This is a note to let you know that I've just added the patch titled
driver/base/node: remove unnecessary kfree of node struct from unregister_one_node
to the 3.16-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:
driver-base-node-remove-unnecessary-kfree-of-node-struct-from-unregister_one_node.patch
and it can be found in the queue-3.16 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
>From 33ead538f642a33b1d658782a5d14a40b5014d1f Mon Sep 17 00:00:00 2001
From: Yasuaki Ishimatsu <isimatu.yasuaki@xxxxxxxxxxxxxx>
Date: Fri, 3 Oct 2014 19:06:03 +0900
Subject: driver/base/node: remove unnecessary kfree of node struct from unregister_one_node
From: Yasuaki Ishimatsu <isimatu.yasuaki@xxxxxxxxxxxxxx>
commit 33ead538f642a33b1d658782a5d14a40b5014d1f upstream.
Commit 92d585ef067d ("numa: fix NULL pointer access and memory
leak in unregister_one_node()") added kfree() of node struct in
unregister_one_node(). But node struct is freed by node_device_release()
which is called in unregister_node(). So by adding the kfree(),
node struct is freed two times.
While hot removing memory, the commit leads the following BUG_ON():
kernel BUG at mm/slub.c:3346!
invalid opcode: 0000 [#1] SMP
[...]
Call Trace:
[...] unregister_one_node
[...] try_offline_node
[...] remove_memory
[...] acpi_memory_device_remove
[...] acpi_bus_trim
[...] acpi_bus_trim
[...] acpi_device_hotplug
[...] acpi_hotplug_work_fn
[...] process_one_work
[...] worker_thread
[...] ? rescuer_thread
[...] kthread
[...] ? kthread_create_on_node
[...] ret_from_fork
[...] ? kthread_create_on_node
This patch removes unnecessary kfree() from unregister_one_node().
Signed-off-by: Yasuaki Ishimatsu <isimatu.yasuaki@xxxxxxxxxxxxxx>
Cc: Xishi Qiu <qiuxishi@xxxxxxxxxx>
Fixes: 92d585ef067d "numa: fix NULL pointer access and memory leak in unregister_one_node()"
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
drivers/base/node.c | 1 -
1 file changed, 1 deletion(-)
--- a/drivers/base/node.c
+++ b/drivers/base/node.c
@@ -603,7 +603,6 @@ void unregister_one_node(int nid)
return;
unregister_node(node_devices[nid]);
- kfree(node_devices[nid]);
node_devices[nid] = NULL;
}
Patches currently in stable-queue which might be from isimatu.yasuaki@xxxxxxxxxxxxxx are
queue-3.16/driver-base-node-remove-unnecessary-kfree-of-node-struct-from-unregister_one_node.patch
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