===================================================== BUG: KMSAN: uninit-value in __skb_checksum_complete+0x37f/0x540 net/core/skbuff.c:2850 CPU: 1 PID: 11456 Comm: syz-executor.5 Not tainted 5.8.0-rc5-syzkaller #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+0x1df/0x240 lib/dump_stack.c:118 kmsan_report+0xf7/0x1e0 mm/kmsan/kmsan_report.c:121 __msan_warning+0x58/0xa0 mm/kmsan/kmsan_instr.c:215 __skb_checksum_complete+0x37f/0x540 net/core/skbuff.c:2850 nf_ip6_checksum+0x501/0x610 net/netfilter/utils.c:91 nf_nat_icmpv6_reply_translation+0x24b/0x10c0 net/netfilter/nf_nat_proto.c:800 nf_nat_ipv6_fn+0x394/0x4d0 net/netfilter/nf_nat_proto.c:873 nf_nat_ipv6_local_fn+0xb0/0x690 net/netfilter/nf_nat_proto.c:946 nf_hook_entry_hookfn include/linux/netfilter.h:135 [inline] nf_hook_slow+0x16e/0x400 net/netfilter/core.c:512 nf_hook include/linux/netfilter.h:262 [inline] __ip6_local_out+0x56d/0x750 net/ipv6/output_core.c:167 ip6_local_out+0xa4/0x1d0 net/ipv6/output_core.c:177 ip6_send_skb net/ipv6/ip6_output.c:1865 [inline] ip6_push_pending_frames+0x213/0x4f0 net/ipv6/ip6_output.c:1885 icmpv6_push_pending_frames+0x674/0x6b0 net/ipv6/icmp.c:304 icmp6_send+0x32c7/0x3a00 net/ipv6/icmp.c:617 icmpv6_send+0xe4/0x110 net/ipv6/ip6_icmp.c:43 ip6_link_failure+0x68/0x590 net/ipv6/route.c:2668 dst_link_failure include/net/dst.h:426 [inline] vti_xmit net/ipv4/ip_vti.c:295 [inline] vti_tunnel_xmit+0x164b/0x22d0 net/ipv4/ip_vti.c:331 __netdev_start_xmit include/linux/netdevice.h:4611 [inline] netdev_start_xmit include/linux/netdevice.h:4625 [inline] xmit_one net/core/dev.c:3556 [inline] dev_hard_start_xmit+0x50e/0xa70 net/core/dev.c:3572 __dev_queue_xmit+0x2f8d/0x3b20 net/core/dev.c:4131 dev_queue_xmit+0x4b/0x60 net/core/dev.c:4164 neigh_connected_output+0x662/0x6e0 net/core/neighbour.c:1518 neigh_output include/net/neighbour.h:509 [inline] ip6_finish_output2+0x20fb/0x2620 net/ipv6/ip6_output.c:117 ip6_fragment+0x24a9/0x3950 net/ipv6/ip6_output.c:861 __ip6_finish_output+0x73a/0x8e0 net/ipv6/ip6_output.c:141 ip6_finish_output+0x166/0x410 net/ipv6/ip6_output.c:153 NF_HOOK_COND include/linux/netfilter.h:296 [inline] ip6_output+0x60a/0x770 net/ipv6/ip6_output.c:176 dst_output include/net/dst.h:443 [inline] ip6_local_out+0x164/0x1d0 net/ipv6/output_core.c:179 ip6_send_skb net/ipv6/ip6_output.c:1865 [inline] ip6_push_pending_frames+0x213/0x4f0 net/ipv6/ip6_output.c:1885 rawv6_push_pending_frames net/ipv6/raw.c:613 [inline] rawv6_sendmsg+0x4233/0x5c30 net/ipv6/raw.c:956 inet_sendmsg+0x2d8/0x2e0 net/ipv4/af_inet.c:814 sock_sendmsg_nosec net/socket.c:652 [inline] sock_sendmsg net/socket.c:672 [inline] kernel_sendmsg+0x384/0x440 net/socket.c:692 sock_no_sendpage+0x235/0x300 net/core/sock.c:2853 kernel_sendpage net/socket.c:3642 [inline] sock_sendpage+0x1e1/0x2c0 net/socket.c:945 pipe_to_sendpage+0x38c/0x4c0 fs/splice.c:448 splice_from_pipe_feed fs/splice.c:502 [inline] __splice_from_pipe+0x565/0xf00 fs/splice.c:626 splice_from_pipe fs/splice.c:661 [inline] generic_splice_sendpage+0x1d5/0x2d0 fs/splice.c:834 do_splice_from fs/splice.c:846 [inline] direct_splice_actor+0x1fd/0x580 fs/splice.c:1016 splice_direct_to_actor+0x6b2/0xf50 fs/splice.c:971 do_splice_direct+0x342/0x580 fs/splice.c:1059 do_sendfile+0x101b/0x1d40 