mm_update_next_owner() call from exit_mm() , and exit_mm() change tsk->mm to NULL If p==c , It seems to be impossible that mm == c->mm (tsk->mm) . Because mm is non-NULL and c->mm is NULL .
-----Original Message----- From: Peter Chiang [mailto:[email protected]] Sent: Wednesday, April 16, 2014 11:03 AM To: [email protected]; Peter Chiang; [email protected]; [email protected]; [email protected]; [email protected]; [email protected]; [email protected]; [email protected] Cc: [email protected] Subject: [PATCH] mm : Avoid candidate task is equal to current task From: pchiang <[email protected]> Fix kernel panic when finding a new owner for the mm and the new owner is equal to current onwer Signed-off-by: pchiang <[email protected]> --- kernel/exit.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/kernel/exit.c b/kernel/exit.c index 6ed6a1d..aa98422 100644 --- a/kernel/exit.c +++ b/kernel/exit.c @@ -399,7 +399,7 @@ retry: * here often */ do_each_thread(g, c) { - if (c->mm == mm) + if ((c != p) && (c->mm == mm)) goto assign_new_owner; } while_each_thread(g, c); -- 1.8.1.5 -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to [email protected] More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
