Bug#917569: linux-image-4.19.0-1-686: fails to boot on i386 (Soekris net5501) BUG at arch/x86/mm/pat.c:549

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Bug#917569: linux-image-4.19.0-1-686: fails to boot on i386 (Soekris net5501) BUG at arch/x86/mm/pat.c:549

Francesco Poli (wintermute)
Package: src:linux
Version: 4.19.12-1
Severity: important

Hi!

After upgrading an i386 box (Soekris net5501) running testing (buster),
I found out that the newly migrated Linux kernel fails to boot.

Looking at the boot through the serial console reveals the attached
output, in which I spotted the following line:

  [    5.363599] kernel BUG at arch/x86/mm/pat.c:549!

The previous kernel image (4.18.20-2) works with no issues.
I have temporarily altered GRUB_DEFAULT in /etc/default/grub, in order to
force the box to automatically boot that kernel version.

I hope this bug may be fixed soon.
Thanks a lot for any help you may provide!



-- System Information:
Debian Release: buster/sid
  APT prefers testing
  APT policy: (800, 'testing'), (500, 'unstable')
Architecture: i386 (i586)

Kernel: Linux 4.18.0-3-686 (SMP w/1 CPU core)
Locale: LANG=en_US.UTF-8, LC_CTYPE=en_US.UTF-8 (charmap=UTF-8), LANGUAGE=en_US:en (charmap=UTF-8)
Shell: /bin/sh linked to /bin/dash
Init: sysvinit (via /sbin/init)
LSM: AppArmor: enabled

bug_linux_Soekris-net5501_serial-console.out (3K) Download Attachment
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Bug#917569: linux-image-4.19.0-1-686: fails to boot on i386 (Soekris net5501) BUG at arch/x86/mm/pat.c:549

Salvatore Bonaccorso-4
Control: tags -1 + patch upstream

Hi Francesco,

On Fri, Dec 28, 2018 at 08:27:52PM +0100, Francesco Poli (wintermute) wrote:

> Package: src:linux
> Version: 4.19.12-1
> Severity: important
>
> Hi!
>
> After upgrading an i386 box (Soekris net5501) running testing (buster),
> I found out that the newly migrated Linux kernel fails to boot.
>
> Looking at the boot through the serial console reveals the attached
> output, in which I spotted the following line:
>
>   [    5.363599] kernel BUG at arch/x86/mm/pat.c:549!
The attached patch should fix the issue, and is pending for the
upcoming 4.19.13 stable version.

If you have a chance to verify this, with
https://kernel-team.pages.debian.net/kernel-handbook/ch-common-tasks.html#s4.2.2
that would be great.

Regards,
Salvatore

x86-mm-fix-decoy-address-handling-vs-32-bit-builds.patch (3K) Download Attachment
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Bug#917569: linux-image-4.19.0-1-686: fails to boot on i386 (Soekris net5501) BUG at arch/x86/mm/pat.c:549

Francesco Poli (wintermute)
On Sat, 29 Dec 2018 10:33:19 +0100 Salvatore Bonaccorso wrote:

[...]
> Hi Francesco,

Hello Salvatore,
thanks a lot for your prompt reply!

>
> On Fri, Dec 28, 2018 at 08:27:52PM +0100, Francesco Poli (wintermute) wrote:
[...]
> >   [    5.363599] kernel BUG at arch/x86/mm/pat.c:549!
>
> The attached patch should fix the issue, and is pending for the
> upcoming 4.19.13 stable version.

Good, that's a relief.

>
> If you have a chance to verify this, with
> https://kernel-team.pages.debian.net/kernel-handbook/ch-common-tasks.html#s4.2.2
> that would be great.

Unfortunately I have very limited Internet bandwidth in these days and
the only i386 box available (the Soekris net5501 itself) has too limited
hardware resources to conveniently rebuild a patched Linux kernel...

I am afraid I'll have to wait for the patched kernel image to enter
Debian unstable, in order to check whether the patch actually fixes the
issue. Sorry about that.


Bye and thanks again!