fs/read_write.c:1540 __do_sys_sendfile64 fs/read_write.c:1601 [inline] __se_sys_sendfile64+0x2bb/0x360 fs/read_write.c:1587 __x64_sys_sendfile64+0x56/0x70 fs/read_write.c:1587 do_syscall_64+0xb0/0x150 arch/x86/entry/common.c:386 entry_SYSCALL_64_after_hwframe+0x44/0xa9 RIP: 0033:0x45c1d9 Code: Bad RIP value. RSP: 002b:00007f80a3c37c78 EFLAGS: 00000246 ORIG_RAX: 0000000000000028 RAX: ffffffffffffffda RBX: 0000000000025a00 RCX: 000000000045c1d9 RDX: 0000000000000000 RSI: 0000000000000006 RDI: 0000000000000004 RBP: 000000000078bf48 R08: 0000000000000000 R09: 0000000000000000 R10: 000000000000a808 R11: 0000000000000246 R12: 000000000078bf0c R13: 0000000000c9fb6f R14: 00007f80a3c389c0 R15: 000000000078bf0c Uninit was stored to memory at: kmsan_save_stack_with_flags mm/kmsan/kmsan.c:144 [inline] kmsan_internal_chain_origin+0xad/0x130 mm/kmsan/kmsan.c:310 kmsan_memcpy_memmove_metadata+0x272/0x2e0 mm/kmsan/kmsan.c:247 kmsan_memcpy_metadata+0xb/0x10 mm/kmsan/kmsan.c:267 __msan_memcpy+0x43/0x50 mm/kmsan/kmsan_instr.c:116 csum_partial_copy+0xae/0x100 lib/checksum.c:154 skb_copy_and_csum_bits+0x227/0x1130 net/core/skbuff.c:2737 icmpv6_getfrag+0x15f/0x350 net/ipv6/icmp.c:319 __ip6_append_data+0x507b/0x6320 net/ipv6/ip6_output.c:1623 ip6_append_data+0x3cb/0x660 net/ipv6/ip6_output.c:1757 icmp6_send+0x308e/0x3a00 net/ipv6/icmp.c:609 icmpv6_send+0xe4/0x110 net/ipv6/ip6_icmp.c:43 ip6_link_failure+0x68/0x590 net/ipv6/route.c:2668 dst_link_failure include/net/dst.h:426 [inline] vti_xmit net/ipv4/ip_vti.c:295 [inline] vti_tunnel_xmit+0x164b/0x22d0 net/ipv4/ip_vti.c:331 __netdev_start_xmit include/linux/netdevice.h:4611 [inline] netdev_start_xmit include/linux/netdevice.h:4625 [inline] xmit_one net/core/dev.c:3556 [inline] dev_hard_start_xmit+0x50e/0xa70 net/core/dev.c:3572 __dev_queue_xmit+0x2f8d/0x3b20 net/core/dev.c:4131 dev_queue_xmit+0x4b/0x60 net/core/dev.c:4164 neigh_connected_output+0x662/0x6e0 net/core/neighbour.c:1518 neigh_output include/net/neighbour.h:509 [inline] ip6_finish_output2+0x20fb/0x2620 net/ipv6/ip6_output.c:117 ip6_fragment+0x24a9/0x3950 net/ipv6/ip6_output.c:861 __ip6_finish_output+0x73a/0x8e0 net/ipv6/ip6_output.c:141 ip6_finish_output+0x166/0x410 net/ipv6/ip6_output.c:153 NF_HOOK_COND include/linux/netfilter.h:296 [inline] ip6_output+0x60a/0x770 net/ipv6/ip6_output.c:176 dst_output include/net/dst.h:443 [inline] ip6_local_out+0x164/0x1d0 net/ipv6/output_core.c:179 ip6_send_skb net/ipv6/ip6_output.c:1865 [inline] ip6_push_pending_frames+0x213/0x4f0 net/ipv6/ip6_output.c:1885 rawv6_push_pending_frames net/ipv6/raw.c:613 [inline] rawv6_sendmsg+0x4233/0x5c30 net/ipv6/raw.c:956 inet_sendmsg+0x2d8/0x2e0 net/ipv4/af_inet.c:814 sock_sendmsg_nosec net/socket.c:652 [inline] sock_sendmsg net/socket.c:672 [inline] kernel_sendmsg+0x384/0x440 net/socket.c:692 sock_no_sendpage+0x235/0x300 net/core/sock.c:2853 kernel_sendpage net/socket.c:3642 [inline] sock_sendpage+0x1e1/0x2c0 net/socket.c:945 pipe_to_sendpage+0x38c/0x4c0 fs/splice.c:448 splice_from_pipe_feed fs/splice.c:502 [inline] __splice_from_pipe+0x565/0xf00 fs/splice.c:626 splice_from_pipe fs/splice.c:661 [inline] generic_splice_sendpage+0x1d5/0x2d0 fs/splice.c:834 do_splice_from fs/splice.c:846 [inline] direct_splice_actor+0x1fd/0x580 fs/splice.c:1016 