linux-kernel - Re: Query regarding deadlock involving cgroup_threadgroup_rwsem and cpu_hotplug

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Date:   Fri, 12 Aug 2022 15:57:00 +0530
From:   Mukesh Ojha <quic_mojha@...cinc.com>
To:     Tejun Heo <tj@...nel.org>
CC:     Imran Khan <imran.f.khan@...cle.com>, <lizefan.x@...edance.com>,
        <hannes@...xchg.org>, <tglx@...utronix.de>, <steven.price@....com>,
        <peterz@...radead.org>, <cgroups@...r.kernel.org>,
        <linux-kernel@...r.kernel.org>
Subject: Re: Query regarding deadlock involving cgroup_threadgroup_rwsem and
 cpu_hotplug_lock

Hi Tejun,


On 7/28/2022 1:03 AM, Tejun Heo wrote:
> On Wed, Jul 20, 2022 at 08:05:03AM -1000, Tejun Heo wrote:
>> On Wed, Jul 20, 2022 at 05:31:51PM +0530, Mukesh Ojha wrote:
>>> Looks like these patches are the fixes.
>>>
>>> https://lore.kernel.org/all/YtDvN0wJ6CKaEPN8@slm.duckdns.org/#r
>>>
>>> Would let Tejun confirm this .
>>
>> Yeah, looks like the same issue. I'll write up a patch later this week /
>> early next unless someone beats me to it.
> 
> https://lore.kernel.org/lkml/20220705123705.764-1-xuewen.yan@unisoc.com/ is
> the thread with the same issue. Let's follow up there.

Since, i am not part of the above thread, is the reason i am commenting 
here.

The original patch of yours [1]  and the revert of [2] is fixing the 
issue and it is also confirmed here [3].
Can we get proper fix merge on your tree?

[1] https://lore.kernel.org/lkml/YuGbYCfAG81mZBnN@slm.duckdns.org/

[2] 
https://lore.kernel.org/all/20220121101210.84926-1-zhangqiao22@huawei.com/

[3] 
https://lore.kernel.org/lkml/CAB8ipk-72V-bYRfL-VcSRSyXTeQqkBVj+1d5MHSVV5CTar9a0Q@mail.gmail.com/

-Mukesh

> 
> Thanks.
>