================================================================== BUG: KMSAN: uninit-value in inet_gro_receive+0x166c/0x1950 net/ipv4/af_inet.c:1418 CPU: 0 PID: 8 Comm: ksoftirqd/0 Not tainted 4.17.0+ #8 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+0x185/0x1d0 lib/dump_stack.c:113 kmsan_report+0x188/0x2a0 mm/kmsan/kmsan.c:1122 __msan_warning_32+0x70/0xc0 mm/kmsan/kmsan_instr.c:620 inet_gro_receive+0x166c/0x1950 net/ipv4/af_inet.c:1418 dev_gro_receive+0x214c/0x32e0 net/core/dev.c:4989 napi_gro_receive+0x624/0xb60 net/core/dev.c:5124 gro_cell_poll+0x28e/0x410 net/core/gro_cells.c:46 napi_poll net/core/dev.c:5735 [inline] net_rx_action+0x766/0x1a80 net/core/dev.c:5801 __do_softirq+0x592/0x979 kernel/softirq.c:285 run_ksoftirqd+0x1f/0x40 kernel/softirq.c:646 smpboot_thread_fn+0x4ac/0x9a0 kernel/smpboot.c:164 kthread+0x4db/0x6c0 kernel/kthread.c:241 ret_from_fork+0x35/0x40 arch/x86/entry/entry_64.S:412 Uninit was stored to memory at: kmsan_save_stack_with_flags mm/kmsan/kmsan.c:279 [inline] kmsan_save_stack mm/kmsan/kmsan.c:294 [inline] kmsan_internal_chain_origin+0x12b/0x210 mm/kmsan/kmsan.c:686 kmsan_memcpy_origins+0x11d/0x170 mm/kmsan/kmsan.c:527 __msan_memcpy+0x109/0x160 mm/kmsan/kmsan_instr.c:413 pskb_expand_head+0x3a6/0x1a70 net/core/skbuff.c:1470 __pskb_pull_tail+0x1d7/0x2310 net/core/skbuff.c:1881 __skb_linearize include/linux/skbuff.h:3029 [inline] skb_checksum_help+0x250/0xb40 net/core/dev.c:2686 skb_csum_hwoffload_help net/core/dev.c:3103 [inline] validate_xmit_skb+0x10fb/0x1320 net/core/dev.c:3142 __dev_queue_xmit+0x2370/0x3540 net/core/dev.c:3576 dev_queue_xmit+0x4b/0x60 net/core/dev.c:3617 neigh_hh_output include/net/neighbour.h:472 [inline] neigh_output include/net/neighbour.h:480 [inline] ip_finish_output2+0x12a8/0x1480 net/ipv4/ip_output.c:229 ip_finish_output+0xcbc/0x1000 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:444 [inline] ip_local_out+0x164/0x1d0 net/ipv4/ip_output.c:124 iptunnel_xmit+0x854/0xdb0 net/ipv4/ip_tunnel_core.c:91 ip_tunnel_xmit+0x3422/0x37c0 net/ipv4/ip_tunnel.c:778 sit_tunnel_xmit__ net/ipv6/sit.c:1013 [inline] sit_tunnel_xmit+0xd89/0x37e0 net/ipv6/sit.c:1026 __netdev_start_xmit include/linux/netdevice.h:4087 [inline] netdev_start_xmit include/linux/netdevice.h:4096 [inline] xmit_one net/core/dev.c:3053 [inline] dev_hard_start_xmit+0x5f6/0xc80 net/core/dev.c:3069 __dev_queue_xmit+0x2ad2/0x3540 net/core/dev.c:3584 dev_queue_xmit+0x4b/0x60 net/core/dev.c:3617 neigh_direct_output+0x42/0x50 net/core/neighbour.c:1398 neigh_output include/net/neighbour.h:482 [inline] ip_finish_output2+0x1354/0x1480 net/ipv4/ip_output.c:229 ip_finish_output+0xcbc/0x1000 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:444 [inline] ip_local_out net/ipv4/ip_output.c:124 [inline] ip_queue_xmit+0x1b0f/0x1d00 net/ipv4/ip_output.c:504 