splice_direct_to_actor+0x6b2/0xf50 fs/splice.c:971 do_splice_direct+0x342/0x580 fs/splice.c:1059 do_sendfile+0x101b/0x1d40 fs/read_write.c:1540 __do_sys_sendfile64 fs/read_write.c:1601 [inline] __se_sys_sendfile64+0x2bb/0x360 fs/read_write.c:1587 __x64_sys_sendfile64+0x56/0x70 fs/read_write.c:1587 do_syscall_64+0xb0/0x150 arch/x86/entry/common.c:386 entry_SYSCALL_64_after_hwframe+0x44/0xa9 Uninit was stored to memory at: kmsan_save_stack_with_flags mm/kmsan/kmsan.c:144 [inline] kmsan_internal_chain_origin+0xad/0x130 mm/kmsan/kmsan.c:310 kmsan_memcpy_memmove_metadata+0x272/0x2e0 mm/kmsan/kmsan.c:247 kmsan_memcpy_metadata+0xb/0x10 mm/kmsan/kmsan.c:267 __msan_memcpy+0x43/0x50 mm/kmsan/kmsan_instr.c:116 csum_partial_copy+0xae/0x100 lib/checksum.c:154 csum_and_memcpy lib/iov_iter.c:586 [inline] csum_and_copy_from_iter_full+0xdca/0x1800 lib/iov_iter.c:1495 ip_generic_getfrag+0x1fb/0x3c0 net/ipv4/ip_output.c:932 raw6_getfrag+0x552/0x600 net/ipv6/raw.c:763 __ip6_append_data+0x507b/0x6320 net/ipv6/ip6_output.c:1623 ip6_append_data+0x3cb/0x660 net/ipv6/ip6_output.c:1757 rawv6_sendmsg+0x32bb/0x5c30 net/ipv6/raw.c:949 inet_sendmsg+0x2d8/0x2e0 net/ipv4/af_inet.c:814 sock_sendmsg_nosec net/socket.c:652 [inline] sock_sendmsg net/socket.c:672 [inline] kernel_sendmsg+0x384/0x440 net/socket.c:692 sock_no_sendpage+0x235/0x300 net/core/sock.c:2853 kernel_sendpage net/socket.c:3642 [inline] sock_sendpage+0x1e1/0x2c0 net/socket.c:945 pipe_to_sendpage+0x38c/0x4c0 fs/splice.c:448 splice_from_pipe_feed fs/splice.c:502 [inline] __splice_from_pipe+0x565/0xf00 fs/splice.c:626 splice_from_pipe fs/splice.c:661 [inline] generic_splice_sendpage+0x1d5/0x2d0 fs/splice.c:834 do_splice_from fs/splice.c:846 [inline] direct_splice_actor+0x1fd/0x580 fs/splice.c:1016 splice_direct_to_actor+0x6b2/0xf50 fs/splice.c:971 do_splice_direct+0x342/0x580 fs/splice.c:1059 do_sendfile+0x101b/0x1d40 fs/read_write.c:1540 __do_sys_sendfile64 fs/read_write.c:1601 [inline] __se_sys_sendfile64+0x2bb/0x360 fs/read_write.c:1587 __x64_sys_sendfile64+0x56/0x70 fs/read_write.c:1587 do_syscall_64+0xb0/0x150 arch/x86/entry/common.c:386 entry_SYSCALL_64_after_hwframe+0x44/0xa9 Uninit was created at: kmsan_save_stack_with_flags+0x3c/0x90 mm/kmsan/kmsan.c:144 kmsan_internal_alloc_meta_for_pages mm/kmsan/kmsan_shadow.c:269 [inline] kmsan_alloc_page+0xb9/0x180 mm/kmsan/kmsan_shadow.c:293 __alloc_pages_nodemask+0x56a2/0x5dc0 mm/page_alloc.c:4889 alloc_pages_current+0x672/0x990 mm/mempolicy.c:2292 alloc_pages include/linux/gfp.h:545 [inline] push_pipe+0x605/0xb70 lib/iov_iter.c:537 __pipe_get_pages lib/iov_iter.c:1278 [inline] pipe_get_pages_alloc lib/iov_iter.c:1385 [inline] iov_iter_get_pages_alloc+0x18a9/0x21c0 lib/iov_iter.c:1403 default_file_splice_read fs/splice.c:385 [inline] do_splice_to+0x4fc/0x14f0 fs/splice.c:871 splice_direct_to_actor+0x45c/0xf50 fs/splice.c:950 do_splice_direct+0x342/0x580 fs/splice.c:1059 do_sendfile+0x101b/0x1d40 fs/read_write.c:1540 __do_sys_sendfile64 fs/read_write.c:1601 [inline] __se_sys_sendfile64+0x2bb/0x360 fs/read_write.c:1587 __x64_sys_sendfile64+0x56/0x70 fs/read_write.c:1587 do_syscall_64+0xb0/0x150 arch/x86/entry/common.c:386 entry_SYSCALL_64_after_hwframe+0x44/0xa9 =====================================================