Re: makedumpfile-1.5.9: Introduce parallel compression processing.

[Louis Bouchard <louis.bouchard@canonical.com>]

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Hello Kumagai-san,

Le 19/11/2015 08:30, Atsushi Kumagai a écrit :
> Hello Louis,
> 
>>>>> o Support new kernels - The supported kernel is updated to 4.1 in
>>>>> this version. At first I'm going to extend the supported version to
>>>>> 4.2, but I found an issue that makedumpfile seems to exclude
>>>>> necessary pages by mistake on linux 4.2. When crash-7.1.3 reads
>>>>> that filtered dump file, the following message is shown.
>>>>> 
>>>>> crash: page excluded: kernel virtual address: f3fe0000  type:
>>>>> "fill_task_struct"
>>>>> 
>>>>> This will be fixed in the next version.
>>>> 
>>>> Have you fixed the 4.2 kernel issue already or you intend to work on
>>>> it in the future ?
>>> 
>>> I haven't done anything yet, I was going to work from now.
>>> 
>>>> Both Debian and Ubuntu run 4.2 kernel so if waiting for a fix is
>>>> acceptable I would rather bring in a 1.5.9 + patch version.
>>> 
>>> So it will be helpful if you can do it.
>>> 
>>> 
>>> Thanks, Atsushi Kumagai
>>> 
>> 
>> That is perfect.  Just let me know once you have identified a fix and I
>> will include it in the new package.
> 
> I confirmed that there is no problem in makedumpfile, so you don't need to 
> update your makedumpfile packages.
> 
> That was a crash side issue and the problem is still under discussion. The
> warning I reported first is going to be solved in the next crash version, 
> but "struct" and "task" commands with task_struct (or some corresponding
> fields) can fail if a dumpfile of linux 4.2 is filtered.
> 
> You should see this thread for more details:
> 
> https://www.redhat.com/archives/crash-utility/2015-November/msg00021.html
> 
> 
> Thanks, Atsushi Kumagai
> 

As I understand it, 1.5.9 will work fine on 4.2 kernels.  But as the released
source stand, 1.5.9 only supports up to 4.1.  Should I simply go ahead and
"manually" add support statement for 4.2 (in README & makedumpfile.h) or you
prefer to change it in your git tree ?

Kind regards,

...Louis

- -- 
Louis Bouchard
Software engineer, Cloud & Sustaining eng.
Canonical Ltd
Ubuntu developer                       Debian Maintainer
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