Bug#861746: linux-image-4.9.0-2-amd64: Infinity `soft lockup` at kernel 4.9.0-1+ on HP ProLiant DL360G5

From	Ben Hutchings <ben@decadent.org.uk>
Newsgroups	linux.debian.bugs.dist, linux.debian.kernel
Subject	Bug#861746: linux-image-4.9.0-2-amd64: Infinity `soft lockup` at kernel 4.9.0-1+ on HP ProLiant DL360G5
Date	2017-09-25 00:40 +0200
Message-ID	<utnJ8-659-9@gated-at.bofh.it> (permalink)
References	<tD2cx-5Og-1@gated-at.bofh.it> <tD2cx-5Og-1@gated-at.bofh.it>
Organization	linux.* mail to news gateway

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On Wed, 2017-05-03 at 15:55 +0300, Arano-kai wrote:
> Package: src:linux
> Version: 4.9.18-1
> Severity: critical
> Tags: upstream
> Justification: breaks the whole system
> 
> Dear Maintainer,
> after updating the kernel to `4.9.0-2-amd64` on HP DL360G5, the
> system hangs up with repeating `NMI watchdog: BUG: soft lockup -
> CPU#0 stuck for 23s! [swapper/0:1]`.
> `4.9.0-1-amd64` also affected.
> Last working kernel is `4.8.0-2-amd64`
> 
> Boot possible only if `acpi=off` provided in kernel opts.
[...]
> Boot log from the serial console is attached.

The weird thing in this log is:

[    0.232233] .... node  #0, CPUs:   #4
[    0.322042] x86: Booted up 1 node, 2 CPUs

We have 2 CPUs and they are apparently numbered 0 and 4?!

Maybe related to:

d49597fd3bc7 x86/cpu: Deal with broken firmware (VMWare/XEN)
(which went into 4.9)
9d85eb9119f4 x86/smpboot: Make logical package management more robust
(which went into 4.9.2)

Ben.

-- 
Ben Hutchings
Make three consecutive correct guesses and you will be considered an
expert.

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Bug#861746: linux-image-4.9.0-2-amd64: Infinity `soft lockup` at kernel 4.9.0-1+ on HP ProLiant DL360G5 Ben Hutchings <ben@decadent.org.uk> - 2017-09-25 00:40 +0200

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