SRU justification: Impact: Kernel BUG in lib/radix-tree.c:372.
There is no serialisation between NFS asynchronous writebacks and truncation at the page level due to the fact that nfs_sync_inode() cannot lock the pages that it is about to write out. This means that it is possible to be flushing out data (and calling something like set_page_writeback()) while the page cache is busy evicting the page. Fix: Backport of upstream cherry pick cd52ed35535ef443f08bf5cd3331d350272885b8 Testcases: 1. Dapper Kernel always freezes when it mounts nfsv4 filesystems and 2. Virtual vmware machines are on a nfs mounted filesystem. One vmware machine goes unuseable and comsumes all the CPU time. A kill -KILL pid doesn't wipe out the vmware process. A ls -lh on the nfs mount hangs. and 3. Create file i/o's in a virtual host, for example copy folder to other and kernel BUG in lib/radix-tree.c occurs. -- Kernel race condition if nfs mounts present on real or virtual nodes [kernel BUG at lib/radix-tree.c] https://bugs.launchpad.net/bugs/58170 You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. -- ubuntu-bugs mailing list [email protected] https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
