netlink: 8 bytes leftover after parsing attributes in process `syz-executor6'.
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BUG: KMSAN: uninit-value in inet_gro_receive+0x1679/0x1980 net/ipv4/af_inet.c:1384
CPU: 1 PID: 14 Comm: ksoftirqd/1 Not tainted 4.16.0+ #87
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
Call Trace:
 __dump_stack lib/dump_stack.c:17 [inline]
 dump_stack+0x185/0x1d0 lib/dump_stack.c:53
 kmsan_report+0x142/0x240 mm/kmsan/kmsan.c:1067
 __msan_warning_32+0x6c/0xb0 mm/kmsan/kmsan_instr.c:683
 inet_gro_receive+0x1679/0x1980 net/ipv4/af_inet.c:1384
 dev_gro_receive+0x2154/0x3300 net/core/dev.c:4959
 napi_gro_receive+0x61f/0xb50 net/core/dev.c:5094
 gro_cell_poll+0x28e/0x410 net/core/gro_cells.c:46
 napi_poll net/core/dev.c:5705 [inline]
 net_rx_action+0x7c1/0x1a70 net/core/dev.c:5771
 __do_softirq+0x56d/0x93d kernel/softirq.c:285
 run_ksoftirqd+0x1f/0x40 kernel/softirq.c:666
 smpboot_thread_fn+0x488/0x970 kernel/smpboot.c:164
 kthread+0x539/0x720 kernel/kthread.c:239
 ret_from_fork+0x35/0x40 arch/x86/entry/entry_64.S:406

Uninit was stored to memory at:
 kmsan_save_stack_with_flags mm/kmsan/kmsan.c:278 [inline]
 kmsan_save_stack mm/kmsan/kmsan.c:293 [inline]
 kmsan_internal_chain_origin+0x12b/0x210 mm/kmsan/kmsan.c:684
 kmsan_memcpy_origins+0x11d/0x170 mm/kmsan/kmsan.c:526
 __msan_memcpy+0x109/0x160 mm/kmsan/kmsan_instr.c:477
 pskb_expand_head+0x3a6/0x1a70 net/core/skbuff.c:1467
 __pskb_pull_tail+0x1d7/0x2300 net/core/skbuff.c:1878
 __skb_linearize include/linux/skbuff.h:3025 [inline]
 skb_checksum_help+0x246/0xb60 net/core/dev.c:2659
 skb_csum_hwoffload_help net/core/dev.c:3076 [inline]
 validate_xmit_skb+0x10fe/0x1320 net/core/dev.c:3115
 __dev_queue_xmit+0x216a/0x3520 net/core/dev.c:3549
 dev_queue_xmit+0x4b/0x60 net/core/dev.c:3590
 neigh_hh_output include/net/neighbour.h:472 [inline]
 neigh_output include/net/neighbour.h:480 [inline]
 ip_finish_output2+0x12a1/0x1470 net/ipv4/ip_output.c:229
 ip_finish_output+0xcb2/0xff0 net/ipv4/ip_output.c:317
 NF_HOOK_COND include/linux/netfilter.h:277 [inline]
 ip_output+0x505/0x5d0 net/ipv4/ip_output.c:405
 dst_output include/net/dst.h:443 [inline]
 ip_local_out+0x15e/0x1d0 net/ipv4/ip_output.c:124
 iptunnel_xmit+0x850/0xdb0 net/ipv4/ip_tunnel_core.c:91
 ip_tunnel_xmit+0x30f3/0x37c0 net/ipv4/ip_tunnel.c:794
 ipip_tunnel_xmit+0x32b/0x4c0 net/ipv4/ipip.c:308
 __netdev_start_xmit include/linux/netdevice.h:4066 [inline]
 netdev_start_xmit include/linux/netdevice.h:4075 [inline]
 xmit_one net/core/dev.c:3026 [inline]
 dev_hard_start_xmit+0x5f1/0xc70 net/core/dev.c:3042
 __dev_queue_xmit+0x27ee/0x3520 net/core/dev.c:3557
 dev_queue_xmit+0x4b/0x60 net/core/dev.c:3590
 neigh_direct_output+0x42/0x50 net/core/neighbour.c:1390
 neigh_output include/net/neighbour.h:482 [inline]
 ip_finish_output2+0x1344/0x1470 net/ipv4/ip_output.c:229
 ip_finish_output+0xcb2/0xff0 net/ipv4/ip_output.c:317
 NF_HOOK_COND include/linux/netfilter.h:277 [inline]
 ip_output+0x505/0x5d0 net/ipv4/ip_output.c:405
 dst_output include/net/dst.h:443 [inline]
 ip_local_out net/ipv4/ip_output.c:124 [inline]
 ip_queue_xmit+0x1a1e/0x1d10 net/ipv4/ip_output.c:504
 tcp_transmit_skb+0x3d81/0x53d0 net/ipv4/tcp_output.c:1176
 tcp_write_xmit+0x3911/0xb920 net/ipv4/tcp_output.c:2394
 __tcp_push_pending_frames+0x124/0x3f0 net/ipv4/tcp_output.c:2567
 tcp_push+0x8b6/0x9c0 net/ipv4/tcp.c:726
 tcp_sendmsg_locked+0x5450/0x6cf0 net/ipv4/tcp.c:1426
 tcp_sendmsg+0xb2/0x100 net/ipv4/tcp.c:1463
 inet_sendmsg+0x48d/0x740 net/ipv4/af_inet.c:764
 sock_sendmsg_nosec net/socket.c:630 [inline]
 sock_sendmsg net/socket.c:640 [inline]
 SYSC_sendto+0x6c3/0x7e0 net/socket.c:1747
 SyS_sendto+0x8a/0xb0 net/socket.c:1715
 do_syscall_64+0x309/0x430 arch/x86/entry/common.c:287
 entry_SYSCALL_64_after_hwframe+0x3d/0xa2
Uninit was created at:
 kmsan_save_stack_with_flags mm/kmsan/kmsan.c:278 [inline]
 kmsan_internal_poison_shadow+0xb8/0x1b0 mm/kmsan/kmsan.c:188
 kmsan_kmalloc+0x94/0x100 mm/kmsan/kmsan.c:314
 kmsan_slab_alloc+0x11/0x20 mm/kmsan/kmsan.c:321
 slab_post_alloc_hook mm/slab.h:445 [inline]
 slab_alloc_node mm/slub.c:2737 [inline]
 __kmalloc_node_track_caller+0xaed/0x11c0 mm/slub.c:4369
 __kmalloc_reserve net/core/skbuff.c:138 [inline]
 __alloc_skb+0x2cf/0x9f0 net/core/skbuff.c:206
 alloc_skb_fclone include/linux/skbuff.h:1026 [inline]
 sk_stream_alloc_skb+0x17c/0xcf0 net/ipv4/tcp.c:866
 tcp_sendmsg_locked+0x2b36/0x6cf0 net/ipv4/tcp.c:1301
 tcp_sendmsg+0xb2/0x100 net/ipv4/tcp.c:1463
 inet_sendmsg+0x48d/0x740 net/ipv4/af_inet.c:764
 sock_sendmsg_nosec net/socket.c:630 [inline]
 sock_sendmsg net/socket.c:640 [inline]
 SYSC_sendto+0x6c3/0x7e0 net/socket.c:1747
 SyS_sendto+0x8a/0xb0 net/socket.c:1715
 do_syscall_64+0x309/0x430 arch/x86/entry/common.c:287
 entry_SYSCALL_64_after_hwframe+0x3d/0xa2
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