possible kmemleak splat on upstream kernel 
topmost commit 2d6be4abf514fc26c83d239c7f31da1f95e4a31d

unreferenced object 0xffffc90000398000 (size 16384):
  comm "sh", pid 206, jiffies 4294893183 (age 2324.324s)
  hex dump (first 32 bytes):
    9d 6e ac 57 00 00 00 00 00 00 00 00 00 00 00 00  .n.W............
    00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00  ................
  backtrace:
    [<ffffffff81554129>] kmemleak_alloc+0x49/0xa0
    [<ffffffff810ebc15>] __vmalloc_node_range+0x185/0x280
    [<ffffffff81040ee6>] copy_process.part.70+0x4b6/0x1750
    [<ffffffff8104234b>] _do_fork+0xdb/0x2c0
    [<ffffffff810425b4>] SyS_clone+0x14/0x20
    [<ffffffff810011e8>] do_syscall_64+0x48/0xb0
    [<ffffffff81558a46>] return_from_SYSCALL_64+0x0/0x6a
    [<ffffffffffffffff>] 0xffffffffffffffff