On 04/25, Oleg Nesterov wrote:
>
> - if (ACTIVE() && !INSTACK(esp, bt)) {
> + if (LOCAL_ACTIVE() && !INSTACK(esp, bt)) {
Of course, this is wrong, please see v2 below.
-------------------------------------------------------------------------------
Subject: [PATCH v2 03/10] back_trace: don't check /proc if !LOCAL_ACTIVE()
Obviously the /proc/$tc->pid check can only make sense if LOCAL_ACTIVE().
Signed-off-by: Oleg Nesterov <oleg@xxxxxxxxxx>
---
kernel.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/kernel.c b/kernel.c
index a6fa7a6..cf0a6a0 100644
--- a/kernel.c
+++ b/kernel.c
@@ -2902,7 +2902,7 @@ back_trace(struct bt_info *bt)
if (ACTIVE() && !INSTACK(esp, bt)) {
sprintf(buf, "/proc/%ld", bt->tc->pid);
- if (!file_exists(buf, NULL))
+ if (!(LOCAL_ACTIVE() && file_exists(buf, NULL)))
error(INFO, "task no longer exists\n");
else
error(INFO,
--
2.5.0
--
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