Comment 32 for bug 1799497

Hi.. I had to remove zram config from my production servers long ago. ...
since then I don't have the issue. I was using LXD containers a lot on the
hosts with different kind of usage,, But I don't have any other setup at
the moment

On Fri, Jan 10, 2020 at 12:11 AM Colin Ian King <email address hidden>
wrote:

> Can reproduce this with stress-ng exercising high memory pressure scenario
> using:
> stress-ng --brk 0 -v --aiol 0
>
> --
> You received this bug notification because you are subscribed to the bug
> report.
> https://bugs.launchpad.net/bugs/1799497
>
> Title:
> 4.15 kernel hard lockup about once a week
>
> Status in linux package in Ubuntu:
> Incomplete
> Status in zram-config package in Ubuntu:
> Incomplete
> Status in linux source package in Bionic:
> Confirmed
> Status in zram-config source package in Bionic:
> Confirmed
>
> Bug description:
> My main server has been running into hard lockups about once a week
> ever since I switched to the 4.15 Ubuntu 18.04 kernel.
>
> When this happens, nothing is printed to the console, it's effectively
> stuck showing a login prompt. The system is running with panic=1 on
> the cmdline but isn't rebooting so the kernel isn't even processing
> this as a kernel panic.
>
>
> As this felt like a potential hardware issue, I had my hosting provider
> give me a completely different system, different motherboard, different
> CPU, different RAM and different storage, I installed that system on 18.04
> and moved my data over, a week later, I hit the issue again.
>
> We've since also had a LXD user reporting similar symptoms here also on
> varying hardware:
> https://github.com/lxc/lxd/issues/5197
>
>
> My system doesn't have a lot of memory pressure with about 50% of free
> memory:
>
> root@vorash:~# free -m
> total used free shared buff/cache
> available
> Mem: 31819 17574 402 513 13842
> 13292
> Swap: 15909 2687 13222
>
> I will now try to increase console logging as much as possible on the
> system in the hopes that next time it hangs we can get a better idea
> of what happened but I'm not too hopeful given the complete silence on
> the console when this occurs.
>
> System is currently on:
> Linux vorash 4.15.0-36-generic #39-Ubuntu SMP Mon Sep 24 16:19:09 UTC
> 2018 x86_64 x86_64 x86_64 GNU/Linux
>
> But I've seen this since the GA kernel on 4.15 so it's not a recent
> regression.
> ---
> ProblemType: Bug
> AlsaDevices:
> total 0
> crw-rw---- 1 root audio 116, 1 Oct 23 16:12 seq
> crw-rw---- 1 root audio 116, 33 Oct 23 16:12 timer
> AplayDevices: Error: [Errno 2] No such file or directory: 'aplay':
> 'aplay'
> ApportVersion: 2.20.9-0ubuntu7.4
> 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: Cannot stat file /proc/22822/fd/10: Permission denied
> Cannot stat file /proc/22831/fd/10: Permission denied
> DistroRelease: Ubuntu 18.04
> HibernationDevice:
> RESUME=none
> CRYPTSETUP=n
> IwConfig: Error: [Errno 2] No such file or directory: 'iwconfig':
> 'iwconfig'
> Lsusb:
> Bus 002 Device 001: ID 1d6b:0003 Linux Foundation 3.0 root hub
> Bus 001 Device 002: ID 046b:ff10 American Megatrends, Inc. Virtual
> Keyboard and Mouse
> Bus 001 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub
> MachineType: Intel Corporation S1200SP
> NonfreeKernelModules: zfs zunicode zavl icp zcommon znvpair
> Package: linux (not installed)
> PciMultimedia:
>
> ProcEnviron:
> TERM=xterm
> PATH=(custom, no user)
> XDG_RUNTIME_DIR=<set>
> LANG=en_US.UTF-8
> SHELL=/bin/bash
> ProcFB: 0 mgadrmfb
> ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-4.15.0-38-generic
> root=UUID=575c878a-0be6-4806-9c83-28f67aedea65 ro biosdevname=0
> net.ifnames=0 panic=1 verbose console=tty0 console=ttyS0,115200n8
> ProcVersionSignature: Ubuntu 4.15.0-38.41-generic 4.15.18
> RelatedPackageVersions:
> linux-restricted-modules-4.15.0-38-generic N/A
> linux-backports-modules-4.15.0-38-generic N/A
> linux-firmware 1.173.1
> RfKill: Error: [Errno 2] No such file or directory: 'rfkill': 'rfkill'
> Tags: bionic
> Uname: Linux 4.15.0-38-generic x86_64
> UnreportableReason: This report is about a package that is not installed.
> UpgradeStatus: No upgrade log present (probably fresh install)
> UserGroups:
>
> _MarkForUpload: False
> dmi.bios.date: 01/25/2018
> dmi.bios.vendor: Intel Corporation
> dmi.bios.version: S1200SP.86B.03.01.1029.012520180838
> dmi.board.asset.tag: Base Board Asset Tag
> dmi.board.name: S1200SP
> dmi.board.vendor: Intel Corporation
> dmi.board.version: H57532-271
> dmi.chassis.asset.tag: ....................
> dmi.chassis.type: 23
> dmi.chassis.vendor: ...............................
> dmi.chassis.version: ..................
> dmi.modalias:
> dmi:bvnIntelCorporation:bvrS1200SP.86B.03.01.1029.012520180838:bd01/25/2018:svnIntelCorporation:pnS1200SP:pvr....................:rvnIntelCorporation:rnS1200SP:rvrH57532-271:cvn...............................:ct23:cvr..................:
> dmi.product.family: Family
> dmi.product.name: S1200SP
> dmi.product.version: ....................
> dmi.sys.vendor: Intel Corporation
>
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