The patch titled
Subject: mm/page_alloc.c: fix a crash in free_pages_prepare()
has been added to the -mm tree. Its filename is
mm-page_alloc-fix-a-crash-in-free_pages_prepare.patch
This patch should soon appear at
http://ozlabs.org/~akpm/mmots/broken-out/mm-page_alloc-fix-a-crash-in-free_pages_prepare.patch
and later at
http://ozlabs.org/~akpm/mmotm/broken-out/mm-page_alloc-fix-a-crash-in-free_pages_prepare.patch
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------------------------------------------------------
From: Qian Cai <cai@xxxxxx>
Subject: mm/page_alloc.c: fix a crash in free_pages_prepare()
On architectures like s390, arch_free_page() could mark the page unused
(set_page_unused()) and any access later would trigger a kernel panic.
Fix it by moving arch_free_page() after all possible accessing calls.
Hardware name: IBM 2964 N96 400 (z/VM 6.4.0)
Krnl PSW : 0404e00180000000 0000000026c2b96e
(__free_pages_ok+0x34e/0x5d8)
R:0 T:1 IO:0 EX:0 Key:0 M:1 W:0 P:0 AS:3 CC:2 PM:0 RI:0 EA:3
Krnl GPRS: 0000000088d43af7 0000000000484000 000000000000007c
000000000000000f
000003d080012100 000003d080013fc0 0000000000000000
0000000000100000
00000000275cca48 0000000000000100 0000000000000008
000003d080010000
00000000000001d0 000003d000000000 0000000026c2b78a
000000002717fdb0
Krnl Code: 0000000026c2b95c: ec1100b30659 risbgn %r1,%r1,0,179,6
0000000026c2b962: e32014000036 pfd 2,1024(%r1)
#0000000026c2b968: d7ff10001000 xc 0(256,%r1),0(%r1)
>0000000026c2b96e: 41101100 la %r1,256(%r1)
0000000026c2b972: a737fff8 brctg %r3,26c2b962
0000000026c2b976: d7ff10001000 xc 0(256,%r1),0(%r1)
0000000026c2b97c: e31003400004 lg %r1,832
0000000026c2b982: ebff1430016a asi 5168(%r1),-1
Call Trace:
__free_pages_ok+0x16a/0x5d8)
memblock_free_all+0x206/0x290
mem_init+0x58/0x120
start_kernel+0x2b0/0x570
startup_continue+0x6a/0xc0
INFO: lockdep is turned off.
Last Breaking-Event-Address:
__free_pages_ok+0x372/0x5d8
Kernel panic - not syncing: Fatal exception: panic_on_oops
00: HCPGIR450W CP entered; disabled wait PSW 00020001 80000000 00000000
26A2379C
Link: http://lkml.kernel.org/r/1569613623-16820-1-git-send-email-cai@xxxxxx
Signed-off-by: Qian Cai <cai@xxxxxx>
Cc: Heiko Carstens <heiko.carstens@xxxxxxxxxx>
Cc: Vasily Gorbik <gor@xxxxxxxxxxxxx>
Cc: Christian Borntraeger <borntraeger@xxxxxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
---
mm/page_alloc.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
--- a/mm/page_alloc.c~mm-page_alloc-fix-a-crash-in-free_pages_prepare
+++ a/mm/page_alloc.c
@@ -1175,11 +1175,11 @@ static __always_inline bool free_pages_p
debug_check_no_obj_freed(page_address(page),
PAGE_SIZE << order);
}
- arch_free_page(page, order);
if (want_init_on_free())
kernel_init_free_pages(page, 1 << order);
kernel_poison_pages(page, 1 << order, 0);
+ arch_free_page(page, order);
if (debug_pagealloc_enabled())
kernel_map_pages(page, 1 << order, 0);
_
Patches currently in -mm which might be from cai@xxxxxx are
mm-page_alloc-fix-a-crash-in-free_pages_prepare.patch
