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-- 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: Triaged Status in tar package in Ubuntu: New Status in linux source package in Artful: Triaged Status in tar source package in Artful: New Bug description: root@ubuntu:~# lsb_release -rd Description: Ubuntu 17.10 Release: 17.10 root@ubuntu:~# apt-cache policy linux-image-virtual linux-image-virtual: Installed: 4.13.0.37.40 Candidate: 4.13.0.37.40 Version table: *** 4.13.0.37.40 500 500 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 4.13.0.16.17 500 500 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 4.13.0.37.40 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 : kernel-packages@lists.launchpad.net Unsubscribe : https://launchpad.net/~kernel-packages More help : https://help.launchpad.net/ListHelp
