Re: 2.6.1-mm2: BUG in kswapd?

[Maneesh Soni <maneesh@in.ibm.com>]

On Fri, Jan 16, 2004 at 03:10:37PM +0530, Maneesh Soni wrote:
> 
[..]
> Can you elaborate on the recreation scenario a little bit more or if possible
> run this debug patch on top of -mm3. This should print some info about the 
> bad dentry.
> 


Walt,

Pleae run this debug patch instead of the previous one. Thanks to Andrew
for suggestion.


 fs/dcache.c |    6 ++++++
 1 files changed, 6 insertions(+)

diff -puN fs/dcache.c~prune_dcache-debug fs/dcache.c
--- linux-2.6.1-mm3/fs/dcache.c~prune_dcache-debug	2004-01-16 14:36:00.000000000 +0530
+++ linux-2.6.1-mm3-maneesh/fs/dcache.c	2004-01-16 15:41:26.000000000 +0530
@@ -344,6 +344,12 @@ static inline void prune_one_dentry(stru
 	struct dentry * parent;
 
 	__d_drop(dentry);
+	if (dentry->d_child.next->prev != &dentry->d_child) {
+		printk("Bad dentry for %s count %d %p %p\n", dentry->d_name.name, atomic_read(&dentry->d_count), dentry->d_child.next, dentry->d_child.prev);
+		if (dentry->d_sb)
+			printk("Super block magic %lx\n", dentry->d_sb->s_magic);
+		BUG();
+	}
 	list_del(&dentry->d_child);
 	dentry_stat.nr_dentry--;	/* For d_free, below */
 	dentry_iput(dentry);

_

-- 
Maneesh Soni
Linux Technology Center, 
IBM Software Lab, Bangalore, India
email: maneesh@in.ibm.com
Phone: 91-80-5044999 Fax: 91-80-5268553
T/L : 9243696