audit: type=1404 audit(1528826560.014:2): selinux=0 auid=4294967295 ses=4294967295
stty (2157) used greatest stack depth: 56040 bytes left
EXT4-fs (sda1): re-mounted. Opts: (null)
logsave (3796) used greatest stack depth: 55440 bytes left
random: dd: uninitialized urandom read (512 bytes read)
BUG: KMSAN: uninit-value in receive_mergeable drivers/net/virtio_net.c:817 [inline]
BUG: KMSAN: uninit-value in receive_buf+0x324e/0x6ae0 drivers/net/virtio_net.c:917
CPU: 0 PID: 0 Comm: swapper/0 Not tainted 4.17.0+ #4
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
Call Trace:
 <IRQ>
 __dump_stack lib/dump_stack.c:77 [inline]
 dump_stack+0x185/0x1d0 lib/dump_stack.c:113
 kmsan_report+0x188/0x2a0 mm/kmsan/kmsan.c:1117
 __msan_warning_32+0x70/0xc0 mm/kmsan/kmsan_instr.c:620
 receive_mergeable drivers/net/virtio_net.c:817 [inline]
 receive_buf+0x324e/0x6ae0 drivers/net/virtio_net.c:917
 virtnet_receive drivers/net/virtio_net.c:1200 [inline]
 virtnet_poll+0xac2/0x1540 drivers/net/virtio_net.c:1286
 napi_poll net/core/dev.c:5735 [inline]
 net_rx_action+0x766/0x1a80 net/core/dev.c:5801
 </IRQ>
RIP: 0010:native_safe_halt arch/x86/include/asm/irqflags.h:55 [inline]
RIP: 0010:arch_safe_halt arch/x86/include/asm/irqflags.h:97 [inline]
RIP: 0010:default_idle+0x20b/0x3e0 arch/x86/kernel/process.c:500
RAX: ffff8801fd432f18 RBX: 0000000000000000 RCX: ffff880000000000
RBP: ffffffff8ac0fdc8 R08: 0000000001080020 R09: 0000000000000002
R13: ffffffff8ac372c0 R14: ffffffff8ac0fe2c R15: ffffffff8ac37b98
 arch_cpu_idle+0x26/0x30 arch/x86/kernel/process.c:491
 default_idle_call kernel/sched/idle.c:93 [inline]
 cpuidle_idle_call kernel/sched/idle.c:153 [inline]
 do_idle+0x36d/0x830 kernel/sched/idle.c:262
 cpu_startup_entry+0x45/0x50 kernel/sched/idle.c:368
 rest_init+0x1c1/0x1f0 init/main.c:443
 start_kernel+0x1110/0x1120 init/main.c:740
 x86_64_start_reservations arch/x86/kernel/head64.c:453 [inline]
 x86_64_start_kernel+0xe4/0xf0 arch/x86/kernel/head64.c:434
 secondary_startup_64+0xa5/0xb0 arch/x86/kernel/head_64.S:242

Uninit was stored to memory at:
 kmsan_save_stack_with_flags mm/kmsan/kmsan.c:279 [inline]
 kmsan_save_stack mm/kmsan/kmsan.c:294 [inline]
 kmsan_internal_chain_origin+0x12b/0x210 mm/kmsan/kmsan.c:685
 __msan_chain_origin+0x69/0xc0 mm/kmsan/kmsan_instr.c:464
 receive_mergeable drivers/net/virtio_net.c:690 [inline]
 receive_buf+0x2dbb/0x6ae0 drivers/net/virtio_net.c:917
 virtnet_receive drivers/net/virtio_net.c:1200 [inline]
 virtnet_poll+0xac2/0x1540 drivers/net/virtio_net.c:1286
 napi_poll net/core/dev.c:5735 [inline]
 net_rx_action+0x766/0x1a80 net/core/dev.c:5801
 __do_softirq+0x592/0x979 kernel/softirq.c:285
Uninit was created at:
 kmsan_save_stack_with_flags mm/kmsan/kmsan.c:279 [inline]
 kmsan_alloc_meta_for_pages+0x161/0x3a0 mm/kmsan/kmsan.c:815
 kmsan_alloc_page+0x82/0xe0 mm/kmsan/kmsan.c:885
 __alloc_pages_nodemask+0xf7b/0x5cc0 mm/page_alloc.c:4402
 alloc_pages_current+0x6b1/0x970 mm/mempolicy.c:2093
 alloc_pages include/linux/gfp.h:494 [inline]
 skb_page_frag_refill+0x3ba/0x5e0 net/core/sock.c:2211
 add_recvbuf_mergeable drivers/net/virtio_net.c:1067 [inline]
 try_fill_recv+0x3d5/0x2580 drivers/net/virtio_net.c:1108
 virtnet_open+0x188/0x600 drivers/net/virtio_net.c:1311
 __dev_open+0x613/0x840 net/core/dev.c:1392
 __dev_change_flags+0x401/0xb60 net/core/dev.c:6955
 dev_change_flags+0xca/0x230 net/core/dev.c:7024
 do_setlink+0x165b/0x6010 net/core/rtnetlink.c:2362
 rtnl_newlink+0x2b33/0x37a0 net/core/rtnetlink.c:2970
 rtnetlink_rcv_msg+0xa44/0x1570 net/core/rtnetlink.c:4646
 netlink_rcv_skb+0x37e/0x600 net/netlink/af_netlink.c:2448
 rtnetlink_rcv+0x50/0x60 net/core/rtnetlink.c:4664
 netlink_unicast_kernel net/netlink/af_netlink.c:1310 [inline]
 netlink_unicast+0x1680/0x1750 net/netlink/af_netlink.c:1336
 netlink_sendmsg+0x104f/0x1350 net/netlink/af_netlink.c:1901
 sock_sendmsg_nosec net/socket.c:629 [inline]
 sock_sendmsg net/socket.c:639 [inline]
 ___sys_sendmsg+0xec8/0x1320 net/socket.c:2117
 __sys_sendmsg net/socket.c:2155 [inline]
 __do_sys_sendmsg net/socket.c:2164 [inline]
 __se_sys_sendmsg net/socket.c:2162 [inline]
 __x64_sys_sendmsg+0x331/0x460 net/socket.c:2162
 do_syscall_64+0x15b/0x230 arch/x86/entry/common.c:287
 entry_SYSCALL_64_after_hwframe+0x44/0xa9
==================================================================