tcp_transmit_skb+0x3db5/0x5350 net/ipv4/tcp_output.c:1176 tcp_write_xmit+0x2d81/0xb200 net/ipv4/tcp_output.c:2373 __tcp_push_pending_frames+0x124/0x400 net/ipv4/tcp_output.c:2546 do_tcp_sendpages+0x2d43/0x3a00 net/ipv4/tcp.c:1033 tcp_sendpage_locked net/ipv4/tcp.c:1081 [inline] tcp_sendpage+0x1e0/0x240 net/ipv4/tcp.c:1091 inet_sendpage+0x505/0x8f0 net/ipv4/af_inet.c:815 kernel_sendpage net/socket.c:3323 [inline] sock_sendpage+0x1ef/0x2e0 net/socket.c:854 pipe_to_sendpage+0x321/0x440 fs/splice.c:451 splice_from_pipe_feed fs/splice.c:502 [inline] __splice_from_pipe+0x4a5/0xf50 fs/splice.c:626 splice_from_pipe fs/splice.c:661 [inline] generic_splice_sendpage+0x1c6/0x2a0 fs/splice.c:832 do_splice_from fs/splice.c:851 [inline] direct_splice_actor+0x19e/0x200 fs/splice.c:1018 splice_direct_to_actor+0x767/0x1040 fs/splice.c:973 do_splice_direct+0x335/0x540 fs/splice.c:1061 do_sendfile+0x107b/0x1e40 fs/read_write.c:1440 __do_sys_sendfile64 fs/read_write.c:1495 [inline] __se_sys_sendfile64 fs/read_write.c:1487 [inline] __x64_sys_sendfile64+0x218/0x390 fs/read_write.c:1487 do_syscall_64+0x15b/0x230 arch/x86/entry/common.c:287 entry_SYSCALL_64_after_hwframe+0x44/0xa9 Uninit was created at: kmsan_save_stack_with_flags mm/kmsan/kmsan.c:279 [inline] kmsan_internal_poison_shadow+0xb8/0x1b0 mm/kmsan/kmsan.c:189 kmsan_kmalloc+0x94/0x100 mm/kmsan/kmsan.c:315 kmsan_slab_alloc+0x10/0x20 mm/kmsan/kmsan.c:322 slab_post_alloc_hook mm/slab.h:446 [inline] slab_alloc_node mm/slub.c:2753 [inline] __kmalloc_node_track_caller+0xb35/0x11b0 mm/slub.c:4395 __kmalloc_reserve net/core/skbuff.c:138 [inline] __alloc_skb+0x2cb/0x9e0 net/core/skbuff.c:206 alloc_skb_fclone include/linux/skbuff.h:1030 [inline] sk_stream_alloc_skb+0x17c/0xcf0 net/ipv4/tcp.c:875 do_tcp_sendpages+0x15fc/0x3a00 net/ipv4/tcp.c:978 tcp_sendpage_locked net/ipv4/tcp.c:1081 [inline] tcp_sendpage+0x1e0/0x240 net/ipv4/tcp.c:1091 inet_sendpage+0x505/0x8f0 net/ipv4/af_inet.c:815 kernel_sendpage net/socket.c:3323 [inline] sock_sendpage+0x1ef/0x2e0 net/socket.c:854 pipe_to_sendpage+0x321/0x440 fs/splice.c:451 splice_from_pipe_feed fs/splice.c:502 [inline] __splice_from_pipe+0x4a5/0xf50 fs/splice.c:626 splice_from_pipe fs/splice.c:661 [inline] generic_splice_sendpage+0x1c6/0x2a0 fs/splice.c:832 do_splice_from fs/splice.c:851 [inline] direct_splice_actor+0x19e/0x200 fs/splice.c:1018 splice_direct_to_actor+0x767/0x1040 fs/splice.c:973 do_splice_direct+0x335/0x540 fs/splice.c:1061 do_sendfile+0x107b/0x1e40 fs/read_write.c:1440 __do_sys_sendfile64 fs/read_write.c:1495 [inline] __se_sys_sendfile64 fs/read_write.c:1487 [inline] __x64_sys_sendfile64+0x218/0x390 fs/read_write.c:1487 do_syscall_64+0x15b/0x230 arch/x86/entry/common.c:287 entry_SYSCALL_64_after_hwframe+0x44/0xa9 ==================================================================