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[PATCH RT 02/20] ptrace: dont open IRQs in ptrace_freeze_traced() too early

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3.18.27-rt27-rc1 stable review patch.
If anyone has any objections, please let me know.

------------------

From: Sebastian Andrzej Siewior <bigeasy@linutronix.de>

In the non-RT case the spin_lock_irq() here disables interrupts as well
as raw_spin_lock_irq(). So in the unlock case the interrupts are enabled
too early.

Reported-by: kernel test robot <ying.huang@linux.intel.com>
Cc: stable-rt@vger.kernel.org
Signed-off-by: Sebastian Andrzej Siewior <bigeasy@linutronix.de>
Signed-off-by: Steven Rostedt <rostedt@goodmis.org>
---
 kernel/ptrace.c | 6 ++++--
 1 file changed, 4 insertions(+), 2 deletions(-)

diff --git a/kernel/ptrace.c b/kernel/ptrace.c
index 09d76da725af..ac364db5622b 100644
--- a/kernel/ptrace.c
+++ b/kernel/ptrace.c
@@ -129,12 +129,14 @@ static bool ptrace_freeze_traced(struct task_struct *task)
 
 	spin_lock_irq(&task->sighand->siglock);
 	if (task_is_traced(task) && !__fatal_signal_pending(task)) {
-		raw_spin_lock_irq(&task->pi_lock);
+		unsigned long flags;
+
+		raw_spin_lock_irqsave(&task->pi_lock, flags);
 		if (task->state & __TASK_TRACED)
 			task->state = __TASK_TRACED;
 		else
 			task->saved_state = __TASK_TRACED;
-		raw_spin_unlock_irq(&task->pi_lock);
+		raw_spin_unlock_irqrestore(&task->pi_lock, flags);
 		ret = true;
 	}
 	spin_unlock_irq(&task->sighand->siglock);
-- 
2.7.0

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[PATCH RT 02/20] ptrace: dont open IRQs in ptrace_freeze_traced() too early Steven Rostedt <rostedt@goodmis.org> - 2016-03-02 16:50 +0100

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