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

On Sun, 9 Mar 2003, Patrick Mochel wrote:

>
> On Sun, 9 Mar 2003, Martin J. Bligh wrote:
>
> > Look for akpm's latest -mm tree release notes - the patch is embedded
> > in there.
>
> Actually, sysfs is officially fscked in 2.5.64. I'm looking into it, so
> more reports of it crashing are not necessary. :) I apologize for the
> inconveniences this has caused.

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.. ]

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 14:25:26 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);
===== 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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