Ok on investigation it seems git am is broken in the sense it is quite happy to apply a fix backwards without any warning:
$ git checkout -b TEST Ubuntu-3.13.0-45.74 $ git format-patch -1 f34c7de1e2df67ae3e370da8f6fa37e6e3219e7b 0001-ipv6-fix-swapped-ipv4-ipv6-mtu_reduced-callbacks.patch $ git am 0001-ipv6-fix-swapped-ipv4-ipv6-mtu_reduced-callbacks.patch Applying: ipv6: fix swapped ipv4/ipv6 mtu_reduced callbacks $ Wrong, wrong, wrong, wrong wrong. -- 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/1426618 Title: Latest 3.13 kernel update (3.13.0-46) is causing kernel panics related to IPv6 Status in linux package in Ubuntu: Triaged Status in linux source package in Trusty: Triaged Bug description: Hello, Pretty similar to what happened with https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1404558 but this time with the latest 3.13.0-46. I've been getting about daily kernel panics (three times so far). Screenshot attached. Another user also commented in bug 1404558 about the bug being back, though I'm assuming it's a different albeit very similar one. To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1426618/+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