linux-kernel - Re: BUG: failure at mm/nommu.c:518/add_nommu

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Date:	Tue, 05 May 2009 14:41:01 +0100
From:	David Howells <dhowells@...hat.com>
To:	Greg Ungerer <gerg@...pgear.com>
Cc:	dhowells@...hat.com, linux-kernel@...r.kernel.org
Subject: Re: BUG: failure at mm/nommu.c:518/add_nommu_region()

Greg Ungerer <gerg@...pgear.com> wrote:

> BUG: failure at mm/nommu.c:518/add_nommu_region()!

Can you find out some more information about the region in question, perhaps
with the attached patch?

Also if you can check to see whether the region is within the ROMFS image.

David
---
diff --git a/mm/nommu.c b/mm/nommu.c
index cdc6f60..ba9e230 100644
--- a/mm/nommu.c
+++ b/mm/nommu.c
@@ -515,7 +515,18 @@ static void add_nommu_region(struct vm_region *region)
 
 	validate_nommu_regions();
 
-	BUG_ON(region->vm_start & ~PAGE_MASK);
+	if (region->vm_start & ~PAGE_MASK) {
+		printk(KERN_ERR "___ REGION ERROR ___\n");
+		printk(KERN_ERR "%lx-%lx\n", region->vm_start, region->vm_end);
+		printk(KERN_ERR "fs=%s file=%s\n",
+		       region->vm_file ?
+		       region->vm_file->f_path.dentry->d_inode->i_sb->s_type->name :
+		       "*anon*",
+		       region->vm_file ?
+		       region->vm_file->f_path.dentry->d_name.name :
+		       (const unsigned char *) "*anon*");
+		BUG();
+	}
 
 	parent = NULL;
 	p = &nommu_region_tree.rb_node;
--
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