WARNING in set_ipv6_addr

Status: upstream: reported C repro on 2026/09/30 17:02
Subsystems: openvswitch
[Documentation on labels]
Reported-by: syzbot+4cc63fcfb3845e149969@syzkaller.appspotmail.com
First crash: 4h38m, last: 2h56m
▶ ▼ Discussions (1)
Title Replies (including bot) Last reply
[syzbot] [openvswitch?] WARNING in set_ipv6_addr 0 (1) 2026/09/30 17:02
▶ ▼ Cause bisection attempts (1)
Created Duration User Patch Repo Result
2026/09/30 16:18 bisect net-next running

Sample crash report:
ovs-dp0: entered promiscuous mode
------------[ cut here ]------------
!skb_transport_header_was_set(skb)
WARNING: ./include/linux/skbuff.h:3075 at skb_transport_header include/linux/skbuff.h:3075 [inline], CPU#1: syz-executor463/5635
WARNING: ./include/linux/skbuff.h:3075 at skb_transport_offset include/linux/skbuff.h:3250 [inline], CPU#1: syz-executor463/5635
WARNING: ./include/linux/skbuff.h:3075 at update_ipv6_checksum net/openvswitch/actions.c:361 [inline], CPU#1: syz-executor463/5635
WARNING: ./include/linux/skbuff.h:3075 at set_ipv6_addr+0x462/0x660 net/openvswitch/actions.c:399, CPU#1: syz-executor463/5635
Modules linked in:
CPU: 1 UID: 0 PID: 5635 Comm: syz-executor463 Not tainted syzkaller #0 PREEMPT(full) 
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/24/2026
RIP: 0010:skb_transport_header include/linux/skbuff.h:3075 [inline]
RIP: 0010:skb_transport_offset include/linux/skbuff.h:3250 [inline]
RIP: 0010:update_ipv6_checksum net/openvswitch/actions.c:361 [inline]
RIP: 0010:set_ipv6_addr+0x462/0x660 net/openvswitch/actions.c:399
Code: f6 e8 12 d3 05 00 ba 10 00 00 00 4c 89 ef 48 89 ee 48 83 c4 20 5b 41 5c 41 5d 41 5e 41 5f 5d e9 14 89 7a f6 e8 ff 80 0a f6 90 <0f> 0b 90 48 8b 44 24 10 42 0f b6 04 30 84 c0 0f 85 c8 01 00 00 41
RSP: 0018:ffffc90003b3ee68 EFLAGS: 00010293
RAX: ffffffff8bbd5b01 RBX: 000000000000ffff RCX: ffff8880780bbe80
RDX: 0000000000000000 RSI: 000000000000ffff RDI: 000000000000ffff
RBP: 000000000000004c R08: 0000000000000001 R09: 0000000000000011
R10: 000000000000001f R11: 0000000000000000 R12: ffff888071cdbd36
R13: ffff88802d028396 R14: dffffc0000000000 R15: ffff888071cdbc80
FS:  0000555579c36400(0000) GS:ffff888124dc5000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007ffd90696af0 CR3: 000000007065a000 CR4: 00000000003526f0
Call Trace:
 <TASK>
 set_ipv6 net/openvswitch/actions.c:531 [inline]
 execute_masked_set_action net/openvswitch/actions.c:1073 [inline]
 do_execute_actions+0x557e/0x8600 net/openvswitch/actions.c:1366
 ovs_execute_actions+0xde/0x520 net/openvswitch/actions.c:1592
 ovs_packet_cmd_execute+0xb4f/0xf10 net/openvswitch/datapath.c:705
 genl_family_rcv_msg_doit+0x233/0x340 net/netlink/genetlink.c:1114
 genl_family_rcv_msg net/netlink/genetlink.c:1194 [inline]
 genl_rcv_msg+0x614/0x7a0 net/netlink/genetlink.c:1209
 netlink_rcv_skb+0x226/0x4a0 net/netlink/af_netlink.c:2572
 genl_rcv+0x28/0x40 net/netlink/genetlink.c:1218
 netlink_unicast_kernel net/netlink/af_netlink.c:1335 [inline]
 netlink_unicast+0x7bd/0x940 net/netlink/af_netlink.c:1361
 netlink_sendmsg+0x813/0xb40 net/netlink/af_netlink.c:1916
 sock_sendmsg_nosec+0x14e/0x190 net/socket.c:800
 __sock_sendmsg net/socket.c:818 [inline]
 ____sys_sendmsg+0x54e/0x850 net/socket.c:2715
 ___sys_sendmsg+0x2a5/0x360 net/socket.c:2769
 __sys_sendmsg net/socket.c:2801 [inline]
 __do_sys_sendmsg net/socket.c:2806 [inline]
 __se_sys_sendmsg net/socket.c:2804 [inline]
 __x64_sys_sendmsg+0x1b1/0x290 net/socket.c:2804
 do_syscall_x64 arch/x86/entry/syscall_64.c:61 [inline]
 do_syscall_64+0x166/0x520 arch/x86/entry/syscall_64.c:84
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7fe073a4fd39
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:00007ffece969af8 EFLAGS: 00000246 ORIG_RAX: 000000000000002e
RAX: ffffffffffffffda RBX: 00007ffece969c28 RCX: 00007fe073a4fd39
RDX: 0000000000000000 RSI: 0000200000000040 RDI: 0000000000000003
RBP: 0000000000000001 R08: 00007ffece969c28 R09: 00007ffece969c28
R10: 0000000000000000 R11: 0000000000000246 R12: 00007ffece969c18
R13: 0000000000000002 R14: 00007fe073ae0ca0 R15: 0000000000000002
 </TASK>

Crashes (4):
Time Kernel Commit Syzkaller Config Log Report Syz repro C repro VM info Assets (help?) Manager Title
2026/09/30 15:59 net-next 47a144672573 892a21ec .config strace log report syz / log C [disk image] [vmlinux] [kernel image] ci-upstream-net-kasan-gce WARNING in set_ipv6_addr
2026/09/30 15:36 bpf-next 99c3e74f8d96 892a21ec .config strace log report syz / log C [disk image] [vmlinux] [kernel image] ci-upstream-bpf-next-kasan-gce WARNING in set_ipv6_addr
2026/09/30 14:55 net-next 47a144672573 892a21ec .config strace log report syz / log C [disk image] [vmlinux] [kernel image] ci-upstream-net-kasan-gce WARNING in set_ipv6_addr
2026/09/30 14:18 net-next 47a144672573 892a21ec .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-net-kasan-gce WARNING in set_ipv6_addr
* Struck through repros no longer work on HEAD.