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
Status in The Ubuntu-power-systems project:
** 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
** 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
Status in
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*
** Tags removed: targetmilestone-inin---
** Tags added: targetmilestone-inin16044
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Title:
kernel 4.10.0-40 is hanging with a CPU
** 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
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
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
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
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]
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
** 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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