This is a note to let you know that I've just added the patch titled
wake_up_process() should be never used to wakeup a TASK_STOPPED/TRACED task
to the 3.0-stable tree which can be found at:
http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary
The filename of the patch is:
wake_up_process-should-be-never-used-to-wakeup-a-task_stopped-traced-task.patch
and it can be found in the queue-3.0 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
>From mhocko@xxxxxxx Fri Mar 1 09:06:11 2013
From: Oleg Nesterov <oleg@xxxxxxxxxx>
Date: Tue, 19 Feb 2013 14:56:53 +0100
Subject: wake_up_process() should be never used to wakeup a TASK_STOPPED/TRACED task
To: stable@xxxxxxxxxxxxxxx
Cc: Oleg Nesterov <oleg@xxxxxxxxxx>, Linus Torvalds <torvalds@xxxxxxxxxxxxxxxxxxxx>
Message-ID: <1361282213-17268-3-git-send-email-mhocko@xxxxxxx>
From: Oleg Nesterov <oleg@xxxxxxxxxx>
Upstream commit 9067ac85d533651b98c2ff903182a20cbb361fcb.
wake_up_process() should never wakeup a TASK_STOPPED/TRACED task.
Change it to use TASK_NORMAL and add the WARN_ON().
TASK_ALL has no other users, probably can be killed.
Signed-off-by: Oleg Nesterov <oleg@xxxxxxxxxx>
Signed-off-by: Linus Torvalds <torvalds@xxxxxxxxxxxxxxxxxxxx>
Cc: Michal Hocko <mhocko@xxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
kernel/sched.c | 3 ++-
1 file changed, 2 insertions(+), 1 deletion(-)
--- a/kernel/sched.c
+++ b/kernel/sched.c
@@ -2778,7 +2778,8 @@ out:
*/
int wake_up_process(struct task_struct *p)
{
- return try_to_wake_up(p, TASK_ALL, 0);
+ WARN_ON(task_is_stopped_or_traced(p));
+ return try_to_wake_up(p, TASK_NORMAL, 0);
}
EXPORT_SYMBOL(wake_up_process);
Patches currently in stable-queue which might be from oleg@xxxxxxxxxx are
queue-3.0/ptrace-introduce-signal_wake_up_state-and-ptrace_signal_wake_up.patch
queue-3.0/ptrace-ensure-arch_ptrace-ptrace_request-can-never-race-with-sigkill.patch
queue-3.0/wake_up_process-should-be-never-used-to-wakeup-a-task_stopped-traced-task.patch
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