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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

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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

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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)" <invernomuto@paranoici.org> - 2018-12-28 20:40 +0100
  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 <carnil@debian.org> - 2018-12-29 10:40 +0100
    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 <invernomuto@paranoici.org> - 2018-12-29 12:40 +0100
      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 <carnil@debian.org> - 2018-12-29 14:40 +0100
        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 <invernomuto@paranoici.org> - 2018-12-30 09:40 +0100
          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 <invernomuto@paranoici.org> - 2018-12-31 11:10 +0100
            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 <carnil@debian.org> - 2018-12-31 11:40 +0100

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