------------[ cut here ]------------ kernel BUG at include/linux/skbuff.h:2233! invalid opcode: 0000 [#1] PREEMPT SMP KASAN CPU: 1 PID: 12084 Comm: syz-executor.1 Not tainted 5.3.0-rc4-next-20190816 #67 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 RIP: 0010:__skb_pull include/linux/skbuff.h:2233 [inline] RIP: 0010:__skb_pull include/linux/skbuff.h:2230 [inline] RIP: 0010:skb_pull_inline include/linux/skbuff.h:2239 [inline] RIP: 0010:skb_pull+0xea/0x110 net/core/skbuff.c:1902 Code: 9d c8 00 00 00 49 89 dc 49 89 9d c8 00 00 00 e8 7c dc da fb 4c 89 e0 5b 41 5c 41 5d 41 5e 5d c3 45 31 e4 eb ea e8 66 dc da fb <0f> 0b e8 6f b9 15 fc e9 44 ff ff ff e8 65 b9 15 fc eb 8a e8 7e b9 RSP: 0018:ffff8880610dee50 EFLAGS: 00010216 RAX: 0000000000040000 RBX: 0000000000000004 RCX: ffffc9000834f000 RDX: 0000000000008aab RSI: ffffffff8597541a RDI: 0000000000000004 RBP: ffff8880610dee70 R08: ffff888059ed4180 R09: fffffbfff14ee933 R10: fffffbfff14ee932 R11: ffffffff8a774997 R12: 00000000991efe0c R13: ffff8880610df4c0 R14: 00000000ffff8880 R15: ffff8880610df4c0 FS: 00007f8c79b65700(0000) GS:ffff8880ae900000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007f8c79b43db8 CR3: 00000000a7a4b000 CR4: 00000000001406e0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: sctp_inq_pop+0x2f1/0xd80 net/sctp/inqueue.c:202 sctp_endpoint_bh_rcv+0x184/0x8d0 net/sctp/endpointola.c:385 sctp_inq_push+0x1e4/0x280 net/sctp/inqueue.c:80 sctp_rcv+0x2807/0x3590 net/sctp/input.c:256 sctp6_rcv+0x17/0x30 net/sctp/ipv6.c:1049 ip6_protocol_deliver_rcu+0x2fe/0x1660 net/ipv6/ip6_input.c:397 ip6_input_finish+0x84/0x170 net/ipv6/ip6_input.c:438 NF_HOOK include/linux/netfilter.h:305 [inline] NF_HOOK include/linux/netfilter.h:299 [inline] ip6_input+0xe4/0x3f0 net/ipv6/ip6_input.c:447 dst_input include/net/dst.h:442 [inline] ip6_sublist_rcv_finish+0x98/0x1e0 net/ipv6/ip6_input.c:84 ip6_list_rcv_finish net/ipv6/ip6_input.c:118 [inline] ip6_sublist_rcv+0x80c/0xcf0 net/ipv6/ip6_input.c:282 ipv6_list_rcv+0x373/0x4b0 net/ipv6/ip6_input.c:316 __netif_receive_skb_list_ptype net/core/dev.c:5049 [inline] __netif_receive_skb_list_core+0x1a2/0x9d0 net/core/dev.c:5087 __netif_receive_skb_list net/core/dev.c:5149 [inline] netif_receive_skb_list_internal+0x7eb/0xe60 net/core/dev.c:5244 gro_normal_list.part.0+0x1e/0xb0 net/core/dev.c:5757 gro_normal_list net/core/dev.c:5755 [inline] gro_normal_one net/core/dev.c:5769 [inline] napi_frags_finish net/core/dev.c:5782 [inline] napi_gro_frags+0xa6a/0xea0 net/core/dev.c:5855 tun_get_user+0x2e98/0x3fa0 drivers/net/tun.c:1974 tun_chr_write_iter+0xbd/0x156 drivers/net/tun.c:2020 call_write_iter include/linux/fs.h:1885 [inline] do_iter_readv_writev+0x5f8/0x8f0 fs/read_write.c:693 do_iter_write fs/read_write.c:976 [inline] do_iter_write+0x17b/0x380 fs/read_write.c:957 vfs_writev+0x1b3/0x2f0 fs/read_write.c:1021 do_writev+0x15b/0x330 fs/read_write.c:1064 __do_sys_writev fs/read_write.c:1137 [inline] __se_sys_writev fs/read_write.c:1134 [inline] __x64_sys_writev+0x75/0xb0 fs/read_write.c:1134 do_syscall_64+0xfa/0x760 arch/x86/entry/common.c:290 entry_SYSCALL_64_after_hwframe+0x49/0xbe RIP: 0033:0x4596e1 Code: 75 14 b8 14 00 00 00 0f 05 48 3d 01 f0 ff ff 0f 83 34 b9 fb ff c3 48 83 ec 08 e8 fa 2c 00 00 48 89 04 24 b8 14 00 00 00 0f 05 <48> 8b 3c 24 48 89 c2 e8 43 2d 00 00 48 89 d0 48 83 c4 08 48 3d 01 RSP: 002b:00007f8c79b64ba0 EFLAGS: 00000293 ORIG_RAX: 0000000000000014 RAX: ffffffffffffffda RBX: 000000000000002a RCX: 00000000004596e1 RDX: 0000000000000001 RSI: 00007f8c79b64c00 RDI: 00000000000000f0 RBP: 000000000075bfc8 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000003 R11: 0000000000000293 R12: 00007f8c79b656d4 R13: 00000000004c8783 R14: 00000000004df5a0 R15: 00000000ffffffff Modules linked in: ---[ end trace d90e5f4db77147ae ]--- RIP: 0010:__skb_pull include/linux/skbuff.h:2233 [inline] RIP: 0010:__skb_pull include/linux/skbuff.h:2230 [inline] RIP: 0010:skb_pull_inline include/linux/skbuff.h:2239 [inline] RIP: 0010:skb_pull+0xea/0x110 net/core/skbuff.c:1902 Code: 9d c8 00 00 00 49 89 dc 49 89 9d c8 00 00 00 e8 7c dc da fb 4c 89 e0 5b 41 5c 41 5d 41 5e 5d c3 45 31 e4 eb ea e8 66 dc da fb <0f> 0b e8 6f b9 15 fc e9 44 ff ff ff e8 65 b9 15 fc eb 8a e8 7e b9 RSP: 0018:ffff8880610dee50 EFLAGS: 00010216 RAX: 0000000000040000 RBX: 0000000000000004 RCX: ffffc9000834f000 RDX: 0000000000008aab RSI: ffffffff8597541a RDI: 0000000000000004 RBP: ffff8880610dee70 R08: ffff888059ed4180 R09: fffffbfff14ee933 R10: fffffbfff14ee932 R11: ffffffff8a774997 R12: 00000000991efe0c R13: ffff8880610df4c0 R14: 00000000ffff8880 R15: ffff8880610df4c0 FS: 00007f8c79b65700(0000) GS:ffff8880ae900000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007f8c79b43db8 CR3: 00000000a7a4b000 CR4: 00000000001406e0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400