linux-kernel - Re: Memory hotplug softlock issue

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Message-ID: <20181120141221.GA7386@MiWiFi-R3L-srv>
Date:   Tue, 20 Nov 2018 22:12:21 +0800
From:   Baoquan He <bhe@...hat.com>
To:     Michal Hocko <mhocko@...nel.org>
Cc:     Hugh Dickins <hughd@...gle.com>, Vlastimil Babka <vbabka@...e.cz>,
        pifang@...hat.com, David Hildenbrand <david@...hat.com>,
        linux-mm@...ck.org, linux-kernel@...r.kernel.org,
        akpm@...ux-foundation.org, aarcange@...hat.com,
        Mel Gorman <mgorman@...e.de>
Subject: Re: Memory hotplug softlock issue

On 11/20/18 at 03:05pm, Michal Hocko wrote:
> > Yes, I applied Hugh's patch 8 hours ago, then our QE Ping operated on
> > that machine, after many times of hot removing/adding, the endless
> > looping during mirgrating is not seen any more. The test result for
> > Hugh's patch is positive. I even suggested Ping increasing the memory
> > pressure to "stress -m 250", it still succeeded to offline and remove.
> > 
> > So I think this patch works to solve the issue. Thanks a lot for your
> > help, all of you. 
> 
> This is a great news! Thanks for your swift feedback. I will go and try
> to review Hugh's patch soon.

Yeah. Thanks a lot for your help on debugging and narrowing down
to position the cause of the issue, Michal, really appreciated!

> > Meanwhile we found sometime onlining page may not add back all memory
> > blocks on one memory board, then hot removing/adding them will cause
> > kernel panic. I will investigate further and collect information, see if
> > it's a kernel issue or udev issue.
> 
> It would be great to get a report in a new email thread.

Sure, will do after reproducing and inforamtion arranging.

Thanks
Baoquan