do_dccp_setsockopt: sockopt(CHANGE_L/R) is deprecated: fix your app
==================================================================
BUG: KMSAN: uninit-value in __arch_swab32 arch/x86/include/uapi/asm/swab.h:10 [inline]
BUG: KMSAN: uninit-value in __fswab32 include/uapi/linux/swab.h:59 [inline]
BUG: KMSAN: uninit-value in erspan_rcv net/ipv4/ip_gre.c:282 [inline]
BUG: KMSAN: uninit-value in gre_rcv+0x11a0/0x1900 net/ipv4/ip_gre.c:422
CPU: 0 PID: 25688 Comm: syz-executor1 Not tainted 4.20.0-rc7+ #12
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
Call Trace:
 <IRQ>
 __dump_stack lib/dump_stack.c:77 [inline]
 dump_stack+0x173/0x1d0 lib/dump_stack.c:113
 kmsan_report+0x12e/0x2a0 mm/kmsan/kmsan.c:611
 __msan_warning+0x81/0xf0 mm/kmsan/kmsan_instr.c:295
 __arch_swab32 arch/x86/include/uapi/asm/swab.h:10 [inline]
 __fswab32 include/uapi/linux/swab.h:59 [inline]
 erspan_rcv net/ipv4/ip_gre.c:282 [inline]
 gre_rcv+0x11a0/0x1900 net/ipv4/ip_gre.c:422
 gre_rcv+0x2e6/0x3c0 net/ipv4/gre_demux.c:143
 ip_local_deliver_finish+0x7a2/0xea0 net/ipv4/ip_input.c:215
 NF_HOOK include/linux/netfilter.h:289 [inline]
 ip_local_deliver+0x44b/0x510 net/ipv4/ip_input.c:256
 dst_input include/net/dst.h:450 [inline]
 ip_rcv_finish net/ipv4/ip_input.c:415 [inline]
 NF_HOOK include/linux/netfilter.h:289 [inline]
 ip_rcv+0x6b6/0x740 net/ipv4/ip_input.c:524
 __netif_receive_skb_one_core net/core/dev.c:4946 [inline]
 __netif_receive_skb net/core/dev.c:5056 [inline]
 process_backlog+0x766/0x10f0 net/core/dev.c:5864
 napi_poll net/core/dev.c:6287 [inline]
 net_rx_action+0x816/0x1aa0 net/core/dev.c:6353
 __do_softirq+0x53f/0x93a kernel/softirq.c:293
 do_softirq_own_stack+0x49/0x80 arch/x86/entry/entry_64.S:1039
 </IRQ>
 do_softirq kernel/softirq.c:338 [inline]
 __local_bh_enable_ip+0x16f/0x1a0 kernel/softirq.c:190
 local_bh_enable+0x36/0x40 include/linux/bottom_half.h:32
 rcu_read_unlock_bh include/linux/rcupdate.h:696 [inline]
 ip_finish_output2+0x1627/0x1830 net/ipv4/ip_output.c:231
 ip_finish_output+0xd2d/0xfd0 net/ipv4/ip_output.c:317
 NF_HOOK_COND include/linux/netfilter.h:278 [inline]
 ip_mc_output+0x117a/0x1700 net/ipv4/ip_output.c:390
 dst_output include/net/dst.h:444 [inline]
 ip_local_out net/ipv4/ip_output.c:124 [inline]
 ip_send_skb+0x179/0x360 net/ipv4/ip_output.c:1442
 udp_send_skb+0x1429/0x18e0 net/ipv4/udp.c:829
 udp_sendmsg+0x3aa4/0x40f0 net/ipv4/udp.c:1116
 inet_sendmsg+0x54a/0x720 net/ipv4/af_inet.c:798
 sock_sendmsg_nosec net/socket.c:621 [inline]
 sock_sendmsg net/socket.c:631 [inline]
 ___sys_sendmsg+0xdb9/0x11b0 net/socket.c:2116
 __sys_sendmmsg+0x570/0xa60 net/socket.c:2211
 __do_sys_sendmmsg net/socket.c:2240 [inline]
 __se_sys_sendmmsg+0xbd/0xe0 net/socket.c:2237
 __x64_sys_sendmmsg+0x56/0x70 net/socket.c:2237
 do_syscall_64+0xbc/0xf0 arch/x86/entry/common.c:291
 entry_SYSCALL_64_after_hwframe+0x63/0xe7
RIP: 0033:0x457669
Code: fd b3 fb ff c3 66 2e 0f 1f 84 00 00 00 00 00 66 90 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 0f 83 cb b3 fb ff c3 66 2e 0f 1f 84 00 00 00 00
RSP: 002b:00007fccb8d8cc78 EFLAGS: 00000246 ORIG_RAX: 0000000000000133
RAX: ffffffffffffffda RBX: 0000000000000004 RCX: 0000000000457669
RDX: 0000000000000001 RSI: 0000000020004e00 RDI: 0000000000000003
RBP: 000000000072bf00 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 00007fccb8d8d6d4
R13: 00000000004c3e4b R14: 00000000004d6ca8 R15: 00000000ffffffff

Uninit was stored to memory at:
 kmsan_save_stack_with_flags mm/kmsan/kmsan.c:202 [inline]
 kmsan_save_stack mm/kmsan/kmsan.c:217 [inline]
