audit: type=1404 audit(1528826554.553:2): selinux=0 auid=4294967295 ses=4294967295
EXT4-fs (sda1): re-mounted. Opts: (null)
logsave (3753) 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: 2166 Comm: startpar 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
 __do_softirq+0x592/0x979 kernel/softirq.c:285
 invoke_softirq kernel/softirq.c:365 [inline]
 irq_exit+0x202/0x240 kernel/softirq.c:405
 exiting_irq+0xe/0x10 arch/x86/include/asm/apic.h:525
 do_IRQ+0x17d/0x1c0 arch/x86/kernel/irq.c:264
 common_interrupt+0xf/0xf arch/x86/entry/entry_64.S:642
 </IRQ>
RIP: 0010:kstat_irqs_usr+0xc/0x350 kernel/irq/irqdesc.c:937
RSP: 0018:ffff8801cb46f738 EFLAGS: 00000293 ORIG_RAX: ffffffffffffffd8
RAX: ffffffff820099a5 RBX: 000000000000016c RCX: ffff8801d22dd7c0
RDX: 0000000000000000 RSI: aaaaaaaaaaaab000 RDI: 000000000000016c
RBP: ffff8801cb46f758 R08: 0000000001080000 R09: 0000000000000001
R10: 0000000000000000 R11: 0000000000000001 R12: 0000000000000000
R13: ffff8801d22de098 R14: 00000000000001b8 R15: 0000000000000040
 show_stat+0x27ba/0x2d70 fs/proc/stat.c:161
 seq_read+0xc75/0x2270 fs/seq_file.c:240
 proc_reg_read+0x1e3/0x2f0 fs/proc/inode.c:230
 __vfs_read+0x1b2/0x9d0 fs/read_write.c:416
 vfs_read+0x36c/0x6b0 fs/read_write.c:452
 ksys_read fs/read_write.c:578 [inline]
 __do_sys_read fs/read_write.c:588 [inline]
 __se_sys_read fs/read_write.c:586 [inline]
 __x64_sys_read+0x1bf/0x3e0 fs/read_write.c:586
 do_syscall_64+0x15b/0x230 arch/x86/entry/common.c:287
 entry_SYSCALL_64_after_hwframe+0x44/0xa9
RIP: 0033:0x7fe9bde79310
RSP: 002b:00007ffe0be4b138 EFLAGS: 00000246 ORIG_RAX: 0000000000000000
RAX: ffffffffffffffda RBX: 00000000016616d0 RCX: 00007fe9bde79310
RDX: 0000000000000400 RSI: 00007fe9be350000 RDI: 0000000000000004
RBP: 00000000000007ff R08: 00000000ffffffff R09: 0000000000000000
R10: 0000000000000022 R11: 0000000000000246 R12: 000000000000000a
R13: 0000000000000000 R14: 0000000000000000 R15: 00007ffe0be4b1f0

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
==================================================================