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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 gre_parse_header+0x1395/0x1690 net/ipv4/gre_demux.c:131
CPU: 1 PID: 16 Comm: ksoftirqd/1 Not tainted 5.2.0+ #14
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
Call Trace:
 __dump_stack lib/dump_stack.c:77 [inline]
 dump_stack+0x191/0x1f0 lib/dump_stack.c:113
 kmsan_report+0x162/0x2d0 mm/kmsan/kmsan_report.c:109
 __msan_warning+0x75/0xe0 mm/kmsan/kmsan_instr.c:294
 __arch_swab32 arch/x86/include/uapi/asm/swab.h:10 [inline]
 __fswab32 include/uapi/linux/swab.h:59 [inline]
 gre_parse_header+0x1395/0x1690 net/ipv4/gre_demux.c:131
 gre_rcv+0x1cb/0x1900 net/ipv4/ip_gre.c:409
 gre_rcv+0x2dd/0x3c0 net/ipv4/gre_demux.c:155
 ip_protocol_deliver_rcu+0x722/0xbc0 net/ipv4/ip_input.c:204
 ip_local_deliver_finish net/ipv4/ip_input.c:231 [inline]
 NF_HOOK include/linux/netfilter.h:305 [inline]
 ip_local_deliver+0x62a/0x7c0 net/ipv4/ip_input.c:252
 dst_input include/net/dst.h:439 [inline]
 ip_rcv_finish net/ipv4/ip_input.c:413 [inline]
 NF_HOOK include/linux/netfilter.h:305 [inline]
 ip_rcv+0x6c5/0x740 net/ipv4/ip_input.c:523
 __netif_receive_skb_one_core net/core/dev.c:5009 [inline]
 __netif_receive_skb net/core/dev.c:5123 [inline]
 process_backlog+0xef5/0x1410 net/core/dev.c:5934
 napi_poll net/core/dev.c:6357 [inline]
 net_rx_action+0x738/0x1940 net/core/dev.c:6423
 __do_softirq+0x4ad/0x858 kernel/softirq.c:293
 run_ksoftirqd+0x25/0x40 kernel/softirq.c:607
 smpboot_thread_fn+0x4be/0x9d0 kernel/smpboot.c:165
 kthread+0x4b5/0x4f0 kernel/kthread.c:256
 ret_from_fork+0x35/0x40 arch/x86/entry/entry_64.S:355

Uninit was stored to memory at:
 kmsan_save_stack_with_flags mm/kmsan/kmsan.c:187 [inline]
 kmsan_internal_chain_origin+0xcc/0x150 mm/kmsan/kmsan.c:345
 kmsan_memcpy_memmove_metadata+0x9f9/0xe00 mm/kmsan/kmsan.c:278
 kmsan_memcpy_metadata+0xb/0x10 mm/kmsan/kmsan.c:298
 __msan_memcpy+0x56/0x70 mm/kmsan/kmsan_instr.c:129
 pskb_expand_head+0x38a/0x19f0 net/core/skbuff.c:1510
 __skb_cow include/linux/skbuff.h:3036 [inline]
 skb_cow_head include/linux/skbuff.h:3070 [inline]
 ip_tunnel_xmit+0x2971/0x3320 net/ipv4/ip_tunnel.c:811
 __gre_xmit net/ipv4/ip_gre.c:444 [inline]
 erspan_xmit+0x1ef8/0x35c0 net/ipv4/ip_gre.c:679
 __netdev_start_xmit include/linux/netdevice.h:4406 [inline]
 netdev_start_xmit include/linux/netdevice.h:4420 [inline]
 xmit_one net/core/dev.c:3288 [inline]
 dev_hard_start_xmit+0x51a/0xab0 net/core/dev.c:3304
 sch_direct_xmit+0x56c/0x18c0 net/sched/sch_generic.c:309
 __dev_xmit_skb net/core/dev.c:3485 [inline]
 __dev_queue_xmit+0x1e53/0x4270 net/core/dev.c:3846
 dev_queue_xmit+0x4b/0x60 net/core/dev.c:3910
 neigh_resolve_output+0xab7/0xb50 net/core/neighbour.c:1486
 neigh_output include/net/neighbour.h:511 [inline]
 ip_finish_output2+0x1a8e/0x25d0 net/ipv4/ip_output.c:228
 ip_finish_output+0xd2a/0xfd0 net/ipv4/ip_output.c:315
 NF_HOOK_COND include/linux/netfilter.h:294 [inline]
 ip_output+0x541/0x610 net/ipv4/ip_output.c:415
 dst_output include/net/dst.h:433 [inline]
 ip_local_out net/ipv4/ip_output.c:125 [inline]
 ip_send_skb net/ipv4/ip_output.c:1473 [inline]
 ip_push_pending_frames+0x243/0x460 net/ipv4/ip_output.c:1493
 raw_sendmsg+0x2df8/0x46d0 net/ipv4/raw.c:672
 inet_sendmsg+0x48e/0x750 net/ipv4/af_inet.c:798
 sock_sendmsg_nosec net/socket.c:646 [inline]
 sock_sendmsg net/socket.c:665 [inline]
 ___sys_sendmsg+0xe92/0x13c0 net/socket.c:2286
 __sys_sendmsg net/socket.c:2324 [inline]
 __do_sys_sendmsg net/socket.c:2333 [inline]
 __se_sys_sendmsg+0x305/0x460 net/socket.c:2331
 __x64_sys_sendmsg+0x4a/0x70 net/socket.c:2331
 do_syscall_64+0xbc/0xf0 arch/x86/entry/common.c:302
 entry_SYSCALL_64_after_hwframe+0x63/0xe7

Uninit was created at:
 kmsan_save_stack_with_flags mm/kmsan/kmsan.c:187 [inline]
 kmsan_internal_poison_shadow+0x53/0xa0 mm/kmsan/kmsan.c:146
 kmsan_slab_alloc+0xaa/0x120 mm/kmsan/kmsan_hooks.c:175
 slab_alloc_node mm/slub.c:2773 [inline]
 __kmalloc_node_track_caller+0xc8f/0xf10 mm/slub.c:4391
 __kmalloc_reserve net/core/skbuff.c:138 [inline]
 __alloc_skb+0x306/0xa10 net/core/skbuff.c:206
 alloc_skb include/linux/skbuff.h:1055 [inline]
 __ip_append_data+0x3901/0x52c0 net/ipv4/ip_output.c:1013
 ip_append_data+0x324/0x480 net/ipv4/ip_output.c:1228
 raw_sendmsg+0x2d02/0x46d0 net/ipv4/raw.c:666
 inet_sendmsg+0x48e/0x750 net/ipv4/af_inet.c:798
 sock_sendmsg_nosec net/socket.c:646 [inline]
 sock_sendmsg net/socket.c:665 [inline]
 ___sys_sendmsg+0xe92/0x13c0 net/socket.c:2286
 __sys_sendmsg net/socket.c:2324 [inline]
 __do_sys_sendmsg net/socket.c:2333 [inline]
 __se_sys_sendmsg+0x305/0x460 net/socket.c:2331
 __x64_sys_sendmsg+0x4a/0x70 net/socket.c:2331
 do_syscall_64+0xbc/0xf0 arch/x86/entry/common.c:302
 entry_SYSCALL_64_after_hwframe+0x63/0xe7
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