock_sendmsg net/socket.c:802 [inline] __sys_sendto+0x672/0x710 net/socket.c:2265 __do_sys_sendto net/socket.c:2272 [inline] __se_sys_sendto net/socket.c:2268 [inline] __x64_sys_sendto+0xde/0x100 net/socket.c:2268 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline] do_syscall_64+0x15f/0xf80 arch/x86/entry/syscall_64.c:94 entry_SYSCALL_64_after_hwframe+0x77/0x7f RIP: 0033:0x7f28e8f9c819 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 f= f 73 01 c3 48 c7 c1 e8 ff ff ff f7 d8 64 89 01 48 RSP: 002b:00007f28e9ed3028 EFLAGS: 00000246 ORIG_RAX: 000000000000002c RAX: ffffffffffffffda RBX: 00007f28e9216090 RCX: 00007f28e8f9c819 RDX: 00000000000100a6 RSI: 0000200000000180 RDI: 0000000000000005 RBP: 00007f28e9032c91 R08: 0000200000000140 R09: 0000000000000014 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 00007f28e9216128 R14: 00007f28e9216090 R15: 00007ffd50249d78 *** 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 patch for this bug, please reply with `#syz test` (should be on a separate line). The patch should be attached to the email. Note: arguments like custom git repos and branches are not supported. The email will later be sent to: [bird@lzu.edu.cn caoruide123@gmail.com davem@davemloft.net edumazet@google.= com horms@kernel.org jbenc@redhat.com kuba@kernel.org lx24@stu.ynu.edu.cn n= 05ec@lzu.edu.cn netdev@vger.kernel.org pabeni@redhat.com tomapufckgml@gmail= .com yifanwucs@gmail.com yuantan098@gmail.com] If the report looks fine to you, reply with: #syz upstream If the report is a false positive, reply with #syz invalid