This is a note to let you know that I've just added the patch titled
mm, meminit: always return a valid node from early_pfn_to_nid
to the 4.4-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:
mm-meminit-always-return-a-valid-node-from-early_pfn_to_nid.patch
and it can be found in the queue-4.4 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
>From e4568d3803852d00effd41dcdd489e726b998879 Mon Sep 17 00:00:00 2001
From: Mel Gorman <mgorman@xxxxxxxxxxxxxxxxxxx>
Date: Thu, 14 Jul 2016 12:07:20 -0700
Subject: mm, meminit: always return a valid node from early_pfn_to_nid
From: Mel Gorman <mgorman@xxxxxxxxxxxxxxxxxxx>
commit e4568d3803852d00effd41dcdd489e726b998879 upstream.
early_pfn_to_nid can return node 0 if a PFN is invalid on machines that
has no node 0. A machine with only node 1 was observed to crash with
the following message:
BUG: unable to handle kernel paging request at 000000000002a3c8
PGD 0
Modules linked in:
Hardware name: Supermicro H8DSP-8/H8DSP-8, BIOS 080011 06/30/2006
task: ffffffff81c0d500 ti: ffffffff81c00000 task.ti: ffffffff81c00000
RIP: reserve_bootmem_region+0x6a/0xef
CR2: 000000000002a3c8 CR3: 0000000001c06000 CR4: 00000000000006b0
Call Trace:
free_all_bootmem+0x4b/0x12a
mem_init+0x70/0xa3
start_kernel+0x25b/0x49b
The problem is that early_page_uninitialised uses the early_pfn_to_nid
helper which returns node 0 for invalid PFNs. No caller of
early_pfn_to_nid cares except early_page_uninitialised. This patch has
early_pfn_to_nid always return a valid node.
Link: http://lkml.kernel.org/r/1468008031-3848-3-git-send-email-mgorman@xxxxxxxxxxxxxxxxxxx
Signed-off-by: Mel Gorman <mgorman@xxxxxxxxxxxxxxxxxxx>
Acked-by: David Rientjes <rientjes@xxxxxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
Signed-off-by: Linus Torvalds <torvalds@xxxxxxxxxxxxxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
mm/page_alloc.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
--- a/mm/page_alloc.c
+++ b/mm/page_alloc.c
@@ -1057,7 +1057,7 @@ int __meminit early_pfn_to_nid(unsigned
spin_lock(&early_pfn_lock);
nid = __early_pfn_to_nid(pfn, &early_pfnnid_cache);
if (nid < 0)
- nid = 0;
+ nid = first_online_node;
spin_unlock(&early_pfn_lock);
return nid;
Patches currently in stable-queue which might be from mgorman@xxxxxxxxxxxxxxxxxxx are
queue-4.4/mm-compaction-abort-free-scanner-if-split-fails.patch
queue-4.4/mm-compaction-prevent-vm_bug_on-when-terminating-freeing-scanner.patch
queue-4.4/mm-meminit-always-return-a-valid-node-from-early_pfn_to_nid.patch
queue-4.4/mm-meminit-ensure-node-is-online-before-checking-whether-pages-are-uninitialised.patch
queue-4.4/mm-slb-add-__gfp_atomic-to-the-gfp-reclaim-mask.patch
--
To unsubscribe from this list: send the line "unsubscribe stable" in
the body of a message to majordomo@xxxxxxxxxxxxxxx
More majordomo info at http://vger.kernel.org/majordomo-info.html