perf_event_open(&(0x7f0000000280)={0x1, 0x80, 0x0, 0x0, 0x0, 0x0, 0x0, 0x2, 0x80, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, @perf_config_ext, 0x0, 0x0, 0xffffffff}, 0x0, 0xffffffffffffffff, 0xffffffffffffffff, 0x0)
fork() (fail_nth: 28)
BUG: memory leak
unreferenced object 0xffff8880434f0800 (size 256):
  comm "syz-executor.3", pid 125810, jiffies 4298185505 (age 26.659s)
  hex dump (first 32 bytes):
    01 00 00 00 00 00 00 00 00 00 00 00 06 00 00 00  ................
    00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00  ................
  backtrace:
    [<00000000b87acfeb>] mas_alloc_nodes+0x36e/0x6a0
    [<0000000003a4f16d>] mas_node_count_gfp+0x106/0x140
    [<00000000cc398af5>] mas_expected_entries+0x111/0x1c0
    [<00000000ed61fe66>] dup_mmap+0x41f/0xf40
    [<00000000c7032db9>] dup_mm+0x91/0x380
    [<0000000004f9fc45>] copy_process+0x5e27/0x6dd0
    [<00000000d47133ac>] kernel_clone+0xe7/0xa60
    [<0000000055c2aa5b>] __do_sys_fork+0x7c/0xb0
    [<000000006beb9bf0>] do_syscall_64+0x3b/0x90
    [<00000000f1e27d64>] entry_SYSCALL_64_after_hwframe+0x63/0xcd

BUG: leak checking failed