Please upgrade to linux-hwe kernel version 4.13 and re-open this bug if
you are able to reproduce this bug.
** Changed in: linux (Ubuntu)
Status: In Progress => Won't Fix
** Changed in: ubuntu-power-systems
Status: In Progress => Won't Fix
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** Tags added: kernel-da-key
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Title:
kernel 4.10.0-40 is hanging with a CPU soft lock
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** Changed in: ubuntu-power-systems
Importance: Critical => High
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Title:
kernel 4.10.0-40 is hanging with a CPU soft lock
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** Tags removed: severity-critical
** Tags added: severity-high
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Title:
kernel 4.10.0-40 is hanging with a CPU soft lock
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After experiencing the issue on the guest, I turned on SMT again and the
threads look fine:
$ sudo ppc64_cpu --smt=8
$ sudo ppc64_cpu --info
Core 0:0*1*2*3*4*5*6*7*
Core 1:8*9* 10* 11* 12* 13* 14* 15*
Core 2: 16* 17* 18* 19* 20*
** Tags removed: targetmilestone-inin---
** Tags added: targetmilestone-inin16044
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Title:
kernel 4.10.0-40 is hanging with a CPU soft lock
To ma
** Changed in: ubuntu-power-systems
Status: New => In Progress
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Title:
kernel 4.10.0-40 is hanging with a CPU soft lock
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Hi Diego,
What's the processor type of the host system?
Thanks,
Kleber
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Title:
kernel 4.10.0-40 is hanging with a CPU soft lock
To manage noti
The problem seems to be related to how qemu allocates the virtual cores
and threads to the VM.
Starting the VMs with the following command I cannot reproduce the
issue:
$ qemu-system-ppc64le -m 1024 -smp 16,threads=8 -nographic -net
nic,model=virtio -net user,hostfwd=tcp::10022-:22 -drive file
=.
I also found that if I run artful VM on the same hypervisor, I do not
see this problem on artful kernel.
So, from what I see, it seems to be a problem on kernel 4.10 that is
being exposed better on a KVM that runs on kernel 4.13.
This is better log I was able to capture:
[ 32.029274] NMI watch
I found something interesting. The original dump above was reproduced
with kernel 4.4.0-94-generic in the hypervisor. It is very hard to
reproduce this issue on the following hypervisor (I just reproduce this
once in a while).
I migrated to a machine to use kernel 4.13.0-17-generic and the problem
I can reproduce the issue even going back to Zesty kernel
4.10.0-20-generic on the guest. I will continue going back to try to
identify the first bad version.
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Looking in a email thread titled "RCU lockup issues when
CONFIG_SOFTLOCKUP_DETECTOR=n - any one else seeing this?"[1] it seems
that this problem is very similar to the one in the thread.
The final fix seems to be commit id
2fe59f507a65dbd734b990a11ebc7488f6f87a24.
[1]
http://linuxppc.10917.n7.n
I can reproduce the problem if I provide nr_cpu > 1 for -smp qemu flag.
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Title:
kernel 4.10.0-40 is hanging with a CPU soft lock
To manage notif
** Changed in: linux (Ubuntu)
Importance: Undecided => Critical
** Changed in: linux (Ubuntu)
Status: New => In Progress
** Changed in: linux (Ubuntu)
Assignee: Ubuntu on IBM Power Systems Bug Triage (ubuntu-power-triage) =>
Kleber Sacilotto de Souza (kleber-souza)
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** Also affects: ubuntu-power-systems
Importance: Undecided
Status: New
** Changed in: ubuntu-power-systems
Assignee: (unassigned) => Canonical Kernel Team (canonical-kernel-team)
** Changed in: ubuntu-power-systems
Importance: Undecided => Critical
** Tags added: triage-g
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