From: Manfred Spraul <manfred@colorfullife.com>
To: John Mock <kd6pag@qsl.net>
Cc: linux-kernel@vger.kernel.org,
Benjamin Herrenschmidt <benh@kernel.crashing.org>
Subject: Re: PPC: slab error in cache_free_debugcheck() from sd_revalidate_disk
Date: Sat, 18 Oct 2003 21:41:23 +0200 [thread overview]
Message-ID: <3F919763.1000901@colorfullife.com> (raw)
John wrote:
>Hardware: PowerMac 8500 (see attached 'lspci' and 'dmesg' for details),
> ADB keyboard/mouse, USB mouse, Sony 100ES monitor
>Software: Debian 'Testing' branch
>
>Sorry, this may not be a very helpful bug report. Let me know what additional
>information might be helpful and perhaps i can rig up a serial console for
>this beast.
>
>
[snip]
>Oct 14 15:47:34 penngrove kernel: cddeec88: redzone 1: 0x0, redzone 2: 0x170fc2a5.
>O
>
That looks like a bug Ben reported some time ago: The dma controller
trashes the whole cacheline when it transfers data from disk to memory.
I think the only solution is to disable redzoning for the kmalloc
caches, or to use get_free_pages instead of kmalloc for the disk buffers,.
--
Manfred
next reply other threads:[~2003-10-18 19:42 UTC|newest]
Thread overview: 3+ messages / expand[flat|nested] mbox.gz Atom feed top
2003-10-18 19:41 Manfred Spraul [this message]
2003-10-18 21:12 ` PPC: slab error in cache_free_debugcheck() from sd_revalidate_disk Benjamin Herrenschmidt
-- strict thread matches above, loose matches on Subject: below --
2003-10-18 17:18 John Mock
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