linux-kernel - Re: Slab panic on 2.6.19-rc3-git5 (-git4 was OK)

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Message-ID: <4544C709.6070305@google.com>
Date:	Sun, 29 Oct 2006 07:21:45 -0800
From:	"Martin J. Bligh" <mbligh@...gle.com>
To:	Giridhar Pemmasani <pgiri@...oo.com>
CC:	Pekka Enberg <penberg@...helsinki.fi>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	linux-mm <linux-mm@...ck.org>, Andy Whitcroft <apw@...dowen.org>,
	Linus Torvalds <torvalds@...l.org>,
	Andrew Morton <akpm@...l.org>
Subject: Re: Slab panic on 2.6.19-rc3-git5 (-git4 was OK)

>> I only skimmed through this briefly but it looks like due to
>> 52fd24ca1db3a741f144bbc229beefe044202cac __get_vm_area_node is passing
>> GFP_HIGHMEM to kmem_cache_alloc_node which is a no-no.
> 
> I haven't been able to reproduce this, although I understand why it happens:
> vmalloc allocates memory with
> 
> GFP_KERNEL | __GFP_HIGHMEM
> 
> and with git5, the same flags are passed down to cache_alloc_refill, causing
> the BUG. The following patch against 2.6.19-rc3-git5 (also attached as
> attachment, as this mailer may mess up inline copying) should fix it.

Thanks for the patch ... but more worrying is how this got broken.
Wasn't the point of having the -mm tree that patches like this went
through it for testing, and we avoid breaking mainline? especially
this late in the -rc cycle.

M.
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