================================================================== BUG: KMSAN: uninit-value in __skb_checksum_complete+0x30e/0x430 net/core/datagram.c:756 CPU: 1 PID: 14 Comm: ksoftirqd/1 Not tainted 4.16.0+ #85 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 __skb_checksum_complete+0x30e/0x430 net/core/datagram.c:756 __skb_checksum_validate_complete include/linux/skbuff.h:3698 [inline] icmpv6_rcv+0xbfd/0x39b0 net/ipv6/icmp.c:833 ip6_input_finish+0xaac/0x2250 net/ipv6/ip6_input.c:284 NF_HOOK include/linux/netfilter.h:288 [inline] ip6_input+0x294/0x320 net/ipv6/ip6_input.c:327 dst_input include/net/dst.h:449 [inline] ip6_rcv_finish+0x46e/0x6e0 net/ipv6/ip6_input.c:71 NF_HOOK include/linux/netfilter.h:288 [inline] ipv6_rcv+0x1e16/0x2340 net/ipv6/ip6_input.c:208 __netif_receive_skb_core+0x47df/0x4a90 net/core/dev.c:4562 __netif_receive_skb net/core/dev.c:4627 [inline] process_backlog+0x62d/0xe20 net/core/dev.c:5307 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 csum_partial_copy+0xbc/0x500 lib/checksum.c:178 skb_copy_and_csum_bits+0x71a/0x1110 net/core/skbuff.c:2592 icmpv6_getfrag+0x174/0x360 net/ipv6/icmp.c:303 __ip6_append_data+0x3e34/0x4bc0 net/ipv6/ip6_output.c:1463 ip6_append_data+0x40e/0x6b0 net/ipv6/ip6_output.c:1576 icmp6_send+0x3168/0x3730 net/ipv6/icmp.c:574 icmpv6_send+0xe0/0x110 net/ipv6/ip6_icmp.c:43 ip6_link_failure+0x8f/0x580 net/ipv6/route.c:2034 dst_link_failure include/net/dst.h:426 [inline] ndisc_error_report+0x101/0x1a0 net/ipv6/ndisc.c:695 neigh_invalidate+0x385/0x930 net/core/neighbour.c:883 neigh_timer_handler+0xd85/0x12d0 net/core/neighbour.c:969 call_timer_fn+0x26a/0x5a0 kernel/time/timer.c:1326 expire_timers kernel/time/timer.c:1363 [inline] __run_timers+0xda7/0x11c0 kernel/time/timer.c:1666 run_timer_softirq+0x43/0x70 kernel/time/timer.c:1692 __do_softirq+0x56d/0x93d kernel/softirq.c:285 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 csum_partial_copy+0xbc/0x500 lib/checksum.c:178 csum_and_copy_from_iter_full+0x107d/0x1a60 lib/iov_iter.c:1240 ip_generic_getfrag+0x1f0/0x3b0 net/ipv4/ip_output.c:837 __ip6_append_data+0x24fc/0x4bc0 net/ipv6/ip6_output.c:1518 ip6_append_data+0x40e/0x6b0 net/ipv6/ip6_output.c:1576 udpv6_sendmsg+0xfcc/0x47c0 net/ipv6/udp.c:1337 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] kernel_sendmsg+0x228/0x2d0 net/socket.c:648 sock_no_sendpage+0x1c8/0x250 net/core/sock.c:2578 kernel_sendpage net/socket.c:3234 [inline] sock_sendpage+0x1de/0x2c0 net/socket.c:855 pipe_to_sendpage+0x31b/0x430 fs/splice.c:451 splice_from_pipe_feed fs/splice.c:502 [inline] __splice_from_pipe+0x49a/0xf30 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+0x19b/0x200 fs/splice.c:1018 splice_direct_to_actor+0x764/0x1040 fs/splice.c:973 do_splice_direct+0x335/0x540 fs/splice.c:1061 do_sendfile+0x1067/0x1e40 fs/read_write.c:1413 SYSC_sendfile64+0x1b3/0x300 fs/read_write.c:1468 SyS_sendfile64+0x64/0x90 fs/read_write.c:1460 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_alloc_meta_for_pages+0x161/0x3a0 mm/kmsan/kmsan.c:814 kmsan_alloc_page+0x82/0xe0 mm/kmsan/kmsan.c:868 __alloc_pages_nodemask+0xf5b/0x5dc0 mm/page_alloc.c:4283 alloc_pages_vma+0xcc8/0x1800 mm/mempolicy.c:2019 shmem_alloc_page mm/shmem.c:1471 [inline] shmem_alloc_and_acct_page+0x6d5/0x1000 mm/shmem.c:1496 shmem_getpage_gfp+0x35db/0x5770 mm/shmem.c:1771 shmem_getpage mm/shmem.c:131 [inline] shmem_file_read_iter+0x508/0x1180 mm/shmem.c:2456 call_read_iter include/linux/fs.h:1776 [inline] generic_file_splice_read+0x5d2/0x900 fs/splice.c:307 do_splice_to fs/splice.c:880 [inline] splice_direct_to_actor+0x4c6/0x1040 fs/splice.c:952 do_splice_direct+0x335/0x540 fs/splice.c:1061 do_sendfile+0x1067/0x1e40 fs/read_write.c:1413 SYSC_sendfile64+0x1b3/0x300 fs/read_write.c:1468 SyS_sendfile64+0x64/0x90 fs/read_write.c:1460 do_syscall_64+0x309/0x430 arch/x86/entry/common.c:287 entry_SYSCALL_64_after_hwframe+0x3d/0xa2 ==================================================================