linux-kernel - Re: [Regression] Re: Linux 5.0.2

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Date:   Thu, 14 Mar 2019 22:16:01 +0000
From:   alan@...ie.me.uk (Alan J. Wylie)
To:     Greg KH <gregkh@...uxfoundation.org>
Cc:     Alec Ari <neotheuser@...il.com>, linux-kernel@...r.kernel.org,
        stable@...r.kernel.org,
        Linus Torvalds <torvalds@...ux-foundation.org>
Subject: Re: [Regression] Re: Linux 5.0.2

Greg KH <gregkh@...uxfoundation.org> writes:

> On Thu, Mar 14, 2019 at 02:52:50PM -0700, Greg KH wrote:
>> On Thu, Mar 14, 2019 at 08:43:14PM +0000, Alan J. Wylie wrote:
>> > 
>> > (Adding Linus, since his tree is also broken)
>> 
>> Again, can you try running 'git bisect' to find the offending commit?
>
> Ah, looks like Guenter found it, nevermind...

I'd just finished bisecting:

$ git bisect good
3ad8e57560d7652a66da12b41c668a593509f3ad is the first bad commit
commit 3ad8e57560d7652a66da12b41c668a593509f3ad
Author: Peter Zijlstra (Intel) <peterz@...radead.org>
Date:   Tue Mar 5 22:23:15 2019 +0100

    perf/x86/intel: Make cpuc allocations consistent
    
    The cpuc data structure allocation is different between fake and real
    cpuc's; use the same code to init/free both.
    
    Signed-off-by: Peter Zijlstra (Intel) <peterz@...radead.org>
    Signed-off-by: Thomas Gleixner <tglx@...utronix.de>
    Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>

:040000 040000 9066c98aacccc5c85a5783907a8431fe3ab7004c 139f04cab3ddd303ffc595e848d01fac3989ac75 M      arch
$ git bisect log
git bisect start
# good: [283506fcd65de1bc10fcc6e2ca633a7b63171ffa] Linux 5.0.1
git bisect good 283506fcd65de1bc10fcc6e2ca633a7b63171ffa
# bad: [9e6fdea016e45c5feab60589241e0d3607d39945] Linux 5.0.2
git bisect bad 9e6fdea016e45c5feab60589241e0d3607d39945
# good: [e3f5c3cbe16356cd98518765d891aec90dc34e3d] drm: disable uncached DMA optimization for ARM and arm64
git bisect good e3f5c3cbe16356cd98518765d891aec90dc34e3d
# good: [e7b0b71c22e7f9529ae677ba7299efbe6bfbb232] staging: erofs: compressed_pages should not be accessed again after freed
git bisect good e7b0b71c22e7f9529ae677ba7299efbe6bfbb232
# bad: [3ad8e57560d7652a66da12b41c668a593509f3ad] perf/x86/intel: Make cpuc allocations consistent
git bisect bad 3ad8e57560d7652a66da12b41c668a593509f3ad
# good: [3dfe7538f80acf0edf33ae4ae4f639c86e3a3be5] ath9k: Avoid OF no-EEPROM quirks without qca,no-eeprom
git bisect good 3dfe7538f80acf0edf33ae4ae4f639c86e3a3be5
# first bad commit: [3ad8e57560d7652a66da12b41c668a593509f3ad] perf/x86/intel: Make cpuc allocations consistent
$ 

Regards
Alan

-- 
Alan J. Wylie                                          https://www.wylie.me.uk/

Dance like no-one's watching. / Encrypt like everyone is.
Security is inversely proportional to convenience