===================================================== BUG: KMSAN: uninit-value in __netif_receive_skb_core+0x38f3/0x5870 net/core/dev.c:5111 CPU: 1 PID: 9924 Comm: syz-executor.1 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 __netif_receive_skb_core+0x38f3/0x5870 net/core/dev.c:5111 __netif_receive_skb_one_core net/core/dev.c:5186 [inline] __netif_receive_skb net/core/dev.c:5302 [inline] process_backlog+0x936/0x1410 net/core/dev.c:6134 napi_poll net/core/dev.c:6572 [inline] net_rx_action+0x786/0x1aa0 net/core/dev.c:6640 __do_softirq+0x311/0x83d kernel/softirq.c:293 do_softirq_own_stack+0x49/0x80 arch/x86/entry/entry_64.S:1091 do_softirq kernel/softirq.c:338 [inline] __local_bh_enable_ip+0x184/0x1d0 kernel/softirq.c:190 local_bh_enable+0x36/0x40 include/linux/bottom_half.h:32 rcu_read_unlock_bh include/linux/rcupdate.h:690 [inline] __dev_queue_xmit+0x338e/0x3b20 net/core/dev.c:4079 dev_queue_xmit+0x4b/0x60 net/core/dev.c:4085 packet_snd net/packet/af_packet.c:2979 [inline] packet_sendmsg+0x8347/0x93b0 net/packet/af_packet.c:3004 sock_sendmsg_nosec net/socket.c:652 [inline] sock_sendmsg net/socket.c:672 [inline] kernel_sendmsg+0x433/0x440 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] do_splice+0x1eae/0x2ec0 fs/splice.c:1170 __do_sys_splice fs/splice.c:1447 [inline] __se_sys_splice+0x426/0x520 fs/splice.c:1427 __x64_sys_splice+0x6e/0x90 fs/splice.c:1427 do_syscall_64+0xb8/0x160 arch/x86/entry/common.c:297 entry_SYSCALL_64_after_hwframe+0x44/0xa9 RIP: 0033:0x45cba9 Code: 8d b6 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 5b b6 fb ff c3 66 2e 0f 1f 84 00 00 00 00 RSP: 002b:00007f4917917c78 EFLAGS: 00000246 ORIG_RAX: 0000000000000113 RAX: ffffffffffffffda RBX: 000000000050a300 RCX: 000000000045cba9 RDX: 0000000000000006 RSI: 0000000000000000 RDI: 0000000000000003 RBP: 000000000078bf00 R08: 0000000080000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 00000000ffffffff R13: 0000000000000c18 R14: 00000000004cf0e2 R15: 00007f49179186d4 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 vlan_set_encap_proto include/linux/if_vlan.h:641 [inline] skb_vlan_untag+0x9a2/0xdb0 net/core/skbuff.c:5433 __netif_receive_skb_core+0x700/0x5870 net/core/dev.c:5033 __netif_receive_skb_one_core net/core/dev.c:5186 [inline] __netif_receive_skb net/core/dev.c:5302 [inline] process_backlog+0x936/0x1410 net/core/dev.c:6134 napi_poll net/core/dev.c:6572 [inline] net_rx_action+0x786/0x1aa0 net/core/dev.c:6640 __do_softirq+0x311/0x83d kernel/softirq.c:293 Uninit was created at: kmsan_save_stack_with_flags mm/kmsan/kmsan.c:144 [inline] kmsan_internal_poison_shadow+0x66/0xd0 mm/kmsan/kmsan.c:127 kmsan_slab_alloc+0x8a/0xe0 mm/kmsan/kmsan_hooks.c:80 slab_alloc_node mm/slub.c:2802 [inline] __kmalloc_node_track_caller+0xb40/0x1200 mm/slub.c:4436 __kmalloc_reserve net/core/skbuff.c:142 [inline] __alloc_skb+0x2fd/0xac0 net/core/skbuff.c:210 alloc_skb include/linux/skbuff.h:1083 [inline] alloc_skb_with_frags+0x18c/0xa70 net/core/skbuff.c:5772 sock_alloc_send_pskb+0xada/0xc60 net/core/sock.c:2265 packet_alloc_skb net/packet/af_packet.c:2827 [inline] packet_snd net/packet/af_packet.c:2922 [inline] packet_sendmsg+0x66a0/0x93b0 net/packet/af_packet.c:3004 sock_sendmsg_nosec net/socket.c:652 [inline] sock_sendmsg net/socket.c:672 [inline] kernel_sendmsg+0x433/0x440 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] do_splice+0x1eae/0x2ec0 fs/splice.c:1170 __do_sys_splice fs/splice.c:1447 [inline] __se_sys_splice+0x426/0x520 fs/splice.c:1427 __x64_sys_splice+0x6e/0x90 fs/splice.c:1427 do_syscall_64+0xb8/0x160 arch/x86/entry/common.c:297 entry_SYSCALL_64_after_hwframe+0x44/0xa9 =====================================================