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BUG: KMSAN: uninit-value in __skb_dst_copy include/net/dst.h:279 [inline]
BUG: KMSAN: uninit-value in skb_dst_copy include/net/dst.h:285 [inline]
BUG: KMSAN: uninit-value in __copy_skb_header+0x2bf/0x720 net/core/skbuff.c:935
CPU: 1 PID: 16 Comm: ksoftirqd/1 Not tainted 5.4.0-rc5+ #0
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+0x128/0x220 mm/kmsan/kmsan_report.c:108
 __msan_warning+0x73/0xe0 mm/kmsan/kmsan_instr.c:245
 __skb_dst_copy include/net/dst.h:279 [inline]
 skb_dst_copy include/net/dst.h:285 [inline]
 __copy_skb_header+0x2bf/0x720 net/core/skbuff.c:935
 __skb_clone+0xa2/0x970 net/core/skbuff.c:987
 skb_clone+0x402/0x5d0 net/core/skbuff.c:1455
 skb_share_check include/linux/skbuff.h:1670 [inline]
 packet_rcv_spkt+0x23f/0x7c0 net/packet/af_packet.c:1816
 deliver_skb net/core/dev.c:1969 [inline]
 deliver_ptype_list_skb net/core/dev.c:1984 [inline]
 __netif_receive_skb_core+0x3aed/0x51a0 net/core/dev.c:4968
 __netif_receive_skb_one_core net/core/dev.c:5008 [inline]
 __netif_receive_skb net/core/dev.c:5124 [inline]
 netif_receive_skb_internal+0x3cc/0xc20 net/core/dev.c:5214
 napi_skb_finish net/core/dev.c:5677 [inline]
 napi_gro_receive+0x67f/0xbb0 net/core/dev.c:5710
 receive_buf+0x653b/0x8810 drivers/net/virtio_net.c:1061
 virtnet_receive drivers/net/virtio_net.c:1323 [inline]
 virtnet_poll+0x666/0x1a10 drivers/net/virtio_net.c:1428
 napi_poll net/core/dev.c:6392 [inline]
 net_rx_action+0x7a6/0x1aa0 net/core/dev.c:6460
 __do_softirq+0x4a1/0x83a kernel/softirq.c:293
 run_ksoftirqd+0x25/0x40 kernel/softirq.c:607
 smpboot_thread_fn+0x4a3/0x990 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 created at:
 kmsan_save_stack_with_flags mm/kmsan/kmsan.c:151 [inline]
 kmsan_internal_poison_shadow+0x60/0x120 mm/kmsan/kmsan.c:134
 kmsan_slab_alloc+0xaa/0x120 mm/kmsan/kmsan_hooks.c:88
 slab_alloc_node mm/slub.c:2799 [inline]
 slab_alloc mm/slub.c:2808 [inline]
 kmem_cache_alloc+0x8d9/0xd20 mm/slub.c:2813
 skb_clone+0x326/0x5d0 net/core/skbuff.c:1448
 skb_share_check include/linux/skbuff.h:1670 [inline]
 packet_rcv_spkt+0x23f/0x7c0 net/packet/af_packet.c:1816
 deliver_skb net/core/dev.c:1969 [inline]
 deliver_ptype_list_skb net/core/dev.c:1984 [inline]
 __netif_receive_skb_core+0x3aed/0x51a0 net/core/dev.c:4968
 __netif_receive_skb_one_core net/core/dev.c:5008 [inline]
 __netif_receive_skb net/core/dev.c:5124 [inline]
 netif_receive_skb_internal+0x3cc/0xc20 net/core/dev.c:5214
 napi_skb_finish net/core/dev.c:5677 [inline]
 napi_gro_receive+0x67f/0xbb0 net/core/dev.c:5710
 receive_buf+0x653b/0x8810 drivers/net/virtio_net.c:1061
 virtnet_receive drivers/net/virtio_net.c:1323 [inline]
 virtnet_poll+0x666/0x1a10 drivers/net/virtio_net.c:1428
 napi_poll net/core/dev.c:6392 [inline]
 net_rx_action+0x7a6/0x1aa0 net/core/dev.c:6460
 __do_softirq+0x4a1/0x83a kernel/softirq.c:293
 run_ksoftirqd+0x25/0x40 kernel/softirq.c:607
 smpboot_thread_fn+0x4a3/0x990 kernel/smpboot.c:165
 kthread+0x4b5/0x4f0 kernel/kthread.c:256
 ret_from_fork+0x35/0x40 arch/x86/entry/entry_64.S:355
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