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[Dell XPS 13 9343] Random kernel Oops at boot with "acpi=ht", disappearing with "acpi=off"

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Hi,
This laptop suffers of random kernel hangs at boot: I tested kernel 4.1.8, 
4.2.1 and 4.3-rc3 and they are all affected.
Every time I turn on my laptop I have to boot several times to be able to 
reach the sddm login because often I get hangs which prevent the system to 
boot. Once booted I don't have any problem anymore, until the next boot.

With "acpi=off" the system boots flawlessly, while with "acpi=ht" I still 
get random hangs, so I guess the problem is in the ACPI table parsing code 
itself, or perhaps the SMP code.

I recompiled kernel 4.3-rc3 with CONFIG_ACPI_DEBUG=y and I attached full 
log from a serial console, booting with "debug acpi.debug_level=0x2003" 
(warn, error and tables debug enabled): 
https://bugzilla.kernel.org/attachment.cgi?id=189041

Distro is Arch Linux. Please let me know if you need further logs.

Bugzilla: https://bugzilla.kernel.org/show_bug.cgi?id=105251

Niccolò Belli
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[Dell XPS 13 9343] Random kernel Oops at boot with "acpi=ht", disappearing with "acpi=off" Niccolò Belli <niccolo.belli@linuxsystems.it> - 2015-10-02 12:10 +0200
  Re: [Dell XPS 13 9343] Random kernel Oops at boot with "acpi=ht",  disappearing with "acpi=off" Mika Westerberg <mika.westerberg@linux.intel.com> - 2015-10-02 12:20 +0200
    Re: [Dell XPS 13 9343] Random kernel Oops at boot with "acpi=ht", disappearing with "acpi=off" Niccolò Belli <niccolo.belli@linuxsystems.it> - 2015-10-03 12:20 +0200
      Re: [Dell XPS 13 9343] Random kernel Oops at boot with "acpi=ht",  disappearing with "acpi=off" Mika Westerberg <mika.westerberg@linux.intel.com> - 2015-10-05 12:50 +0200
        Re: [Dell XPS 13 9343] Random kernel Oops at boot with "acpi=ht", disappearing with "acpi=off" Niccolò Belli <niccolo.belli@linuxsystems.it> - 2015-10-05 15:50 +0200
          Re: [Dell XPS 13 9343] Random kernel Oops at boot with "acpi=ht",  disappearing with "acpi=off" Mika Westerberg <mika.westerberg@linux.intel.com> - 2015-10-05 16:00 +0200
            Re: [Dell XPS 13 9343] Random kernel Oops at boot with "acpi=ht", disappearing with "acpi=off" Niccolò Belli <niccolo.belli@linuxsystems.it> - 2015-10-05 18:00 +0200

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