=====================================================
BUG: KMSAN: uninit-value in ____bpf_skb_load_helper_16 net/core/filter.c:211 [inline]
BUG: KMSAN: uninit-value in bpf_skb_load_helper_16+0xd9/0x2b0 net/core/filter.c:205
CPU: 1 PID: 18107 Comm: syz-executor.0 Not tainted 5.7.0-rc4-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+0x1c9/0x220 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
 ____bpf_skb_load_helper_16 net/core/filter.c:211 [inline]
 bpf_skb_load_helper_16+0xd9/0x2b0 net/core/filter.c:205
 ___bpf_prog_run+0x214d/0x97a0 kernel/bpf/core.c:1516
 __bpf_prog_run32+0x101/0x170 kernel/bpf/core.c:1681
 bpf_dispatcher_nop_func include/linux/bpf.h:545 [inline]
 bpf_prog_run_pin_on_cpu include/linux/filter.h:599 [inline]
 bpf_prog_run_clear_cb include/linux/filter.h:721 [inline]
 run_filter net/packet/af_packet.c:2012 [inline]
 packet_rcv+0x70f/0x2160 net/packet/af_packet.c:2085
 dev_queue_xmit_nit+0x1199/0x1270 net/core/dev.c:2276
 xmit_one net/core/dev.c:3473 [inline]
 dev_hard_start_xmit+0x20f/0xab0 net/core/dev.c:3493
 __dev_queue_xmit+0x2f8d/0x3b20 net/core/dev.c:4052
 dev_queue_xmit+0x4b/0x60 net/core/dev.c:4085
 neigh_direct_output+0x42/0x50 net/core/neighbour.c:1529
 neigh_output include/net/neighbour.h:510 [inline]
 ip6_finish_output2+0x20fd/0x2640 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:435 [inline]
 ip6_local_out+0x164/0x1d0 net/ipv6/output_core.c:179
 ip6_send_skb+0xfa/0x390 net/ipv6/ip6_output.c:1865
 udp_v6_send_skb+0x1834/0x1e80 net/ipv6/udp.c:1175
 udpv6_sendmsg+0x4570/0x4940 net/ipv6/udp.c:1473
 inet6_sendmsg+0x276/0x2e0 net/ipv6/af_inet6.c:577
 sock_sendmsg_nosec net/socket.c:652 [inline]
 sock_sendmsg net/socket.c:672 [inline]
 kernel_sendmsg+0x24a/0x440 net/socket.c:692
 sock_no_sendpage+0x235/0x300 net/core/sock.c:2763
 kernel_sendpage net/socket.c:3808 [inline]
 sock_sendpage+0x1e1/0x2c0 net/socket.c:950
 pipe_to_sendpage+0x38c/0x4c0 fs/splice.c:458
 splice_from_pipe_feed fs/splice.c:512 [inline]
 __splice_from_pipe+0x539/0xed0 fs/splice.c:636
 splice_from_pipe fs/splice.c:671 [inline]
 generic_splice_sendpage+0x1d5/0x2d0 fs/splice.c:844
 do_splice_from fs/splice.c:863 [inline]
 direct_splice_actor+0x19e/0x200 fs/splice.c:1037
 splice_direct_to_actor+0x8a9/0x11e0 fs/splice.c:992
 do_splice_direct+0x342/0x580 fs/splice.c:1080
 do_sendfile+0x101b/0x1d40 fs/read_write.c:1521
 __do_sys_sendfile64 fs/read_write.c:1582 [inline]
 __se_sys_sendfile64+0x2bb/0x360 fs/read_write.c:1568
 __x64_sys_sendfile64+0x56/0x70 fs/read_write.c:1568
 do_syscall_64+0xb8/0x160 arch/x86/entry/common.c:297
 entry_SYSCALL_64_after_hwframe+0x44/0xa9
RIP: 0033:0x45ca29
Code: 0d b7 fb ff c3 66 2e 0f 1f 84 00 00 00 00 00 66 90 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 0f 83 db b6 fb ff c3 66 2e 0f 1f 84 00 00 00 00
RSP: 002b:00007f78f4149c78 EFLAGS: 00000246 ORIG_RAX: 0000000000000028
RAX: ffffffffffffffda RBX: 00000000004fc540 RCX: 000000000045ca29
RDX: 0000000000000000 RSI: 0000000000000005 RDI: 0000000000000004
RBP: 000000000078bf00 R08: 0000000000000000 R09: 0000000000000000
R10: 000000000000edc0 R11: 0000000000000246 R12: 00000000ffffffff
R13: 00000000000008dc R14: 00000000004cba16 R15: 00007f78f414a6d4

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
 __msan_chain_origin+0x50/0x90 mm/kmsan/kmsan_instr.c:165
 ___bpf_prog_run+0x6cbe/0x97a0 kernel/bpf/core.c:1391
 __bpf_prog_run32+0x101/0x170 kernel/bpf/core.c:1681
 bpf_dispatcher_nop_func include/linux/bpf.h:545 [inline]
 bpf_prog_run_pin_on_cpu include/linux/filter.h:599 [inline]
 bpf_prog_run_clear_cb include/linux/filter.h:721 [inline]
 run_filter net/packet/af_packet.c:2012 [inline]
 packet_rcv+0x70f/0x2160 net/packet/af_packet.c:2085
 dev_queue_xmit_nit+0x1199/0x1270 net/core/dev.c:2276
 xmit_one net/core/dev.c:3473 [inline]
 dev_hard_start_xmit+0x20f/0xab0 net/core/dev.c:3493
 __dev_queue_xmit+0x2f8d/0x3b20 net/core/dev.c:4052
 dev_queue_xmit+0x4b/0x60 net/core/dev.c:4085
