Re: [PATCH 2/2] sysfs: fix race condition around sd->s_dentry, take#2

[Eric Sandeen <sandeen@redhat.com>]

Maneesh Soni wrote:

> Looks ok to me.. I have tested it it but unfortunately I couldn't
> recreate the race without the patch also. It would be helpful if
> people actually seeing the race, provide the test results.
> 
> Greg, please merge this one once we have some test results.

I merged this back to RHEL4-era (2.6.9) kernels due to a report of this
problem on RHEL4.  The tester could hit the sysfs_d_iput bug fairly
easily before, and has not seen it with this patch in place.

The other bug they were seeing even more often was the sysfs_readdir()
oops as we try to extract the inode number for regular sysfs files,
again due to transient vnodes.  Is any fix for that problem being
considered for -stable?  I had backported a simpler version of Tejun's
s_ino fix for the problem, without the ida complexity - and brought a
couple other small upstream fixes back to support that.  If nothing has
yet been proposed for -stable, I can post that here.

Thanks,

-Eric