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SubjectRe: Kernel bug in dcache.h:266; 2.5.64, EIP at sysfs_remove_dir

On 9 Mar 2003, Jeremy Fitzhardinge wrote:

> On Sun, 2003-03-09 at 12:31, Patrick Mochel wrote:
> > I was able to reproduce the Oops with a USB device on multiple insert/
> > removals. The patch below fixes the Oops for me. Could people who have
> > seen the Oops try it out and let me know if it helps them?
> >
> > [ Unfortunately, I can't test some of the exact failure scenarios, as I
> > don't use ppp, and my one system with PCMCIA has decided that it doesn't
> > want to let me (physically) insert cards anymore.. ]
>
> I'm still getting a crash with this patch+mm4. I got this on ethernet
> card removal:

Bah, we're accidentally dropping the refcount on the directory one too
many times, which is a different, though slightly related, problem to the
one the previous patch fixed.

Please try this patch (after removing the previous one). Thanks,

-pat

===== fs/sysfs/dir.c 1.4 vs edited =====
--- 1.4/fs/sysfs/dir.c Sat Mar 8 23:42:32 2003
+++ edited/fs/sysfs/dir.c Sun Mar 9 16:01:45 2003
@@ -98,7 +98,6 @@
* Unlink and unhash.
*/
spin_unlock(&dcache_lock);
- d_delete(d);
simple_unlink(dentry->d_inode,d);
dput(d);
spin_lock(&dcache_lock);
@@ -108,16 +107,11 @@
}
spin_unlock(&dcache_lock);
up(&dentry->d_inode->i_sem);
- d_invalidate(dentry);
- simple_rmdir(parent->d_inode,dentry);
d_delete(dentry);
+ simple_rmdir(parent->d_inode,dentry);

pr_debug(" o %s removing done (%d)\n",dentry->d_name.name,
atomic_read(&dentry->d_count));
- /**
- * Drop reference from initial sysfs_get_dentry().
- */
- dput(dentry);

/**
* Drop reference from dget() on entrance.
===== fs/sysfs/inode.c 1.83 vs edited =====
--- 1.83/fs/sysfs/inode.c Mon Mar 3 17:11:29 2003
+++ edited/fs/sysfs/inode.c Sun Mar 9 14:25:45 2003
@@ -93,19 +93,14 @@
/* make sure dentry is really there */
if (victim->d_inode &&
(victim->d_parent->d_inode == dir->d_inode)) {
- simple_unlink(dir->d_inode,victim);
- d_delete(victim);
-
pr_debug("sysfs: Removing %s (%d)\n", victim->d_name.name,
atomic_read(&victim->d_count));
- /*
- * Drop reference from initial sysfs_get_dentry().
- */
- dput(victim);
+
+ simple_unlink(dir->d_inode,victim);
+
}
-
- /**
- * Drop the reference acquired from sysfs_get_dentry() above.
+ /*
+ * Drop reference from sysfs_get_dentry() above.
*/
dput(victim);
}
-
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