------------[ cut here ]------------ WARNING: CPU: 2 PID: 5902 at include/linux/skbuff.h:2850 skb_mac_header include/linux/skbuff.h:2850 [inline] WARNING: CPU: 2 PID: 5902 at include/linux/skbuff.h:2850 ip6erspan_tunnel_xmit+0x1d9c/0x2d90 net/ipv6/ip6_gre.c:962 Modules linked in: CPU: 2 PID: 5902 Comm: syz-executor.3 Not tainted 6.2.0-rc7-syzkaller-00216-gf339c2597ebb #0 Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.14.0-2 04/01/2014 RIP: 0010:skb_mac_header include/linux/skbuff.h:2850 [inline] RIP: 0010:ip6erspan_tunnel_xmit+0x1d9c/0x2d90 net/ipv6/ip6_gre.c:962 Code: 04 02 41 01 de 84 c0 74 08 3c 03 0f 8e 1c 0a 00 00 45 89 b4 24 c8 00 00 00 c6 85 77 fe ff ff 01 e9 e5 e6 ff ff e8 e4 ca d5 f8 <0f> 0b e9 68 e7 ff ff e8 d8 ca d5 f8 49 8d bf f0 0c 00 00 48 b8 00 RSP: 0018:ffffc90003097818 EFLAGS: 00010216 RAX: 00000000000004d5 RBX: 000000000000ffff RCX: ffffc9000c9e4000 RDX: 0000000000040000 RSI: ffffffff88ab2d2c RDI: 0000000000000003 RBP: ffffc900030979c0 R08: 0000000000000003 R09: 000000000000ffff R10: 000000000000ffff R11: 0000000000000000 R12: ffff88801e8fd400 R13: 00000000000000d0 R14: ffff88801a0fa8d0 R15: ffff88805624c000 FS: 0000000000000000(0000) GS:ffff88802c800000(0063) knlGS:00000000f7f24b40 CS: 0010 DS: 002b ES: 002b CR0: 0000000080050033 CR2: 000000002f226000 CR3: 00000000729bc000 CR4: 0000000000150ee0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: __netdev_start_xmit include/linux/netdevice.h:4865 [inline] netdev_start_xmit include/linux/netdevice.h:4879 [inline] __dev_direct_xmit+0x504/0x730 net/core/dev.c:4305 dev_direct_xmit include/linux/netdevice.h:3048 [inline] packet_direct_xmit+0x1b7/0x2c0 net/packet/af_packet.c:282 packet_snd net/packet/af_packet.c:3073 [inline] packet_sendmsg+0x334c/0x5500 net/packet/af_packet.c:3104 sock_sendmsg_nosec net/socket.c:714 [inline] sock_sendmsg+0xd3/0x120 net/socket.c:734 __sys_sendto+0x23a/0x340 net/socket.c:2117 __do_sys_sendto net/socket.c:2129 [inline] __se_sys_sendto net/socket.c:2125 [inline] __ia32_sys_sendto+0xdf/0x1b0 net/socket.c:2125 do_syscall_32_irqs_on arch/x86/entry/common.c:112 [inline] __do_fast_syscall_32+0x65/0xf0 arch/x86/entry/common.c:178 do_fast_syscall_32+0x33/0x70 arch/x86/entry/common.c:203 entry_SYSENTER_compat_after_hwframe+0x70/0x82 RIP: 0023:0xf7f4a549 Code: 03 74 c0 01 10 05 03 74 b8 01 10 06 03 74 b4 01 10 07 03 74 b0 01 10 08 03 74 d8 01 00 00 00 00 00 51 52 55 89 e5 0f 34 cd 80 <5d> 5a 59 c3 90 90 90 90 8d b4 26 00 00 00 00 8d b4 26 00 00 00 00 RSP: 002b:00000000f7f245cc EFLAGS: 00000296 ORIG_RAX: 0000000000000171 RAX: ffffffffffffffda RBX: 0000000000000003 RCX: 0000000000000000 RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000020000040 RBP: 0000000000000014 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000000000 ---------------- Code disassembly (best guess): 0: 03 74 c0 01 add 0x1(%rax,%rax,8),%esi 4: 10 05 03 74 b8 01 adc %al,0x1b87403(%rip) # 0x1b8740d a: 10 06 adc %al,(%rsi) c: 03 74 b4 01 add 0x1(%rsp,%rsi,4),%esi 10: 10 07 adc %al,(%rdi) 12: 03 74 b0 01 add 0x1(%rax,%rsi,4),%esi 16: 10 08 adc %cl,(%rax) 18: 03 74 d8 01 add 0x1(%rax,%rbx,8),%esi 1c: 00 00 add %al,(%rax) 1e: 00 00 add %al,(%rax) 20: 00 51 52 add %dl,0x52(%rcx) 23: 55 push %rbp 24: 89 e5 mov %esp,%ebp 26: 0f 34 sysenter 28: cd 80 int $0x80 * 2a: 5d pop %rbp <-- trapping instruction 2b: 5a pop %rdx 2c: 59 pop %rcx 2d: c3 retq 2e: 90 nop 2f: 90 nop 30: 90 nop 31: 90 nop 32: 8d b4 26 00 00 00 00 lea 0x0(%rsi,%riz,1),%esi 39: 8d b4 26 00 00 00 00 lea 0x0(%rsi,%riz,1),%esi