--
 http://www.inventati.org/frx/
 There's not a second to spare! To the laboratory!
..................................................... Francesco Poli .
 GnuPG key fpr == CA01 1147 9CD2 EFDF FB82  3925 3E1C 27E1 1F69 BFFE

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Bug#917569: linux-image-4.19.0-1-686: fails to boot on i386 (Soekris net5501) BUG at arch/x86/mm/pat.c:549

Salvatore Bonaccorso-4
Control: tags -1 + pending

Hi Francesco,

On Sat, Dec 29, 2018 at 12:32:14PM +0100, Francesco Poli wrote:

> On Sat, 29 Dec 2018 10:33:19 +0100 Salvatore Bonaccorso wrote:
>
> [...]
> > Hi Francesco,
>
> Hello Salvatore,
> thanks a lot for your prompt reply!
>
> >
> > On Fri, Dec 28, 2018 at 08:27:52PM +0100, Francesco Poli (wintermute) wrote:
> [...]
> > >   [    5.363599] kernel BUG at arch/x86/mm/pat.c:549!
> >
> > The attached patch should fix the issue, and is pending for the
> > upcoming 4.19.13 stable version.
>
> Good, that's a relief.
>
> >
> > If you have a chance to verify this, with
> > https://kernel-team.pages.debian.net/kernel-handbook/ch-common-tasks.html#s4.2.2
> > that would be great.
>
> Unfortunately I have very limited Internet bandwidth in these days and
> the only i386 box available (the Soekris net5501 itself) has too limited
> hardware resources to conveniently rebuild a patched Linux kernel...
>
> I am afraid I'll have to wait for the patched kernel image to enter
> Debian unstable, in order to check whether the patch actually fixes the
> issue. Sorry about that.

yes makes sense, was just in case you can do it. 4.19.13 upstream was
just released. So we will import that one directly and preapre towards
a furthre sid update.

Regards,
Salvatore

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Bug#917569: linux-image-4.19.0-1-686: fails to boot on i386 (Soekris net5501) BUG at arch/x86/mm/pat.c:549

Francesco Poli (wintermute)
On Sat, 29 Dec 2018 14:28:12 +0100 Salvatore Bonaccorso wrote:

[...]
> On Sat, Dec 29, 2018 at 12:32:14PM +0100, Francesco Poli wrote:
[...]
> > I am afraid I'll have to wait for the patched kernel image to enter
> > Debian unstable, in order to check whether the patch actually fixes the
> > issue. Sorry about that.
>
> yes makes sense, was just in case you can do it. 4.19.13 upstream was
> just released. So we will import that one directly and preapre towards
> a furthre sid update.

Sounds great: thank you so much!


--
 http://www.inventati.org/frx/
 There's not a second to spare! To the laboratory!
..................................................... Francesco Poli .
 GnuPG key fpr == CA01 1147 9CD2 EFDF FB82  3925 3E1C 27E1 1F69 BFFE

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Bug#917569: linux-image-4.19.0-1-686: fails to boot on i386 (Soekris net5501) BUG at arch/x86/mm/pat.c:549

Francesco Poli (wintermute)
On Sun, 30 Dec 2018 09:31:52 +0100 Francesco Poli wrote:

> On Sat, 29 Dec 2018 14:28:12 +0100 Salvatore Bonaccorso wrote:
[...]
> > 4.19.13 upstream was
> > just released. So we will import that one directly and preapre towards
> > a furthre sid update.
>
> Sounds great: thank you so much!

I've just installed linux-image-4.19.0-1-686/4.19.13-1 from unstable
and tried to reboot.
It works like a charm!

Thanks a lot for your really prompt and helpful reaction to my bug
report.
Bye!

--
 http://www.inventati.org/frx/
 There's not a second to spare! To the laboratory!
..................................................... Francesco Poli .
 GnuPG key fpr == CA01 1147 9CD2 EFDF FB82  3925 3E1C 27E1 1F69 BFFE

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Bug#917569: linux-image-4.19.0-1-686: fails to boot on i386 (Soekris net5501) BUG at arch/x86/mm/pat.c:549

Salvatore Bonaccorso-4
Hi Francesco,

On Mon, Dec 31, 2018 at 11:04:28AM +0100, Francesco Poli wrote:

> On Sun, 30 Dec 2018 09:31:52 +0100 Francesco Poli wrote:
>
> > On Sat, 29 Dec 2018 14:28:12 +0100 Salvatore Bonaccorso wrote:
> [...]
> > > 4.19.13 upstream was
> > > just released. So we will import that one directly and preapre towards
> > > a furthre sid update.
> >
> > Sounds great: thank you so much!
>
> I've just installed linux-image-4.19.0-1-686/4.19.13-1 from unstable
> and tried to reboot.
> It works like a charm!
>
> Thanks a lot for your really prompt and helpful reaction to my bug
> report.
> Bye!

Thanks a lot for your feedback!

Regards,
Salvatore