lists  /  announce  owl-users  owl-dev  john-users  john-dev  passwdqc-users  yescrypt  popa3d-users  /  oss-security  kernel-hardening  musl  sabotage  tlsify  passwords  /  crypt-dev  xvendor  /  Bugtraq  Full-Disclosure  linux-kernel  linux-netdev  linux-ext4  linux-hardening  PHC 
Open Source and information security mailing list archives
Hash Suite for Android: free password hash cracker in your pocket
[<prev] [next>] [day] [month] [year] [list]
Date:   Fri, 27 Apr 2018 10:52:57 -0400
From:   Pavel Tatashin <>
Subject: [PATCH v2] mm: sections are not offlined during memory hotremove

Memory hotplug, and hotremove operate with per-block granularity. If
machine has large amount of memory (more than 64G), the size of memory
block can span multiple sections. By mistake, during hotremove we set
only the first section to offline state.

The bug was discovered because kernel selftest started to fail:

After commit, "mm/memory_hotplug: optimize probe routine". But, the bug is
older than this commit. In this optimization we also added a check for
sections to be in a proper state during hotplug operation.

Fixes: 2d070eab2e82 ("mm: consider zone which is not fully populated to have holes")

Signed-off-by: Pavel Tatashin <>
Acked-by: Michal Hocko <>

 mm/sparse.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/mm/sparse.c b/mm/sparse.c
index 62eef264a7bd..73dc2fcc0eab 100644
--- a/mm/sparse.c
+++ b/mm/sparse.c
@@ -629,7 +629,7 @@ void offline_mem_sections(unsigned long start_pfn, unsigned long end_pfn)
 	unsigned long pfn;
 	for (pfn = start_pfn; pfn < end_pfn; pfn += PAGES_PER_SECTION) {
-		unsigned long section_nr = pfn_to_section_nr(start_pfn);
+		unsigned long section_nr = pfn_to_section_nr(pfn);
 		struct mem_section *ms;

Powered by blists - more mailing lists