Dear Scientific Linux team, the latest kernel 2.6.32-504 crashes if a fuse file system is accessed from within the kernel space. As discovered by Simon, this happens for instance when a fuse file system is re-exported via NFS. When it happens, the stack trace starts with BUG: unable to handle kernel NULL pointer dereference at 0000000000000030 IP: [<ffffffffa0202260>] fuse_dentry_revalidate+0xf0/0x400 [fuse] The behavior was not present with the previous kernel 2.6.32-431.29.2. Besides security patches, the latest kernel seems to also backport new fuse features which triggers the problem. As a workaround, we managed to avoid the problem with a small kernel patch [1]. Could you report the problem back to Redhat? If necessary, I can provide detailed steps how to reproduce it. Cheers, Jakob [1] https://raw.githubusercontent.com/cvmfs/aufs2-standalone/aufs2.1-32-rhel6.6/rhel6.6-fuse.patch