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
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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/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
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