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| author |   yalin wang <yalin.wang2010@gmail.com> | 2016-01-21 16:40:30 -0800 |
|---|---|---|
| committer |   Linus Torvalds <torvalds@linux-foundation.org> | 2016-01-21 17:20:51 -0800 |
| commit | 16fd0fe4aa92d0d621ecfe21de86f7fdcfa41947 (patch) | |
| tree | d94d862bb32b160dcacb5467c099f52748f5f1dd /mm | |
| parent | mm: fix mlock accouting (diff) | |
| download | linux-dev-16fd0fe4aa92d0d621ecfe21de86f7fdcfa41947.tar.xz linux-dev-16fd0fe4aa92d0d621ecfe21de86f7fdcfa41947.zip | |
mm: fix kernel crash in khugepaged thread
This crash is caused by NULL pointer deference, in page_to_pfn() marco,
when page == NULL :
Unable to handle kernel NULL pointer dereference at virtual address 00000000
Internal error: Oops: 94000006 [#1] SMP
Modules linked in:
CPU: 1 PID: 26 Comm: khugepaged Tainted: G W 4.3.0-rc6-next-20151022ajb-00001-g32f3386-dirty #3
PC is at khugepaged+0x378/0x1af8
LR is at khugepaged+0x418/0x1af8
Process khugepaged (pid: 26, stack limit = 0xffffffc079638020)
Call trace:
khugepaged+0x378/0x1af8
kthread+0xdc/0xf4
ret_from_fork+0xc/0x40
Code: 35001700 f0002c60 aa0703e3 f9009fa0 (f94000e0)
---[ end trace 637503d8e28ae69e ]---
Kernel panic - not syncing: Fatal exception
CPU2: stopping
CPU: 2 PID: 0 Comm: swapper/2 Tainted: G D W 4.3.0-rc6-next-20151022ajb-00001-g32f3386-dirty #3
Hardware name: linux,dummy-virt (DT)
[akpm@linux-foundation.org: fix fat-fingered merge resolution]
Signed-off-by: yalin wang <yalin.wang2010@gmail.com>
Acked-by: Vlastimil Babka <vbabka@suse.cz>
Acked-by: Kirill A. Shutemov <kirill.shutemov@linux.intel.com>
Acked-by: David Rientjes <rientjes@google.com>
Cc: Cyrill Gorcunov <gorcunov@gmail.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'mm')
| -rw-r--r-- | mm/huge_memory.c | 6 |
1 files changed, 3 insertions, 3 deletions
diff --git a/mm/huge_memory.c b/mm/huge_memory.c index 2d1ffe9d0e26..fd3a07b3e6f4 100644 --- a/mm/huge_memory.c +++ b/mm/huge_memory.c @@ -2072,7 +2072,7 @@ static int __collapse_huge_page_isolate(struct vm_area_struct *vma, if (likely(writable)) { if (likely(referenced)) { result = SCAN_SUCCEED; - trace_mm_collapse_huge_page_isolate(page_to_pfn(page), none_or_zero, + trace_mm_collapse_huge_page_isolate(page, none_or_zero, referenced, writable, result); return 1; } @@ -2082,7 +2082,7 @@ static int __collapse_huge_page_isolate(struct vm_area_struct *vma, out: release_pte_pages(pte, _pte); - trace_mm_collapse_huge_page_isolate(page_to_pfn(page), none_or_zero, + trace_mm_collapse_huge_page_isolate(page, none_or_zero, referenced, writable, result); return 0; } @@ -2580,7 +2580,7 @@ out_unmap: collapse_huge_page(mm, address, hpage, vma, node); } out: - trace_mm_khugepaged_scan_pmd(mm, page_to_pfn(page), writable, referenced, + trace_mm_khugepaged_scan_pmd(mm, page, writable, referenced, none_or_zero, result); return ret; } |