Bug#928340: Linux 4.9.0-9-686: Boot hangs on Geode LX.

From	Ben Hutchings <ben@decadent.org.uk>
Newsgroups	linux.debian.bugs.dist, linux.debian.kernel
Subject	Bug#928340: Linux 4.9.0-9-686: Boot hangs on Geode LX.
Date	2019-05-02 16:40 +0200
Message-ID	<xTl2p-2JR-1@gated-at.bofh.it> (permalink)
References	<xTjtD-1GZ-1@gated-at.bofh.it> <xTjtD-1GZ-1@gated-at.bofh.it>
Organization	linux.* mail to news gateway

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On Thu, 2019-05-02 at 14:44 +0200, Björn Persson wrote:
> Package: src:linux
> Version: 4.9.168-1
> Severity: critical
> File: /boot/vmlinuz-4.9.0-9-686
> Justification: breaks the whole system
> 
> Dear Maintainer,
> 
> Debian 9 fails to boot on a Soekris net5501 with a Geode LX processor.
> Debian 8 worked fine. Running Debian 9 on Linux 3.16.0-8-586 from Debian
> 8 works. (That's what I'm running Reportbug on.) Linux 4.9.0-7-686,
> 4.9.0-8-686 and 4.9.0-9-686 appear to hang early in the boot process.
> The disk activity light remains lit when the system hangs. I'm attaching
> a boot log acquired over a serial console.
> 
> I'm reporting this against the kernel because replacing only the kernel
> works around the problem, but it looks like SystemD has been started
> when the hang occurs, so I suppose a userspace issue can't be completely
> ruled out.
> 
> Given that a kernel compiled for i586 works and one compiled for i686
> does not, one might suspect that the processor isn't i686-compatible.
> This seems to be rather unclear. According to the release notes this
> processor should still be supported. It has all of the flags that this
> script tests for:
> https://www.debian.org/releases/stretch/i386/release-notes/ch-information#i386-is-now-almost-i686
[...]

The Geode LX's CPUID has family=5 (586), but I agree with your
understanding that it has all the important features of a 686 and
should still be supported.  In fact, I've specifically enabled
continued support for it in the current (buster/sid) 686 kernel
configuration.

I'm afraid I don't have any immediate ideas for how to fix or debug
this.

Ben.

-- 
Ben Hutchings
It is easier to write an incorrect program
than to understand a correct one.

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Bug#928340: Linux 4.9.0-9-686: Boot hangs on Geode LX. Björn Persson <Bjorn@xn--rombobjrn-67a.se> - 2019-05-02 15:00 +0200
  Bug#928340: Linux 4.9.0-9-686: Boot hangs on Geode LX. Ben Hutchings <ben@decadent.org.uk> - 2019-05-02 16:40 +0200

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