Hi there,
currently, the aarch64 clone() system call requires the stack to be
aligned at a 16 byte boundary, see arch/arm64/kernel/process.c,
copy_thread():
if (stack_start) {
if (is_compat_thread(task_thread_info(p)))
childregs->compat_sp = stack_start;
/* 16-byte aligned stack mandatory on AArch64 */
else if (stack_start & 15)
return -EINVAL;
else
childregs->sp = stack_start;
}
..and returns -EINVAL if not aligned correctly. This should be added to
the manual page clone(2) as it took me a while to figure out why clone()
was failing with -EINVAL for aarch64 but not on x86.
Colin
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