Red Hat Bugzilla – Bug 33409
smb_d_validate: unaligned address errors
Last modified: 2007-04-18 12:32:24 EDT
Running Florence qa0322, with both kernel-smp-2.4.2-0.1.32.i686 and -
0.1.36, same behavior.
I have smbmounted an NT4 server which contains a mirror of the Red Hat
rawhide tree. smbmount with:
smbmount //sd.us.dell.com/d\$ /mnt/sd -o
The smbmount worked just fine, and I could use ls and cd to navigate
through /mnt/sd as expected. However, when doing an ls (or a tab
expansion) in the rawhide/i386/RedHat/RPMS directory, I got the following
message spewed on the console repeatedly several hundred times:
smb_d_validate: unaligned address f69824a4
smb_d_validate: unaligned address f6982428
The address changes each time.
This message comes from linux/fs/smbfs/cache.c, smb_d_validate():
smb_d_validate(struct dentry *dentry)
unsigned long dent_addr = (unsigned long) dentry;
unsigned long align_mask = 0x0F;
if ((dent_addr & ~align_mask) != dent_addr)
which returns 0.
Clearly, it's expecting dentry to be paragraph (16-byte) aligned, but it's
smb_d_validate() is called from cache.c:smb_dget_fpos().
When it returns 0, then smb_d_getfpos() does additional work.
/* If a pointer is invalid, we search the dentry. */
So, it would appear that the alignment test isn't strictly required, and
thus shouldn't spew error messages.
Functionally, I could still read files in this directory, and other
directories exhibited the same problem when running ls. The number of
files in the directory may matter, as I get fewer errors if there are few
This is better addressed by Al or Stephen since they know the dentry stuff and I
don't. Cc:ing them so that they can take a look at this.
It's an interaction between some kernel debugging we recently enabled and an
internal debugging check in smbfs. I'll disable the smbfs check in our
debugging builds to fix this. The problem is not present in non-debugging
Fixed in CVS.