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Message-ID: <20070703153747.GA28808@Krystal>
Date: Tue, 3 Jul 2007 11:37:47 -0400
From: Mathieu Desnoyers <compudj@...stal.dyndns.org>
To: Alan Cox <alan@...rguk.ukuu.org.uk>
Cc: akpm@...l.org, linux-kernel@...r.kernel.org
Subject: Re: 2.6.22-rc6-mm1 bad_page events.
Hi Alan,
I already sent a fix to Andrew and Andi for this (hrm, forget to CC
lkml on the original message):
x86_64 mm cpa cache flush fix
X86_64 and i386 cpa cache flush fix:
list_del the deferred list entries to poison their pointers.
clear the flag for every page put in the list.
Signed-off-by: Mathieu Desnoyers <mathieu.desnoyers@...ymtl.ca>
CC: Andi Kleen <ak@...e.de>
---
arch/i386/mm/pageattr.c | 3 ++-
arch/x86_64/mm/pageattr.c | 3 ++-
2 files changed, 4 insertions(+), 2 deletions(-)
Index: linux-2.6-lttng/arch/i386/mm/pageattr.c
===================================================================
--- linux-2.6-lttng.orig/arch/i386/mm/pageattr.c 2007-06-29 12:33:47.000000000 -0400
+++ linux-2.6-lttng/arch/i386/mm/pageattr.c 2007-06-29 12:35:45.000000000 -0400
@@ -245,10 +245,11 @@
spin_unlock_irq(&cpa_lock);
flush_map(&l);
list_for_each_entry_safe(pg, next, &l, lru) {
+ clear_bit(PG_arch_1, &pg->flags);
+ list_del(&pg->lru);
if (page_private(pg) != 0)
continue;
ClearPagePrivate(pg);
- clear_bit(PG_arch_1, &pg->flags);
__free_page(pg);
}
}
Index: linux-2.6-lttng/arch/x86_64/mm/pageattr.c
===================================================================
--- linux-2.6-lttng.orig/arch/x86_64/mm/pageattr.c 2007-06-29 12:33:51.000000000 -0400
+++ linux-2.6-lttng/arch/x86_64/mm/pageattr.c 2007-06-29 12:34:57.000000000 -0400
@@ -235,10 +235,11 @@
flush_map(&l);
list_for_each_entry_safe(pg, next, &l, lru) {
+ clear_bit(PG_arch_1, &pg->flags);
+ list_del(&pg->lru);
if (page_private(pg) != 0)
continue;
ClearPagePrivate(pg);
- clear_bit(PG_arch_1, &pg->flags);
__free_page(pg);
}
}
* Alan Cox (alan@...rguk.ukuu.org.uk) wrote:
> X86 32bit with lots of debug turned on I get this:
>
>
>
> Freeing unused kernel memory: 156k freed
> Write protecting the kernel text: 1668k
> Write protecting the kernel read-only data: 719k
> Bad page state in process 'swapper'
> page:c10000c0 flags:0x00000400 mapping:00000000 mapcount:0 count:0
> Trying to fix it up, but a reboot is needed
> Backtrace:
> [<c024589c>] bad_page+0x6c/0x100
> [<c024648d>] free_hot_cold_page+0x5d/0x140
> [<c02116c2>] global_flush_tlb+0x112/0x130
> [<c020102d>] init_post+0xd/0xe0
> [<c047c876>] kernel_init+0x216/0x220
> [<c0214c50>] schedule_tail+0x0/0xe0
> [<c047c660>] kernel_init+0x0/0x220
> [<c047c660>] kernel_init+0x0/0x220
> [<c0204227>] kernel_thread_helper+0x7/0x10
> =======================
> Hexdump:
> 000: 00 06 00 00 01 00 00 00 ff ff ff ff 0f 00 00 00
> 010: 00 00 00 00 00 00 00 00 78 00 00 c1 b8 00 00 c1
> 020: 00 06 00 00 01 00 00 00 ff ff ff ff a7 03 00 00
> 030: 00 00 00 00 00 00 00 00 98 00 00 c1 d8 00 00 c1
> 040: 00 04 00 00 00 00 00 00 ff ff ff ff 00 00 00 00
> 050: 00 00 00 00 00 00 00 00 b8 00 00 c1 f8 00 00 c1
> 060: 00 06 00 00 01 00 00 00 ff ff ff ff 00 04 00 00
> 070: 00 00 00 00 00 00 00 00 d8 00 00 c1 18 01 00 c1
> 080: 00 06 00 00 01 00 00 00 ff ff ff ff 9c 03 00 00
> 090: 00 00 00 00 00 00 00 00 f8 00 00 c1 38 01 00 c1
> 0a0: 00 06 00 00 01 00 00 00 ff ff ff ff 00 04 00 00
> 0b0: 00 00 00 00 00 00 00 00 18 01 00 c1 58 01 00 c1
> -
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>
--
Mathieu Desnoyers
Computer Engineering Ph.D. Student, Ecole Polytechnique de Montreal
OpenPGP key fingerprint: 8CD5 52C3 8E3C 4140 715F BA06 3F25 A8FE 3BAE 9A68
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