I observe a repeatable crash on Wily; when the system is rebooted, the
callstack in the crash report is similar to the one in comment #13
("BUG: unable to handle kernel NULL pointer dereference", dput -
ovl_rename2 - vfs_rename - ...).
The crash is triggered by the usage of an unprivileged LXC container
with overlayfs storage.
It rarely happens on kernel 4.2.0-22, much more frequently with kernel
4.2.0-23, very reliably with 4.2.0-25. Also it seems that replacing
system RAM with a faster one increased the incidence of the crash.
Unlike Thomas's case in #15, my system locks up completely (only Ctrl-
Alt-Shift-SysRq-B works).
I hope I'm not off topic here; my kernel is different from the one in
the original report but the stack trace is similar so I think it might
be the same root cause. I'll be glad to provide any additional info or
perform experiments.
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https://bugs.launchpad.net/bugs/1490267
Title:
Regression in overlayfs
Status in linux package in Ubuntu:
Confirmed
Bug description:
When installing the linux-lts-vivid kernel in Ubuntu 14.04, there is a
regression with overlayfs and unprivileged containers: 'failed to
whiteout'
Below the system information:
- Kernel error: http://pastebin.com/iajXHbHZ
- Kernel version: 3.19.0-25-generic #26~14.04.1-Ubuntu SMP Fri Jul 24
21:16:20 UTC 2015 x86_64 x86_64 x86_64 GNU/Linux
- Executed LXC command: lxc-clone -s -B overlayfs orig test (both
unprivileged containers)
- LXC version: 1.0.7
We discussed this on the LXC user mailing list, and this is likely a bug in
one of the patches that add support for unprivileged use of overlayfs.
---
AlsaDevices:
total 0
crw-rw 1 root audio 116, 1 Aug 30 13:56 seq
crw-rw 1 root audio 116, 33 Aug 30 13:56 timer
AplayDevices: Error: [Errno 2] No such file or directory
ApportVersion: 2.14.1-0ubuntu3.12
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:
DistroRelease: Ubuntu 14.04
Ec2AMI: ami-fceee9e1
Ec2AMIManifest: (unknown)
Ec2AvailabilityZone: eu-central-1b
Ec2InstanceType: t2.micro
Ec2Kernel: unavailable
Ec2Ramdisk: unavailable
IwConfig: Error: [Errno 2] No such file or directory
Lsusb: Error: command ['lsusb'] failed with exit code 1: unable to initialize
libusb: -99
MachineType: Xen HVM domU
Package: linux (not installed)
PciMultimedia:
ProcEnviron:
TERM=xterm-256color
PATH=(custom, no user)
LANG=en_US.UTF-8
SHELL=/bin/bash
ProcFB:
0 cirrusdrmfb
1 xen
ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-3.19.0-26-generic
root=UUID=dde0e30e-be54-43dc-9a44-5769353c2e27 ro console=tty1 console=ttyS0
ProcVersionSignature: Ubuntu 3.19.0-26.28~14.04.1-generic 3.19.8-ckt4
RelatedPackageVersions:
linux-restricted-modules-3.19.0-26-generic N/A
linux-backports-modules-3.19.0-26-generic N/A
linux-firmware 1.127.15
RfKill: Error: [Errno 2] No such file or directory
StagingDrivers: visorutil
Tags: trusty ec2-images staging
Uname: Linux 3.19.0-26-generic x86_64
UpgradeStatus: No upgrade log present (probably fresh install)
UserGroups:
_MarkForUpload: True
dmi.bios.date: 05/06/2015
dmi.bios.vendor: Xen
dmi.bios.version: 4.2.amazon
dmi.chassis.type: 1
dmi.chassis.vendor: Xen
dmi.modalias:
dmi:bvnXen:bvr4.2.amazon:bd05/06/2015:svnXen:pnHVMdomU:pvr4.2.amazon:cvnXen:ct1:cvr:
dmi.product.name: HVM domU
dmi.product.version: 4.2.amazon
dmi.sys.vendor: Xen
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