Tried 3.16.7 mainline and can no longer reproduce the issue. The commit "NFS: Fix an uninitialised pointer Oops in the writeback error path" appears to be the fix.
** Tags removed: kernel-unable-to-test-upstream ** Tags added: kernel-fixed-upstream ** Changed in: linux (Ubuntu) Status: Incomplete => Confirmed -- You received this bug notification because you are a member of Kernel Packages, which is subscribed to linux in Ubuntu. https://bugs.launchpad.net/bugs/1384659 Title: NFSv3/TCP in 14.10 major issues and kernel NULL pointer dereference Status in “linux” package in Ubuntu: Confirmed Bug description: Upgraded a NFS client to 14.10. Server is running FreeBSD 10.0, no changes on server from when client was running 14.04. Client is using NFSv3 over TCP. Client hosts virtual machines - first virtual machine starts ok, second virtual machine starts but machine needs to fsck and reports timeouts, left overnight still cannot complete fsck. A simple "ls" of the NFS share hangs. 3.16.0-22-generic kernel kern.log generates warning and the Oops with null pointer dereference (see attached). Tried mainline 3.16.6-031606-generic with same result (see attached). Same behaviour, fsck never finishes and ls hangs. Tried mainline 3.14.22-031422-generic and problem is gone, fsck finishes in several seconds, no problems with ls, machine and VMs running normally since. To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1384659/+subscriptions -- Mailing list: https://launchpad.net/~kernel-packages Post to : kernel-packages@lists.launchpad.net Unsubscribe : https://launchpad.net/~kernel-packages More help : https://help.launchpad.net/ListHelp