BUG: memory leak
unreferenced object 0xffff888108c250c0 (size 32):
  comm "syz-executor.4", pid 7048, jiffies 4294944084 (age 12.360s)
  hex dump (first 32 bytes):
    00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00  ................
    01 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00  ................
  backtrace:
    [<00000000813416ea>] kmemleak_alloc_recursive include/linux/kmemleak.h:43 [inline]
    [<00000000813416ea>] slab_post_alloc_hook mm/slab.h:586 [inline]
    [<00000000813416ea>] slab_alloc mm/slab.c:3319 [inline]
    [<00000000813416ea>] kmem_cache_alloc_trace+0x145/0x2c0 mm/slab.c:3548
    [<00000000d452807a>] kmalloc include/linux/slab.h:556 [inline]
    [<00000000d452807a>] kzalloc include/linux/slab.h:690 [inline]
    [<00000000d452807a>] net_alloc net/core/net_namespace.c:416 [inline]
    [<00000000d452807a>] copy_net_ns+0xb2/0x220 net/core/net_namespace.c:463
    [<0000000054d1dafc>] create_new_namespaces+0x141/0x2a0 kernel/nsproxy.c:103
    [<00000000bf6313b0>] unshare_nsproxy_namespaces+0x7f/0x100 kernel/nsproxy.c:202
    [<000000005567be68>] ksys_unshare+0x237/0x490 kernel/fork.c:2827
    [<0000000050ebb1ef>] __do_sys_unshare kernel/fork.c:2895 [inline]
    [<0000000050ebb1ef>] __se_sys_unshare kernel/fork.c:2893 [inline]
    [<0000000050ebb1ef>] __x64_sys_unshare+0x16/0x20 kernel/fork.c:2893
    [<0000000048717e66>] do_syscall_64+0x73/0x1f0 arch/x86/entry/common.c:290
    [<00000000e24189a6>] entry_SYSCALL_64_after_hwframe+0x44/0xa9