* [moderation/CI] Re: net: nsh: handle nested NSH headers during GSO
@ 2026-04-20 8:08 syzbot ci
2026-04-20 8:11 ` Pimyn Girgis
0 siblings, 1 reply; 2+ messages in thread
From: syzbot ci @ 2026-04-20 8:08 UTC (permalink / raw)
To: syzkaller-upstream-moderation; +Cc: syzbot
syzbot ci has tested the following series
[v1] net: nsh: handle nested NSH headers during GSO
https://lore.kernel.org/all/6112cce99b4e3571444a616d0fb19e91e2fcca72.1776597598.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~exp1~20251221153213.50), Debian LLD 21.1.8
config: https://ci.syzbot.org/builds/193058cd-cd88-4bb0-a6e6-b43b6179fcd9/config
syz repro: https://ci.syzbot.org/findings/446db72d-a630-471c-b369-2ef1f7b3b6ed/syz_repro
------------[ cut here ]------------
offset != (typeof(skb->mac_header))offset
WARNING: ./include/linux/skbuff.h:3173 at skb_reset_mac_header include/linux/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(full)
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 fd 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:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000200000010000 CR3: 0000000170f06000 CR4: 00000000000006f0
Call Trace:
<TASK>
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 ff 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
</TASK>
***
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 n05ec@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
^ permalink raw reply [flat|nested] 2+ messages in thread
* Re: [moderation/CI] Re: net: nsh: handle nested NSH headers during GSO
2026-04-20 8:08 [moderation/CI] Re: net: nsh: handle nested NSH headers during GSO syzbot ci
@ 2026-04-20 8:11 ` Pimyn Girgis
0 siblings, 0 replies; 2+ messages in thread
From: Pimyn Girgis @ 2026-04-20 8:11 UTC (permalink / raw)
To: syzbot ci; +Cc: syzkaller-upstream-moderation, syzbot
#syz upstream
On Mon, Apr 20, 2026 at 10:08 AM syzbot ci
<syzbot+cicccda4cae0d53a4d@syzkaller.appspotmail.com> wrote:
>
> syzbot ci has tested the following series
>
> [v1] net: nsh: handle nested NSH headers during GSO
> https://lore.kernel.org/all/6112cce99b4e3571444a616d0fb19e91e2fcca72.1776597598.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~exp1~20251221153213.50), Debian LLD 21.1.8
> config: https://ci.syzbot.org/builds/193058cd-cd88-4bb0-a6e6-b43b6179fcd9/config
> syz repro: https://ci.syzbot.org/findings/446db72d-a630-471c-b369-2ef1f7b3b6ed/syz_repro
>
> ------------[ cut here ]------------
> offset != (typeof(skb->mac_header))offset
> WARNING: ./include/linux/skbuff.h:3173 at skb_reset_mac_header include/linux/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(full)
> 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 fd 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:0000000000000000
> CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
> CR2: 0000200000010000 CR3: 0000000170f06000 CR4: 00000000000006f0
> Call Trace:
> <TASK>
> 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 ff 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
> </TASK>
>
>
> ***
>
> 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 n05ec@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
>
> --
> You received this message because you are subscribed to the Google Groups "syzkaller-upstream-moderation" group.
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2026-04-20 8:08 [moderation/CI] Re: net: nsh: handle nested NSH headers during GSO syzbot ci
2026-04-20 8:11 ` Pimyn Girgis
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