Patch "scripts/gdb/linux/tasks.py: fix get_thread_info" has been added to the 4.14-stable tree

This is a note to let you know that I've just added the patch titled

scripts/gdb/linux/tasks.py: fix get_thread_info

to the 4.14-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:
scripts-gdb-linux-tasks.py-fix-get_thread_info.patch
and it can be found in the queue-4.14 subdirectory.

If you, or anyone else, feels it should not be added to the stable tree, please let <[email protected]> know about it.

From: Xi Kangjie <[email protected]>
Date: Thu, 18 Jan 2018 16:34:00 -0800
Subject: scripts/gdb/linux/tasks.py: fix get_thread_info

From: Xi Kangjie <[email protected]>

commit 883d50f56d263f70fd73c0d96b09eb36c34e9305 upstream.

Since kernel 4.9, the thread_info has been moved into task_struct, no longer locates at the bottom of kernel stack.

See commits c65eacbe290b ("sched/core: Allow putting thread_info into task_struct") and 15f4eae70d36 ("x86: Move thread_info into task_struct").

Before fix:
(gdb) set $current = $lx_current()
(gdb) p $lx_thread_info($current)
$1 = {flags = 1470918301}
(gdb) p $current.thread_info
$2 = {flags = 2147483648}

After fix:
(gdb) p $lx_thread_info($current)
$1 = {flags = 2147483648}
(gdb) p $current.thread_info
$2 = {flags = 2147483648}

---
 scripts/gdb/linux/tasks.py |    2 ++
 1 file changed, 2 insertions(+)

@@ -96,6 +96,8 @@ def get_thread_info(task):
         thread_info_addr = task.address + ia64_task_size
         thread_info = thread_info_addr.cast(thread_info_ptr_type)
     else:
+        if task.type.fields()[0].type == thread_info_type.get_type():
+            return task['thread_info']
         thread_info = task['stack'].cast(thread_info_ptr_type)
     return thread_info.dereference()
 

Patches currently in stable-queue which might be from [email protected] are

queue-4.14/scripts-gdb-linux-tasks.py-fix-get_thread_info.patch