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From: syzbot ci To: alvaro.karsz@solid-run.com, andrew@lunn.ch, davem@davemloft.net, edumazet@google.com, eperezma@redhat.com, hengqi@linux.alibaba.com, jasowang@redhat.com, jiri@resnulli.us, kuba@kernel.org, mst@redhat.com, netdev@vger.kernel.org, pabeni@redhat.com, virtualization@lists.linux.dev, willemb@google.com, xuanzhuo@linux.alibaba.com Cc: syzbot@lists.linux.dev, syzkaller-bugs@googlegroups.com Content-Type: text/plain; charset="UTF-8" syzbot ci has tested the following series [v1] fixes two virtio-net related bugs. https://lore.kernel.org/all/20250925022537.91774-1-xuanzhuo@linux.alibaba.com * [PATCH net 1/2] virtio-net: fix incorrect flags recording in big mode * [PATCH net 2/2] virtio-net: correct hdr_len handling for VIRTIO_NET_F_GUEST_HDRLEN and found the following issue: WARNING in virtio_net_hdr_from_skb Full report is available here: https://ci.syzbot.org/series/41a78b3d-b982-4507-b02f-1991c8d827c9 *** WARNING in virtio_net_hdr_from_skb tree: net URL: https://kernel.googlesource.com/pub/scm/linux/kernel/git/netdev/net.git base: f8b4687151021db61841af983f1cb7be6915d4ef arch: amd64 compiler: Debian clang version 20.1.8 (++20250708063551+0c9f909b7976-1~exp1~20250708183702.136), Debian LLD 20.1.8 config: https://ci.syzbot.org/builds/bb3f28da-9370-44d7-be20-9c443d5ebfc9/config C repro: https://ci.syzbot.org/findings/7af48589-24a5-4e09-bfe0-1969f5d98f4d/c_repro syz repro: https://ci.syzbot.org/findings/7af48589-24a5-4e09-bfe0-1969f5d98f4d/syz_repro syz.0.17 uses obsolete (PF_INET,SOCK_PACKET) ------------[ cut here ]------------ WARNING: CPU: 0 PID: 6010 at ./include/linux/skbuff.h:3024 skb_transport_header include/linux/skbuff.h:3024 [inline] WARNING: CPU: 0 PID: 6010 at ./include/linux/skbuff.h:3024 skb_transport_offset include/linux/skbuff.h:3175 [inline] WARNING: CPU: 0 PID: 6010 at ./include/linux/skbuff.h:3024 virtio_net_hdr_from_skb+0x669/0xa30 include/linux/virtio_net.h:222 Modules linked in: CPU: 0 UID: 0 PID: 6010 Comm: syz.0.17 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_transport_header include/linux/skbuff.h:3024 [inline] RIP: 0010:skb_transport_offset include/linux/skbuff.h:3175 [inline] RIP: 0010:virtio_net_hdr_from_skb+0x669/0xa30 include/linux/virtio_net.h:222 Code: 00 00 00 fc ff df 0f b6 04 10 84 c0 0f 85 b0 03 00 00 41 c6 45 00 05 48 8b 74 24 08 83 c6 08 e9 ca fd ff ff e8 c8 1c 72 f7 90 <0f> 0b 90 e9 a7 fa ff ff e8 ba 1c 72 f7 90 0f 0b 90 e9 62 fc ff ff RSP: 0018:ffffc90002def490 EFLAGS: 00010293 RAX: ffffffff8a4da238 RBX: 1ffff11004dafca6 RCX: ffff888023c9b980 RDX: 0000000000000000 RSI: 000000000000ffff RDI: 000000000000ffff RBP: 1ffff1100537cbd8 R08: ffff88804138e059 R09: 0000000000000000 R10: ffff88804138e050 R11: ffffed1008271c0c R12: ffff888029be4000 R13: ffff888026d7e536 R14: ffff888029be5ec4 R15: 000000000000ffff FS: 0000555557e59500(0000) GS:ffff8880b8615000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 0000200000003000 CR3: 00000000414a0000 CR4: 00000000000006f0 Call Trace: tpacket_rcv+0x15c8/0x3290 net/packet/af_packet.c:2416 __netif_receive_skb_one_core net/core/dev.c:5991 [inline] __netif_receive_skb+0x164/0x380 net/core/dev.c:6104 netif_receive_skb_internal net/core/dev.c:6190 [inline] netif_receive_skb+0x1cb/0x790 net/core/dev.c:6249 tun_rx_batched+0x1b9/0x730 drivers/net/tun.c:1485 tun_get_user+0x2aa2/0x3e20 drivers/net/tun.c:1950 tun_chr_write_iter+0x113/0x200 drivers/net/tun.c:1996 new_sync_write fs/read_write.c:593 [inline] vfs_write+0x5c9/0xb30 fs/read_write.c:686 ksys_write+0x145/0x250 fs/read_write.c:738 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: 0033:0x7fe74f78ec29 Code: ff ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 40 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 a8 ff ff ff f7 d8 64 89 01 48 RSP: 002b:00007fffd7d9aa28 EFLAGS: 00000246 ORIG_RAX: 0000000000000001 RAX: ffffffffffffffda RBX: 00007fe74f9d5fa0 RCX: 00007fe74f78ec29 RDX: 0000000000000fb5 RSI: 0000200000002780 RDI: 0000000000000004 RBP: 00007fe74f811e41 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 00007fe74f9d5fa0 R14: 00007fe74f9d5fa0 R15: 0000000000000003 *** 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.