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

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Date:	Sun, 29 Oct 2006 17:19:38 -0800 (PST)
From:	Linus Torvalds <torvalds@...l.org>
To:	"Martin J. Bligh" <mbligh@...igh.org>
cc:	Andy Whitcroft <apw@...dowen.org>, Andrew Morton <akpm@...l.org>,
	"Martin J. Bligh" <mbligh@...gle.com>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	linux-mm <linux-mm@...ck.org>
Subject: Re: Slab panic on 2.6.19-rc3-git5 (-git4 was OK)



On Sun, 29 Oct 2006, Martin J. Bligh wrote:
> 
> Seems like that doesn't fix it, I'm afraid.

Does the one in the current -git tree? It's commit 
5211e6e6c671f0d4b1e1a1023384d20227d8ee65, as below..

		Linus

---
commit 5211e6e6c671f0d4b1e1a1023384d20227d8ee65
Author: Giridhar Pemmasani <pgiri@...oo.com>
Date:   Sun Oct 29 04:46:55 2006 -0800

    [PATCH] Fix GFP_HIGHMEM slab panic
    
    As reported by Martin J. Bligh <mbligh@...gle.com>, we let through some
    non-slab bits to slab allocation through __get_vm_area_node when doing a
    vmalloc.
    
    I haven't been able to reproduce this, although I understand why it
    happens: vmalloc allocates memory with
    
    GFP_KERNEL | __GFP_HIGHMEM
    
    and commit 52fd24ca1db3a741f144bbc229beefe044202cac resulted in the same
    flags are passed down to cache_alloc_refill, causing the BUG.  The
    following patch fixes it.
    
    Note that when calling kmalloc_node, I am masking off __GFP_HIGHMEM with
    GFP_LEVEL_MASK, whereas __vmalloc_area_node does the same with
    
    ~(__GFP_HIGHMEM | __GFP_ZERO).
    
    IMHO, using GFP_LEVEL_MASK is preferable, but either should fix this
    problem.
    
    Signed-off-by: Giridhar Pemmasani (pgiri@...oo.com)
    Cc: Martin J. Bligh <mbligh@...gle.com>
    Cc: Andrew Morton <akpm@...l.org>
    Signed-off-by: Linus Torvalds <torvalds@...l.org>

diff --git a/mm/vmalloc.c b/mm/vmalloc.c
index 6d381df..46606c1 100644
--- a/mm/vmalloc.c
+++ b/mm/vmalloc.c
@@ -182,7 +182,7 @@ static struct vm_struct *__get_vm_area_n
 	addr = ALIGN(start, align);
 	size = PAGE_ALIGN(size);
 
-	area = kmalloc_node(sizeof(*area), gfp_mask, node);
+	area = kmalloc_node(sizeof(*area), gfp_mask & GFP_LEVEL_MASK, node);
 	if (unlikely(!area))
 		return NULL;
 
-
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