The patch titled
Subject: ptrace: task_stopped_code(ptrace => true) can't see TASK_STOPPED task
has been added to the -mm tree. Its filename is
ptrace-task_stopped_codeptrace-=-true-cant-see-task_stopped-task.patch
This patch should soon appear at
http://ozlabs.org/~akpm/mmots/broken-out/ptrace-task_stopped_codeptrace-%3D-true-cant-see-task_stopped-task.patch
and later at
http://ozlabs.org/~akpm/mmotm/broken-out/ptrace-task_stopped_codeptrace-%3D-true-cant-see-task_stopped-task.patch
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------------------------------------------------------
From: Oleg Nesterov <oleg@xxxxxxxxxx>
Subject: ptrace: task_stopped_code(ptrace => true) can't see TASK_STOPPED task
task_stopped_code()->task_is_stopped_or_traced() doesn't look right, the
traced task must never be TASK_STOPPED.
We can not add WARN_ON(task_is_stopped(p)), but this is only because
do_wait() can race with PTRACE_ATTACH from another thread.
Signed-off-by: Oleg Nesterov <oleg@xxxxxxxxxx>
Cc: Andrey Ryabinin <aryabinin@xxxxxxxxxxxxx>
Cc: Roland McGrath <roland@xxxxxxxxxxxxx>
Cc: Tejun Heo <tj@xxxxxxxxxx>
Cc: Pedro Alves <palves@xxxxxxxxxx>
Cc: Jan Kratochvil <jan.kratochvil@xxxxxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
---
kernel/exit.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
diff -puN kernel/exit.c~ptrace-task_stopped_codeptrace-=-true-cant-see-task_stopped-task kernel/exit.c
--- a/kernel/exit.c~ptrace-task_stopped_codeptrace-=-true-cant-see-task_stopped-task
+++ a/kernel/exit.c
@@ -1120,7 +1120,7 @@ static int wait_task_zombie(struct wait_
static int *task_stopped_code(struct task_struct *p, bool ptrace)
{
if (ptrace) {
- if (task_is_stopped_or_traced(p) &&
+ if (task_is_traced(p) &&
!(p->jobctl & JOBCTL_LISTENING))
return &p->exit_code;
} else {
_
Patches currently in -mm which might be from oleg@xxxxxxxxxx are
ptrace-make-wait_on_bitjobctl_trapping_bit-in-ptrace_attach-killable.patch
ptrace-task_stopped_codeptrace-=-true-cant-see-task_stopped-task.patch
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