[4.12-rc1 regression] failed to boot host on 4.12-rc1 kernel due to acpi code change

[4.12-rc1 regression] failed to boot host on 4.12-rc1 kernel due to acpi code change

[Eryu Guan]

[-- Attachment #1: Type: text/plain, Size: 2036 bytes --]

Hi all,

I have one HP test host that failed to boot starting from 4.12-rc1, it
failed to bring up lvm device then dropped me to emergency shell.

...
[  OK  ] Started LVM2 PV scan on device 8:1.
[ TIME ] Timed out waiting for device dev-mapper-systemvg\x2dhome.device.
[DEPEND] Dependency failed for /root/workspace.
[DEPEND] Dependency failed for Local File Systems.
[DEPEND] Dependency failed for Mark the need to relabel after reboot.
[DEPEND] Dependency failed for Relabel all filesystems, if necessary.
[ TIME ] Timed out waiting for device dev-di...\x2d918a\x2d091a53637acd.device.
[DEPEND] Dependency failed for /boot.
...
Welcome to emergGive root password for maintenance
(or type Control-D to continue):

I attached full boot log.

I bisected this issue to this commit, and I've confirmed that host
booted successfully if I revert this commit on top of 4.12-rc3 kernel
(stock 4.12-rc3 kernel failed to boot too).

commit da28e1955d7fc228870f437693cfae8ce486ad9f
Author: Bob Moore <robert.moore@intel.com>
Date:   Wed Apr 26 16:17:43 2017 +0800

    ACPICA: Disassembler: Enhance resource descriptor detection

    ACPICA commit ba5020b2dbe1538e4ccd7ac2dfd8843a690c007f

    This change enhances the detection of resource descriptors
    within a buffer object. For the end_tag opcode, the second byte
    is defined to be either a checksum or zero. All known ASL compilers
    insert a zero for this byte. The disassembler now ensures this
    byte is zero before deciding that a buffer should be disassembled
    to a resource descriptor. This helps eliminate incorrect decisions
    when attempting to disassemble a buffer to a resource descriptor.

    Link: https://github.com/acpica/acpica/commit/ba5020b2
    Signed-off-by: Bob Moore <robert.moore@intel.com>
    Signed-off-by: Lv Zheng <lv.zheng@intel.com>
    Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>

I'm not familiar with ACPI, I'm not sure what information I should
provide, so please let me know if you need more info to debug.

Thanks,
Eryu

[-- Attachment #2: 4.12-rc3-boot.log.bz2 --]
[-- Type: application/x-bzip2, Size: 17539 bytes --]