Regression in 4.7-rc7

Regression in 4.7-rc7

[Jens Axboe]

Hi,

Updated the laptop to -rc7 this morning, and it fails to boot. After 
bisecting it, this is the culprit:

commit 45209046c47b93fadf26dc59a9da724f387b9cf2
Author: Lv Zheng <lv.zheng@intel.com>
Date:   Tue Jul 5 13:53:12 2016 +0800

     ACPICA: Namespace: Fix namespace/interpreter lock ordering

     There is a lock order issue in acpi_load_tables(). The namespace lock
     is held before holding the interpreter lock.

The last I see is grub loading initramfs, after that nothing. Very 
reproducible. Laptop is a Dell XPS 13.

-- 
Jens Axboe

RE: Regression in 4.7-rc7

[Zheng, Lv]

We will revert 3 commits to fix this issue.
And re-enable the reverted feature in the future when it is safe to re-enable it.
See this bug for reference:
https://bugzilla.kernel.org/show_bug.cgi?id=121701

Thanks and best regards
-Lv

> From: Jens Axboe [mailto:axboe@kernel.dk]
> Subject: Regression in 4.7-rc7
> 
> Hi,
> 
> Updated the laptop to -rc7 this morning, and it fails to boot. After
> bisecting it, this is the culprit:
> 
> commit 45209046c47b93fadf26dc59a9da724f387b9cf2
> Author: Lv Zheng <lv.zheng@intel.com>
> Date:   Tue Jul 5 13:53:12 2016 +0800
> 
>      ACPICA: Namespace: Fix namespace/interpreter lock ordering
> 
>      There is a lock order issue in acpi_load_tables(). The namespace lock
>      is held before holding the interpreter lock.
> 
> The last I see is grub loading initramfs, after that nothing. Very
> reproducible. Laptop is a Dell XPS 13.
> 
> --
> Jens Axboe