c - Invalid Argument error when using clone() -

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i'm using function call clone()

clone (fun, (char*)stack + 0x500000, sigchld | clone_files | clone_fs, arg);

where fun function: int fun(void*), stack = malloc (0x500000), , arg of type void*.

i'm wondering other possible causes invalid argument perror.

i have checked stack not null.

man clone:

   child_stack  argument  specifies location of stack used    child process.  since child , calling process may share  mem‐    ory,    not possible child process execute in same    stack calling process.  calling process must  therefore  set    memory space child stack , pass pointer space    clone().  stacks grow downward on processors run linux (except     hp  pa  processors),  child_stack points topmost    address of memory space set child stack.

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