------------[ cut here ]------------ WARNING: CPU: 1 PID: 16122 at include/linux/skbuff.h:2911 skb_transport_header include/linux/skbuff.h:2911 [inline] WARNING: CPU: 1 PID: 16122 at include/linux/skbuff.h:2911 skb_transport_offset include/linux/skbuff.h:3018 [inline] WARNING: CPU: 1 PID: 16122 at include/linux/skbuff.h:2911 ipgre_xmit+0x894/0x970 net/ipv4/ip_gre.c:639 Modules linked in: CPU: 1 PID: 16122 Comm: syz-executor.5 Not tainted 5.19.0-rc1-syzkaller-00024-g6bfb56e93bce #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 RIP: 0010:skb_transport_header include/linux/skbuff.h:2911 [inline] RIP: 0010:skb_transport_offset include/linux/skbuff.h:3018 [inline] RIP: 0010:ipgre_xmit+0x894/0x970 net/ipv4/ip_gre.c:639 Code: 89 14 24 e8 4e 63 d0 f9 48 8b 14 24 e9 be f9 ff ff e8 60 63 d0 f9 e9 02 fa ff ff e8 46 63 d0 f9 e9 55 fa ff ff e8 ac 9f 83 f9 <0f> 0b e9 66 fa ff ff 48 8b 7c 24 08 e8 4b 63 d0 f9 e9 03 f8 ff ff RSP: 0018:ffffc9001544f530 EFLAGS: 00010212 RAX: 000000000000019f RBX: 000000000000ffff RCX: ffffc90005ac3000 RDX: 0000000000040000 RSI: ffffffff87f6d6c4 RDI: 0000000000000003 RBP: ffff8880763d23c0 R08: 0000000000000003 R09: 000000000000ffff R10: 000000000000ffff R11: 0000000000000001 R12: ffff88804b132000 R13: ffff8880763d2474 R14: 0000000000000004 R15: ffff88807cb26400 FS: 0000000000000000(0000) GS:ffff8880b9b00000(0063) knlGS:00000000f7fcbb40 CS: 0010 DS: 002b ES: 002b CR0: 0000000080050033 CR2: 0000000020000040 CR3: 000000001f7e6000 CR4: 00000000003526e0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: __netdev_start_xmit include/linux/netdevice.h:4805 [inline] netdev_start_xmit include/linux/netdevice.h:4819 [inline] xmit_one net/core/dev.c:3588 [inline] dev_hard_start_xmit+0x188/0x880 net/core/dev.c:3604 __dev_queue_xmit+0x2b1d/0x3900 net/core/dev.c:4253 packet_snd net/packet/af_packet.c:3073 [inline] packet_sendmsg+0x21cb/0x5550 net/packet/af_packet.c:3104 sock_sendmsg_nosec net/socket.c:714 [inline] sock_sendmsg+0xcf/0x120 net/socket.c:734 ____sys_sendmsg+0x334/0x810 net/socket.c:2492 ___sys_sendmsg+0xf3/0x170 net/socket.c:2546 __sys_sendmmsg+0x297/0x470 net/socket.c:2625 __compat_sys_sendmmsg net/compat.c:361 [inline] __do_compat_sys_sendmmsg net/compat.c:368 [inline] __se_compat_sys_sendmmsg net/compat.c:365 [inline] __ia32_compat_sys_sendmmsg+0x9b/0x100 net/compat.c:365 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+0x2f/0x70 arch/x86/entry/common.c:203 entry_SYSENTER_compat_after_hwframe+0x53/0x62 RIP: 0023:0xf7fd0549 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:00000000f7fcb5cc EFLAGS: 00000296 ORIG_RAX: 0000000000000159 RAX: ffffffffffffffda RBX: 0000000000000003 RCX: 0000000020001700 RDX: 0000000000000001 RSI: 0000000000000000 RDI: 0000000000000000 RBP: 0000000000000000 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