linux-kernel - Re: Linux v3.11 and v3.12 bugs

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Message-ID: <CAO6TR8VsG+x87wbekVW7A_HNoV8VVrkbFQeZaScurysVP=PHDw@mail.gmail.com>
Date:	Sun, 13 Dec 2015 13:58:21 -0700
From:	Jeff Merkey <linux.mdb@...il.com>
To:	gregkh@...uxfoundation.org, LKML <linux-kernel@...r.kernel.org>
Subject: Re: Linux v3.11 and v3.12 bugs - history question

I found it.  Added to the patches -- fixed.  Different incarnation of
the bug in 3.12 vs. 3.11 -- same bug though ...



On 12/13/15, Jeff Merkey <linux.mdb@...il.com> wrote:
> Hi Greg,
>
> I think I found it.  Going back through all the commits on
> linux-stable.  I love this git thing, it's totally fucking cool.  What
> a great idea, it's such a time and labor saving tool, it only took me
> ten years to start using it.
>
> Jeff
>
>
> On 12/13/15, Jeff Merkey <linux.mdb@...il.com> wrote:
>> Hi Greg,
>>
>> You might know the answer to this and save me days of running down
>> bugs in old kernels.
>>
>> I am completing full regression testing of the mdb debugger on all
>> linux versions back to 2.6.37 and I am am almost done.  I've
>> encountered some nasty bugs in these two linux release lines.  These
>> bugs are documented all over the web about these versions.
>>
>> https://forum.blackmagicdesign.com/viewtopic.php?f=12&t=37186
>> https://bugzilla.redhat.com/show_bug.cgi?id=990955
>> https://lkml.org/lkml/2013/8/12/31
>>
>> I would like to put a fix into my patches for them to make them stable
>> enough to use.  The bug is:
>>
>> BUG: scheduling while atomic: swapper/0/0/0x10000100
>>
>> across several functions which shows up when I have held the
>> processsors in the debugger for several minutes but only if I take a
>> breakpoint AT INTERRUPT.  It does not show up otherwise.    It shows
>> up when I exit the debugger on either v3.11 or v3.12.
>>
>> I've tracked it down to a linux bug, and it does not affect any other
>> versions.
>>
>> Do you recall what caused this bug (I have seen comments its in
>> several drivers) and point me to the commit that fixed it or thread
>> because as near as I can tell, it affects these versions ONLY.  I have
>> seen the "BUG scheduling while atomic" fire off on other functions on
>> these versions but only on these two releases.
>>
>> Any help would be appreciated.
>>
>
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