[lkml]   [2019]   [Jan]   [29]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
Messages in this thread
Patch in this message
Subject[PATCH 4.19 101/103] Revert "mm, memory_hotplug: initialize struct pages for the full memory section"
4.19-stable review patch.  If anyone has any objections, please let me know.


From: Michal Hocko <>

commit 4aa9fc2a435abe95a1e8d7f8c7b3d6356514b37a upstream.

This reverts commit 2830bf6f05fb3e05bc4743274b806c821807a684.

The underlying assumption that one sparse section belongs into a single
numa node doesn't hold really. Robert Shteynfeld has reported a boot
failure. The boot log was not captured but his memory layout is as

Early memory node ranges
node 1: [mem 0x0000000000001000-0x0000000000090fff]
node 1: [mem 0x0000000000100000-0x00000000dbdf8fff]
node 1: [mem 0x0000000100000000-0x0000001423ffffff]
node 0: [mem 0x0000001424000000-0x0000002023ffffff]

This means that node0 starts in the middle of a memory section which is
also in node1. memmap_init_zone tries to initialize padding of a
section even when it is outside of the given pfn range because there are
code paths (e.g. memory hotplug) which assume that the full worth of
memory section is always initialized.

In this particular case, though, such a range is already intialized and
most likely already managed by the page allocator. Scribbling over
those pages corrupts the internal state and likely blows up when any of
those pages gets used.

Reported-by: Robert Shteynfeld <>
Fixes: 2830bf6f05fb ("mm, memory_hotplug: initialize struct pages for the full memory section")
Signed-off-by: Michal Hocko <>
Signed-off-by: Linus Torvalds <>
Signed-off-by: Greg Kroah-Hartman <>

mm/page_alloc.c | 12 ------------
1 file changed, 12 deletions(-)

--- a/mm/page_alloc.c
+++ b/mm/page_alloc.c
@@ -5538,18 +5538,6 @@ not_early:
- /*
- * If the zone does not span the rest of the section then
- * we should at least initialize those pages. Otherwise we
- * could blow up on a poisoned page in some paths which depend
- * on full sections being initialized (e.g. memory hotplug).
- */
- while (end_pfn % PAGES_PER_SECTION) {
- __init_single_page(pfn_to_page(end_pfn), end_pfn, zone, nid);
- end_pfn++;
- }

static void __meminit zone_init_free_lists(struct zone *zone)

 \ /
  Last update: 2019-01-29 12:47    [W:0.279 / U:2.768 seconds]
©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site