===================================================== BUG: KMSAN: uninit-value in virtio_net_hdr_to_skb+0x1414/0x14f0 include/linux/virtio_net.h:86 CPU: 0 PID: 30440 Comm: syz-executor.3 Tainted: G W 5.12.0-rc6-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 Call Trace: __dump_stack lib/dump_stack.c:79 [inline] dump_stack+0x24c/0x2e0 lib/dump_stack.c:120 kmsan_report+0xfb/0x1e0 mm/kmsan/kmsan_report.c:121 __msan_warning+0x5c/0xa0 mm/kmsan/kmsan_instr.c:197 virtio_net_hdr_to_skb+0x1414/0x14f0 include/linux/virtio_net.h:86 packet_snd net/packet/af_packet.c:2994 [inline] packet_sendmsg+0x85b8/0x99d0 net/packet/af_packet.c:3031 sock_sendmsg_nosec net/socket.c:654 [inline] sock_sendmsg net/socket.c:674 [inline] sock_write_iter+0x585/0x680 net/socket.c:1001 call_write_iter include/linux/fs.h:1977 [inline] new_sync_write fs/read_write.c:518 [inline] vfs_write+0x1083/0x1b00 fs/read_write.c:605 ksys_write+0x275/0x500 fs/read_write.c:658 __do_sys_write fs/read_write.c:670 [inline] __se_sys_write+0x92/0xb0 fs/read_write.c:667 __ia32_sys_write+0x4a/0x70 fs/read_write.c:667 do_syscall_32_irqs_on arch/x86/entry/common.c:79 [inline] __do_fast_syscall_32+0x127/0x180 arch/x86/entry/common.c:142 do_fast_syscall_32+0x77/0xd0 arch/x86/entry/common.c:168 do_SYSENTER_32+0x73/0x90 arch/x86/entry/common.c:211 entry_SYSENTER_compat_after_hwframe+0x4d/0x5c RIP: 0023:0xf7f41549 Code: 03 74 c0 01 10 05 03 74 b8 01 10 06 03 74 b4 01 10 07 03 74 b0 01 10 08 03 74 d8 01 00 00 00 00 00 51 52 55 89 e5 0f 34 cd 80 <5d> 5a 59 c3 90 90 90 90 8d b4 26 00 00 00 00 8d b4 26 00 00 00 00 RSP: 002b:00000000f553b5fc EFLAGS: 00000296 ORIG_RAX: 0000000000000004 RAX: ffffffffffffffda RBX: 0000000000000004 RCX: 0000000020000100 RDX: 0000000000000139 RSI: 0000000000000000 RDI: 0000000000000000 RBP: 0000000000000000 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000000 R12: 0000000000000000 R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000000000 Uninit was created at: kmsan_save_stack_with_flags+0x3c/0x90 mm/kmsan/kmsan.c:120 kmsan_alloc_page+0xd0/0x1e0 mm/kmsan/kmsan_shadow.c:273 __alloc_pages_nodemask+0x827/0xf90 mm/page_alloc.c:5044 alloc_pages_current+0x7b6/0xb60 mm/mempolicy.c:2277 alloc_pages include/linux/gfp.h:561 [inline] alloc_slab_page mm/slub.c:1653 [inline] allocate_slab+0x364/0x1260 mm/slub.c:1793 new_slab mm/slub.c:1856 [inline] new_slab_objects mm/slub.c:2602 [inline] ___slab_alloc+0xd42/0x1930 mm/slub.c:2765 __slab_alloc mm/slub.c:2805 [inline] slab_alloc_node mm/slub.c:2886 [inline] slab_alloc mm/slub.c:2931 [inline] kmem_cache_alloc+0xc68/0x1030 mm/slub.c:2936 __nf_conntrack_alloc+0x1b4/0x740 net/netfilter/nf_conntrack_core.c:1498 init_conntrack+0x27d/0x2210 net/netfilter/nf_conntrack_core.c:1577 resolve_normal_ct net/netfilter/nf_conntrack_core.c:1675 [inline] nf_conntrack_in+0xc7b/0x296d net/netfilter/nf_conntrack_core.c:1830 ipv4_conntrack_local+0x225/0x3b0 net/netfilter/nf_conntrack_proto.c:200 nf_hook_entry_hookfn include/linux/netfilter.h:136 [inline] nf_hook_slow+0x17b/0x460 net/netfilter/core.c:589 nf_hook include/linux/netfilter.h:256 [inline] __ip_local_out+0x78c/0x840 net/ipv4/ip_output.c:115 ip_local_out net/ipv4/ip_output.c:124 [inline] __ip_queue_xmit+0x1d5b/0x23b0 net/ipv4/ip_output.c:533 ip_queue_xmit+0xcc/0xf0 net/ipv4/ip_output.c:547 __tcp_transmit_skb+0x4c59/0x5ea0 net/ipv4/tcp_output.c:1405 tcp_transmit_skb net/ipv4/tcp_output.c:1423 [inline] tcp_connect+0x104d/0x3d40 net/ipv4/tcp_output.c:3856 tcp_v4_connect+0x255c/0x26f0 net/ipv4/tcp_ipv4.c:312 __inet_stream_connect+0x8bf/0x1780 net/ipv4/af_inet.c:664 inet_stream_connect+0x101/0x180 net/ipv4/af_inet.c:728 rds_tcp_conn_path_connect+0x9e1/0xd30 net/rds/tcp_connect.c:172 rds_connect_worker+0x3ba/0x5b0 net/rds/threads.c:176 process_one_work+0x1219/0x1fe0 kernel/workqueue.c:2275 worker_thread+0x10ec/0x2340 kernel/workqueue.c:2421 kthread+0x521/0x560 kernel/kthread.c:292 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:294 =====================================================