 kmsan_internal_chain_origin+0x134/0x230 mm/kmsan/kmsan.c:437
 kmsan_memcpy_memmove_metadata+0x58f/0xfa0 mm/kmsan/kmsan.c:314
 kmsan_memcpy_metadata+0xb/0x10 mm/kmsan/kmsan.c:335
 __msan_memcpy+0x61/0x70 mm/kmsan/kmsan_instr.c:133
 pskb_expand_head+0x34f/0x18f0 net/core/skbuff.c:1469
 __skb_cow include/linux/skbuff.h:2959 [inline]
 skb_cow_head include/linux/skbuff.h:2993 [inline]
 ip_tunnel_xmit+0x3510/0x3b90 net/ipv4/ip_tunnel.c:780
 __gre_xmit net/ipv4/ip_gre.c:451 [inline]
 erspan_xmit+0x2e96/0x3790 net/ipv4/ip_gre.c:749
 __netdev_start_xmit include/linux/netdevice.h:4356 [inline]
 netdev_start_xmit include/linux/netdevice.h:4365 [inline]
 xmit_one net/core/dev.c:3257 [inline]
 dev_hard_start_xmit+0x607/0xc40 net/core/dev.c:3273
 sch_direct_xmit+0x58a/0x880 net/sched/sch_generic.c:327
 qdisc_restart net/sched/sch_generic.c:390 [inline]
 __qdisc_run+0x1cea/0x34a0 net/sched/sch_generic.c:398
 qdisc_run include/net/pkt_sched.h:121 [inline]
 __dev_xmit_skb net/core/dev.c:3452 [inline]
 __dev_queue_xmit+0x2184/0x3bc0 net/core/dev.c:3811
 dev_queue_xmit+0x4b/0x60 net/core/dev.c:3876
 neigh_resolve_output+0xab7/0xb40 net/core/neighbour.c:1382
 neigh_output include/net/neighbour.h:502 [inline]
 ip_finish_output2+0x1611/0x1830 net/ipv4/ip_output.c:229
 ip_finish_output+0xd2d/0xfd0 net/ipv4/ip_output.c:317
 NF_HOOK_COND include/linux/netfilter.h:278 [inline]
 ip_mc_output+0x117a/0x1700 net/ipv4/ip_output.c:390
 dst_output include/net/dst.h:444 [inline]
 ip_local_out net/ipv4/ip_output.c:124 [inline]
 ip_send_skb+0x179/0x360 net/ipv4/ip_output.c:1442
 udp_send_skb+0x1429/0x18e0 net/ipv4/udp.c:829
 udp_sendmsg+0x3aa4/0x40f0 net/ipv4/udp.c:1116
 inet_sendmsg+0x54a/0x720 net/ipv4/af_inet.c:798
 sock_sendmsg_nosec net/socket.c:621 [inline]
 sock_sendmsg net/socket.c:631 [inline]
 ___sys_sendmsg+0xdb9/0x11b0 net/socket.c:2116
 __sys_sendmmsg+0x570/0xa60 net/socket.c:2211
 __do_sys_sendmmsg net/socket.c:2240 [inline]
 __se_sys_sendmmsg+0xbd/0xe0 net/socket.c:2237
 __x64_sys_sendmmsg+0x56/0x70 net/socket.c:2237
 do_syscall_64+0xbc/0xf0 arch/x86/entry/common.c:291
 entry_SYSCALL_64_after_hwframe+0x63/0xe7

Uninit was created at:
 kmsan_save_stack_with_flags mm/kmsan/kmsan.c:202 [inline]
 kmsan_internal_poison_shadow+0x92/0x150 mm/kmsan/kmsan.c:156
 kmsan_kmalloc+0xac/0x130 mm/kmsan/kmsan_hooks.c:176
 kmsan_slab_alloc+0xe/0x10 mm/kmsan/kmsan_hooks.c:185
 slab_post_alloc_hook mm/slab.h:446 [inline]
 slab_alloc_node mm/slub.c:2759 [inline]
 __kmalloc_node_track_caller+0xe38/0x1060 mm/slub.c:4383
 __kmalloc_reserve net/core/skbuff.c:137 [inline]
 __alloc_skb+0x309/0xa20 net/core/skbuff.c:205
 alloc_skb include/linux/skbuff.h:998 [inline]
 alloc_skb_with_frags+0x1c7/0xaf0 net/core/skbuff.c:5220
 sock_alloc_send_pskb+0xafd/0x10e0 net/core/sock.c:2083
 sock_alloc_send_skb+0xca/0xe0 net/core/sock.c:2100
 __ip_append_data+0x2c7c/0x4250 net/ipv4/ip_output.c:982
 ip_make_skb+0x392/0x890 net/ipv4/ip_output.c:1508
 udp_sendmsg+0x36df/0x40f0 net/ipv4/udp.c:1111
 inet_sendmsg+0x54a/0x720 net/ipv4/af_inet.c:798
 sock_sendmsg_nosec net/socket.c:621 [inline]
 sock_sendmsg net/socket.c:631 [inline]
 ___sys_sendmsg+0xdb9/0x11b0 net/socket.c:2116
 __sys_sendmmsg+0x570/0xa60 net/socket.c:2211
 __do_sys_sendmmsg net/socket.c:2240 [inline]
 __se_sys_sendmmsg+0xbd/0xe0 net/socket.c:2237
 __x64_sys_sendmmsg+0x56/0x70 net/socket.c:2237
 do_syscall_64+0xbc/0xf0 arch/x86/entry/common.c:291
 entry_SYSCALL_64_after_hwframe+0x63/0xe7
==================================================================