ZFS NULL pointer dereference

[Robert C Jennings]

I am using a file-backed ZFS pool for LXD containers. I have a few running and I got a few ZFS null pointer dereferences that make the system unusable.

ProblemType: Bug
DistroRelease: Ubuntu 17.04
Package: linux-image-4.10.0-33-generic 4.10.0-33.37
ProcVersionSignature: Ubuntu 4.10.0-33.37-generic 4.10.17
Uname: Linux 4.10.0-33-generic x86_64
NonfreeKernelModules: zfs zunicode zavl zcommon znvpair
ApportVersion: 2.20.4-0ubuntu4.5
Architecture: amd64
Date: Wed Aug 30 13:00:37 2017
InstallationDate: Installed on 2017-04-21 (130 days ago)
InstallationMedia: Ubuntu 17.04 "Zesty Zapus" - Beta amd64 (20170404)
MachineType: Micro-Star International Co., Ltd MS-7A34
ProcEnviron:
 TERM=xterm-256color
 PATH=(custom, no user)
 LANG=en_US.UTF-8
 SHELL=/bin/bash
ProcFB: 0 amdgpudrmfb
ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-4.10.0-33-generic.efi.signed root=UUID=1bf886cb-50ea-4487-a660-07d91bbb51fc ro quiet splash vt.handoff=7
PulseList:
 Error: command ['pacmd', 'list'] failed with exit code 1: Home directory not accessible: Permission denied
 No PulseAudio daemon running, or not running as session daemon.
RelatedPackageVersions:
 linux-restricted-modules-4.10.0-33-generic N/A
 linux-backports-modules-4.10.0-33-generic N/A
 linux-firmware 1.164.1
RfKill:

SourcePackage: linux
UpgradeStatus: No upgrade log present (probably fresh install)
dmi.bios.date: 06/22/2017
dmi.bios.vendor: American Megatrends Inc.
dmi.bios.version: 1.60
dmi.board.asset.tag: To be filled by O.E.M.
dmi.board.name: B350 TOMAHAWK (MS-7A34)
dmi.board.vendor: Micro-Star International Co., Ltd
dmi.board.version: 1.0
dmi.chassis.asset.tag: To be filled by O.E.M.
dmi.chassis.type: 3
dmi.chassis.vendor: Micro-Star International Co., Ltd
dmi.chassis.version: 1.0
dmi.modalias: dmi:bvnAmericanMegatrendsInc.:bvr1.60:bd06/22/2017:svnMicro-StarInternationalCo.,Ltd:pnMS-7A34:pvr1.0:rvnMicro-StarInternationalCo.,Ltd:rnB350TOMAHAWK(MS-7A34):rvr1.0:cvnMicro-StarInternationalCo.,Ltd:ct3:cvr1.0:
dmi.product.name: MS-7A34
dmi.product.version: 1.0
dmi.sys.vendor: Micro-Star International Co., Ltd

[Robert C Jennings (rcj)]

Kernel log attached. There are a few ZFS kernel BUG traces included NPE on dbuf_destroy() and zfs_acl_release_nodes().

[Ubuntu Kernel Bot (ubuntu-kernel-bot)]

This change was made by a bot.

[Joseph Salisbury (jsalisbury)]

Would it be possible for you to test the latest upstream kernel? Refer to https://wiki.ubuntu.com/KernelMainlineBuilds . Please test the latest v4.13 kernel[0].

If this bug is fixed in the mainline kernel, please add the following tag 'kernel-fixed-upstream'.

If the mainline kernel does not fix this bug, please add the tag: 'kernel-bug-exists-upstream'.

Once testing of the upstream kernel is complete, please mark this bug as "Confirmed".

Thanks in advance.

[0] http://kernel.ubuntu.com/~kernel-ppa/mainline/v4.13-rc7

[Robert C Jennings (rcj)]

I haven't seen this recreate with 4.10.0-35.39. This can be closed.

On Fri, Sep 1, 2017 at 9:32 AM, Joseph Salisbury <
<email address hidden>> wrote:

> Would it be possible for you to test the latest upstream kernel? Refer
> to https://wiki.ubuntu.com/KernelMainlineBuilds . Please test the latest
> v4.13 kernel[0].
>
> If this bug is fixed in the mainline kernel, please add the following
> tag 'kernel-fixed-upstream'.
>
> If the mainline kernel does not fix this bug, please add the tag:
> 'kernel-bug-exists-upstream'.
>
> Once testing of the upstream kernel is complete, please mark this bug as
> "Confirmed".
>
>
> Thanks in advance.
>
> [0] http://kernel.ubuntu.com/~kernel-ppa/mainline/v4.13-rc7
>
> ** Tags added: kernel-da-key
>
> ** Changed in: linux (Ubuntu)
> Importance: Undecided => High
>
> ** Also affects: linux (Ubuntu Zesty)
> Importance: Undecided
> Status: New
>
> ** Changed in: linux (Ubuntu Zesty)
> Status: New => Confirmed
>
> ** Changed in: linux (Ubuntu Zesty)
> Importance: Undecided => High
>
> --
> You received this bug notification because you are subscribed to the bug
> report.
> https://bugs.launchpad.net/bugs/1714065
>
> Title:
> ZFS NULL pointer dereference
>
> Status in linux package in Ubuntu:
> Confirmed
> Status in linux source package in Zesty:
> Confirmed
>
> Bug description:
> I am using a file-backed ZFS pool for LXD containers. I have a few
> running and I got a few ZFS null pointer dereferences that make the
> system unusable.
>
> ProblemType: Bug
> DistroRelease: Ubuntu 17.04
> Package: linux-image-4.10.0-33-generic 4.10.0-33.37
> ProcVersionSignature: Ubuntu 4.10.0-33.37-generic 4.10.17
> Uname: Linux 4.10.0-33-generic x86_64
> NonfreeKernelModules: zfs zunicode zavl zcommon znvpair
> ApportVersion: 2.20.4-0ubuntu4.5
> Architecture: amd64
> Date: Wed Aug 30 13:00:37 2017
> InstallationDate: Installed on 2017-04-21 (130 days ago)
> InstallationMedia: Ubuntu 17.04 "Zesty Zapus" - Beta amd64 (20170404)
> MachineType: Micro-Star International Co., Ltd MS-7A34
> ProcEnviron:
> TERM=xterm-256color
> PATH=(custom, no user)
> LANG=en_US.UTF-8
> SHELL=/bin/bash
> ProcFB: 0 amdgpudrmfb
> ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-4.10.0-33-generic.efi.signed
> root=UUID=1bf886cb-50ea-4487-a660-07d91bbb51fc ro quiet splash
> vt.handoff=7
> PulseList:
> Error: command ['pacmd', 'list'] failed with exit code 1: Home
> directory not accessible: Permission denied
> No PulseAudio daemon running, or not running as session daemon.
> RelatedPackageVersions:
> linux-restricted-modules-4.10.0-33-generic N/A
> linux-backports-modules-4.10.0-33-generic N/A
> linux-firmware 1.164.1
> RfKill:
>
> SourcePackage: linux
> UpgradeStatus: No upgrade log present (probably fresh install)
> dmi.bios.date: 06/22/2017
> dmi.bios.vendor: American Megatrends Inc.
> dmi.bios.version: 1.60
> dmi.board.asset.tag: To be filled by O.E.M.
> dmi.board.name: B350 TOMAHAWK (MS-7A34)
> dmi.board.vendor: Micro-Star International Co., Ltd
> dmi.board.version: 1.0
> dmi.chassis.asset.tag: To be fille...