Re: process 'stuck' at exit.

[Oleg Nesterov]

On 12/10, Linus Torvalds wrote:
>
> So it looks like __get_user_pages_fast() fails, and keeps failing.

And "again:" does get_user_pages_fast().

And according to this trace get_user_pages_fast() takes mmap_sem
and calls __get_user_pages().

But __get_user_pages() should fail even before follow_page_mask()
due to fatal_signal_pending(), in this case get_futex_key() should
return the error. is_vm_hugetlb_page(vma).

So it seems that this is not THP but VM_HUGETLB and
follow_hugetlb_page() succeeds every time?

Oleg.

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