Re: [sparc64] fails to boot, (was: Re: [PATCH memcg v6] net: set proper memcg for net_init hooks allocations) #forregzbot

[Thorsten Leemhuis <regressions@leemhuis.info>]

TWIMC: this mail is primarily send for documentation purposes and for
regzbot, my Linux kernel regression tracking bot. These mails usually
contain '#forregzbot' in the subject, to make them easy to spot and filter.

[TLDR: I'm adding this regression report to the list of tracked
regressions; all text from me you find below is based on a few templates
paragraphs you might have encountered already already in similar form.]

Hi, this is your Linux kernel regression tracker.

On 18.09.22 11:28, Anatoly Pugachev wrote:
> On Fri, Jun 03, 2022 at 07:19:43AM +0300, Vasily Averin wrote:
>> __register_pernet_operations() executes init hook of registered
>> pernet_operation structure in all existing net namespaces.
>>
>> Typically, these hooks are called by a process associated with
>> the specified net namespace, and all __GFP_ACCOUNT marked
>> allocation are accounted for corresponding container/memcg.
>>
>> However __register_pernet_operations() calls the hooks in the same
>> context, and as a result all marked allocations are accounted
>> to one memcg for all processed net namespaces.
>>
>> This patch adjusts active memcg for each net namespace and helps
>> to account memory allocated inside ops_init() into the proper memcg.
>>
>> Signed-off-by: Vasily Averin <vvs@openvz.org>
>> Acked-by: Roman Gushchin <roman.gushchin@linux.dev>
>> Acked-by: Shakeel Butt <shakeelb@google.com>
>> ---
>> v6: re-based to current upstream (v5.18-11267-gb00ed48bb0a7)
> 
> 
> Hello!
> 
> I'm unable to boot my sparc64 VM anymore (5.19 still boots, 6.0-rc1 does not),
> bisected up to this patch,
> 
> mator@ttip:~/linux-2.6$ git bisect bad
> 1d0403d20f6c281cb3d14c5f1db5317caeec48e9 is the first bad commit
> commit 1d0403d20f6c281cb3d14c5f1db5317caeec48e9
> Author: Vasily Averin <vvs@openvz.org>
> Date:   Fri Jun 3 07:19:43 2022 +0300

Thanks for the report. To be sure below issue doesn't fall through the
cracks unnoticed, I'm adding it to regzbot, my Linux kernel regression
tracking bot:

#regzbot ^introduced 1d0403d20f6c281cb3d14c5f1db5317caeec48e9
#regzbot title cgroups/sparc64: sparc64 fails to boot
#regzbot ignore-activity

This isn't a regression? This issue or a fix for it are already
discussed somewhere else? It was fixed already? You want to clarify when
the regression started to happen? Or point out I got the title or
something else totally wrong? Then just reply -- ideally with also
telling regzbot about it, as explained here:
https://linux-regtracking.leemhuis.info/tracked-regression/

Reminder for developers: When fixing the issue, add 'Link:' tags
pointing to the report (the mail this one replies to), as explained for
in the Linux kernel's documentation; above webpage explains why this is
important for tracked regressions.


Ciao, Thorsten (wearing his 'the Linux kernel's regression tracker' hat)

P.S.: As the Linux kernel's regression tracker I deal with a lot of
reports and sometimes miss something important when writing mails like
this. If that's the case here, don't hesitate to tell me in a public
reply, it's in everyone's interest to set the public record straight.