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Message-ID: <688a1a05.050a0220.5d226.0008.GAE@google.com>
Date: Wed, 30 Jul 2025 06:11:33 -0700
From: syzbot <syzbot+af43e647fd835acc02df@...kaller.appspotmail.com>
To: davem@...emloft.net, dsahern@...nel.org, edumazet@...gle.com,
horms@...nel.org, kuba@...nel.org, linux-kernel@...r.kernel.org,
netdev@...r.kernel.org, pabeni@...hat.com, syzkaller-bugs@...glegroups.com
Subject: [syzbot] [net?] WARNING in ipv6_gso_segment
Hello,
syzbot found the following issue on:
HEAD commit: 7abc678e3084 Merge tag 'pmdomain-v6.16-rc2' of git://git.k..
git tree: bpf
console+strace: https://syzkaller.appspot.com/x/log.txt?x=11cc0ca2580000
kernel config: https://syzkaller.appspot.com/x/.config?x=12b5044868deb866
dashboard link: https://syzkaller.appspot.com/bug?extid=af43e647fd835acc02df
compiler: Debian clang version 20.1.7 (++20250616065708+6146a88f6049-1~exp1~20250616065826.132), Debian LLD 20.1.7
syz repro: https://syzkaller.appspot.com/x/repro.syz?x=10480f82580000
C reproducer: https://syzkaller.appspot.com/x/repro.c?x=14248834580000
Downloadable assets:
disk image: https://storage.googleapis.com/syzbot-assets/8a9fc2a6bfdf/disk-7abc678e.raw.xz
vmlinux: https://storage.googleapis.com/syzbot-assets/29375cef95f6/vmlinux-7abc678e.xz
kernel image: https://storage.googleapis.com/syzbot-assets/8148ffc5b47b/bzImage-7abc678e.xz
IMPORTANT: if you fix the issue, please add the following tag to the commit:
Reported-by: syzbot+af43e647fd835acc02df@...kaller.appspotmail.com
------------[ cut here ]------------
WARNING: CPU: 1 PID: 5874 at ./include/linux/skbuff.h:3032 skb_reset_transport_header include/linux/skbuff.h:3032 [inline]
WARNING: CPU: 1 PID: 5874 at ./include/linux/skbuff.h:3032 ipv6_gso_segment+0x15e2/0x21e0 net/ipv6/ip6_offload.c:151
Modules linked in:
CPU: 1 UID: 0 PID: 5874 Comm: syz-executor410 Not tainted 6.16.0-rc6-syzkaller-g7abc678e3084 #0 PREEMPT(full)
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/12/2025
RIP: 0010:skb_reset_transport_header include/linux/skbuff.h:3032 [inline]
RIP: 0010:ipv6_gso_segment+0x15e2/0x21e0 net/ipv6/ip6_offload.c:151
Code: ff ff e8 f1 db 80 f7 49 c7 c5 a3 ff ff ff e9 27 fe ff ff e8 e0 db 80 f7 49 c7 c5 a3 ff ff ff e9 16 fe ff ff e8 cf db 80 f7 90 <0f> 0b 90 e9 71 f5 ff ff e8 c1 db 80 f7 e9 d3 00 00 00 e8 b7 db 80
RSP: 0018:ffffc90003faed00 EFLAGS: 00010293
RAX: ffffffff8a3f4d21 RBX: ffffffff8de66da0 RCX: ffff888030385a00
RDX: 0000000000000000 RSI: 00000000000100f4 RDI: 0000000000010000
RBP: ffffc90003faee30 R08: ffffea0001ff8240 R09: 0000013a000001a7
R10: ffffea0001ff8240 R11: 0000013a000001a7 R12: 1ffffffff1bccdb4
R13: ffff8880334eb280 R14: 00000000000100f4 R15: ffff8880334eb350
FS: 000055555a160380(0000) GS:ffff888125d23000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000200000010000 CR3: 000000007fe76000 CR4: 00000000003526f0
Call Trace:
<TASK>
skb_mac_gso_segment+0x31c/0x640 net/core/gso.c:53
nsh_gso_segment+0x54a/0xe10 net/nsh/nsh.c:110
skb_mac_gso_segment+0x31c/0x640 net/core/gso.c:53
__skb_gso_segment+0x342/0x510 net/core/gso.c:124
skb_gso_segment include/net/gso.h:83 [inline]
validate_xmit_skb+0x857/0x11b0 net/core/dev.c:3950
validate_xmit_skb_list+0x84/0x120 net/core/dev.c:4000
sch_direct_xmit+0xd3/0x4b0 net/sched/sch_generic.c:329
__dev_xmit_skb net/core/dev.c:4102 [inline]
__dev_queue_xmit+0x17b6/0x3a70 net/core/dev.c:4679
packet_snd net/packet/af_packet.c:3130 [inline]
packet_sendmsg+0x3e16/0x5060 net/packet/af_packet.c:3162
sock_sendmsg_nosec net/socket.c:712 [inline]
__sock_sendmsg+0x21c/0x270 net/socket.c:727
____sys_sendmsg+0x505/0x830 net/socket.c:2566
___sys_sendmsg+0x21f/0x2a0 net/socket.c:2620
__sys_sendmsg net/socket.c:2652 [inline]
__do_sys_sendmsg net/socket.c:2657 [inline]
__se_sys_sendmsg net/socket.c:2655 [inline]
__x64_sys_sendmsg+0x19b/0x260 net/socket.c:2655
do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
do_syscall_64+0xfa/0x3b0 arch/x86/entry/syscall_64.c:94
entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7ffb36bb8ea9
Code: 28 00 00 00 75 05 48 83 c4 28 c3 e8 01 1a 00 00 90 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 b8 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007fff4bae10a8 EFLAGS: 00000246 ORIG_RAX: 000000000000002e
RAX: ffffffffffffffda RBX: 0000000000000003 RCX: 00007ffb36bb8ea9
RDX: 00000000200400c4 RSI: 0000200000000180 RDI: 0000000000000003
RBP: 00000000000f4240 R08: 0000000000000001 R09: 0000000000000001
R10: 0000200000000180 R11: 0000000000000246 R12: 00007fff4bae1100
R13: 00007ffb36c063fe R14: 0000000000000003 R15: 00007fff4bae10e0
</TASK>
---
This report is generated by a bot. It may contain errors.
See https://goo.gl/tpsmEJ for more information about syzbot.
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If the report is already addressed, let syzbot know by replying with:
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