"Search through everything else" in mm_update_next_owner() can
hit a kthread which adopted this "mm" via use_mm(), it should
not be used as mm->owner. Add the PF_KTHREAD check.
While at it, change this code to use for_each_process_thread()
instead of deprecated do_each_thread/while_each_thread.
Signed-off-by: Oleg Nesterov <o...@redhat.com>
Reviewed-by: Michal Hocko <mho...@suse.cz>
---
kernel/exit.c | 10 ++++------
1 files changed, 4 insertions(+), 6 deletions(-)
diff --git a/kernel/exit.c b/kernel/exit.c
index ad7183a..e270d2a 100644
--- a/kernel/exit.c
+++ b/kernel/exit.c
@@ -356,14 +356,12 @@ retry:
}
/*
- * Search through everything else. We should not get
- * here often
+ * Search through everything else, we should not get here often.
*/
- do_each_thread(g, c) {
- if (c->mm == mm)
+ for_each_process_thread(g, c) {
+ if (!(c->flags & PF_KTHREAD) && c->mm == mm)
goto assign_new_owner;
- } while_each_thread(g, c);
-
+ }
read_unlock(&tasklist_lock);
/*
* We found no owner yet mm_users > 1: this implies that we are
--
1.5.5.1
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