 neigh_direct_output+0x42/0x50 net/core/neighbour.c:1529
 neigh_output include/net/neighbour.h:510 [inline]
 ip6_finish_output2+0x20fd/0x2640 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:435 [inline]
 ip6_local_out+0x164/0x1d0 net/ipv6/output_core.c:179
 ip6_send_skb+0xfa/0x390 net/ipv6/ip6_output.c:1865
 udp_v6_send_skb+0x1834/0x1e80 net/ipv6/udp.c:1175
 udpv6_sendmsg+0x4570/0x4940 net/ipv6/udp.c:1473
 inet6_sendmsg+0x276/0x2e0 net/ipv6/af_inet6.c:577
 sock_sendmsg_nosec net/socket.c:652 [inline]
 sock_sendmsg net/socket.c:672 [inline]
 kernel_sendmsg+0x24a/0x440 net/socket.c:692
 sock_no_sendpage+0x235/0x300 net/core/sock.c:2763
 kernel_sendpage net/socket.c:3808 [inline]
 sock_sendpage+0x1e1/0x2c0 net/socket.c:950
 pipe_to_sendpage+0x38c/0x4c0 fs/splice.c:458
 splice_from_pipe_feed fs/splice.c:512 [inline]
 __splice_from_pipe+0x539/0xed0 fs/splice.c:636
 splice_from_pipe fs/splice.c:671 [inline]
 generic_splice_sendpage+0x1d5/0x2d0 fs/splice.c:844
 do_splice_from fs/splice.c:863 [inline]
 direct_splice_actor+0x19e/0x200 fs/splice.c:1037
 splice_direct_to_actor+0x8a9/0x11e0 fs/splice.c:992
 do_splice_direct+0x342/0x580 fs/splice.c:1080
 do_sendfile+0x101b/0x1d40 fs/read_write.c:1521
 __do_sys_sendfile64 fs/read_write.c:1582 [inline]
 __se_sys_sendfile64+0x2bb/0x360 fs/read_write.c:1568
 __x64_sys_sendfile64+0x56/0x70 fs/read_write.c:1568
 do_syscall_64+0xb8/0x160 arch/x86/entry/common.c:297
 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
 __msan_chain_origin+0x50/0x90 mm/kmsan/kmsan_instr.c:165
 ___bpf_prog_run+0x6c64/0x97a0 kernel/bpf/core.c:1391
 __bpf_prog_run32+0x101/0x170 kernel/bpf/core.c:1681
 bpf_dispatcher_nop_func include/linux/bpf.h:545 [inline]
 bpf_prog_run_pin_on_cpu include/linux/filter.h:599 [inline]
 bpf_prog_run_clear_cb include/linux/filter.h:721 [inline]
 run_filter net/packet/af_packet.c:2012 [inline]
 packet_rcv+0x70f/0x2160 net/packet/af_packet.c:2085
 dev_queue_xmit_nit+0x1199/0x1270 net/core/dev.c:2276
 xmit_one net/core/dev.c:3473 [inline]
 dev_hard_start_xmit+0x20f/0xab0 net/core/dev.c:3493
 __dev_queue_xmit+0x2f8d/0x3b20 net/core/dev.c:4052
 dev_queue_xmit+0x4b/0x60 net/core/dev.c:4085
 neigh_direct_output+0x42/0x50 net/core/neighbour.c:1529
 neigh_output include/net/neighbour.h:510 [inline]
 ip6_finish_output2+0x20fd/0x2640 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:435 [inline]
 ip6_local_out+0x164/0x1d0 net/ipv6/output_core.c:179
 ip6_send_skb+0xfa/0x390 net/ipv6/ip6_output.c:1865
 udp_v6_send_skb+0x1834/0x1e80 net/ipv6/udp.c:1175
 udpv6_sendmsg+0x4570/0x4940 net/ipv6/udp.c:1473
 inet6_sendmsg+0x276/0x2e0 net/ipv6/af_inet6.c:577
 sock_sendmsg_nosec net/socket.c:652 [inline]
 sock_sendmsg net/socket.c:672 [inline]
 kernel_sendmsg+0x24a/0x440 net/socket.c:692
 sock_no_sendpage+0x235/0x300 net/core/sock.c:2763
 kernel_sendpage net/socket.c:3808 [inline]
 sock_sendpage+0x1e1/0x2c0 net/socket.c:950
 pipe_to_sendpage+0x38c/0x4c0 fs/splice.c:458
 splice_from_pipe_feed fs/splice.c:512 [inline]
 __splice_from_pipe+0x539/0xed0 fs/splice.c:636
 splice_from_pipe fs/splice.c:671 [inline]
 generic_splice_sendpage+0x1d5/0x2d0 fs/splice.c:844
 do_splice_from fs/splice.c:863 [inline]
 direct_splice_actor+0x19e/0x200 fs/splice.c:1037
 splice_direct_to_actor+0x8a9/0x11e0 fs/splice.c:992
 do_splice_direct+0x342/0x580 fs/splice.c:1080
 do_sendfile+0x101b/0x1d40 fs/read_write.c:1521
 __do_sys_sendfile64 fs/read_write.c:1582 [inline]
 __se_sys_sendfile64+0x2bb/0x360 fs/read_write.c:1568
 __x64_sys_sendfile64+0x56/0x70 fs/read_write.c:1568
 do_syscall_64+0xb8/0x160 arch/x86/entry/common.c:297
 entry_SYSCALL_64_after_hwframe+0x44/0xa9

Local variable ----regs@__bpf_prog_run32 created at:
 __bpf_prog_run32+0x87/0x170 kernel/bpf/core.c:1681
 __bpf_prog_run32+0x87/0x170 kernel/bpf/core.c:1681
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