Public bug reported: 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 ** Affects: linux (Ubuntu) Importance: Undecided Status: New -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1772575 Title: Kernel 4.4 NBD size overflow with image size exceeding 1TB To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1772575/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
