On 11/11/2014 07:50 AM, Jakob Blomer wrote: > 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 If we can get some more detailed replication steps it should help get the issue clearly explained to upstream. Do you have a bugzilla account? Pat -- Pat Riehecky Scientific Linux developer http://www.scientificlinux.org/