linux-kernel - Re: [PATCH v8 11/12] zram: fix crashes with cpu hotplug multistate

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Message-ID: <YWk9e957Hb+I7HvR@T590>
Date:   Fri, 15 Oct 2021 16:36:11 +0800
From:   Ming Lei <ming.lei@...hat.com>
To:     Luis Chamberlain <mcgrof@...nel.org>
Cc:     tj@...nel.org, gregkh@...uxfoundation.org,
        akpm@...ux-foundation.org, minchan@...nel.org, jeyu@...nel.org,
        shuah@...nel.org, bvanassche@....org, dan.j.williams@...el.com,
        joe@...ches.com, tglx@...utronix.de, keescook@...omium.org,
        rostedt@...dmis.org, linux-spdx@...r.kernel.org,
        linux-doc@...r.kernel.org, linux-block@...r.kernel.org,
        linux-fsdevel@...r.kernel.org, linux-kselftest@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH v8 11/12] zram: fix crashes with cpu hotplug multistate

On Thu, Oct 14, 2021 at 05:22:40PM -0700, Luis Chamberlain wrote:
> On Fri, Oct 15, 2021 at 07:52:04AM +0800, Ming Lei wrote:
...
> > 
> > We need to understand the exact reason why there is still cpuhp node
> > left, can you share us the exact steps for reproducing the issue?
> > Otherwise we may have to trace and narrow down the reason.
> 
> See my commit log for my own fix for this issue.

OK, thanks!

I can reproduce the issue, and the reason is that reset_store fails
zram_remove() when unloading module, then the warning is caused.

The top 3 patches in the following tree can fix the issue:

https://github.com/ming1/linux/commits/my_v5.15-blk-dev


Thanks,
Ming