This bug is missing log files that will aid in diagnosing the problem. While running an Ubuntu kernel (not a mainline or third-party kernel) please enter the following command in a terminal window:
apport-collect 1772575 and then change the status of the bug to 'Confirmed'. If, due to the nature of the issue you have encountered, you are unable to run this command, please add a comment stating that fact and change the bug status to 'Confirmed'. This change has been made by an automated script, maintained by the Ubuntu Kernel Team. ** Changed in: linux (Ubuntu) Status: New => Incomplete -- 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/1772575 Title: Kernel 4.4 NBD size overflow with image size exceeding 1TB Status in linux package in Ubuntu: Incomplete Bug description: Release 16.04, kernel 4.4.0-124-generic There's an issue in kernel's NBD module which prevents some larger images to be correctly "connected" , largely described here: https://github.com/NetworkBlockDevice/nbd/issues/44 There is a small patch here that was accepted into mainline 4.10: https://www.spinics.net/lists/linux-block/msg07060.html This is a regression from the previous LTS 3.13 kernel. ---- Here is a small example of the faulty behaviour: # qemu-img create -f qcow2 test.img 1100G Formatting 'test.img', fmt=qcow2 size=1181116006400 cluster_size=65536 lazy_refcounts=off refcount_bits=16 # qemu-nbd -c /dev/nbd0 test.img # blockdev --getsize64 /dev/nbd0 18446743055802302464 The correct response would be 1181116006400; this breaks most tools and makes the image unusable, e.g. # fdisk -l /dev/nbd0 fdisk: cannot open /dev/nbd0: Invalid argument To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1772575/+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