This bug is awaiting verification that the kernel in -proposed solves the problem. Please test the kernel and update this bug with the results. If the problem is solved, change the tag 'verification-needed- artful' to 'verification-done-artful'. If the problem still exists, change the tag 'verification-needed-artful' to 'verification-failed- artful'.
If verification is not done by 5 working days from today, this fix will be dropped from the source code, and this bug will be closed. See https://wiki.ubuntu.com/Testing/EnableProposed for documentation how to enable and use -proposed. Thank you! ** Tags added: verification-needed-artful -- 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/1757565 Title: btrfs and tar sparse truncate archives Status in linux package in Ubuntu: Fix Released Status in tar package in Ubuntu: New Status in linux source package in Artful: Fix Committed Status in tar source package in Artful: New Bug description: == SRU Justification == This bug causes btrfs and tar sparse to truncate archives. This bug has been fixed in v4.15-rc3 by commit e3b8a4858566, which has a prereq commit of f48bf66b662e. These commits were cc'd to upstream stable and are already in Bionic. However, upstream 4.13 is EOL, so Artful never recieved the fixes, which is the reason for the SRU request. == Fixes == f48bf66b662e ("Btrfs: move definition of the function btrfs_find_new_delalloc_bytes") e3b8a4858566 ("Btrfs: fix reported number of inode blocks after buffered append writes") == Regression Potential == Low. This fix was also sent and accepted to stable, so it has had additional upstream review. == Test Case == A test kernel was built with these patches and tested by the original bug reporter. The bug reporter states the test kernel resolved the bug. root@ubuntu:~# lsb_release -rd Description: Ubuntu 17.10 Release: 17.10 root@ubuntu:~# apt-cache policy linux-image-virtual linux-image-virtual: Installed: 22.214.171.124.40 Candidate: 126.96.36.199.40 Version table: *** 188.8.131.52.40 500 500 http://archive.ubuntu.com/ubuntu artful-updates/main amd64 Packages 500 http://security.ubuntu.com/ubuntu artful-security/main amd64 Packages 100 /var/lib/dpkg/status 184.108.40.206.17 500 500 http://archive.ubuntu.com/ubuntu artful/main amd64 Packages 3. Taring files into an archive are not truncated 4. Files included in tar are filled with NULLs To reproduce, run an Artful system with one spare disk: - mkfs.btrfs -f /dev/sda - mount /dev/sda /mnt - grep sda /proc/mounts /dev/sda /mnt btrfs rw,relatime,space_cache,subvolid=5,subvol=/ 0 0 Then run this script which copies a 4MB binary to a btrfs filesystem, tars the directory up containing the binary; then untars to stdout and md5sum compares, showing it's different. % SPARSE="-S"; rm -rf /mnt/tmp; md5sum /usr/bin/python3.6; mkdir -p /mnt/tmp; cp -a /usr/bin/python3.6 /mnt/tmp; tar -C /mnt/tmp $SPARSE -czf /mnt/test.tgz .; tar $SPARSE -xzf /mnt/test.tgz -O | md5sum e4121d2f3126b8c364bfa1aaa82371a3 /usr/bin/python3.6 0ce8c4139740198926273853defcb12a - And now without the sparse flag: # SPARSE=""; rm -rf /mnt/tmp; md5sum /usr/bin/python3.6; mkdir -p /mnt/tmp; cp -a /usr/bin/python3.6 /mnt/tmp; tar -C /mnt/tmp $SPARSE -czf /mnt/test.tgz .; tar $SPARSE -xzf /mnt/test.tgz -O | md5sum e4121d2f3126b8c364bfa1aaa82371a3 /usr/bin/python3.6 e4121d2f3126b8c364bfa1aaa82371a3 - This has been reported to both gnu-tar and linux-btrfs; I'm not aware of an actual fix. Note that Xenial 4.4 kernels do not exhibit this behavior, and Bionic 4.15 kernel appears to be fixed as well though I'm not sure what the difference is. References: https://patchwork.kernel.org/patch/10151037/ https://www.spinics.net/lists/linux-btrfs/msg56768.html https://www.spinics.net/lists/linux-btrfs/msg57111.html ProblemType: Bug DistroRelease: Ubuntu 17.10 Package: linux-image-virtual 220.127.116.11.40 ProcVersionSignature: Ubuntu 4.13.0-37.42-generic 4.13.13 Uname: Linux 4.13.0-37-generic x86_64 AlsaDevices: total 0 crw-rw---- 1 root audio 116, 1 Mar 21 22:55 seq crw-rw---- 1 root audio 116, 33 Mar 21 22:55 timer AplayDevices: Error: [Errno 2] No such file or directory: 'aplay': 'aplay' ApportVersion: 2.20.7-0ubuntu3.7 Architecture: amd64 ArecordDevices: Error: [Errno 2] No such file or directory: 'arecord': 'arecord' AudioDevicesInUse: Error: command ['fuser', '-v', '/dev/snd/seq', '/dev/snd/timer'] failed with exit code 1: CRDA: N/A Date: Wed Mar 21 23:08:05 2018 IwConfig: Error: [Errno 2] No such file or directory: 'iwconfig': 'iwconfig' Lsusb: Error: command ['lsusb'] failed with exit code 1: MachineType: QEMU Standard PC (i440FX + PIIX, 1996) PciMultimedia: ProcEnviron: TERM=xterm-256color PATH=(custom, no user) LANG=C.UTF-8 SHELL=/bin/bash ProcFB: ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-4.13.0-37-generic root=LABEL=cloudimg-rootfs ro console=tty1 console=ttyS0 RelatedPackageVersions: linux-restricted-modules-4.13.0-37-generic N/A linux-backports-modules-4.13.0-37-generic N/A linux-firmware N/A RfKill: Error: [Errno 2] No such file or directory: 'rfkill': 'rfkill' SourcePackage: linux UpgradeStatus: No upgrade log present (probably fresh install) dmi.bios.date: 04/01/2014 dmi.bios.vendor: SeaBIOS dmi.bios.version: Ubuntu-1.8.2-1ubuntu1 dmi.chassis.type: 1 dmi.chassis.vendor: QEMU dmi.chassis.version: pc-i440fx-xenial dmi.modalias: dmi:bvnSeaBIOS:bvrUbuntu-1.8.2-1ubuntu1:bd04/01/2014:svnQEMU:pnStandardPC(i440FX+PIIX,1996):pvrpc-i440fx-xenial:cvnQEMU:ct1:cvrpc-i440fx-xenial: dmi.product.name: Standard PC (i440FX + PIIX, 1996) dmi.product.version: pc-i440fx-xenial dmi.sys.vendor: QEMU To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1757565/+subscriptions -- Mailing list: https://launchpad.net/~kernel-packages Post to : firstname.lastname@example.org Unsubscribe : https://launchpad.net/~kernel-packages More help : https://help.launchpad.net/ListHelp