apport information ** Tags added: apport-collected trusty uec-images
** Description changed: #!/bin/bash # --------------------------------------------------------------------- # This script exhibits a bug in overlayfs in kernel 4.4. # The bug is not present in kernel 4.2. # The bug can be reproduced in an x86_64 virtual-machine; # 32-bit has not been tested. # # With kernel 4.2, the script output ends with: # "script completed without encountering a kernel bug" # # With kernel 4.4, the script output ends with: # "rm: cannot remove ‘mnt_ovl/sub/sub.txt’: # Value too large for defined data type" # # The script depends upon lxc-usernsexec (part of the lxc1 package) to # create a user-namespace. # # The script should be run as a normal user (not root), in a directory where # the user has write-permission: # ./script # -------------------------------------------------------------------- cleanup() { [[ -d "$storedir" ]] || exit 1 cd "$storedir" || exit 1 [[ -d "$tmpdir" ]] || exit 1 lxc-usernsexec -m b:0:1000:1 -m b:100000:100000:1 -- rm -rf "$tmpdir" } trap cleanup EXIT set -e storedir="$(pwd)" # create tmpdir tmpdir="$(mktemp -d --tmpdir=.)" cd "$tmpdir" # create lowerdir for overlay mkdir -p lower/sub touch lower/lower.txt lower/sub/sub.txt cd .. chmod -R a+rwX "$tmpdir" # run a script in a user namepace lxc-usernsexec -m b:0:100000:65534 -- bash << EOF set -e cd "$tmpdir" # create tmpfs mkdir mnt_tmpfs mount -t tmpfs tmpfs mnt_tmpfs # create upperdir and workdir for overlay mkdir mnt_tmpfs/{upper,work} # mount overlay mkdir mnt_ovl mount -t overlay \ -o lowerdir=lower,upperdir=mnt_tmpfs/upper,workdir=mnt_tmpfs/work \ overlay mnt_ovl echo 'overlay directory listing' ls -RF mnt_ovl echo '' set -x rm mnt_ovl/lower.txt # always succeeds rm mnt_ovl/sub/sub.txt # fails with kernel 4.4+ set +x echo 'script completed without encountering a kernel bug' EOF + --- + AlsaDevices: + total 0 + crw-rw---- 1 root audio 116, 1 Aug 26 15:09 seq + crw-rw---- 1 root audio 116, 33 Aug 26 15:09 timer + AplayDevices: Error: [Errno 2] No such file or directory + ApportVersion: 2.14.1-0ubuntu3.21 + Architecture: amd64 + ArecordDevices: Error: [Errno 2] No such file or directory + AudioDevicesInUse: Error: command ['fuser', '-v', '/dev/snd/seq', '/dev/snd/timer'] failed with exit code 1: + CRDA: Error: [Errno 2] No such file or directory + DistroRelease: Ubuntu 14.04 + IwConfig: Error: [Errno 2] No such file or directory + Lsusb: Error: command ['lsusb'] failed with exit code 1: unable to initialize libusb: -99 + MachineType: QEMU Standard PC (i440FX + PIIX, 1996) + Package: linux (not installed) + PciMultimedia: + + ProcEnviron: + TERM=vt102 + PATH=(custom, no user) + XDG_RUNTIME_DIR=<set> + LANG=en_US.UTF-8 + SHELL=/bin/bash + ProcFB: + + ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-4.4.0-34-generic root=UUID=78cee363-0cf0-46ce-bd06-d5601344c627 ro console=tty1 console=ttyS0 + ProcVersionSignature: User Name 4.4.0-34.53~14.04.1-generic 4.4.15 + RelatedPackageVersions: + linux-restricted-modules-4.4.0-34-generic N/A + linux-backports-modules-4.4.0-34-generic N/A + linux-firmware N/A + RfKill: Error: [Errno 2] No such file or directory + Tags: trusty uec-images + Uname: Linux 4.4.0-34-generic x86_64 + UpgradeStatus: No upgrade log present (probably fresh install) + UserGroups: adm audio cdrom dialout dip floppy netdev plugdev sudo video + _MarkForUpload: True + dmi.bios.date: 01/01/2011 + dmi.bios.vendor: Bochs + dmi.bios.version: Bochs + dmi.chassis.type: 1 + dmi.chassis.vendor: Bochs + dmi.modalias: dmi:bvnBochs:bvrBochs:bd01/01/2011:svnQEMU:pnStandardPC(i440FX+PIIX,1996):pvrpc-i440fx-trusty:cvnBochs:ct1:cvr: + dmi.product.name: Standard PC (i440FX + PIIX, 1996) + dmi.product.version: pc-i440fx-trusty + dmi.sys.vendor: QEMU ** Attachment added: "BootDmesg.txt" https://bugs.launchpad.net/bugs/1617388/+attachment/4728459/+files/BootDmesg.txt -- 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/1617388 Title: When using overlayfs with kernel 4.4, some files cannot be deleted. Status in linux package in Ubuntu: Confirmed Bug description: #!/bin/bash # --------------------------------------------------------------------- # This script exhibits a bug in overlayfs in kernel 4.4. # The bug is not present in kernel 4.2. # The bug can be reproduced in an x86_64 virtual-machine; # 32-bit has not been tested. # # With kernel 4.2, the script output ends with: # "script completed without encountering a kernel bug" # # With kernel 4.4, the script output ends with: # "rm: cannot remove ‘mnt_ovl/sub/sub.txt’: # Value too large for defined data type" # # The script depends upon lxc-usernsexec (part of the lxc1 package) to # create a user-namespace. # # The script should be run as a normal user (not root), in a directory where # the user has write-permission: # ./script # -------------------------------------------------------------------- cleanup() { [[ -d "$storedir" ]] || exit 1 cd "$storedir" || exit 1 [[ -d "$tmpdir" ]] || exit 1 lxc-usernsexec -m b:0:1000:1 -m b:100000:100000:1 -- rm -rf "$tmpdir" } trap cleanup EXIT set -e storedir="$(pwd)" # create tmpdir tmpdir="$(mktemp -d --tmpdir=.)" cd "$tmpdir" # create lowerdir for overlay mkdir -p lower/sub touch lower/lower.txt lower/sub/sub.txt cd .. chmod -R a+rwX "$tmpdir" # run a script in a user namepace lxc-usernsexec -m b:0:100000:65534 -- bash << EOF set -e cd "$tmpdir" # create tmpfs mkdir mnt_tmpfs mount -t tmpfs tmpfs mnt_tmpfs # create upperdir and workdir for overlay mkdir mnt_tmpfs/{upper,work} # mount overlay mkdir mnt_ovl mount -t overlay \ -o lowerdir=lower,upperdir=mnt_tmpfs/upper,workdir=mnt_tmpfs/work \ overlay mnt_ovl echo 'overlay directory listing' ls -RF mnt_ovl echo '' set -x rm mnt_ovl/lower.txt # always succeeds rm mnt_ovl/sub/sub.txt # fails with kernel 4.4+ set +x echo 'script completed without encountering a kernel bug' EOF To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1617388/+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