[lkml]   [2013]   [Dec]   [10]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
Messages in this thread
SubjectRe: process 'stuck' at exit.
On Tue, Dec 10, 2013 at 1:41 PM, Dave Jones <> wrote:

Hmm. Ok, so something is calling [__]get_user_pages_fast() and
put_page() in a loop, but the trace doesn't show what that "something"
is, because it is itself not ever called.

However, that pattern does seem to imply that the loop is in
get_futex_key(), because all the other loops I see seem to be calling
other things as well.

And the __get_user_pages_fast() call implies that it's the THP case
that triggers the "unlikely(PageTail(page))" case. And anyway,
otherwise we'd see lock_page()/unlock_page() too.

So it looks like __get_user_pages_fast() fails, and keeps failing.
Andrea, this is your code, any ideas? Commit a5b338f2b0b1f ("thp:
update futex compound knowledge") to be exact.


 \ /
  Last update: 2013-12-10 23:21    [W:0.225 / U:0.264 seconds]
©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site