From: Qian Cai <cai@lca.pw>
To: akpm@linux-foundation.org
Cc: heiko.carstens@de.ibm.com, gor@linux.ibm.com,
borntraeger@de.ibm.com, linux-s390@vger.kernel.org,
linux-mm@kvack.org, linux-kernel@vger.kernel.org,
Qian Cai <cai@lca.pw>
Subject: [PATCH] mm/page_alloc: fix a crash in free_pages_prepare()
Date: Fri, 27 Sep 2019 15:47:03 -0400 [thread overview]
Message-ID: <1569613623-16820-1-git-send-email-cai@lca.pw> (raw)
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
Signed-off-by: Qian Cai <cai@lca.pw>
---
mm/page_alloc.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/mm/page_alloc.c b/mm/page_alloc.c
index 3334a769eb91..a54ff6a60649 100644
--- a/mm/page_alloc.c
+++ b/mm/page_alloc.c
@@ -1175,11 +1175,11 @@ static __always_inline bool free_pages_prepare(struct page *page,
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);
--
1.8.3.1
next reply other threads:[~2019-09-27 19:47 UTC|newest]
Thread overview: 14+ messages / expand[flat|nested] mbox.gz Atom feed top
2019-09-27 19:47 Qian Cai [this message]
2019-09-27 20:48 ` [PATCH] mm/page_alloc: fix a crash in free_pages_prepare() Andrew Morton
2019-09-27 21:15 ` Qian Cai
2019-09-30 7:44 ` Heiko Carstens
2019-09-27 21:02 ` Andrew Morton
2019-09-27 21:28 ` Qian Cai
2019-09-27 21:59 ` Andrew Morton
2019-09-27 22:17 ` Alexander Duyck
2019-09-28 9:06 ` David Hildenbrand
2019-09-30 6:27 ` Christian Borntraeger
2019-09-30 6:30 ` Christian Borntraeger
2019-09-30 11:00 ` Michal Hocko
2019-09-30 11:04 ` Kirill A. Shutemov
2019-09-30 11:22 ` Qian Cai
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