3.14.61-rt64-rc1 stable review patch. If anyone has any objections, please let me know.
------------------ From: Sebastian Andrzej Siewior <[email protected]> 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 <[email protected]> Cc: [email protected] Signed-off-by: Sebastian Andrzej Siewior <[email protected]> Signed-off-by: Steven Rostedt <[email protected]> --- kernel/ptrace.c | 6 ++++-- 1 file changed, 4 insertions(+), 2 deletions(-) diff --git a/kernel/ptrace.c b/kernel/ptrace.c index c8cd8ffab511..fe11653fb005 100644 --- a/kernel/ptrace.c +++ b/kernel/ptrace.c @@ -135,12 +135,14 @@ 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
